FINAL TEST AT LABORATORY
Study of the diffusion in gaseous state and molecular speeds

1. We may say the followings:
   1. the molecules have speeds in all gaseous, liquid and solid states;
   2. the molecules have energy only in gaseous and liquid states;
   3. the kinetic energy of a molecule is affected by temperature and pressure;
   4. diffusion process appears only in gaseous state;
   
   
2. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all have same energy;
   2. all are moving in an arbitrary direction;
   3. all have same speed;
   4. are considered to be at the same temperature, but may have different energies;
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the virtual speeds and not the real speeds of each involved species;
   2. the real speeds and not the virtual speeds of each involved species;
   3. the average energy or average speed of each involved species;
   4. the propagation of the species as neutral molecules and not as ions;
   
   
4. The fog observed during the experiment is due to:
   1. our experiment designed to trap the product of the reaction;
   2. presence of the ammonia;
   3. presence of the chlorine;
   4. unproper illumination in the laboratory and our breathing;
   
   
5. The position of the ring in the experiment is dependent on:
   1. the propagation of the species as ions and not as neutral molecules;
   2. the virtual speeds and not the real speeds of each involved species;
   3. the concentrations of the solutions used;
   4. the length of the tube and the width of the tube;
   
   

TEST DE FINAL DE LABORATOR
Studiul difuziei in stare gazoasa si a vitezelor moleculare

1. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   2. moleculele au energie numai īn stare gazoasa si lichida;
   3. energia cinetica a unei molecule este afectata de temperatura si presiune;
   4. proces de difuzie apare numai īn stare gazoasa;
   
   
2. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate au aceeasi energie;
   2. toate se īndreapta īntr-o directie arbitrara;
   3. toate au aceeasi viteza;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   2. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   3. energia medie sau viteza medie a fiecarei specii implicate;
   4. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   
   
4. Ceata observata īn timpul experimentului se datoreaza:
   1. experimentului nostru proiectat pentru a captura produsul de reactie;
   2. prezentei amoniacului;
   3. prezentei clorului;
   4. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   5. formarea clorurii de amoniu;
   
   
5. Pozitia inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca ionii si nu ca si molecule neutre;
   2. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   3. concentratiile solutiilor utilizate;
   4. lungimea tubului si latimea tubului;
   5. viteza la moda sau energia la moda a fiecarei specii implicate;
   
   

FINAL TEST AT LABORATORY
Study of the diffusion in gaseous state and molecular speeds

1. The position of the ring in the experiment is dependent on:
   1. the propagation of the species as ions and not as neutral molecules;
   2. the length of the tube and not of the width of the tube;
   3. the width of the tube and not of the length of the tube;
   4. the speed of diffusion of each involved species;
   
   
2. The chronometer is used in the experiment for:
   1. extracting the information necessary to calculate the diffusion coefficients;
   2. indication of the moment when we should pay attention to the experiment;
   3. synchronization of the diffusion times;
   4. measuring of the diffusion time;
   
   
3. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. are considered to be at the same temperature, but may have different speeds;
   2. all have same energy;
   3. all are moving in the same direction;
   4. all are moving in an arbitrary direction;
   
   
4. The time to the formation of the ring in the experiment is dependent on:
   1. the length of the tube and not of the width of the tube;
   2. the virtual speeds and not the real speeds of each involved species;
   3. the speed of diffusion of each involved species;
   4. the length of the tube and the width of the tube;
   
   
5. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory and our breathing;
   2. presence of the chlorine;
   3. our experiment designed to trap the product of the reaction;
   4. unproper illumination in the laboratory or our breathing;
   
   

TEST DE FINAL DE LABORATOR
Studiul difuziei in stare gazoasa si a vitezelor moleculare

1. Pozitia inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca ionii si nu ca si molecule neutre;
   2. lungimea tubului si nu latimea tubului;
   3. latimea tubului si nu lungimea tubului;
   4. viteza de difuzie a fiecarei specii implicate;
   
   
2. Cronometrul este utilizat īn experimentul pentru:
   1. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   2. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   3. sincronizarea timpilor de difuzie;
   4. masurarea timpului de difuzie;
   
   
3. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   2. toate au aceeasi energie;
   3. toate se deplaseaza īn aceeasi directie;
   4. toate se īndreapta īntr-o directie arbitrara;
   
   
4. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. lungimea tubului si nu latimea tubului;
   2. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   3. viteza de difuzie a fiecarei specii implicate;
   4. lungimea tubului si latimea tubului;
   
   
5. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   2. prezentei clorului;
   3. experimentului nostru proiectat pentru a captura produsul de reactie;
   4. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   
   

FINAL TEST AT LABORATORY
Study of the diffusion in gaseous state and molecular speeds

1. We may say the followings:
   1. diffusion process appears in all gaseous, liquid and solid states;
   2. the molecules have energy only in gaseous and liquid states;
   3. the kinetic energy of a molecule is affected by temperature only;
   4. the molecules have speeds only in gaseous state;
   
   
2. At the ends of the tube following equilibrium reactions occurs:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. H⁺ + HO^- \=\ H₂O
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. NH₃ + HCl \=\ NH₄Cl
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the propagation of the species as ions and not as neutral molecules;
   2. the mode energy or mode speed of each involved species;
   3. the propagation of the species as neutral molecules and not as ions;
   4. the length of the tube and the width of the tube;
   
   
4. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all are moving in an arbitrary direction;
   2. are considered to be at the same temperature, but may have different speeds;
   3. all are moving in the same direction;
   4. are considered to be at the same temperature, but may have different energies;
   
   
5. The chronometer is used in the experiment for:
   1. indication of the moment when we should pay attention to the experiment;
   2. extracting the information necessary to calculate the diffusion coefficients;
   3. to keep us busy;
   4. synchronization of the diffusion times;
   
   

TEST DE FINAL DE LABORATOR
Studiul difuziei in stare gazoasa si a vitezelor moleculare

1. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   2. moleculele au energie numai īn stare gazoasa si lichida;
   3. energia cinetica a unei molecule este afectata de numai temperatura;
   4. moleculele au viteze numai īn stare gazoasa;
   5. moleculele au energie numai īn stare gazoasa;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. H⁺ + HO^- \=\ H₂O
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. NH₃ + HCl \=\ NH₄Cl
   5. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca ionii si nu ca si molecule neutre;
   2. viteza la moda sau energia la moda a fiecarei specii implicate;
   3. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   4. lungimea tubului si latimea tubului;
   
   
4. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate se īndreapta īntr-o directie arbitrara;
   2. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   3. toate se deplaseaza īn aceeasi directie;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   5. toate au aceeasi energie;
   
   
5. Cronometrul este utilizat īn experimentul pentru:
   1. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   2. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   3. sa ne tina ocupati;
   4. sincronizarea timpilor de difuzie;
   5. masurarea timpului de difuzie;
   
   

FINAL TEST AT LABORATORY
Study of the diffusion in gaseous state and molecular speeds

1. The position of the ring in the experiment is dependent on:
   1. the average energy or average speed of each involved species;
   2. the width of the tube and not of the length of the tube;
   3. the virtual speeds and not the real speeds of each involved species;
   4. the propagation of the species as ions and not as neutral molecules;
   
   
2. We may say the followings:
   1. the molecules have speeds only in gaseous and liquid states;
   2. diffusion process appears in all gaseous, liquid and solid states;
   3. diffusion process appears only in gaseous state;
   4. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   
   
3. The fog observed during the experiment is due to:
   1. presence of the chlorine;
   2. unproper illumination in the laboratory and our breathing;
   3. presence of the ammonia;
   4. formation of ammonium chloride;
   
   
4. The chronometer is used in the experiment for:
   1. synchronization of the diffusion times;
   2. indication of the moment when we should pay attention to the experiment;
   3. extracting the information necessary to calculate the speeds ratio;
   4. extracting the information necessary to calculate the diffusion coefficients;
   
   
5. At the ends of the tube following equilibrium reactions occurs:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. H⁺ + HO^- \=\ H₂O
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. NH₃ + HCl \=\ NH₄Cl
   
   

TEST DE FINAL DE LABORATOR
Studiul difuziei in stare gazoasa si a vitezelor moleculare

1. Pozitia inelului īn experimentul este dependenta de:
   1. energia medie sau viteza medie a fiecarei specii implicate;
   2. latimea tubului si nu lungimea tubului;
   3. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   4. propagarea speciilor ca ionii si nu ca si molecule neutre;
   5. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   
   
2. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au viteze numai īn stare gazoasa si lichida;
   2. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   3. proces de difuzie apare numai īn stare gazoasa;
   4. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   5. proces de difuzie apare numai īn stare gazoasa si lichida;
   
   
3. Ceata observata īn timpul experimentului se datoreaza:
   1. prezentei clorului;
   2. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   3. prezentei amoniacului;
   4. formarea clorurii de amoniu;
   5. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   
   
4. Cronometrul este utilizat īn experimentul pentru:
   1. sincronizarea timpilor de difuzie;
   2. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   3. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   4. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   
   
5. La capetele tubului urmatoarele reactii de echilibru apar:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. H⁺ + HO^- \=\ H₂O
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. NH₃ + HCl \=\ NH₄Cl
   5. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   

FINAL TEST AT LABORATORY
Study of the diffusion in gaseous state and molecular speeds

1. The chronometer is used in the experiment for:
   1. extracting the information necessary to calculate the diffusion coefficients;
   2. to keep us busy;
   3. indication of the moment when we should pay attention to the experiment;
   4. measuring of the diffusion time;
   
   
2. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all are moving in an arbitrary direction;
   2. are considered to be at the same temperature, but may have different speeds;
   3. all are moving in the same direction;
   4. all have same energy;
   
   
3. The position of the ring in the experiment is dependent on:
   1. the length of the tube and not of the width of the tube;
   2. the propagation of the species as neutral molecules and not as ions;
   3. the average energy or average speed of each involved species;
   4. the real speeds and not the virtual speeds of each involved species;
   
   
4. We may say the followings:
   1. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   2. the molecules have energy in all gaseous, liquid and solid states;
   3. diffusion process appears in all gaseous, liquid and solid states;
   4. diffusion process appears only in gaseous state;
   
   
5. The time to the formation of the ring in the experiment is dependent on:
   1. the real speeds and not the virtual speeds of each involved species;
   2. the speed of diffusion of each involved species;
   3. the length of the tube and the width of the tube;
   4. the virtual speeds and not the real speeds of each involved species;
   
   

TEST DE FINAL DE LABORATOR
Studiul difuziei in stare gazoasa si a vitezelor moleculare

1. Cronometrul este utilizat īn experimentul pentru:
   1. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   2. sa ne tina ocupati;
   3. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   4. masurarea timpului de difuzie;
   
   
2. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate se īndreapta īntr-o directie arbitrara;
   2. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   3. toate se deplaseaza īn aceeasi directie;
   4. toate au aceeasi energie;
   5. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   
   
3. Pozitia inelului īn experimentul este dependenta de:
   1. lungimea tubului si nu latimea tubului;
   2. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   3. energia medie sau viteza medie a fiecarei specii implicate;
   4. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   5. viteza la moda sau energia la moda a fiecarei specii implicate;
   
   
4. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   2. moleculele au energie īn toate starile gazoasa, lichida si solida;
   3. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   4. proces de difuzie apare numai īn stare gazoasa;
   
   
5. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   2. viteza de difuzie a fiecarei specii implicate;
   3. lungimea tubului si latimea tubului;
   4. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   5. propagarea speciilor ca ionii si nu ca si molecule neutre;
   
   

FINAL TEST AT LABORATORY
Obtaining of the oxygen: study of the gases laws

1. The values taken from the experiment conducted in the laboratory indicated that:
   1. the ideal model of a gas approximated the worst the behavior of the released gas;
   2. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   3. ozone were released as result of the decomposition;
   4. oxigen were released as result of the decomposition;
   
   
2. For gaseous state:
   1. the pressure is much lower than in liquid state;
   2. it exists an equation for all, p · V = n · R · T;
   3. the pressure is approximately the same as in liquid state;
   4. the pressure is subject to change when a chemical reaction occurs;
   
   
3. In the laboratory were studied:
   1. the producing of some gas as result of a lost of the mass of a solid;
   2. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   4. increasing of the pressure of a gas when was heated;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KNO₂ + O₂ -> KNO₃;
   2. Ag + O₂ -> Ag₂O;
   3. Ag₂O -> Ag + O₂;
   4. KCl + O₂ -> KClO₃;
   
   
5. A state equation for a real gas is:
   1. a relation between an unlimited number of state parameters;
   2. a relation which takes into account certain deviations from the ideal model;
   3. a relation which may involve some constants dependent of gas composition;
   4. a relation which is always true, independent of the values of the state parameters;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   2. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   3. ozonul au fost eliberat ca urmare a descompunerii;
   4. oxigenul au fost eliberat ca urmare a descompunerii;
   
   
2. Pentru stare gazoasa:
   1. presiunea este mult mai mica decāt īn stare lichida;
   2. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   3. presiunea este aproximativ aceeasi ca si īn stare lichida;
   4. presiunea se pot modifica atunci cānd apare o reactie chimica;
   5. presiunea este exact la fel ca si īn stare lichida;
   
   
3. Īn laborator s-au studiat:
   1. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   4. cresterea presiunii unui gaz cānd s-a īncalzit;
   5. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   
   
4. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KNO₂ + O₂ -> KNO₃;
   2. Ag + O₂ -> Ag₂O;
   3. Ag₂O -> Ag + O₂;
   4. KCl + O₂ -> KClO₃;
   5. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   
   
5. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un numar nelimitat de parametri de stare;
   2. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   3. o relatie care poate implica unele constante dependente de compozitia gazului;
   4. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   5. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   
   

FINAL TEST AT LABORATORY
Obtaining of the oxygen: study of the gases laws

1. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   2. we do not possess enough information to decide what gas was released from the reaction;
   3. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   4. the ideal model of a gas approximated the best the behavior of the released gas;
   
   
2. For gaseous state:
   1. the pressure depends on the model which are used to approximate it;
   2. the pressure is approximately the same as in liquid state;
   3. the pressure is unchanged when a chemical reaction occurs;
   4. the pressure is much lower than in liquid state;
   
   
3. A state equation for a real gas is:
   1. usable in the laboratory, but is not to be used somewhere else;
   2. a relation which is always true, independent of the values of the state parameters;
   3. a relation obtained after conducting of the experiment;
   4. a relation between an certain number of state parameters;
   
   
4. In the laboratory were studied:
   1. increasing of the temperature of a solid mass when was heated;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   3. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   4. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   
   
5. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. H₂O + O₂ -> H₂O₂;
   2. distillation of the liquid air;
   3. H₂O₂ -> H₂O + O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   5. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
2. Pentru stare gazoasa:
   1. presiunea depinde de modelul care este utilizat pentru o aproxima;
   2. presiunea este aproximativ aceeasi ca si īn stare lichida;
   3. presiunea este neschimbata cānd apare o reactie chimica;
   4. presiunea este mult mai mica decāt īn stare lichida;
   5. presiunea este mult mai mare decāt īn stare lichida;
   
   
3. O ecuatie de stare pentru un gaz real este:
   1. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   2. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   3. o relatie obtinut dupa efectuarea experimentului;
   4. o relatie īntre un anumit numar de parametri de stare;
   
   
4. Īn laborator s-au studiat:
   1. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   3. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   5. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   
   
5. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. H₂O + O₂ -> H₂O₂;
   2. distilarea aerului lichid;
   3. H₂O₂ -> H₂O + O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   

FINAL TEST AT LABORATORY
Obtaining of the oxygen: study of the gases laws

1. The values taken from the experiment conducted in the laboratory indicated that:
   1. the ideal model of a gas approximated the best the behavior of the released gas;
   2. we possess enough information to decide what gas was released from the reaction;
   3. the ideal model of a gas approximated the worst the behavior of the released gas;
   4. we do not possess enough information to decide what gas was released from the reaction;
   
   
2. In the laboratory were studied:
   1. the producing of some gas as result of a lost of the mass of a solid;
   2. the lost of the mass of a solid as result of producing of some gas;
   3. increasing of the temperature of a solid mass when was heated;
   4. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   2. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   3. H₂O₂ -> H₂O + O₂;
   4. KClO₃ -> KCl + O₂;
   
   
4. For gaseous state:
   1. the pressure is unchanged when a chemical reaction occurs;
   2. we need to take supplementary precautions in the laboratory;
   3. it exists an equation for all, p · V = n · R · T;
   4. the pressure is much lower than in liquid state;
   
   
5. A state equation for a real gas is:
   1. a relation between an unlimited number of state parameters;
   2. usable in the laboratory, but is not to be used somewhere else;
   3. a relation between an certain number of state parameters;
   4. a relation which is always true, independent of the values of the state parameters;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   2. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   4. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
2. Īn laborator s-au studiat:
   1. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   2. pierdut din masa de solid ca urmare a producerii unor gaze;
   3. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   4. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   5. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   2. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   3. H₂O₂ -> H₂O + O₂;
   4. KClO₃ -> KCl + O₂;
   
   
4. Pentru stare gazoasa:
   1. presiunea este neschimbata cānd apare o reactie chimica;
   2. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   3. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   4. presiunea este mult mai mica decāt īn stare lichida;
   5. presiunea depinde de modelul care este utilizat pentru o aproxima;
   
   
5. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un numar nelimitat de parametri de stare;
   2. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   3. o relatie īntre un anumit numar de parametri de stare;
   4. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   5. o relatie obtinut dupa efectuarea experimentului;
   
   

FINAL TEST AT LABORATORY
Obtaining of the oxygen: study of the gases laws

1. The values taken from the experiment conducted in the laboratory indicated that:
   1. we possess enough information to decide what gas was released from the reaction;
   2. ozone were released as result of the decomposition;
   3. we do not possess enough information to decide what gas was released from the reaction;
   4. the ideal model of a gas approximated the best the behavior of the released gas;
   
   
2. A state equation for a real gas is:
   1. a relation derived to approximate the relation between state parameters;
   2. a relation obtained after conducting of the experiment;
   3. a relation between an unlimited number of state parameters;
   4. a relation which may involve some constants dependent of gas composition;
   
   
3. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   2. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   4. the producing of some gas as result of a lost of the mass of a solid;
   
   
4. For gaseous state:
   1. the pressure is subject to change when a chemical reaction occurs;
   2. it exists an equation for all, p · V = n · R · T;
   3. the pressure is exactly the same as in liquid state;
   4. we need to take supplementary precautions in the laboratory;
   
   
5. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KCl + O₂ -> KClO₃;
   2. H₂O + O₂ -> H₂O₂;
   3. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   4. opening a bubble water bottle;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   2. ozonul au fost eliberat ca urmare a descompunerii;
   3. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   4. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   
   
2. O ecuatie de stare pentru un gaz real este:
   1. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   2. o relatie obtinut dupa efectuarea experimentului;
   3. o relatie īntre un numar nelimitat de parametri de stare;
   4. o relatie care poate implica unele constante dependente de compozitia gazului;
   
   
3. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   2. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   4. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   
   
4. Pentru stare gazoasa:
   1. presiunea se pot modifica atunci cānd apare o reactie chimica;
   2. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   3. presiunea este exact la fel ca si īn stare lichida;
   4. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   5. presiunea depinde de modelul care este utilizat pentru o aproxima;
   
   
5. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KCl + O₂ -> KClO₃;
   2. H₂O + O₂ -> H₂O₂;
   3. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   4. deschiderea unei sticle de apa cu bule;
   
   

FINAL TEST AT LABORATORY
Obtaining of the oxygen: study of the gases laws

1. A state equation for a real gas is:
   1. a relation derived to approximate the relation between state parameters;
   2. a relation between an certain number of state parameters;
   3. a relation which is always true, independent of the values of the state parameters;
   4. a relation which may involve some constants dependent of gas composition;
   
   
2. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   2. KNO₂ + O₂ -> KNO₃;
   3. Ag₂O -> Ag + O₂;
   4. KNO₃ -> KNO₂ + O₂;
   
   
3. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   2. we possess enough information to decide what gas was released from the reaction;
   3. ozone were released as result of the decomposition;
   4. we do not possess enough information to decide what gas was released from the reaction;
   
   
4. In the laboratory were studied:
   1. the lost of the mass of a solid as result of producing of some gas;
   2. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   3. increasing of the temperature of a solid mass when was heated;
   4. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   
   
5. For gaseous state:
   1. the pressure is exactly the same as in liquid state;
   2. we need to take supplementary precautions in the laboratory;
   3. the pressure is much lower than in liquid state;
   4. the pressure is unchanged when a chemical reaction occurs;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   2. o relatie īntre un anumit numar de parametri de stare;
   3. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   4. o relatie care poate implica unele constante dependente de compozitia gazului;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   2. KNO₂ + O₂ -> KNO₃;
   3. Ag₂O -> Ag + O₂;
   4. KNO₃ -> KNO₂ + O₂;
   5. KClO₃ -> KCl + O₂;
   
   
3. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. ozonul au fost eliberat ca urmare a descompunerii;
   4. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
4. Īn laborator s-au studiat:
   1. pierdut din masa de solid ca urmare a producerii unor gaze;
   2. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   3. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   4. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   5. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   
   
5. Pentru stare gazoasa:
   1. presiunea este exact la fel ca si īn stare lichida;
   2. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   3. presiunea este mult mai mica decāt īn stare lichida;
   4. presiunea este neschimbata cānd apare o reactie chimica;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When lead is identified:
   1. dangerous substances are used;
   2. a violet complex appears;
   3. precautions should be made for toxic wastes disposal;
   4. a heat release is observed;
   
   
2. The electric charges after passing the metals into solution may be:
   1. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   
3. Why moisten the paper with solution of sodium nitrate?
   1. to be cut easily with scissors;
   2. to have something to do in the laboratory;
   3. to accomodate ourselves to use chemicals;
   4. to provide cations for analysis;
   
   
4. The paper requires before analysis of the sample:
   1. to be moistened with an electrolyte;
   2. to be dry;
   3. to be cut in small pieces;
   4. to be acidified;
   
   
5. When aluminum is identified:
   1. the presence of other ions may produce a true negative outcome;
   2. supplementary precautions should be taken, because the plates are made from aluminum too;
   3. is identified as Al¹⁺ cation;
   4. is identified as Al²⁺ cation;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd plumbul este identificat:
   1. sunt utilizate substante periculoase;
   2. apare un complex violet;
   3. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   4. se observa o eliberare de caldura;
   
   
2. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   
3. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa fie taiat cu usurinta cu foarfeca;
   2. pentru a avea ceva de a face īn laborator;
   3. sa ne acomodam in a utiliza substante chimice;
   4. pentru furniza cationi pentru analiza;
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa fie umezita cu un electrolit;
   2. sa fie uscata;
   3. sa fie taiata īn bucati mici;
   4. sa fie acidulata;
   
   
5. Cānd aluminiu este identificat:
   1. prezenta altor ioni poate produce un rezultat adevarat negativ;
   2. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   3. este identificat ca cationul Al¹⁺;
   4. este identificat ca cationul Al²⁺;
   5. doar o reactie de identificare este posibila;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When the electrical circuit is closed:
   1. electric current avoids the sample and the paper;
   2. surface of the sample is fastly covered by a protecting shield of electrons;
   3. cations from the solution are passed into sample as metals;
   4. elements from the metals are passed into solution as anions;
   
   
2. The paper requires before analysis of the sample:
   1. to be cut in small pieces;
   2. to measure its surface;
   3. to be dry;
   4. to be burned;
   
   
3. When lead is identified:
   1. a blue complex appears;
   2. a violet complex appears;
   3. the reactions used clearly indicates its presence;
   4. a red-brown complex appears;
   
   
4. Why moisten the paper with solution of sodium nitrate?
   1. for stopping after a while the chemical reaction that takes place;
   2. to provide cations for analysis;
   3. to accomodate ourselves to use chemicals;
   4. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   
   
5. This method of analysis of metals and alloys is:
   1. a destructive method of analysis;
   2. too ancient to be used today in the laboratory;
   3. not useful for both metals and alloys;
   4. useful for alloys, not so useful for metals;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd circuitul electric este īnchis:
   1. curent electric evita proba si hārtia;
   2. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   3. cationii din solutie sunt trecuti īn proba ca metale;
   4. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   5. disocierea apei este inhibata;
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie taiata īn bucati mici;
   2. sa i se masoare suprafata;
   3. sa fie uscata;
   4. sa fie arsa;
   
   
3. Cānd plumbul este identificat:
   1. apare un complex albastru;
   2. apare un complex violet;
   3. reactiile utilizate īn mod clar ii indica prezenta;
   4. apare un complex rosu-brun;
   
   
4. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru oprirea dupa un timp reactiei chimice care are loc;
   2. pentru furniza cationi pentru analiza;
   3. sa ne acomodam in a utiliza substante chimice;
   4. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda distructiva de analiza;
   2. prea veche pentru a fi utilizata īn prezent īn laborator;
   3. nu este utila nici pentru metale nici pentru aliaje;
   4. utila pentru aliaje, nu atāt de utila pentru metale;
   5. o metoda gravimetrica de analiza;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   4. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   
2. The paper requires before analysis of the sample:
   1. to be moistened with an electrolyte;
   2. to be weighted;
   3. to be dry;
   4. to be cut in small pieces;
   
   
3. When the electrical circuit is closed:
   1. elements from the metals are passed into solution as cations;
   2. electric current passes the sample and the paper;
   3. electric current avoids the sample and the paper;
   4. anions from the solution are passed into sample as metals;
   
   
4. When lead is identified:
   1. a violet complex appears;
   2. interference of other ions may affect the outcome;
   3. a blue complex appears;
   4. a heat release is observed;
   
   
5. Why moisten the paper with solution of sodium nitrate?
   1. for stopping after a while the chemical reaction that takes place;
   2. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   3. for the paper to work as isolator;
   4. to be cut easily with scissors;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   4. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie umezita cu un electrolit;
   2. sa fie cantarita;
   3. sa fie uscata;
   4. sa fie taiata īn bucati mici;
   
   
3. Cānd circuitul electric este īnchis:
   1. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   2. curent electric trece prin proba si hārtie;
   3. curent electric evita proba si hārtia;
   4. anionii din solutie sunt trecuti īn proba ca metale;
   5. disocierea apei este inhibata;
   
   
4. Cānd plumbul este identificat:
   1. apare un complex violet;
   2. interferenta altor ioni poate afecta rezultatul;
   3. apare un complex albastru;
   4. se observa o eliberare de caldura;
   
   
5. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru oprirea dupa un timp reactiei chimice care are loc;
   2. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   3. pentru ca hartia sa actioneze ca izolator;
   4. sa fie taiat cu usurinta cu foarfeca;
   5. pentru furniza cationi pentru analiza;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The paper requires before analysis of the sample:
   1. to be moistened with an electrolyte;
   2. to be tested;
   3. to be cut in small pieces;
   4. to be dry;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. for the paper to work as isolator;
   2. to provide cations for analysis;
   3. for stopping after a while the chemical reaction that takes place;
   4. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   
   
3. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   4. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
4. When lead is identified:
   1. a violet complex appears;
   2. a red-brown complex appears;
   3. interference of other ions may affect the outcome;
   4. a yellow complex appears;
   
   
5. This method of analysis of metals and alloys is:
   1. useful for pure metals, not so useful for alloys;
   2. useful for both metals and alloys;
   3. too ancient to be used today in the laboratory;
   4. not useful for both metals and alloys;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Hartia necesita ca īnainte de analiza probei:
   1. sa fie umezita cu un electrolit;
   2. sa fie testata;
   3. sa fie taiata īn bucati mici;
   4. sa fie uscata;
   5. sa i se masoare suprafata;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru ca hartia sa actioneze ca izolator;
   2. pentru furniza cationi pentru analiza;
   3. pentru oprirea dupa un timp reactiei chimice care are loc;
   4. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   
   
3. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   4. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   5. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
4. Cānd plumbul este identificat:
   1. apare un complex violet;
   2. apare un complex rosu-brun;
   3. interferenta altor ioni poate afecta rezultatul;
   4. apare un complex galben;
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. utila pentru metale pure, nu atāt de utila pentru aliaje;
   2. utila atāt pentru metale si aliaje;
   3. prea veche pentru a fi utilizata īn prezent īn laborator;
   4. nu este utila nici pentru metale nici pentru aliaje;
   5. o metoda cantitativa de analiza;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The paper requires before analysis of the sample:
   1. to be tested;
   2. to be burned;
   3. to measure its surface;
   4. to be weighted;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. for the paper to work as isolator;
   2. for stopping after a while the chemical reaction that takes place;
   3. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   4. to accomodate ourselves to use chemicals;
   
   
3. When the electrical circuit is closed:
   1. electric current avoids the sample and the paper;
   2. elements from the metals are passed into solution as cations;
   3. cations from the solution are passed into sample as metals;
   4. surface of the sample is fastly covered by a protecting shield of electrons;
   
   
4. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
5. This method of analysis of metals and alloys is:
   1. useful for both metals and alloys;
   2. useful for pure metals, not so useful for alloys;
   3. a gravimetric method of analysis;
   4. a nondestructive method of analysis;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Hartia necesita ca īnainte de analiza probei:
   1. sa fie testata;
   2. sa fie arsa;
   3. sa i se masoare suprafata;
   4. sa fie cantarita;
   5. sa fie taiata īn bucati mici;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru ca hartia sa actioneze ca izolator;
   2. pentru oprirea dupa un timp reactiei chimice care are loc;
   3. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   4. sa ne acomodam in a utiliza substante chimice;
   
   
3. Cānd circuitul electric este īnchis:
   1. curent electric evita proba si hārtia;
   2. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   3. cationii din solutie sunt trecuti īn proba ca metale;
   4. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   
   
4. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. utila atāt pentru metale si aliaje;
   2. utila pentru metale pure, nu atāt de utila pentru aliaje;
   3. o metoda gravimetrica de analiza;
   4. o metoda nedistructiva de analiza;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The density of the solutions depends on:
   1. time elapsed since were prepared;
   2. concentration;
   3. temperature;
   4. pressure;
   
   
2. When a chemical reaction is balanced, following should be considered:
   1. all glassware should be clean before, after and during the experiment;
   2. the principle of the conservation of the energy;
   3. the liquid in the burette should be at the same level before and after conducting the experiment;
   4. the principle of the conservation of the volume;
   
   
3. The indicator should be added:
   1. to provide a color change at equivalence point;
   2. only at the suggestion of the supervisor;
   3. in large quantities, according to the principle 'only size matters';
   4. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   
   
4. Titration as a laboratory operation involves:
   1. a salt solution;
   2. a pH-metter;
   3. a burette;
   4. a pH indicator that changes color depending on the pH of the solution;
   
   
5. In the calculations:
   1. are necessary to use our phones;
   2. are necessary to discuss with our colleagues;
   3. are necessary to use some formulas expressing in different ways the concentration;
   4. are necessary to take some information from reagent bottles;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Densitatea solutiilor depinde de:
   1. timpul scurs de cand au fost pregatite;
   2. concentratie;
   3. temperatura;
   4. presiune;
   
   
2. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   2. principiul conservarii energiei;
   3. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   4. principiul conservarii volumului;
   
   
3. Trebuie adaugat indicatorul:
   1. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   2. numai la sugestia supraveghetorului;
   3. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   4. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   5. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   
   
4. Titrarea ca o operatiune de laborator implica:
   1. o solutie de sare;
   2. un pH-metru;
   3. o biureta;
   4. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   5. amestecul a doua sau mai multe solutii;
   
   
5. In calcule:
   1. este necesar sa utilizam telefoanele;
   2. este necesar sa discutam cu colegii;
   3. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   4. este necesar a se lua unele informatii de pe sticlele de reactivi;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. When a chemical reaction is balanced, following should be considered:
   1. all glassware should be clean before and after conducting the experiment;
   2. the principle of the conservation of the number of atoms for each element;
   3. the liquid in the burette should be at the same level before and after conducting the experiment;
   4. all glassware should be clean before, after and during the experiment;
   
   
2. Reactions between acids and bases:
   1. have as a consequence the dissolution of a salt;
   2. have as effect the change of the color of a solution;
   3. always have as a consequence the formation of a quantity of water;
   4. are all exothermic, being therefore dangerous outside of the laboratory;
   
   
3. A redox process:
   1. occurs only when we mix wrong substances in the laboratory;
   2. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. involves a transfer of electrons from one atom or group of atoms to another;
   4. involves changing of the aggregation states of some participants to the reaction;
   
   
4. The equivalence point is:
   1. the point in which a reactive should be added in the burette;
   2. used to balance the equation;
   3. something rarely encountered in chemistry;
   4. indicated when a color change is observed into the solution;
   
   
5. The indicator should be added:
   1. only in special cases, when the burette is graded from its bottom to its top;
   2. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   3. only at the suggestion of the supervisor;
   4. to provide a color change at equivalence point;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   2. principiul conservarii numarul de atomi pentru fiecare element;
   3. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   4. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   
   
2. Reactiile īntre acizi si baze:
   1. au drept consecinta dizolvarea unei sari;
   2. au ca efect schimbarea culorii unei solutii;
   3. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   4. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   5. sunt rareori utile, si chiar mai rar utilizate;
   
   
3. Un proces redox:
   1. apare numai atunci cānd se amesteca substante gresit īn laborator;
   2. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   4. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   
   
4. Punctul de echivalenta este:
   1. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   2. folosit pentru a echilibra ecuatia;
   3. ceva rar īntālnit īn chimie;
   4. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   
   
5. Trebuie adaugat indicatorul:
   1. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   2. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   3. numai la sugestia supraveghetorului;
   4. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   5. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The density of the solutions depends on:
   1. concentration;
   2. pressure;
   3. provider;
   4. quantity;
   
   
2. Titration as a laboratory operation involves:
   1. an mixing of two ore more solutions;
   2. a pH indicator that changes color depending on the pH of the solution;
   3. a burette;
   4. a volume measurement;
   
   
3. Reactions between acids and bases:
   1. have as a consequence the dissolution of a salt;
   2. are always fast, taking place almost instantaneously;
   3. have as effect the change of the color of a solution;
   4. always have as a consequence the formation of a quantity of water;
   
   
4. In the calculations:
   1. are necessary to establish the coefficients of the chemical reaction;
   2. are necessary to use some formulas expressing in different ways the concentration;
   3. are necessary to take the results imediatly after these are available from others;
   4. are necessary to discuss with our colleagues;
   
   
5. The equivalence point is:
   1. used to balance the equation;
   2. the point in which a reactive should be added in the reaction flask;
   3. indicated when a color change is observed into the solution;
   4. something rarely encountered in chemistry;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Densitatea solutiilor depinde de:
   1. concentratie;
   2. presiune;
   3. furnizor;
   4. cantitate;
   
   
2. Titrarea ca o operatiune de laborator implica:
   1. amestecul a doua sau mai multe solutii;
   2. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   3. o biureta;
   4. masurarea volumului;
   5. un standard sau reactiv de referinta;
   
   
3. Reactiile īntre acizi si baze:
   1. au drept consecinta dizolvarea unei sari;
   2. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   3. au ca efect schimbarea culorii unei solutii;
   4. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   
   
4. In calcule:
   1. este necesara stabilirea coeficientilor reactiei chimice;
   2. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   3. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   4. este necesar sa discutam cu colegii;
   
   
5. Punctul de echivalenta este:
   1. folosit pentru a echilibra ecuatia;
   2. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   3. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   4. ceva rar īntālnit īn chimie;
   5. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The equivalence point is:
   1. used to balance the equation;
   2. the point in which a reactive should be added in the reaction flask;
   3. something rarely encountered in chemistry;
   4. the point in which a reactive is fully consumed in the reaction;
   
   
2. Reactions between acids and bases:
   1. have as effect the change of the color of a solution;
   2. always have as a consequence the formation of a quantity of water;
   3. are always fast, taking place almost instantaneously;
   4. are rarely useful, and even rarely used;
   
   
3. In the calculations:
   1. are necessary to draw the tables in our notebooks after completing of the experiment;
   2. are necessary to use some formulas expressing in different ways the concentration;
   3. are necessary to take some information from reagent bottles;
   4. are necessary to establish the coefficients of the chemical reaction;
   
   
4. The indicator should be added:
   1. only in special cases, when the burette is graded from its bottom to its top;
   2. to provide a color change at equivalence point;
   3. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   4. to indicate our safety limits when we dealt with chemicals;
   
   
5. Titration as a laboratory operation involves:
   1. a pH indicator that changes color depending on the pH of the solution;
   2. a burette;
   3. a pH-metter;
   4. a mass measurement;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Punctul de echivalenta este:
   1. folosit pentru a echilibra ecuatia;
   2. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   3. ceva rar īntālnit īn chimie;
   4. punctul īn care un reactiv este consumat complet īn reactie;
   
   
2. Reactiile īntre acizi si baze:
   1. au ca efect schimbarea culorii unei solutii;
   2. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   3. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   4. sunt rareori utile, si chiar mai rar utilizate;
   5. au drept consecinta dizolvarea unei sari;
   
   
3. In calcule:
   1. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   2. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   3. este necesar a se lua unele informatii de pe sticlele de reactivi;
   4. este necesara stabilirea coeficientilor reactiei chimice;
   
   
4. Trebuie adaugat indicatorul:
   1. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   2. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   3. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   4. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   
   
5. Titrarea ca o operatiune de laborator implica:
   1. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   2. o biureta;
   3. un pH-metru;
   4. masurarea masei;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. A redox process:
   1. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. is considered to be the following one: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. is always fast and safe;
   
   
2. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the number of atoms for each element;
   2. the principle of the conservation of the volume;
   3. all glassware should be clean before and after conducting the experiment;
   4. the liquid in the burette should be at the same level before and after conducting the experiment;
   
   
3. The density of the solutions depends on:
   1. temperature;
   2. provider;
   3. time elapsed since were prepared;
   4. quantity;
   
   
4. The following chemical reactions were used in the experiments:
   1. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. H₂O + CO₂ -> H₂CO₃
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
5. In the calculations:
   1. are necessary to use our phones;
   2. are necessary to establish the coefficients of the chemical reaction;
   3. are necessary to take the results imediatly after these are available from others;
   4. are necessary to draw the tables in our notebooks after completing of the experiment;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Un proces redox:
   1. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. este īntotdeauna rapid si sigur;
   
   
2. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii numarul de atomi pentru fiecare element;
   2. principiul conservarii volumului;
   3. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   4. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   
   
3. Densitatea solutiilor depinde de:
   1. temperatura;
   2. furnizor;
   3. timpul scurs de cand au fost pregatite;
   4. cantitate;
   5. concentratie;
   
   
4. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. H₂O + CO₂ -> H₂CO₃
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
5. In calcule:
   1. este necesar sa utilizam telefoanele;
   2. este necesara stabilirea coeficientilor reactiei chimice;
   3. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   4. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   5. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. For a water sample following measures may be quantitatively expressed:
   1. total acidity;
   2. hardness;
   3. total alkalinity;
   4. mineral acidity;
   
   
2. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   
3. In the laboratory were analyzed:
   1. the mass of the water;
   2. the concentration of the water;
   3. the temperature of the water;
   4. the acidity of the water;
   
   
4. We may say the followings:
   1. water is pure only when is taken from a good freshwater mountain stream;
   2. water is good for drinking, it is nothing to be analysed;
   3. natural water may contain organic matter and living organisms;
   4. purification of the water may include physical processes;
   
   
5. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   4. HCl + CO₃^2- -> HCO₃^- + Cl^-
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate totala;
   2. duritate;
   3. alcalinitate totala;
   4. aciditate minerala;
   5. puritate;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   5. NaOH + Cl^- -> NaCl + HO^-
   
   
3. Īn laborator au fost analizate:
   1. masa apei;
   2. concentratia apei;
   3. temperatura apei;
   4. aciditatea apei;
   5. alcalinitatea apei;
   
   
4. Putem spune urmatoarele:
   1. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   2. apa este buna pentru consum, nu este nimic de a fi analizat;
   3. apa naturala poate contine materie organica si organisme vii;
   4. purificarea apei poate include procedee fizice;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   2. HCl + HO^- -> H₂O+Cl^-
   3. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   4. HCl + CO₃^2- -> HCO₃^- + Cl^-
   5. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   2. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   3. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   4. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   
   
2. In the laboratory the water were:
   1. acidified for drinking purposes;
   2. softened using the resin column;
   3. complexed by using EDTA titrimetric method;
   4. hardened using the resin column;
   
   
3. In the laboratory were analyzed:
   1. the alkalinity of the water;
   2. the hardness of the water;
   3. the mass of the water;
   4. the acidity of the water;
   
   
4. For a water sample following measures may be quantitatively expressed:
   1. mineral acidity;
   2. color;
   3. permanent alkalinity;
   4. total acidity;
   
   
5. We may say the followings:
   1. purification of the water may include labeling processes;
   2. purification of the water may include biological processes;
   3. natural water may contain organic matter and living organisms;
   4. when water contains dissolved minerals and gases is bad for drinking;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   2. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   3. NaOH + CO₃^2- -> HCO₃^- + HO^-
   4. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   5. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   
2. In laborator apa au fost:
   1. acidulata pentru baut;
   2. dedurizata folosind coloana de rasina;
   3. complexata prin metoda titrimetrica EDTA;
   4. calita folosind coloana de rasina;
   
   
3. Īn laborator au fost analizate:
   1. alcalinitatea apei;
   2. duritatea apei;
   3. masa apei;
   4. aciditatea apei;
   
   
4. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate minerala;
   2. culoare;
   3. alcalinitate permanenta;
   4. aciditate totala;
   5. alcalinitate totala;
   
   
5. Putem spune urmatoarele:
   1. purificarea apei poate include procesele de etichetare;
   2. purificarea apei poate include procese biologice;
   3. apa naturala poate contine materie organica si organisme vii;
   4. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   5. apa este buna pentru consum, nu este nimic de a fi analizat;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   2. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   
2. In the laboratory the water were:
   1. softened using the resin column;
   2. acidified for drinking purposes;
   3. hardened using the resin column;
   4. biologically purified using the resin column;
   
   
3. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Cl^- -> NaCl + HO^-
   2. NaOH + Cl⁺ -> NaCl + HO⁺
   3. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   4. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   
   
4. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   
5. We may say the followings:
   1. when water contains dissolved minerals and gases is bad for drinking;
   2. purification of the water may include biological processes;
   3. water is a good polar solvent;
   4. purification of the water may include physical processes;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   2. NaOH + CO₃^2- -> HCO₃^- + HO^-
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   
2. In laborator apa au fost:
   1. dedurizata folosind coloana de rasina;
   2. acidulata pentru baut;
   3. calita folosind coloana de rasina;
   4. purificata biologic utilizānd coloana de rasina;
   5. complexata prin metoda titrimetrica EDTA;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + Cl^- -> NaCl + HO^-
   2. NaOH + Cl⁺ -> NaCl + HO⁺
   3. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   4. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   4. HCl + HO⁺ -> H₂O + Cl⁺
   5. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   
5. Putem spune urmatoarele:
   1. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   2. purificarea apei poate include procese biologice;
   3. apa este un solvent polar bun;
   4. purificarea apei poate include procedee fizice;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   
   
2. We may say the followings:
   1. purification of the water may include physical processes;
   2. purification of the water may include chemical processes;
   3. when water contains dissolved minerals and gases is bad for drinking;
   4. purification of the water may include labeling processes;
   
   
3. In the laboratory the water were:
   1. alkalinized for drinking purposes;
   2. complexed by using EDTA titrimetric method;
   3. biologically purified using the resin column;
   4. hardened using the resin column;
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   4. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. permanent alkalinity;
   2. color;
   3. mineral acidity;
   4. hardness;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   5. NaOH + NO₃^- -> NaNO₃ + HO^-
   
   
2. Putem spune urmatoarele:
   1. purificarea apei poate include procedee fizice;
   2. purificarea apei poate include procese chimice;
   3. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   4. purificarea apei poate include procesele de etichetare;
   
   
3. In laborator apa au fost:
   1. alcalinizeaza pentru baut;
   2. complexata prin metoda titrimetrica EDTA;
   3. purificata biologic utilizānd coloana de rasina;
   4. calita folosind coloana de rasina;
   5. dedurizata folosind coloana de rasina;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   4. NaOH + CO₃^2- -> HCO₃^- + HO^-
   5. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. alcalinitate permanenta;
   2. culoare;
   3. aciditate minerala;
   4. duritate;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   4. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   
2. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Cl^- -> NaCl + HO^-
   2. NaOH + NO₃^- -> NaNO₃ + HO^-
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   
3. We may say the followings:
   1. purification of the water may include chemical processes;
   2. water is good for drinking, it is nothing to be analysed;
   3. water is pure only when is taken from a good freshwater mountain stream;
   4. when water contains dissolved minerals and gases is bad for drinking;
   
   
4. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   
5. In the laboratory were analyzed:
   1. the color of the water;
   2. the concentration of the water;
   3. the temperature of the water;
   4. the alkalinity of the water;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   4. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + Cl^- -> NaCl + HO^-
   2. NaOH + NO₃^- -> NaNO₃ + HO^-
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   
3. Putem spune urmatoarele:
   1. purificarea apei poate include procese chimice;
   2. apa este buna pentru consum, nu este nimic de a fi analizat;
   3. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   4. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   
5. Īn laborator au fost analizate:
   1. culoarea apei;
   2. concentratia apei;
   3. temperatura apei;
   4. alcalinitatea apei;
   
   

FINAL TEST AT LABORATORY
Volumetric and gravimetric methods in study of corrosion

1. The aluminum plate:
   1. the mass is measured before and after immersing it in NaOH;
   2. was involved in the gravimetric method of corrosion analysis
   3. was involved in the volumetric method of corrosion analysis
   4. the surface is measured before and after immersing it in NaOH;
   
   
2. Corrosion of metals:
   1. is a beneficial process that shows the stability of metals;
   2. can be reduced by electroplating;
   3. is the destruction of metals under the action of external factors;
   4. is the protection in time to chemical agents;
   
   
3. The zinc plate:
   1. was degreased in sulfuric acid solution;
   2. was corroded in sulfuric solution;
   3. the surface is measured before and after immersing it in H₂SO₄;
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   
4. In studied corrosion processes:
   1. a gas is released only the corrosion of zinc;
   2. a gas is released only the corrosion of aluminum;
   3. when a gas is released its volume depends on the amount of metal corroded;
   4. always the metal changes its oxidation state;
   
   
5. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Zn -> H₂ + Zn²⁺
   2. Ni(CO)₄ -> Ni + CO
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   

TEST DE FINAL DE LABORATOR
Metode volumetrice si gravimetrice in studiul coroziunii

1. Pentru placa de aluminiu:
   1. masa este masurata īnainte si dupa imersia īn NaOH;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. a fost implicata īn metoda volumetrica de analiza a coroziunii
   4. suprafata se masoara īnainte si dupa imersia īn NaOH;
   5. volumul se masoara īnainte si dupa imersia īn NaOH;
   
   
2. Coroziunea metalelor:
   1. este un proces benefic care arata stabilitatea metalelor;
   2. poate fi redusa prin galvanizare;
   3. este distrugerea metalelor sub actiunea factorilor externi;
   4. este protectia de durata impotriva agentilor chimici;
   5. are loc pur si simplu prin expunerea la umiditate īn aer;
   
   
3. Pentru placa de zinc:
   1. a fost degresata īn solutie de acid sulfuric;
   2. a fost corodata īn solutie sulfuric;
   3. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   
4. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea zincului;
   2. un gaz este eliberat numai la corodarea aluminiului;
   3. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   4. īntotdeauna metalul isi schimba starea de oxidare;
   5. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   
   
5. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Zn -> H₂ + Zn²⁺
   2. Ni(CO)₄ -> Ni + CO
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   

FINAL TEST AT LABORATORY
Volumetric and gravimetric methods in study of corrosion

1. The aluminum plate:
   1. the surface is measured before and after immersing it in NaOH;
   2. the volume is measured before and after immersing it in NaOH;
   3. was involved in the volumetric method of corrosion analysis
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   
2. Corrosion of metals:
   1. may provide useful raw materials for analysis;
   2. is the destruction of metals under the action of external factors;
   3. is the protection in time to chemical agents;
   4. can be reduced by passivation;
   
   
3. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Zn -> H₂ + Zn²⁺
   2. Ni(CO)₄ -> Ni + CO
   3. ZnO + CO -> Zn + CO₂
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
4. In studied corrosion processes:
   1. a gas is released only the corrosion of zinc;
   2. a gas is released at both corrosion of zinc and aluminum;
   3. when a gas is released its volume depends on the amount of metal corroded;
   4. the metal it changes its oxidation state becoming an anion;
   
   
5. The zinc plate:
   1. the volume is measured before and after immersing it in H₂SO₄;
   2. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   3. was degreased in sulfuric acid solution;
   4. was corroded in sulfuric solution;
   
   

TEST DE FINAL DE LABORATOR
Metode volumetrice si gravimetrice in studiul coroziunii

1. Pentru placa de aluminiu:
   1. suprafata se masoara īnainte si dupa imersia īn NaOH;
   2. volumul se masoara īnainte si dupa imersia īn NaOH;
   3. a fost implicata īn metoda volumetrica de analiza a coroziunii
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   
2. Coroziunea metalelor:
   1. poate furniza materii prime utile pentru analiza;
   2. este distrugerea metalelor sub actiunea factorilor externi;
   3. este protectia de durata impotriva agentilor chimici;
   4. poate fi redusa prin pasivare;
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Zn -> H₂ + Zn²⁺
   2. Ni(CO)₄ -> Ni + CO
   3. ZnO + CO -> Zn + CO₂
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
4. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea zincului;
   2. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   3. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   4. metalul isi schimba starea de oxidare pentru a deveni un anion;
   
   
5. Pentru placa de zinc:
   1. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   2. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   3. a fost degresata īn solutie de acid sulfuric;
   4. a fost corodata īn solutie sulfuric;
   
   

FINAL TEST AT LABORATORY
Volumetric and gravimetric methods in study of corrosion

1. In studied corrosion processes:
   1. always the metal changes its oxidation state;
   2. when a gas is released its volume depends on the amount of metal corroded;
   3. a gas is released only the corrosion of aluminum;
   4. a gas is released only the corrosion of zinc;
   
   
2. The aluminum plate:
   1. the volume is measured before and after immersing it in NaOH;
   2. the mass is measured before and after immersing it in NaOH;
   3. the surface is measured before and after immersing it in NaOH;
   4. was corroded in sodium hydroxide solution;
   
   
3. Which of the following reactions may be called as of corrosion:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
4. The zinc plate:
   1. the surface is measured before and after immersing it in H₂SO₄;
   2. was corroded in sulfuric solution;
   3. the mass is measured before and after immersing it in H₂SO₄;
   4. was involved in the volumetric method of corrosion analysis
   
   
5. Corrosion of metals:
   1. is the destruction of metals under the action of external factors;
   2. can be reduced by passivation;
   3. is a beneficial process that shows the stability of metals;
   4. is helping in the process of cleaning the metals surfaces;
   
   

TEST DE FINAL DE LABORATOR
Metode volumetrice si gravimetrice in studiul coroziunii

1. Īn procesele de coroziune studiate:
   1. īntotdeauna metalul isi schimba starea de oxidare;
   2. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   3. un gaz este eliberat numai la corodarea aluminiului;
   4. un gaz este eliberat numai la corodarea zincului;
   
   
2. Pentru placa de aluminiu:
   1. volumul se masoara īnainte si dupa imersia īn NaOH;
   2. masa este masurata īnainte si dupa imersia īn NaOH;
   3. suprafata se masoara īnainte si dupa imersia īn NaOH;
   4. a fost corodata īn solutie de hidroxid de sodiu;
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
4. Pentru placa de zinc:
   1. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   2. a fost corodata īn solutie sulfuric;
   3. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   5. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   
5. Coroziunea metalelor:
   1. este distrugerea metalelor sub actiunea factorilor externi;
   2. poate fi redusa prin pasivare;
   3. este un proces benefic care arata stabilitatea metalelor;
   4. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   
   

FINAL TEST AT LABORATORY
Volumetric and gravimetric methods in study of corrosion

1. The aluminum plate:
   1. the mass is measured before and after immersing it in NaOH;
   2. was degreased in sodium hydroxide solution;
   3. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. the volume is measured before and after immersing it in NaOH;
   
   
2. In studied corrosion processes:
   1. a gas is released only the corrosion of zinc;
   2. when a gas is released its volume depends on the amount of metal corroded;
   3. a gas is released only the corrosion of aluminum;
   4. always the metal changes its oxidation state;
   
   
3. Corrosion of metals:
   1. can be reduced by electroplating;
   2. is the protection in time to chemical agents;
   3. is a beneficial process that shows the stability of metals;
   4. is the destruction of metals under the action of external factors;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. Ni(CO)₄ -> Ni + CO
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. Al₂O₃ + NaOH -> NaAlO₂
   4. ZnO + CO -> Zn + CO₂
   
   
5. The zinc plate:
   1. the mass is measured before and after immersing it in H₂SO₄;
   2. was degreased in sulfuric acid solution;
   3. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. was involved in the volumetric method of corrosion analysis
   
   

TEST DE FINAL DE LABORATOR
Metode volumetrice si gravimetrice in studiul coroziunii

1. Pentru placa de aluminiu:
   1. masa este masurata īnainte si dupa imersia īn NaOH;
   2. a fost degresata īn solutie de hidroxid de sodiu;
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. volumul se masoara īnainte si dupa imersia īn NaOH;
   5. suprafata se masoara īnainte si dupa imersia īn NaOH;
   
   
2. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea zincului;
   2. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   3. un gaz este eliberat numai la corodarea aluminiului;
   4. īntotdeauna metalul isi schimba starea de oxidare;
   5. metalul isi schimba starea de oxidare pentru a deveni un anion;
   
   
3. Coroziunea metalelor:
   1. poate fi redusa prin galvanizare;
   2. este protectia de durata impotriva agentilor chimici;
   3. este un proces benefic care arata stabilitatea metalelor;
   4. este distrugerea metalelor sub actiunea factorilor externi;
   5. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Ni(CO)₄ -> Ni + CO
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. Al₂O₃ + NaOH -> NaAlO₂
   4. ZnO + CO -> Zn + CO₂
   5. H⁺ + Ni -> H₂ + Ni²⁺
   
   
5. Pentru placa de zinc:
   1. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   2. a fost degresata īn solutie de acid sulfuric;
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   

FINAL TEST AT LABORATORY
Volumetric and gravimetric methods in study of corrosion

1. The zinc plate:
   1. was involved in the volumetric method of corrosion analysis
   2. was corroded in sulfuric solution;
   3. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. the mass is measured before and after immersing it in H₂SO₄;
   
   
2. The aluminum plate:
   1. the mass is measured before and after immersing it in NaOH;
   2. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   3. was corroded in sodium hydroxide solution;
   4. was involved in the gravimetric method of corrosion analysis
   
   
3. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. a gas is released only the corrosion of zinc;
   3. always the metal changes its oxidation state;
   4. a gas is released at both corrosion of zinc and aluminum;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. Ni(CO)₄ -> Ni + CO
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
5. Corrosion of metals:
   1. is helping in the process of cleaning the metals surfaces;
   2. is the protection in time to chemical agents;
   3. can be reduced by electroplating;
   4. is a beneficial process that shows the stability of metals;
   
   

TEST DE FINAL DE LABORATOR
Metode volumetrice si gravimetrice in studiul coroziunii

1. Pentru placa de zinc:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. a fost corodata īn solutie sulfuric;
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   5. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   
   
2. Pentru placa de aluminiu:
   1. masa este masurata īnainte si dupa imersia īn NaOH;
   2. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   3. a fost corodata īn solutie de hidroxid de sodiu;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   5. volumul se masoara īnainte si dupa imersia īn NaOH;
   
   
3. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. un gaz este eliberat numai la corodarea zincului;
   3. īntotdeauna metalul isi schimba starea de oxidare;
   4. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Ni(CO)₄ -> Ni + CO
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
5. Coroziunea metalelor:
   1. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   2. este protectia de durata impotriva agentilor chimici;
   3. poate fi redusa prin galvanizare;
   4. este un proces benefic care arata stabilitatea metalelor;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. It is expected to have a mass of nickel deposited:
   1. proportional with the intensity of the current used;
   2. inversely proportional with the intensity of the current used;
   3. inversely proportional with the surface of the sample;
   4. inversely proportional with the nickel plating time;
   
   
2. Electrical conductivity of nickel salts solutions:
   1. is reduced by salts additions;
   2. is relatively small;
   3. is improved by salts additions;
   4. depends on the potential of the source used;
   
   
3. At the nickel plating following reactions took place:
   1. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   2. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   3. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   4. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   
   
4. The intensity of the current:
   1. is to be calculated after conducting the experiment;
   2. affect only the quality of the nickel deposition;
   3. it depends on the surface of the sample;
   4. is to be calculated before to start the experiment;
   
   
5. Theoretical mass of nickel deposited is calculated using:
   1. solutions laws;
   2. perfect gas law;
   3. the electrolysis law;
   4. the conservation of the energy law;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Este de asteptat ca masa de nichel depus sa fie:
   1. proportionala cu intensitatea curentului utilizat;
   2. invers proportionala cu intensitatea curentului utilizat;
   3. invers proportionala cu suprafata probei;
   4. invers proportional cu timpul de nichelare;
   
   
2. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este redusa prin adaosuri de saruri;
   2. este relativ mica;
   3. este īmbunatatita prin adaosuri de saruri;
   4. depinde de potentialul sursei utilizate;
   
   
3. La nichelare urmatoarele reactii au avut loc:
   1. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   2. la catod (-), īn contact cu piesa metalica, Ni²⁺ + 2e^- -> Ni⁰
   3. la anod (+), īn legatura cu piesa de nichel, Ni²⁺ + 2e^- -> Ni⁰
   4. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   
   
4. Intensitatea curentului:
   1. se calculeaza dupa efectuarea experimentului;
   2. afecteaza numai calitatea depunerii nichelului;
   3. depinde de suprafata probei;
   4. trebuie sa fie calculata īnainte de a īncepe experimentul;
   
   
5. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea solutilor;
   2. legea gazelor perfecte;
   3. legea electrolizei;
   4. legea conservarii energiei;
   5. legea actiunii maselor;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. Electrical conductivity of nickel salts solutions:
   1. is reduced by salts additions;
   2. is relatively high;
   3. depends on the intensity of the current used;
   4. depends on the potential of the source used;
   
   
2. It is expected to have a mass of nickel deposited:
   1. inversely proportional with the surface of the sample;
   2. proportional with the nickel plating time;
   3. much lower than the calculated theoretical one;
   4. lower than the calculated theoretical one;
   
   
3. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   2. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the anode: O^2- - 2e^- -> O₂⁰
   3. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   4. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   
   
4. The intensity of the current:
   1. affect only the quantity of the nickel deposition;
   2. is to be calculated after conducting the experiment;
   3. affect only the quality of the nickel deposition;
   4. it depends on the surface of the sample;
   
   
5. Theoretical mass of nickel deposited is calculated using:
   1. solutions laws;
   2. the electrolysis law;
   3. the conservation of the energy law;
   4. the conservation of the number of atoms for each element law;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este redusa prin adaosuri de saruri;
   2. este relativ mare;
   3. depinde de intensitatea curentului utilizat;
   4. depinde de potentialul sursei utilizate;
   
   
2. Este de asteptat ca masa de nichel depus sa fie:
   1. invers proportionala cu suprafata probei;
   2. proportionala cu timpul de nichelare;
   3. mult mai mica decāt cea teoretica calculata;
   4. mai mica decāt cea teoretica calculata;
   5. proportionala cu intensitatea curentului utilizat;
   
   
3. La nichelare urmatoarele reactii au avut loc:
   1. la anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   2. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la anod: O^2- - 2e^- -> O₂⁰
   3. la catod (-), īn contact cu piesa metalica, Ni²⁺ + 2e^- -> Ni⁰
   4. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   5. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   
   
4. Intensitatea curentului:
   1. afecteaza numai cantitatea de nichel depus;
   2. se calculeaza dupa efectuarea experimentului;
   3. afecteaza numai calitatea depunerii nichelului;
   4. depinde de suprafata probei;
   5. trebuie sa fie ajustata cand se incepe experimentul;
   
   
5. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea solutilor;
   2. legea electrolizei;
   3. legea conservarii energiei;
   4. conservarea numarului de atomi pentru fiecare element;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. Theoretical mass of nickel deposited is calculated using:
   1. law of mass action;
   2. the electrolysis law;
   3. the conservation of the number of atoms for each element law;
   4. perfect gas law;
   
   
2. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   2. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   3. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the anode: O^2- - 2e^- -> O₂⁰
   4. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   
   
3. Electrical conductivity of nickel salts solutions:
   1. is improved by salts additions;
   2. depends on the potential of the source used;
   3. is reduced by salts additions;
   4. is relatively high;
   
   
4. The intensity of the current:
   1. is to be adjusted when the experiment starts;
   2. affect only the quantity of the nickel deposition;
   3. should be adjusted by the technicians, we have nothing to do there;
   4. is to be calculated before to start the experiment;
   
   
5. It is expected to have a mass of nickel deposited:
   1. much higher than the calculated theoretical one;
   2. proportional with the nickel plating time;
   3. proportional with the surface of the sample;
   4. inversely proportional with the surface of the sample;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea actiunii maselor;
   2. legea electrolizei;
   3. conservarea numarului de atomi pentru fiecare element;
   4. legea gazelor perfecte;
   
   
2. La nichelare urmatoarele reactii au avut loc:
   1. la anod (+), īn legatura cu piesa de nichel, Ni²⁺ + 2e^- -> Ni⁰
   2. la anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   3. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la anod: O^2- - 2e^- -> O₂⁰
   4. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   5. la catod (-), īn contact cu piesa metalica, Ni²⁺ + 2e^- -> Ni⁰
   
   
3. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este īmbunatatita prin adaosuri de saruri;
   2. depinde de potentialul sursei utilizate;
   3. este redusa prin adaosuri de saruri;
   4. este relativ mare;
   
   
4. Intensitatea curentului:
   1. trebuie sa fie ajustata cand se incepe experimentul;
   2. afecteaza numai cantitatea de nichel depus;
   3. ar trebui sa fie ajustata de catre tehnicieni, nu avem nimic de a face acolo;
   4. trebuie sa fie calculata īnainte de a īncepe experimentul;
   
   
5. Este de asteptat ca masa de nichel depus sa fie:
   1. mult mai mare decāt cea teoretica calculata;
   2. proportionala cu timpul de nichelare;
   3. proportionala cu suprafata probei;
   4. invers proportionala cu suprafata probei;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. Electrical conductivity of nickel salts solutions:
   1. is relatively high;
   2. depends on the intensity of the current used;
   3. is reduced by salts additions;
   4. depends on the potential of the source used;
   
   
2. The intensity of the current:
   1. is to be calculated after conducting the experiment;
   2. affect only the quality of the nickel deposition;
   3. is to be adjusted when the experiment starts;
   4. does not affect the quality nor the quantity of the nickel deposition;
   
   
3. It is expected to have a mass of nickel deposited:
   1. much higher than the calculated theoretical one;
   2. inversely proportional with the surface of the sample;
   3. proportional with the surface of the sample;
   4. higher than the calculated theoretical one;
   
   
4. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   2. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   3. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   4. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   
   
5. Theoretical mass of nickel deposited is calculated using:
   1. the conservation of the number of atoms for each element law;
   2. solutions laws;
   3. law of mass action;
   4. perfect gas law;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este relativ mare;
   2. depinde de intensitatea curentului utilizat;
   3. este redusa prin adaosuri de saruri;
   4. depinde de potentialul sursei utilizate;
   
   
2. Intensitatea curentului:
   1. se calculeaza dupa efectuarea experimentului;
   2. afecteaza numai calitatea depunerii nichelului;
   3. trebuie sa fie ajustata cand se incepe experimentul;
   4. nu afecteaza calitatea nici cantitatea nichelului depus;
   5. depinde de suprafata probei;
   
   
3. Este de asteptat ca masa de nichel depus sa fie:
   1. mult mai mare decāt cea teoretica calculata;
   2. invers proportionala cu suprafata probei;
   3. proportionala cu suprafata probei;
   4. mai mare decāt cea teoretica calculata;
   5. invers proportional cu timpul de nichelare;
   
   
4. La nichelare urmatoarele reactii au avut loc:
   1. la anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   2. la anod (+), īn legatura cu piesa de nichel, Ni²⁺ + 2e^- -> Ni⁰
   3. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   4. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   
   
5. Masa teoretica de nichel depus se calculeaza folosind:
   1. conservarea numarului de atomi pentru fiecare element;
   2. legea solutilor;
   3. legea actiunii maselor;
   4. legea gazelor perfecte;
   5. legea electrolizei;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. Electrical conductivity of nickel salts solutions:
   1. depends on the potential of the source used;
   2. depends on the intensity of the current used;
   3. is reduced by salts additions;
   4. is relatively small;
   
   
2. It is expected to have a mass of nickel deposited:
   1. much higher than the calculated theoretical one;
   2. proportional with the nickel plating time;
   3. inversely proportional with the nickel plating time;
   4. much lower than the calculated theoretical one;
   
   
3. Theoretical mass of nickel deposited is calculated using:
   1. the electrolysis law;
   2. the conservation of the number of atoms for each element law;
   3. perfect gas law;
   4. the conservation of the energy law;
   
   
4. At the nickel plating following reactions took place:
   1. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   2. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   3. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   4. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   
   
5. The intensity of the current:
   1. affect only the quantity of the nickel deposition;
   2. does not affect the quality nor the quantity of the nickel deposition;
   3. is to be calculated after conducting the experiment;
   4. is to be adjusted when the experiment starts;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. depinde de potentialul sursei utilizate;
   2. depinde de intensitatea curentului utilizat;
   3. este redusa prin adaosuri de saruri;
   4. este relativ mica;
   
   
2. Este de asteptat ca masa de nichel depus sa fie:
   1. mult mai mare decāt cea teoretica calculata;
   2. proportionala cu timpul de nichelare;
   3. invers proportional cu timpul de nichelare;
   4. mult mai mica decāt cea teoretica calculata;
   5. proportionala cu intensitatea curentului utilizat;
   
   
3. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea electrolizei;
   2. conservarea numarului de atomi pentru fiecare element;
   3. legea gazelor perfecte;
   4. legea conservarii energiei;
   5. legea solutilor;
   
   
4. La nichelare urmatoarele reactii au avut loc:
   1. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   2. la anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   3. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   4. la anod (+), īn legatura cu piesa de nichel, Ni²⁺ + 2e^- -> Ni⁰
   5. la catod (-), īn contact cu piesa metalica, Ni²⁺ + 2e^- -> Ni⁰
   
   
5. Intensitatea curentului:
   1. afecteaza numai cantitatea de nichel depus;
   2. nu afecteaza calitatea nici cantitatea nichelului depus;
   3. se calculeaza dupa efectuarea experimentului;
   4. trebuie sa fie ajustata cand se incepe experimentul;
   5. depinde de suprafata probei;