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

1. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory and our breathing;
   2. presence of the chlorine;
   3. formation of ammonium chloride;
   4. presence of the ammonia;
   
   
2. The position of the ring in the experiment is dependent on:
   1. the mode energy or mode speed of each involved species;
   2. the propagation of the species as ions and not as neutral molecules;
   3. the speed of diffusion of each involved species;
   4. the concentrations of the solutions used;
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the speed of diffusion of each involved species;
   2. the width of the tube and not of the length of the tube;
   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;
   
   
4. We may say the followings:
   1. diffusion process appears only in gaseous state;
   2. the kinetic energy of a molecule is affected by temperature and pressure;
   3. diffusion process appears in all gaseous, liquid and solid states;
   4. the molecules have energy only in gaseous state;
   
   
5. The chronometer is used in the experiment for:
   1. extracting the information necessary to calculate the diffusion coefficients;
   2. extracting the information necessary to calculate the speeds ratio;
   3. to keep us busy;
   4. measuring of the diffusion time;
   
   

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

1. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   2. prezentei clorului;
   3. formarea clorurii de amoniu;
   4. prezentei amoniacului;
   
   
2. Pozitia inelului īn experimentul este dependenta de:
   1. viteza la moda sau energia la moda a fiecarei specii implicate;
   2. propagarea speciilor ca ionii si nu ca si molecule neutre;
   3. viteza de difuzie a fiecarei specii implicate;
   4. concentratiile solutiilor utilizate;
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. viteza de difuzie a fiecarei specii implicate;
   2. latimea tubului si nu lungimea tubului;
   3. lungimea tubului si latimea tubului;
   4. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   
   
4. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. proces de difuzie apare numai īn stare gazoasa;
   2. energia cinetica a unei molecule este afectata de temperatura si presiune;
   3. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   4. moleculele au energie numai īn stare gazoasa;
   
   
5. Cronometrul este utilizat īn experimentul pentru:
   1. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   2. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   3. sa ne tina ocupati;
   4. masurarea timpului de difuzie;
   5. sincronizarea timpilor de difuzie;
   
   

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

1. The chronometer is used in the experiment for:
   1. synchronization of the diffusion times;
   2. extracting the information necessary to calculate the diffusion coefficients;
   3. to keep us busy;
   4. extracting the information necessary to calculate the speeds ratio;
   
   
2. At the ends of the tube following equilibrium reactions occurs:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + HCl \=\ NH₄Cl
   4. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   
   
3. 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 width of the tube and not of the length of the tube;
   3. the mode energy or mode speed of each involved species;
   4. the average energy or average speed of each involved species;
   
   
4. The position of the ring in the experiment is dependent on:
   1. the mode energy or mode speed of each involved species;
   2. the speed of diffusion of each involved species;
   3. the length of the tube and not of the width of the tube;
   4. the length of the tube and the width of the tube;
   
   
5. 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 energies;
   2. are considered to be at the same temperature, but may have different speeds;
   3. all have same energy;
   4. all are moving in an arbitrary direction;
   
   

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

1. Cronometrul este utilizat īn experimentul pentru:
   1. sincronizarea timpilor de difuzie;
   2. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   3. sa ne tina ocupati;
   4. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   5. masurarea timpului de difuzie;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + HCl \=\ NH₄Cl
   4. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   5. H₂O \=\ H⁺ + HO^-
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   2. latimea tubului si nu lungimea tubului;
   3. viteza la moda sau energia la moda a fiecarei specii implicate;
   4. energia medie sau viteza medie a fiecarei specii implicate;
   5. viteza de difuzie a fiecarei specii implicate;
   
   
4. Pozitia inelului īn experimentul este dependenta de:
   1. viteza la moda sau energia la moda a fiecarei specii implicate;
   2. viteza de difuzie a fiecarei specii implicate;
   3. lungimea tubului si nu latimea tubului;
   4. lungimea tubului si latimea tubului;
   
   
5. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   2. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   3. toate au aceeasi energie;
   4. toate se īndreapta īntr-o directie arbitrara;
   5. toate se deplaseaza īn aceeasi directie;
   
   

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. measuring of the diffusion time;
   4. indication of the moment when we should pay attention to the experiment;
   
   
2. The fog observed during the experiment is due to:
   1. formation of ammonium chloride;
   2. presence of the ammonia;
   3. unproper illumination in the laboratory and our breathing;
   4. presence of the chlorine;
   
   
3. At the ends of the tube following equilibrium reactions occurs:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. H⁺ + HO^- \=\ H₂O
   
   
4. We may say the followings:
   1. diffusion process appears in all gaseous, liquid and solid states;
   2. diffusion process appears only in gaseous state;
   3. the molecules have speeds in all gaseous, liquid and solid states;
   4. the molecules have speeds only in gaseous state;
   
   
5. The time to the formation of the ring in the experiment is dependent on:
   1. the speed of diffusion of each involved species;
   2. the mode energy or mode speed of each involved species;
   3. the length of the tube and the width of the tube;
   4. the real speeds and not the virtual 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. masurarea timpului de difuzie;
   4. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   5. sincronizarea timpilor de difuzie;
   
   
2. Ceata observata īn timpul experimentului se datoreaza:
   1. formarea clorurii de amoniu;
   2. prezentei amoniacului;
   3. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   4. prezentei clorului;
   
   
3. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. H⁺ + HO^- \=\ H₂O
   
   
4. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   2. proces de difuzie apare numai īn stare gazoasa;
   3. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   4. moleculele au viteze numai īn stare gazoasa;
   5. proces de difuzie apare numai īn stare gazoasa si lichida;
   
   
5. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. viteza de difuzie a fiecarei specii implicate;
   2. viteza la moda sau energia la moda a fiecarei specii implicate;
   3. lungimea tubului si latimea tubului;
   4. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   
   

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. synchronization of the diffusion times;
   4. measuring of the diffusion time;
   
   
2. The position of the ring in the experiment is dependent on:
   1. the concentrations of the solutions used;
   2. the propagation of the species as neutral molecules and not as ions;
   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;
   
   
3. At the ends of the tube following equilibrium reactions occurs:
   1. H₂O \=\ H⁺ + HO^-
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. NH₃ + HCl \=\ NH₄Cl
   
   
4. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory and our breathing;
   2. our experiment designed to trap the product of the reaction;
   3. presence of the chlorine;
   4. unproper illumination in the laboratory or our breathing;
   
   
5. We may say the followings:
   1. diffusion process appears only in gaseous state;
   2. the kinetic energy of a molecule is affected by temperature and pressure;
   3. diffusion process appears in all gaseous, liquid and solid states;
   4. the molecules have speeds in all gaseous, liquid and solid states;
   
   

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. sincronizarea timpilor de difuzie;
   4. masurarea timpului de difuzie;
   5. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   
   
2. Pozitia inelului īn experimentul este dependenta de:
   1. concentratiile solutiilor utilizate;
   2. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   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;
   
   
3. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H₂O \=\ H⁺ + HO^-
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. NH₃ + HCl \=\ NH₄Cl
   5. H⁺ + HO^- \=\ H₂O
   
   
4. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   2. experimentului nostru proiectat pentru a captura produsul de reactie;
   3. prezentei clorului;
   4. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   
   
5. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. proces de difuzie apare numai īn stare gazoasa;
   2. energia cinetica a unei molecule este afectata de temperatura si presiune;
   3. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   4. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   5. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   
   

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

1. 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 energies;
   3. all are moving in the same direction;
   4. all have same energy;
   
   
2. At the ends of the tube following equilibrium reactions occurs:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. H₂O \=\ H⁺ + HO^-
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
3. 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 speeds only in gaseous and liquid states;
   3. the molecules have speeds in all gaseous, liquid and solid states;
   4. diffusion process appears only in gaseous and liquid states;
   
   
4. The position of the ring in the experiment is dependent on:
   1. the length of the tube and the width of the tube;
   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 concentrations of the solutions used;
   
   
5. 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 propagation of the species as neutral molecules and not as ions;
   3. the real speeds and not the virtual speeds of each involved species;
   4. the speed of diffusion of each involved species;
   
   

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

1. 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 diferite energii;
   3. toate se deplaseaza īn aceeasi directie;
   4. toate au aceeasi energie;
   5. toate au aceeasi viteza;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. H₂O \=\ H⁺ + HO^-
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
3. 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 viteze numai īn stare gazoasa si lichida;
   3. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   4. proces de difuzie apare numai īn stare gazoasa si lichida;
   
   
4. Pozitia inelului īn experimentul este dependenta de:
   1. lungimea tubului si latimea tubului;
   2. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   3. energia medie sau viteza medie a fiecarei specii implicate;
   4. concentratiile solutiilor utilizate;
   
   
5. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   2. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   3. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   4. viteza de difuzie a fiecarei specii implicate;
   
   

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

1. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KNO₂ + O₂ -> KNO₃;
   2. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   3. KClO₃ -> KCl + O₂;
   4. KCl + O₂ -> KClO₃;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. ozone were released as result of the decomposition;
   2. we do not possess enough information to decide what gas was released from the reaction;
   3. the ideal model of a gas approximated the best the behavior of the released gas;
   4. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   
   
3. For gaseous state:
   1. the pressure is much lower than in liquid state;
   2. the pressure is much higher than in liquid state;
   3. the pressure is exactly the same as in liquid state;
   4. it exists an equation for all, p · V = n · R · T;
   
   
4. In the laboratory were studied:
   1. increasing of the pressure of a gas when was heated;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   3. the lost of the mass of a solid as result of producing of some gas;
   4. the producing of some gas as result of a lost of the mass of a solid;
   
   
5. A state equation for a real gas is:
   1. a relation which is always true, independent of the values of the state parameters;
   2. a relation which takes into account certain deviations from the ideal model;
   3. a relation between an certain number of state parameters;
   4. a relation obtained after conducting of the experiment;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KNO₂ + O₂ -> KNO₃;
   2. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   3. KClO₃ -> KCl + O₂;
   4. KCl + O₂ -> KClO₃;
   5. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. ozonul au fost eliberat ca urmare a descompunerii;
   2. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   4. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   5. oxigenul au fost eliberat ca urmare a descompunerii;
   
   
3. Pentru stare gazoasa:
   1. presiunea este mult mai mica decāt īn stare lichida;
   2. presiunea este mult mai mare decāt īn stare lichida;
   3. presiunea este exact la fel ca si īn stare lichida;
   4. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   5. presiunea se pot modifica atunci cānd apare o reactie chimica;
   
   
4. Īn laborator s-au studiat:
   1. cresterea presiunii unui gaz cānd s-a īncalzit;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   3. pierdut din masa de solid ca urmare a producerii unor gaze;
   4. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   
   
5. O ecuatie de stare pentru un gaz real este:
   1. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   2. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   3. o relatie īntre un anumit numar de parametri de stare;
   4. 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. the ideal model of a gas approximated the best the behavior of the released gas;
   2. we do not possess enough information to decide what gas was released from the reaction;
   3. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   4. the ideal model of a gas approximated the worst the behavior of the released gas;
   
   
2. In the laboratory were studied:
   1. increasing of the pressure of a gas when was heated;
   2. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   3. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   4. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   2. Ag₂O -> Ag + O₂;
   3. H₂O + O₂ -> H₂O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
4. A state equation for a real gas is:
   1. a relation obtained after conducting of the experiment;
   2. a relation which is always true, independent of the values of the state parameters;
   3. a relation which may involve some constants dependent of gas composition;
   4. usable in the laboratory, but is not to be used somewhere else;
   
   
5. For gaseous state:
   1. we need to take supplementary precautions in the laboratory;
   2. the pressure is much lower than in liquid state;
   3. it exists an equation for all, p · V = n · R · T;
   4. the pressure is much higher than in liquid state;
   
   

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. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   
   
2. Īn laborator s-au studiat:
   1. cresterea presiunii unui gaz cānd s-a īncalzit;
   2. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   3. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   2. Ag₂O -> Ag + O₂;
   3. H₂O + O₂ -> H₂O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. o relatie obtinut dupa efectuarea experimentului;
   2. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   3. o relatie care poate implica unele constante dependente de compozitia gazului;
   4. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   
   
5. Pentru stare gazoasa:
   1. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   2. presiunea este mult mai mica decāt īn stare lichida;
   3. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   4. presiunea este mult mai mare decāt īn stare lichida;
   
   

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

1. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   2. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   3. increasing of the pressure of a gas when was heated;
   4. increasing of the temperature of a solid mass when was heated;
   
   
2. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. Ag₂O -> Ag + O₂;
   2. H₂O + O₂ -> H₂O₂;
   3. KNO₃ -> KNO₂ + O₂;
   4. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   
   
3. For gaseous state:
   1. the pressure is much lower than in liquid state;
   2. we need to take supplementary precautions in the laboratory;
   3. the pressure is much higher than in liquid state;
   4. the pressure is approximately the same as in liquid state;
   
   
4. 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 may involve some constants dependent of gas composition;
   3. a relation derived to approximate the relation between state parameters;
   4. a relation obtained after conducting of the experiment;
   
   
5. 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. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   3. air were released as result of the decomposition;
   4. oxigen were released as result of the decomposition;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   3. cresterea presiunii unui gaz cānd s-a īncalzit;
   4. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   5. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. Ag₂O -> Ag + O₂;
   2. H₂O + O₂ -> H₂O₂;
   3. KNO₃ -> KNO₂ + O₂;
   4. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   5. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   
   
3. Pentru stare gazoasa:
   1. presiunea este mult mai mica decāt īn stare lichida;
   2. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   3. presiunea este mult mai mare decāt īn stare lichida;
   4. presiunea este aproximativ aceeasi ca si īn stare lichida;
   5. presiunea este neschimbata cānd apare o reactie chimica;
   
   
4. 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 poate implica unele constante dependente de compozitia gazului;
   3. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   4. o relatie obtinut dupa efectuarea experimentului;
   5. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   
   
5. 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. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   3. aer a fost eliberat ca urmare a descompunerii;
   4. oxigenul au fost eliberat ca urmare a descompunerii;
   
   

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

1. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. Ag₂O -> Ag + O₂;
   2. H₂O₂ -> H₂O + O₂;
   3. KNO₃ -> KNO₂ + O₂;
   4. Ag + O₂ -> Ag₂O;
   
   
2. In the laboratory were studied:
   1. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   2. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   3. the lost of the mass of a solid as result of producing of some gas;
   4. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   
   
3. For gaseous state:
   1. the pressure is unchanged when a chemical reaction occurs;
   2. the pressure is exactly the same as in liquid state;
   3. the pressure is approximately the same as in liquid state;
   4. the pressure is much lower than in liquid state;
   
   
4. A state equation for a real gas is:
   1. a relation between an certain number of state parameters;
   2. usable in the laboratory, but is not to be used somewhere else;
   3. a relation which may involve some constants dependent of gas composition;
   4. a relation obtained after conducting of the experiment;
   
   
5. 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. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   3. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   4. oxigen were released as result of the decomposition;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. Ag₂O -> Ag + O₂;
   2. H₂O₂ -> H₂O + O₂;
   3. KNO₃ -> KNO₂ + O₂;
   4. Ag + O₂ -> Ag₂O;
   
   
2. Īn laborator s-au studiat:
   1. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   2. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   3. pierdut din masa de solid ca urmare a producerii unor gaze;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   5. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   
   
3. Pentru stare gazoasa:
   1. presiunea este neschimbata cānd apare o reactie chimica;
   2. presiunea este exact la fel ca si īn stare lichida;
   3. presiunea este aproximativ aceeasi ca si īn stare lichida;
   4. presiunea este mult mai mica decāt īn stare lichida;
   5. presiunea depinde de modelul care este utilizat pentru o aproxima;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un anumit numar de parametri de stare;
   2. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   3. o relatie care poate implica unele constante dependente de compozitia gazului;
   4. o relatie obtinut dupa efectuarea experimentului;
   5. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   
   
5. 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. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   3. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. oxigenul au fost eliberat ca urmare a descompunerii;
   5. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   
   

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. we do not 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. oxigen were released as result of the decomposition;
   
   
2. In the laboratory were studied:
   1. increasing of the temperature of a solid mass when was heated;
   2. the producing of some gas as result of a lost of the mass of a solid;
   3. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   4. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   
   
3. For gaseous state:
   1. the pressure is approximately the same as in liquid state;
   2. we need to take supplementary precautions in the laboratory;
   3. the pressure depends on the model which are used to approximate it;
   4. it exists an equation for all, p · V = n · R · T;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KNO₃ -> KNO₂ + O₂;
   2. KCl + O₂ -> KClO₃;
   3. Ag + O₂ -> Ag₂O;
   4. H₂O₂ -> H₂O + O₂;
   
   
5. A state equation for a real gas is:
   1. a relation obtained after conducting of the experiment;
   2. a relation which may involve some constants dependent of gas composition;
   3. a relation between an certain number of state parameters;
   4. a relation between an unlimited number of state parameters;
   
   

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. nu 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. oxigenul au fost eliberat ca urmare a descompunerii;
   5. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   
   
2. Īn laborator s-au studiat:
   1. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   2. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   3. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   4. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   
   
3. Pentru stare gazoasa:
   1. presiunea este aproximativ aceeasi ca si īn stare lichida;
   2. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   3. presiunea depinde de modelul care este utilizat pentru o aproxima;
   4. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   5. presiunea este exact la fel ca si īn stare lichida;
   
   
4. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KNO₃ -> KNO₂ + O₂;
   2. KCl + O₂ -> KClO₃;
   3. Ag + O₂ -> Ag₂O;
   4. H₂O₂ -> H₂O + O₂;
   5. Ag₂O -> Ag + O₂;
   
   
5. O ecuatie de stare pentru un gaz real este:
   1. o relatie obtinut dupa efectuarea experimentului;
   2. o relatie care poate implica unele constante dependente de compozitia gazului;
   3. o relatie īntre un anumit numar de parametri de stare;
   4. o relatie īntre un numar nelimitat de parametri de stare;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. a nondestructive method of analysis;
   2. too ancient to be used today in the laboratory;
   3. useful for pure metals, not so useful for alloys;
   4. useful for both metals and alloys;
   
   
2. The paper requires before analysis of the sample:
   1. to be weighted;
   2. to be moistened with an electrolyte;
   3. to be burned;
   4. to measure its surface;
   
   
3. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
4. When lead is identified:
   1. dangerous substances are used;
   2. precautions should be made for toxic wastes disposal;
   3. a heat release is observed;
   4. a red-brown complex appears;
   
   
5. Why moisten the paper with solution of sodium nitrate?
   1. to accomodate ourselves to use chemicals;
   2. to be cut easily with scissors;
   3. to provide cations for analysis;
   4. for stopping after a while the chemical reaction that takes place;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda nedistructiva de analiza;
   2. prea veche pentru a fi utilizata īn prezent īn laborator;
   3. utila pentru metale pure, nu atāt de utila pentru aliaje;
   4. utila atāt pentru metale si aliaje;
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie cantarita;
   2. sa fie umezita cu un electrolit;
   3. sa fie arsa;
   4. sa i se masoare suprafata;
   
   
3. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   5. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
4. Cānd plumbul este identificat:
   1. sunt utilizate substante periculoase;
   2. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   3. se observa o eliberare de caldura;
   4. apare un complex rosu-brun;
   5. interferenta altor ioni poate afecta rezultatul;
   
   
5. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa ne acomodam in a utiliza substante chimice;
   2. sa fie taiat cu usurinta cu foarfeca;
   3. pentru furniza cationi pentru analiza;
   4. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When lead is identified:
   1. a violet complex appears;
   2. precautions should be made for toxic wastes disposal;
   3. a yellow complex appears;
   4. a heat release is observed;
   
   
2. The paper requires before analysis of the sample:
   1. to be cut in small pieces;
   2. to be burned;
   3. to be moistened with an electrolyte;
   4. to be tested;
   
   
3. Why moisten the paper with solution of sodium nitrate?
   1. to provide cations for analysis;
   2. to have something to do in the laboratory;
   3. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   4. to accomodate ourselves to use chemicals;
   
   
4. 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. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
5. When aluminum is identified:
   1. supplementary precautions should be taken, because the plates are made from aluminum too;
   2. is identified as Al²⁺ cation;
   3. is identified as Al¹⁺ cation;
   4. the presence of other ions may produce a true negative outcome;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd plumbul este identificat:
   1. apare un complex violet;
   2. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   3. apare un complex galben;
   4. se observa o eliberare de caldura;
   5. reactiile utilizate īn mod clar ii indica prezenta;
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie taiata īn bucati mici;
   2. sa fie arsa;
   3. sa fie umezita cu un electrolit;
   4. sa fie testata;
   5. sa fie uscata;
   
   
3. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru furniza cationi pentru analiza;
   2. pentru a avea ceva de a face īn laborator;
   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;
   5. pentru ca hartia sa actioneze ca izolator;
   
   
4. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   2. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
5. Cānd aluminiu este identificat:
   1. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   2. este identificat ca cationul Al²⁺;
   3. este identificat ca cationul Al¹⁺;
   4. prezenta altor ioni poate produce un rezultat adevarat negativ;
   5. prezenta altor ioni poate produce un rezultat fals pozitiv;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. a destructive method of analysis;
   2. useful for both metals and alloys;
   3. useful for pure metals, not so useful for alloys;
   4. a quantitative method of analysis;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. to have something to do in the laboratory;
   2. to be cut easily with scissors;
   3. for the paper to work as isolator;
   4. to provide cations for analysis;
   
   
3. The paper requires before analysis of the sample:
   1. to be weighted;
   2. to be moistened with an electrolyte;
   3. to be tested;
   4. to be acidified;
   
   
4. When the electrical circuit is closed:
   1. surface of the sample is fastly covered by a protecting shield of electrons;
   2. cations from the solution are passed into sample as metals;
   3. electric current passes the sample and the paper;
   4. elements from the metals are passed into solution as anions;
   
   
5. When lead is identified:
   1. a red-brown complex appears;
   2. a yellow complex appears;
   3. a blue complex appears;
   4. a violet complex appears;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda distructiva de analiza;
   2. utila atāt pentru metale si aliaje;
   3. utila pentru metale pure, nu atāt de utila pentru aliaje;
   4. o metoda cantitativa de analiza;
   5. prea veche pentru a fi utilizata īn prezent īn laborator;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru a avea ceva de a face īn laborator;
   2. sa fie taiat cu usurinta cu foarfeca;
   3. pentru ca hartia sa actioneze ca izolator;
   4. pentru furniza cationi pentru analiza;
   
   
3. Hartia necesita ca īnainte de analiza probei:
   1. sa fie cantarita;
   2. sa fie umezita cu un electrolit;
   3. sa fie testata;
   4. sa fie acidulata;
   
   
4. Cānd circuitul electric este īnchis:
   1. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   2. cationii din solutie sunt trecuti īn proba ca metale;
   3. curent electric trece prin proba si hārtie;
   4. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   
   
5. Cānd plumbul este identificat:
   1. apare un complex rosu-brun;
   2. apare un complex galben;
   3. apare un complex albastru;
   4. apare un complex violet;
   5. interferenta altor ioni poate afecta rezultatul;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. Why moisten the paper with solution of sodium nitrate?
   1. to have something to do in the laboratory;
   2. to provide cations for analysis;
   3. to accomodate ourselves to use chemicals;
   4. for stopping after a while the chemical reaction that takes place;
   
   
2. The paper requires before analysis of the sample:
   1. to be dry;
   2. to measure its surface;
   3. to be burned;
   4. to be tested;
   
   
3. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
4. When the electrical circuit is closed:
   1. elements from the metals are passed into solution as cations;
   2. elements from the solution are passed into sample as metals;
   3. electric current avoids the sample and the paper;
   4. cations from the solution are passed into sample as metals;
   
   
5. When aluminum is identified:
   1. using of alizarin along with ammonium hidroxide provide a red colored complex;
   2. is identified as Al¹⁺ cation;
   3. is identified as Al³⁺ cation;
   4. the presence of other ions may produce a true positive outcome;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru a avea ceva de a face īn laborator;
   2. pentru furniza cationi pentru analiza;
   3. sa ne acomodam in a utiliza substante chimice;
   4. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie uscata;
   2. sa i se masoare suprafata;
   3. sa fie arsa;
   4. sa fie testata;
   5. sa fie taiata īn bucati mici;
   
   
3. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   5. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
4. Cānd circuitul electric este īnchis:
   1. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   2. elemente din solutie sunt trecute īn proba ca metale;
   3. curent electric evita proba si hārtia;
   4. cationii din solutie sunt trecuti īn proba ca metale;
   5. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   
   
5. Cānd aluminiu este identificat:
   1. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   2. este identificat ca cationul Al¹⁺;
   3. este identificat ca cationul Al³⁺;
   4. prezenta altor ioni poate produce un rezultat adevarat pozitiv;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. Why moisten the paper with solution of sodium nitrate?
   1. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   2. to be cut easily with scissors;
   3. to accomodate ourselves to use chemicals;
   4. to provide cations for analysis;
   
   
2. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
3. The paper requires before analysis of the sample:
   1. to be moistened with an electrolyte;
   2. to be acidified;
   3. to measure its surface;
   4. to be weighted;
   
   
4. When lead is identified:
   1. a red-brown complex appears;
   2. the reactions used clearly indicates its presence;
   3. dangerous substances are used;
   4. a heat release is observed;
   
   
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. a nondestructive method of analysis;
   4. a quantitative method of analysis;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   2. sa fie taiat cu usurinta cu foarfeca;
   3. sa ne acomodam in a utiliza substante chimice;
   4. pentru furniza cationi pentru analiza;
   5. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   
2. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
3. Hartia necesita ca īnainte de analiza probei:
   1. sa fie umezita cu un electrolit;
   2. sa fie acidulata;
   3. sa i se masoare suprafata;
   4. sa fie cantarita;
   5. sa fie uscata;
   
   
4. Cānd plumbul este identificat:
   1. apare un complex rosu-brun;
   2. reactiile utilizate īn mod clar ii indica prezenta;
   3. sunt utilizate substante periculoase;
   4. se observa o eliberare de caldura;
   
   
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. o metoda nedistructiva de analiza;
   4. o metoda cantitativa de analiza;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Titration as a laboratory operation involves:
   1. an mixing of two ore more solutions;
   2. a burette;
   3. a mass measurement;
   4. a sulphuric acid solution;
   
   
2. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the energy;
   2. the liquid in the burette should be at the same level before and after conducting the experiment;
   3. the principle of the conservation of the number of atoms for each element;
   4. all glassware should be clean before, after and during the experiment;
   
   
3. Reactions between acids and bases:
   1. are all exothermic, being therefore dangerous outside of the laboratory;
   2. always have as a consequence the formation of a quantity of water;
   3. have as a consequence the dissolution of a salt;
   4. have as effect the change of the color of a solution;
   
   
4. The following chemical reactions were used in the experiments:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
5. A redox process:
   1. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. involves changing of the aggregation states of some participants to the reaction;
   3. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. involves changing of the oxidation states of some participants to the reaction;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Titrarea ca o operatiune de laborator implica:
   1. amestecul a doua sau mai multe solutii;
   2. o biureta;
   3. masurarea masei;
   4. o solutie de acid sulfuric;
   5. un standard sau reactiv de referinta;
   
   
2. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii energiei;
   2. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   3. principiul conservarii numarul de atomi pentru fiecare element;
   4. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   5. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   
   
3. Reactiile īntre acizi si baze:
   1. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   2. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   3. au drept consecinta dizolvarea unei sari;
   4. au ca efect schimbarea culorii unei solutii;
   5. sunt rareori utile, si chiar mai rar utilizate;
   
   
4. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
5. Un proces redox:
   1. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   3. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The equivalence point is:
   1. the point in which a reactive is fully consumed in the reaction;
   2. indicated when a color change is observed into the solution;
   3. something rarely encountered in chemistry;
   4. the point in which a reactive should be added in the reaction flask;
   
   
2. Reactions between acids and bases:
   1. are all exothermic, being therefore dangerous outside of the laboratory;
   2. are rarely useful, and even rarely used;
   3. are always fast, taking place almost instantaneously;
   4. have as effect the change of the color of a solution;
   
   
3. The indicator should be added:
   1. to provide a color change at equivalence point;
   2. to indicate our safety limits when we dealt with chemicals;
   3. only at the suggestion of the supervisor;
   4. in large quantities, according to the principle 'only size matters';
   
   
4. 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 principle of the conservation of the volume;
   4. the principle of the conservation of the energy;
   
   
5. The following chemical reactions were used in the experiments:
   1. H₂O + CO₂ -> H₂CO₃
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Punctul de echivalenta este:
   1. punctul īn care un reactiv este consumat complet īn reactie;
   2. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   3. ceva rar īntālnit īn chimie;
   4. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   
   
2. Reactiile īntre acizi si baze:
   1. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   2. sunt rareori utile, si chiar mai rar utilizate;
   3. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   4. au ca efect schimbarea culorii unei solutii;
   
   
3. Trebuie adaugat indicatorul:
   1. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   2. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   3. numai la sugestia supraveghetorului;
   4. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   
   
4. 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. principiul conservarii volumului;
   4. principiul conservarii energiei;
   5. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   
   
5. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂O + CO₂ -> H₂CO₃
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. In the calculations:
   1. are necessary to draw the tables in our notebooks after completing of the experiment;
   2. are necessary to use our phones;
   3. are necessary to take some information from reagent bottles;
   4. are necessary to discuss with our colleagues;
   
   
2. The following chemical reactions were used in the experiments:
   1. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
3. The indicator should be added:
   1. in large quantities, according to the principle 'only size matters';
   2. to provide a color change at equivalence point;
   3. in small quantities, to avoid the errors in observations and in calculations;
   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 burette;
   2. a pH-metter;
   3. a pH indicator that changes color depending on the pH of the solution;
   4. a salt solution;
   
   
5. The density of the solutions depends on:
   1. time elapsed since were prepared;
   2. concentration;
   3. quantity;
   4. provider;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. In calcule:
   1. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   2. este necesar sa utilizam telefoanele;
   3. este necesar a se lua unele informatii de pe sticlele de reactivi;
   4. este necesar sa discutam cu colegii;
   5. este necesara stabilirea coeficientilor reactiei chimice;
   
   
2. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   5. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   
3. Trebuie adaugat indicatorul:
   1. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   2. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   3. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   4. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   
   
4. Titrarea ca o operatiune de laborator implica:
   1. o biureta;
   2. un pH-metru;
   3. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   4. o solutie de sare;
   5. o solutie de hidroxid de sodiu;
   
   
5. Densitatea solutiilor depinde de:
   1. timpul scurs de cand au fost pregatite;
   2. concentratie;
   3. cantitate;
   4. furnizor;
   5. temperatura;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. 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. all glassware should be clean before, after and during the experiment;
   3. the principle of the conservation of the energy;
   4. all glassware should be clean before and after conducting the experiment;
   
   
2. The indicator should be added:
   1. only at the suggestion of the supervisor;
   2. to indicate our safety limits when we dealt with chemicals;
   3. in large quantities, according to the principle 'only size matters';
   4. only in special cases, when the burette is graded from its bottom to its top;
   
   
3. In the calculations:
   1. are necessary to discuss with our colleagues;
   2. are necessary to take some information from reagent bottles;
   3. are necessary to draw the tables in our notebooks after completing of the experiment;
   4. are necessary to use some formulas expressing in different ways the concentration;
   
   
4. Reactions between acids and bases:
   1. have as a consequence the dissolution of a salt;
   2. always have as a consequence the formation of a quantity of water;
   3. are all exothermic, being therefore dangerous outside of the laboratory;
   4. are rarely useful, and even rarely used;
   
   
5. The equivalence point is:
   1. the point in which a reactive should be added in the burette;
   2. used to balance the equation;
   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. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii numarul de atomi pentru fiecare element;
   2. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   3. principiul conservarii energiei;
   4. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   5. principiul conservarii volumului;
   
   
2. Trebuie adaugat indicatorul:
   1. numai la sugestia supraveghetorului;
   2. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   3. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   4. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   
   
3. In calcule:
   1. este necesar sa discutam cu colegii;
   2. este necesar a se lua unele informatii de pe sticlele de reactivi;
   3. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   4. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   5. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   
   
4. Reactiile īntre acizi si baze:
   1. au drept consecinta dizolvarea unei sari;
   2. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   3. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   4. sunt rareori utile, si chiar mai rar utilizate;
   
   
5. Punctul de echivalenta este:
   1. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   2. folosit pentru a echilibra ecuatia;
   3. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   4. ceva rar īntālnit īn chimie;
   5. punctul īn care un reactiv este consumat complet īn reactie;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The indicator should be added:
   1. to indicate our safety limits when we dealt with chemicals;
   2. to provide a color change at equivalence point;
   3. in large quantities, according to the principle 'only size matters';
   4. only in special cases, when the burette is graded from its bottom to its top;
   
   
2. The equivalence point is:
   1. the point in which a reactive should be added in the burette;
   2. the point in which a reactive should be added in the reaction flask;
   3. used to balance the equation;
   4. the point in which a reactive is fully consumed in the reaction;
   
   
3. Titration as a laboratory operation involves:
   1. a mass measurement;
   2. a standard or referential reactive;
   3. an mixing of two ore more solutions;
   4. a sulphuric acid solution;
   
   
4. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the energy;
   2. the liquid in the burette should be at the same level before and after conducting the experiment;
   3. all glassware should be clean before and after conducting the experiment;
   4. all glassware should be clean before, after and during the experiment;
   
   
5. Reactions between acids and bases:
   1. are always fast, taking place almost instantaneously;
   2. have as effect the change of the color of a solution;
   3. are all exothermic, being therefore dangerous outside of the laboratory;
   4. have as a consequence the dissolution of a salt;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Trebuie adaugat indicatorul:
   1. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   2. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   3. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   4. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   
   
2. Punctul de echivalenta este:
   1. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   2. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   3. folosit pentru a echilibra ecuatia;
   4. punctul īn care un reactiv este consumat complet īn reactie;
   5. ceva rar īntālnit īn chimie;
   
   
3. Titrarea ca o operatiune de laborator implica:
   1. masurarea masei;
   2. un standard sau reactiv de referinta;
   3. amestecul a doua sau mai multe solutii;
   4. o solutie de acid sulfuric;
   5. o solutie de hidroxid de sodiu;
   
   
4. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii energiei;
   2. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   3. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   4. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   
   
5. Reactiile īntre acizi si baze:
   1. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   2. au ca efect schimbarea culorii unei solutii;
   3. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   4. au drept consecinta dizolvarea unei sari;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. We may say the followings:
   1. purification of the water may include chemical processes;
   2. purification of the water may include biological processes;
   3. water is a good polar solvent;
   4. water is pure only when is taken from a good freshwater mountain stream;
   
   
2. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   2. NaOH + HCOO^- -> HCOONa + HO^-
   3. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   4. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   
3. For a water sample following measures may be quantitatively expressed:
   1. mineral acidity;
   2. purity;
   3. total alkalinity;
   4. total acidity;
   
   
4. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   2. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   
5. In the laboratory were analyzed:
   1. the alkalinity of the water;
   2. the solubility of the water;
   3. the hardness of the water;
   4. the mass of the water;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Putem spune urmatoarele:
   1. purificarea apei poate include procese chimice;
   2. purificarea apei poate include procese biologice;
   3. apa este un solvent polar bun;
   4. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   2. NaOH + HCOO^- -> HCOONa + HO^-
   3. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   4. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   5. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   
3. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate minerala;
   2. puritate;
   3. alcalinitate totala;
   4. aciditate totala;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   2. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   5. HCl + CO₃^2- -> HCO₃^- + Cl^-
   
   
5. Īn laborator au fost analizate:
   1. alcalinitatea apei;
   2. solubilitatea apei;
   3. duritatea apei;
   4. masa apei;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. In the laboratory were analyzed:
   1. the mass of the water;
   2. the boiling point of the water;
   3. the softness of the water;
   4. the temperature of the water;
   
   
2. In the laboratory the water were:
   1. biologically purified using the resin column;
   2. complexed by using EDTA titrimetric method;
   3. alkalinized for drinking purposes;
   4. softened using the resin column;
   
   
3. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   
   
4. EDTA is used:
   1. for safety precautions purposes;
   2. for recharging of the resin for water softening;
   3. for indication of the equilibrium point in the reaction;
   4. for complexing of Ca²⁺ and Mg²⁺ ions;
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. total acidity;
   2. mineral acidity;
   3. color;
   4. permanent alkalinity;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Īn laborator au fost analizate:
   1. masa apei;
   2. punctul de fierbere al apei;
   3. moliciunea apei;
   4. temperatura apei;
   5. duritatea apei;
   
   
2. In laborator apa au fost:
   1. purificata biologic utilizānd coloana de rasina;
   2. complexata prin metoda titrimetrica EDTA;
   3. alcalinizeaza pentru baut;
   4. dedurizata folosind coloana de rasina;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   5. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   
   
4. EDTA este utilizat:
   1. ca masura de siguranta;
   2. pentru reīncarcarea rasinii la dedurizarea apei;
   3. pentru indicarea punctului de echilibru īn reactie;
   4. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate totala;
   2. aciditate minerala;
   3. culoare;
   4. alcalinitate permanenta;
   5. 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 + CH₃COO^- -> CH₃COONa + HO^-
   2. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + CH₃COO⁺ -> CH₃COONa + 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. biologically purified using the resin column;
   
   
3. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   4. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   
   
4. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + HO⁺ -> H₂O + Cl⁺
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. HCl + HO^- -> H₂O + Cl^-
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. hardness;
   2. color;
   3. total alkalinity;
   4. permanent alkalinity;
   
   

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 + CO₃²⁺ -> HCO₃⁺ + HO⁺
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. 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. purificata biologic utilizānd coloana de rasina;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   4. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + HO⁺ -> H₂O + Cl⁺
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. HCl + HO^- -> H₂O+Cl^-
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. duritate;
   2. culoare;
   3. alcalinitate totala;
   4. alcalinitate permanenta;
   5. aciditate totala;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   2. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   3. HCl + HO^- -> H₂O + Cl^-
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
2. EDTA is used:
   1. for recharging of the resin for water softening;
   2. as reagent for determining the hardness of the water;
   3. for safety precautions purposes;
   4. for indication of the equilibrium point in the reaction;
   
   
3. 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 + Zn²⁺ -> Zn(OH)₂ + Na⁺
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + HCOO^- -> HCOONa + HO^-
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   4. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   
   
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 + CO₃^2- -> HCO₃^- + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   2. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   3. HCl + HO^- -> H₂O + Cl^-
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   5. HCl + HO⁺ -> H₂O + Cl⁺
   
   
2. EDTA este utilizat:
   1. pentru reīncarcarea rasinii la dedurizarea apei;
   2. ca reactiv pentru determinarea duritatii apei;
   3. ca masura de siguranta;
   4. pentru indicarea punctului de echilibru īn reactie;
   5. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   
   
3. 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 + Zn²⁺ -> Zn(OH)₂ + Na⁺
   5. NaOH + NO₃^- -> NaNO₃ + HO^-
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + HCOO^- -> HCOONa + HO^-
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + CO₃^2- -> HCO₃^- + HO^-
   4. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   
   
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 + CO₃^2- -> HCO₃^- + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. EDTA is used:
   1. for indication of the equilibrium point in the reaction;
   2. for safety precautions purposes;
   3. for complexing of Ca²⁺ and Mg²⁺ ions;
   4. for recharging of the resin for water softening;
   
   
2. For a water sample following measures may be quantitatively expressed:
   1. purity;
   2. color;
   3. hardness;
   4. mineral acidity;
   
   
3. We may say the followings:
   1. water is good for drinking, it is nothing to be analysed;
   2. purification of the water may include biological processes;
   3. when water contains dissolved minerals and gases is bad for drinking;
   4. natural water may contain organic matter and living organisms;
   
   
4. In the laboratory were analyzed:
   1. the temperature of the water;
   2. the alkalinity of the water;
   3. the solubility of the water;
   4. the color of the water;
   
   
5. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   3. HCl + HO^- -> H₂O + Cl^-
   4. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. EDTA este utilizat:
   1. pentru indicarea punctului de echilibru īn reactie;
   2. ca masura de siguranta;
   3. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   4. pentru reīncarcarea rasinii la dedurizarea apei;
   
   
2. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. puritate;
   2. culoare;
   3. duritate;
   4. aciditate minerala;
   
   
3. Putem spune urmatoarele:
   1. apa este buna pentru consum, nu este nimic de a fi analizat;
   2. purificarea apei poate include procese biologice;
   3. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   4. apa naturala poate contine materie organica si organisme vii;
   
   
4. Īn laborator au fost analizate:
   1. temperatura apei;
   2. alcalinitatea apei;
   3. solubilitatea apei;
   4. culoarea apei;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   3. HCl + HO^- -> H₂O+Cl^-
   4. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   
   

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 zinc;
   4. the metal it changes its oxidation state becoming an anion;
   
   
2. The zinc plate:
   1. was involved in the volumetric method of corrosion analysis
   2. the mass is measured before and after immersing it in H₂SO₄;
   3. the volume is measured before and after immersing it in H₂SO₄;
   4. was degreased in sulfuric acid solution;
   
   
3. The aluminum plate:
   1. the surface is measured before and after immersing it in NaOH;
   2. was corroded in sodium hydroxide solution;
   3. the mass is measured before and after immersing it in NaOH;
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. ZnO + CO -> Zn + CO₂
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
5. Corrosion of metals:
   1. is the protection in time to chemical agents;
   2. takes place merely from exposure to moisture in air;
   3. may provide useful raw materials for analysis;
   4. is the destruction of metals under the action of external factors;
   
   

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 zincului;
   4. metalul isi schimba starea de oxidare pentru a deveni un anion;
   5. un gaz este eliberat numai la corodarea aluminiului;
   
   
2. Pentru placa de zinc:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   3. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   4. a fost degresata īn solutie de acid sulfuric;
   5. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   
   
3. Pentru placa de aluminiu:
   1. suprafata se masoara īnainte si dupa imersia īn NaOH;
   2. a fost corodata īn solutie de hidroxid de sodiu;
   3. masa este masurata īnainte si dupa imersia īn NaOH;
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   5. volumul se masoara īnainte si dupa imersia īn NaOH;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + CO -> Zn + CO₂
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
5. Coroziunea metalelor:
   1. este protectia de durata impotriva agentilor chimici;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. poate furniza materii prime utile pentru analiza;
   4. este distrugerea metalelor sub actiunea factorilor externi;
   
   

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

1. The zinc plate:
   1. was degreased in sulfuric acid solution;
   2. the mass is measured before and after immersing it in H₂SO₄;
   3. the surface is measured before and after immersing it in H₂SO₄;
   4. was involved in the volumetric method of corrosion analysis
   
   
2. The aluminum plate:
   1. the volume is measured before and after immersing it in NaOH;
   2. was involved in the gravimetric method of corrosion analysis
   3. the surface is measured before and after immersing it in NaOH;
   4. was degreased in sodium hydroxide solution;
   
   
3. Which of the following reactions may be called as of corrosion:
   1. Ni(CO)₄ -> Ni + CO
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. Al₂O₃ + NaOH -> NaAlO₂
   4. ZnO + CO -> Zn + CO₂
   
   
4. In studied corrosion processes:
   1. always the metal changes its oxidation state;
   2. a gas is released at both corrosion of zinc and aluminum;
   3. a gas is released only the corrosion of aluminum;
   4. the metal it changes its oxidation state becoming an cation;
   
   
5. Corrosion of metals:
   1. may provide useful raw materials for analysis;
   2. takes place merely from exposure to moisture in air;
   3. can be reduced by passivation;
   4. can be reduced by electroplating;
   
   

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

1. Pentru placa de zinc:
   1. a fost degresata īn solutie de acid sulfuric;
   2. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   3. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   5. a fost corodata īn solutie sulfuric;
   
   
2. Pentru placa de aluminiu:
   1. volumul se masoara īnainte si dupa imersia īn NaOH;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. suprafata se masoara īnainte si dupa imersia īn NaOH;
   4. a fost degresata īn solutie de hidroxid de sodiu;
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Ni(CO)₄ -> Ni + CO
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. Al₂O₃ + NaOH -> NaAlO₂
   4. ZnO + CO -> Zn + CO₂
   5. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
4. Īn procesele de coroziune studiate:
   1. īntotdeauna metalul isi schimba starea de oxidare;
   2. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   3. un gaz este eliberat numai la corodarea aluminiului;
   4. metalul isi schimba starea de oxidare pentru a deveni un cation;
   
   
5. Coroziunea metalelor:
   1. poate furniza materii prime utile pentru analiza;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. poate fi redusa prin pasivare;
   4. poate fi redusa prin galvanizare;
   5. este protectia de durata impotriva agentilor chimici;
   
   

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

1. Corrosion of metals:
   1. takes place merely from exposure to moisture in air;
   2. is the destruction of metals under the action of external factors;
   3. can be reduced by passivation;
   4. may provide useful raw materials for analysis;
   
   
2. The aluminum plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. the surface is measured before and after immersing it in NaOH;
   3. the mass is measured before and after immersing it in NaOH;
   4. the volume is measured before and after immersing it in NaOH;
   
   
3. In studied corrosion processes:
   1. when a gas is released its volume depends on the amount of metal corroded;
   2. a gas is released only the corrosion of zinc;
   3. the metal it changes its oxidation state becoming an cation;
   4. a gas is released only the corrosion of aluminum;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. ZnO + CO -> Zn + CO₂
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
5. The zinc plate:
   1. was involved in the volumetric method of corrosion analysis
   2. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   3. was involved in the gravimetric method of corrosion analysis
   4. was degreased in sulfuric acid solution;
   
   

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

1. Coroziunea metalelor:
   1. are loc pur si simplu prin expunerea la umiditate īn aer;
   2. este distrugerea metalelor sub actiunea factorilor externi;
   3. poate fi redusa prin pasivare;
   4. poate furniza materii prime utile pentru analiza;
   5. este protectia de durata impotriva agentilor chimici;
   
   
2. Pentru placa de aluminiu:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. suprafata se masoara īnainte si dupa imersia īn NaOH;
   3. masa este masurata īnainte si dupa imersia īn NaOH;
   4. volumul se masoara īnainte si dupa imersia īn NaOH;
   
   
3. Īn procesele de coroziune studiate:
   1. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   2. un gaz este eliberat numai la corodarea zincului;
   3. metalul isi schimba starea de oxidare pentru a deveni un cation;
   4. un gaz este eliberat numai la corodarea aluminiului;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + CO -> Zn + CO₂
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   5. H⁺ + Fe -> H₂ + Fe²⁺
   
   
5. Pentru placa de zinc:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   3. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. a fost degresata īn solutie de acid sulfuric;
   5. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   
   

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

1. The aluminum plate:
   1. was corroded in sodium hydroxide solution;
   2. was involved in the volumetric method of corrosion analysis
   3. the volume is measured before and after immersing it in NaOH;
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   
2. In studied corrosion processes:
   1. when a gas is released its volume depends on the amount of metal corroded;
   2. always the metal changes its oxidation state;
   3. the metal it changes its oxidation state becoming an cation;
   4. a gas is released only the corrosion of aluminum;
   
   
3. Corrosion of metals:
   1. is a beneficial process that shows the stability of metals;
   2. is helping in the process of cleaning the metals surfaces;
   3. can be reduced by electroplating;
   4. can be reduced by passivation;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. ZnO + CO -> Zn + CO₂
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. Ni(CO)₄ -> Ni + CO
   
   
5. The zinc plate:
   1. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   2. the volume is measured before and after immersing it in H₂SO₄;
   3. was degreased in sulfuric acid solution;
   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. a fost corodata īn solutie de hidroxid de sodiu;
   2. a fost implicata īn metoda volumetrica de analiza a coroziunii
   3. volumul se masoara īnainte si dupa imersia īn NaOH;
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   
2. Īn procesele de coroziune studiate:
   1. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   2. īntotdeauna metalul isi schimba starea de oxidare;
   3. metalul isi schimba starea de oxidare pentru a deveni un cation;
   4. un gaz este eliberat numai la corodarea aluminiului;
   5. un gaz este eliberat numai la corodarea zincului;
   
   
3. Coroziunea metalelor:
   1. este un proces benefic care arata stabilitatea metalelor;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. poate fi redusa prin galvanizare;
   4. poate fi redusa prin pasivare;
   5. are loc pur si simplu prin expunerea la umiditate īn aer;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + CO -> Zn + CO₂
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. Ni(CO)₄ -> Ni + CO
   5. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   
   
5. Pentru placa de zinc:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   3. a fost degresata īn solutie de acid sulfuric;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   

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

1. In studied corrosion processes:
   1. a gas is released only the corrosion of zinc;
   2. the metal it changes its oxidation state becoming an cation;
   3. a gas is released only the corrosion of aluminum;
   4. the metal it changes its oxidation state becoming an anion;
   
   
2. The zinc plate:
   1. the surface is measured before and after immersing it in H₂SO₄;
   2. the mass is measured before and after immersing it in H₂SO₄;
   3. was involved in the gravimetric 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;
   
   
3. The aluminum plate:
   1. was involved in the gravimetric method of corrosion analysis
   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. was involved in the volumetric method of corrosion analysis
   
   
4. Which of the following reactions may be called as of corrosion:
   1. Al₂O₃ + NaOH -> NaAlO₂
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. Fe₂O₃ + CO -> Fe + CO₂
   
   
5. Corrosion of metals:
   1. is the destruction of metals under the action of external factors;
   2. is helping in the process of cleaning the metals surfaces;
   3. can be reduced by electroplating;
   4. is the protection in time to chemical agents;
   
   

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

1. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea zincului;
   2. metalul isi schimba starea de oxidare pentru a deveni un cation;
   3. un gaz este eliberat numai la corodarea aluminiului;
   4. metalul isi schimba starea de oxidare pentru a deveni un anion;
   5. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   
   
2. Pentru placa de zinc:
   1. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   2. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   3. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   5. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   
3. Pentru placa de aluminiu:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   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. a fost implicata īn metoda volumetrica de analiza a coroziunii
   5. suprafata se masoara īnainte si dupa imersia īn NaOH;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Al₂O₃ + NaOH -> NaAlO₂
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. Fe₂O₃ + CO -> Fe + CO₂
   5. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   
   
5. Coroziunea metalelor:
   1. este distrugerea metalelor sub actiunea factorilor externi;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. poate fi redusa prin galvanizare;
   4. este protectia de durata impotriva agentilor chimici;
   5. are loc pur si simplu prin expunerea la umiditate īn aer;
   
   

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. is improved by salts additions;
   
   
2. It is expected to have a mass of nickel deposited:
   1. much higher than the calculated theoretical one;
   2. higher than the calculated theoretical one;
   3. proportional with the nickel plating time;
   4. inversely proportional with the nickel plating time;
   
   
3. The intensity of the current:
   1. should be adjusted by the technicians, we have nothing to do there;
   2. is to be calculated after conducting the experiment;
   3. is to be calculated before to start the experiment;
   4. is to be adjusted when the experiment starts;
   
   
4. Theoretical mass of nickel deposited is calculated using:
   1. perfect gas law;
   2. the conservation of the energy law;
   3. law of mass action;
   4. solutions laws;
   
   
5. At the nickel plating following reactions took place:
   1. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   2. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   3. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   4. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   
   

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. Theoretical mass of nickel deposited is calculated using:
   1. perfect gas law;
   2. solutions laws;
   3. law of mass action;
   4. the electrolysis law;
   
   
2. The intensity of the current:
   1. does not affect the quality nor the quantity of the nickel deposition;
   2. affect only the quantity of the nickel deposition;
   3. affect only the quality of the nickel deposition;
   4. is to be adjusted when the experiment starts;
   
   
3. At the nickel plating following reactions took place:
   1. at cathode (-), connected with metallic 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 anode (+), connected with nickel 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
   
   
4. It is expected to have a mass of nickel deposited:
   1. much higher than the calculated theoretical one;
   2. higher than the calculated theoretical one;
   3. proportional with the intensity of the current used;
   4. inversely proportional with the intensity of the current used;
   
   
5. Electrical conductivity of nickel salts solutions:
   1. is reduced by salts additions;
   2. is relatively small;
   3. is relatively high;
   4. depends on the intensity of the current used;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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