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

1. The position of the ring in the experiment is dependent on:
   1. the 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 not of the width of the tube;
   4. the propagation of the species as ions and not as neutral molecules;
   
   
2. We may say the followings:
   1. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   2. the molecules have energy in all gaseous, liquid and solid states;
   3. diffusion process appears only in gaseous state;
   4. the molecules have energy only in gaseous state;
   
   
3. The time to the formation 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 average energy or average speed of each involved species;
   4. the length of the tube and not of the width of the tube;
   
   
4. The chronometer is used in the experiment for:
   1. measuring of the diffusion time;
   2. indication of the moment when we should pay attention to the experiment;
   3. synchronization of the diffusion times;
   4. to keep us busy;
   
   
5. At the ends of the tube following equilibrium reactions occurs:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + HCl \=\ NH₄Cl
   4. H⁺ + HO^- \=\ H₂O
   
   

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

1. Pozitia 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 nu latimea tubului;
   4. propagarea speciilor ca ionii si nu ca si molecule neutre;
   5. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   
   
2. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   2. moleculele au energie īn toate starile gazoasa, lichida si solida;
   3. proces de difuzie apare numai īn stare gazoasa;
   4. moleculele au energie numai īn stare gazoasa;
   5. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   
   
3. Timpul pentru formarea 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. energia medie sau viteza medie a fiecarei specii implicate;
   4. lungimea tubului si nu latimea tubului;
   5. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   
   
4. Cronometrul este utilizat īn experimentul pentru:
   1. masurarea timpului de difuzie;
   2. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   3. sincronizarea timpilor de difuzie;
   4. sa ne tina ocupati;
   
   
5. La capetele tubului urmatoarele reactii de echilibru apar:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + HCl \=\ NH₄Cl
   4. H⁺ + HO^- \=\ H₂O
   
   

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

1. The time to the formation of the ring in the experiment is dependent on:
   1. the average energy or average speed of each involved species;
   2. the mode energy or mode speed of each involved species;
   3. the speed of diffusion of each involved species;
   4. the width of the tube and not of the length of the tube;
   
   
2. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory or our breathing;
   2. our experiment designed to trap the product of the reaction;
   3. formation of ammonium chloride;
   4. presence of the ammonia;
   
   
3. We may say the followings:
   1. the kinetic energy of a molecule is affected by temperature and pressure;
   2. the molecules have energy only in gaseous and liquid states;
   3. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   4. the kinetic energy of a molecule is affected by temperature only;
   
   
4. 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. indication of the moment when we should pay attention to the experiment;
   4. to keep us busy;
   
   
5. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all are moving in an arbitrary direction;
   2. all have same energy;
   3. all are moving in the same direction;
   4. are considered to be at the same temperature, but may have different speeds;
   
   

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

1. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. energia medie sau viteza medie a fiecarei specii implicate;
   2. viteza la moda sau energia la moda a fiecarei specii implicate;
   3. viteza de difuzie a fiecarei specii implicate;
   4. latimea tubului si nu lungimea tubului;
   5. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   
   
2. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   2. experimentului nostru proiectat pentru a captura produsul de reactie;
   3. formarea clorurii de amoniu;
   4. prezentei amoniacului;
   
   
3. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. energia cinetica a unei molecule este afectata de temperatura si presiune;
   2. moleculele au energie numai īn stare gazoasa si lichida;
   3. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   4. energia cinetica a unei molecule este afectata de numai temperatura;
   5. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   
   
4. Cronometrul este utilizat īn experimentul pentru:
   1. sincronizarea timpilor de difuzie;
   2. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   3. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   4. sa ne tina ocupati;
   5. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   
   
5. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate se īndreapta īntr-o directie arbitrara;
   2. toate au aceeasi energie;
   3. toate se deplaseaza īn aceeasi directie;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   5. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   
   

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. formation of ammonium chloride;
   2. presence of the chlorine;
   3. our experiment designed to trap the product of the reaction;
   4. presence of the ammonia;
   
   
2. The chronometer is used in the experiment for:
   1. measuring of the diffusion time;
   2. indication of the moment when we should pay attention to the experiment;
   3. extracting the information necessary to calculate the diffusion coefficients;
   4. synchronization of the diffusion times;
   
   
3. At the ends of the tube following equilibrium reactions occurs:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
4. The time to the formation of the ring in the experiment is dependent on:
   1. the length of the tube and not of the width of the tube;
   2. the virtual speeds and not the real speeds of each involved species;
   3. the propagation of the species as neutral molecules and not as ions;
   4. the propagation of the species as ions and not as neutral molecules;
   
   
5. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all have same speed;
   2. all are moving in an arbitrary direction;
   3. are considered to be at the same temperature, but may have different energies;
   4. all have same energy;
   
   

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

1. Ceata observata īn timpul experimentului se datoreaza:
   1. formarea clorurii de amoniu;
   2. prezentei clorului;
   3. experimentului nostru proiectat pentru a captura produsul de reactie;
   4. prezentei amoniacului;
   5. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   
   
2. Cronometrul este utilizat īn experimentul pentru:
   1. masurarea timpului de difuzie;
   2. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   3. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   4. sincronizarea timpilor de difuzie;
   
   
3. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
4. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. lungimea tubului si nu latimea tubului;
   2. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   3. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   4. propagarea speciilor ca ionii si nu ca si molecule neutre;
   5. viteza la moda sau energia la moda a fiecarei specii implicate;
   
   
5. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate au aceeasi viteza;
   2. toate se īndreapta īntr-o directie arbitrara;
   3. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   4. toate au aceeasi energie;
   
   

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

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

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

1. Pozitia inelului īn experimentul este dependenta de:
   1. concentratiile solutiilor utilizate;
   2. latimea tubului si nu lungimea tubului;
   3. lungimea tubului si latimea tubului;
   4. viteza de difuzie a fiecarei specii implicate;
   5. lungimea tubului si nu latimea tubului;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H₂O \=\ H⁺ + HO^-
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. NH₃ + HCl \=\ NH₄Cl
   
   
3. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   2. prezentei clorului;
   3. prezentei amoniacului;
   4. formarea clorurii de amoniu;
   5. experimentului nostru proiectat pentru a captura produsul de reactie;
   
   
4. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   2. moleculele au energie numai īn stare gazoasa;
   3. energia cinetica a unei molecule este afectata de numai temperatura;
   4. moleculele au viteze numai īn stare gazoasa si lichida;
   
   
5. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   2. viteza de difuzie a fiecarei specii implicate;
   3. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   4. energia medie sau viteza medie a fiecarei specii implicate;
   
   

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 or our breathing;
   2. presence of the ammonia;
   3. our experiment designed to trap the product of the reaction;
   4. presence of the chlorine;
   
   
2. 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. all are moving in the same direction;
   3. are considered to be at the same temperature, but may have different speeds;
   4. all have same energy;
   
   
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 virtual speeds and not the real speeds of each involved species;
   4. the mode energy or mode speed of each involved species;
   
   
4. We may say the followings:
   1. the molecules have speeds only in gaseous state;
   2. the molecules have speeds in all gaseous, liquid and solid states;
   3. the kinetic energy of a molecule is affected by temperature and pressure;
   4. diffusion process appears only in gaseous and liquid states;
   
   
5. The position 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 length of the tube and not of the width of the tube;
   
   

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 sau respiratie noastre;
   2. prezentei amoniacului;
   3. experimentului nostru proiectat pentru a captura produsul de reactie;
   4. prezentei clorului;
   
   
2. 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. toate se deplaseaza īn aceeasi directie;
   3. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   4. toate au aceeasi energie;
   5. toate se īndreapta īntr-o directie arbitrara;
   
   
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. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   4. viteza la moda sau energia la moda a fiecarei specii implicate;
   5. energia medie sau viteza medie a fiecarei specii implicate;
   
   
4. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au viteze numai īn stare gazoasa;
   2. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   3. energia cinetica a unei molecule este afectata de temperatura si presiune;
   4. proces de difuzie apare numai īn stare gazoasa si lichida;
   
   
5. Pozitia 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. lungimea tubului si nu latimea tubului;
   5. energia medie sau viteza medie a fiecarei specii implicate;
   
   

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

1. In the laboratory were studied:
   1. the producing of some gas as result of a lost of the mass of a solid;
   2. the lost of the mass of a solid as result of producing of some gas;
   3. increasing of the pressure of a gas when was heated;
   4. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   
   
2. A state equation for a real gas is:
   1. a relation derived to approximate the relation between state parameters;
   2. a relation obtained after conducting of the experiment;
   3. a relation which may involve some constants dependent of gas composition;
   4. a relation which is always true, independent of the values of the state parameters;
   
   
3. The values taken from the experiment conducted in the laboratory indicated that:
   1. oxigen were released as result of the decomposition;
   2. ozone were released as result of the decomposition;
   3. we do not possess enough information to decide what gas was released from the reaction;
   4. the ideal model of a gas approximated the best the behavior of the released gas;
   
   
4. For gaseous state:
   1. the pressure is subject to change when a chemical reaction occurs;
   2. the pressure is much lower than in liquid state;
   3. the pressure is unchanged when a chemical reaction occurs;
   4. the pressure depends on the model which are used to approximate it;
   
   
5. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. Ag₂O -> Ag + O₂;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. distillation of the liquid air;
   4. KNO₂ + O₂ -> KNO₃;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Īn laborator s-au studiat:
   1. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   2. pierdut din masa de solid ca urmare a producerii unor gaze;
   3. cresterea presiunii unui gaz cānd s-a īncalzit;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   5. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   
   
2. O ecuatie de stare pentru un gaz real este:
   1. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   2. o relatie obtinut dupa efectuarea experimentului;
   3. o relatie care poate implica unele constante dependente de compozitia gazului;
   4. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   
   
3. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. oxigenul au fost eliberat ca urmare a descompunerii;
   2. ozonul au fost eliberat ca urmare a descompunerii;
   3. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   4. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   5. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   
   
4. Pentru stare gazoasa:
   1. presiunea se pot modifica atunci cānd apare o reactie chimica;
   2. presiunea este mult mai mica decāt īn stare lichida;
   3. presiunea este neschimbata cānd apare o reactie chimica;
   4. presiunea depinde de modelul care este utilizat pentru o aproxima;
   
   
5. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. Ag₂O -> Ag + O₂;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. distilarea aerului lichid;
   4. KNO₂ + O₂ -> KNO₃;
   5. Ag + O₂ -> Ag₂O;
   
   

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

1. For gaseous state:
   1. the pressure depends on the model which are used to approximate it;
   2. the pressure is much higher than in liquid state;
   3. it exists an equation for all, p · V = n · R · T;
   4. the pressure is subject to change when a chemical reaction occurs;
   
   
2. In the laboratory were studied:
   1. increasing of the pressure of a gas when was heated;
   2. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   3. increasing of the temperature of a solid mass when was heated;
   4. the lost of the mass of a solid as result of producing of some gas;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KNO₂ + O₂ -> KNO₃;
   2. Ag + O₂ -> Ag₂O;
   3. opening a bubble water bottle;
   4. Ag₂O -> Ag + O₂;
   
   
4. A state equation for a real gas is:
   1. a relation which takes into account certain deviations from the ideal model;
   2. a relation between an certain number of state parameters;
   3. a relation derived to approximate the relation between state parameters;
   4. a relation between an unlimited number of state parameters;
   
   
5. The values taken from the experiment conducted in the laboratory indicated that:
   1. oxigen were released as result of the decomposition;
   2. ozone were released as result of the decomposition;
   3. air were released as result of the decomposition;
   4. the ideal model of a gas approximated the best the behavior of the released gas;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pentru stare gazoasa:
   1. presiunea depinde de modelul care este utilizat pentru o aproxima;
   2. presiunea este mult mai mare decāt īn stare lichida;
   3. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   4. presiunea se pot modifica atunci cānd apare o reactie chimica;
   
   
2. Īn laborator s-au studiat:
   1. cresterea presiunii unui gaz cānd s-a īncalzit;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   3. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   4. pierdut din masa de solid ca urmare a producerii unor gaze;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KNO₂ + O₂ -> KNO₃;
   2. Ag + O₂ -> Ag₂O;
   3. deschiderea unei sticle de apa cu bule;
   4. Ag₂O -> Ag + O₂;
   5. KCl + O₂ -> KClO₃;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   2. o relatie īntre un anumit numar de parametri de stare;
   3. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   4. o relatie īntre un numar nelimitat de parametri de stare;
   
   
5. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. oxigenul au fost eliberat ca urmare a descompunerii;
   2. ozonul au fost eliberat ca urmare a descompunerii;
   3. aer a fost eliberat ca urmare a descompunerii;
   4. 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. 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 derived to approximate the relation between state parameters;
   3. usable in the laboratory, but is not to be used somewhere else;
   4. a relation between an certain number of state parameters;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. we do not 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;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KClO₃ -> KCl + O₂;
   2. opening a bubble water bottle;
   3. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   4. distillation of the liquid air;
   
   
4. For gaseous state:
   1. it exists an equation for all, p · V = n · R · T;
   2. the pressure is approximately the same as in liquid state;
   3. the pressure is unchanged when a chemical reaction occurs;
   4. the pressure is much higher than in liquid state;
   
   
5. 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 ozone is released;
   3. increasing of the temperature of a solid mass when was heated;
   4. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. 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 derivata pentru a aproxima relatia dintre parametrii de stare;
   3. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   4. o relatie īntre un anumit numar de parametri de stare;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. nu 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;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KClO₃ -> KCl + O₂;
   2. deschiderea unei sticle de apa cu bule;
   3. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   4. distilarea aerului lichid;
   5. KNO₂ + O₂ -> KNO₃;
   
   
4. Pentru stare gazoasa:
   1. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   2. presiunea este aproximativ aceeasi ca si īn stare lichida;
   3. presiunea este neschimbata cānd apare o reactie chimica;
   4. presiunea este mult mai mare decāt īn stare lichida;
   
   
5. 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 ozonul este eliberat;
   3. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   5. cresterea presiunii unui gaz cānd s-a īncalzit;
   
   

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

1. In the laboratory were studied:
   1. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   2. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   3. increasing of the temperature of a solid mass when was heated;
   4. the producing of some gas as result of a lost of the mass of a solid;
   
   
2. A state equation for a real gas is:
   1. a relation obtained after conducting of the experiment;
   2. usable in the laboratory, but is not to be used somewhere else;
   3. a relation between an certain number of state parameters;
   4. a relation derived to approximate the relation between state parameters;
   
   
3. For gaseous state:
   1. the pressure depends on the model which are used to approximate it;
   2. the pressure is approximately the same as in liquid state;
   3. it exists an equation for all, p · V = n · R · T;
   4. the pressure is exactly the same as in liquid state;
   
   
4. 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. ozone were released as result of the decomposition;
   3. air were released as result of the decomposition;
   4. we do not possess enough information to decide what gas was released from the reaction;
   
   
5. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KClO₃ -> KCl + O₂;
   2. KNO₂ + O₂ -> KNO₃;
   3. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   4. opening a bubble water bottle;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Īn laborator s-au studiat:
   1. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   2. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   3. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   4. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   5. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   
   
2. O ecuatie de stare pentru un gaz real este:
   1. o relatie obtinut dupa efectuarea experimentului;
   2. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   3. o relatie īntre un anumit numar de parametri de stare;
   4. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   
   
3. Pentru stare gazoasa:
   1. presiunea depinde de modelul care este utilizat pentru o aproxima;
   2. presiunea este aproximativ aceeasi ca si īn stare lichida;
   3. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   4. presiunea este exact la fel ca si īn stare lichida;
   5. presiunea este mult mai mica decāt īn stare lichida;
   
   
4. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   2. ozonul au fost eliberat ca urmare a descompunerii;
   3. aer a fost eliberat ca urmare a descompunerii;
   4. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   5. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   
   
5. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KClO₃ -> KCl + O₂;
   2. KNO₂ + O₂ -> KNO₃;
   3. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   4. deschiderea unei sticle de apa cu bule;
   5. H₂O₂ -> H₂O + O₂;
   
   

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

1. A state equation for a real gas is:
   1. a relation derived to approximate the relation between state parameters;
   2. a relation which takes into account certain deviations from the ideal model;
   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;
   
   
2. In the laboratory were studied:
   1. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   2. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   3. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   4. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KClO₃ -> KCl + O₂;
   2. KNO₃ -> KNO₂ + O₂;
   3. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   4. opening a bubble water bottle;
   
   
4. 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. we do not possess enough information to decide what gas was released from the reaction;
   4. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   
   
5. For gaseous state:
   1. the pressure depends on the model which are used to approximate it;
   2. the pressure is much lower than in liquid state;
   3. the pressure is much higher than in liquid state;
   4. it exists an equation for all, p · V = n · R · T;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   2. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   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. o relatie obtinut dupa efectuarea experimentului;
   
   
2. Īn laborator s-au studiat:
   1. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   3. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KClO₃ -> KCl + O₂;
   2. KNO₃ -> KNO₂ + O₂;
   3. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   4. deschiderea unei sticle de apa cu bule;
   
   
4. 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. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   4. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   
   
5. Pentru stare gazoasa:
   1. presiunea depinde de modelul care este utilizat pentru o aproxima;
   2. presiunea este mult mai mica decāt īn stare lichida;
   3. presiunea este mult mai mare decāt īn stare lichida;
   4. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When aluminum is identified:
   1. is identified as Al¹⁺ cation;
   2. the presence of other ions may produce a true negative outcome;
   3. supplementary precautions should be taken, because the plates are made from aluminum too;
   4. using of alizarin along with ammonium hidroxide provide a red colored complex;
   
   
2. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
3. This method of analysis of metals and alloys is:
   1. useful for alloys, not so useful for metals;
   2. too ancient to be used today in the laboratory;
   3. a nondestructive method of analysis;
   4. a destructive method of analysis;
   
   
4. The paper requires before analysis of the sample:
   1. to be burned;
   2. to be dry;
   3. to be cut in small pieces;
   4. to be acidified;
   
   
5. When the electrical circuit is closed:
   1. water dissociation is inhibited;
   2. elements from the metals are passed into solution as anions;
   3. surface of the sample is fastly covered by a protecting shield of electrons;
   4. electric current avoids the sample and the paper;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd aluminiu este identificat:
   1. este identificat ca cationul Al¹⁺;
   2. prezenta altor ioni poate produce un rezultat adevarat negativ;
   3. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   4. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   5. este identificat ca cationul Al²⁺;
   
   
2. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
3. Aceasta metoda de analiza de metale si aliaje este:
   1. utila pentru aliaje, nu atāt de utila pentru metale;
   2. prea veche pentru a fi utilizata īn prezent īn laborator;
   3. o metoda nedistructiva de analiza;
   4. o metoda distructiva de analiza;
   5. o metoda cantitativa de analiza;
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa fie arsa;
   2. sa fie uscata;
   3. sa fie taiata īn bucati mici;
   4. sa fie acidulata;
   5. sa fie umezita cu un electrolit;
   
   
5. Cānd circuitul electric este īnchis:
   1. disocierea apei este inhibata;
   2. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   3. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   4. curent electric evita proba si hārtia;
   5. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When lead is identified:
   1. precautions should be made for toxic wastes disposal;
   2. interference of other ions may affect the outcome;
   3. a blue complex appears;
   4. dangerous substances are used;
   
   
2. This method of analysis of metals and alloys is:
   1. a quantitative method of analysis;
   2. a nondestructive method of analysis;
   3. a destructive method of analysis;
   4. useful for both metals and alloys;
   
   
3. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   
   
4. 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 have something to do in the laboratory;
   3. to be cut easily with scissors;
   4. for the paper to work as isolator;
   
   
5. The paper requires before analysis of the sample:
   1. to be moistened with an electrolyte;
   2. to be cut in small pieces;
   3. to be dry;
   4. to be weighted;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd plumbul este identificat:
   1. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   2. interferenta altor ioni poate afecta rezultatul;
   3. apare un complex albastru;
   4. sunt utilizate substante periculoase;
   
   
2. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda cantitativa de analiza;
   2. o metoda nedistructiva de analiza;
   3. o metoda distructiva de analiza;
   4. utila atāt pentru metale si aliaje;
   
   
3. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   5. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
4. 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. pentru a avea ceva de a face īn laborator;
   3. sa fie taiat cu usurinta cu foarfeca;
   4. pentru ca hartia sa actioneze ca izolator;
   5. pentru furniza cationi pentru analiza;
   
   
5. Hartia necesita ca īnainte de analiza probei:
   1. sa fie umezita cu un electrolit;
   2. sa fie taiata īn bucati mici;
   3. sa fie uscata;
   4. sa fie cantarita;
   5. sa i se masoare suprafata;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. useful for both metals and alloys;
   2. not useful for both metals and alloys;
   3. a quantitative method of analysis;
   4. useful for pure metals, not so useful for alloys;
   
   
2. When aluminum is identified:
   1. the presence of other ions may produce a true negative outcome;
   2. is identified as Al²⁺ cation;
   3. using of alizarin along with ammonium hidroxide provide a more selective indication about the presence of aluminum;
   4. there are many identification reactions possible;
   
   
3. When the electrical circuit is closed:
   1. cations from the solution are passed into sample as metals;
   2. elements from the solution are passed into sample as metals;
   3. elements from the metals are passed into solution as anions;
   4. water dissociation is inhibited;
   
   
4. When lead is identified:
   1. the reactions used clearly indicates its presence;
   2. dangerous substances are used;
   3. interference of other ions may affect the outcome;
   4. a heat release is observed;
   
   
5. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   2. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   3. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. utila atāt pentru metale si aliaje;
   2. nu este utila nici pentru metale nici pentru aliaje;
   3. o metoda cantitativa de analiza;
   4. utila pentru metale pure, nu atāt de utila pentru aliaje;
   
   
2. Cānd aluminiu este identificat:
   1. prezenta altor ioni poate produce un rezultat adevarat negativ;
   2. este identificat ca cationul Al²⁺;
   3. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un indiciu mai selectiv cu privire la prezenta aluminiului;
   4. exista multe reactii posibile de identificare;
   
   
3. Cānd circuitul electric este īnchis:
   1. cationii din solutie sunt trecuti īn proba ca metale;
   2. elemente din solutie sunt trecute īn proba ca metale;
   3. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   4. disocierea apei este inhibata;
   5. anionii din solutie sunt trecuti īn proba ca metale;
   
   
4. Cānd plumbul este identificat:
   1. reactiile utilizate īn mod clar ii indica prezenta;
   2. sunt utilizate substante periculoase;
   3. interferenta altor ioni poate afecta rezultatul;
   4. se observa o eliberare de caldura;
   
   
5. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   2. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   3. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   5. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. not useful for both metals and alloys;
   2. a gravimetric method of analysis;
   3. useful for both metals and alloys;
   4. useful for pure metals, not so useful for alloys;
   
   
2. 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. for stopping after a while the chemical reaction that takes place;
   3. to accomodate ourselves to use chemicals;
   4. to provide cations for analysis;
   
   
3. When aluminum is identified:
   1. only one identification reaction is possible;
   2. using of alizarin along with ammonium hidroxide provide a red colored complex;
   3. the presence of other ions may produce a false negative outcome;
   4. supplementary precautions should be taken, because the plates are made from aluminum too;
   
   
4. The electric charges after passing the metals into solution may be:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   3. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   
   
5. When lead is identified:
   1. a heat release is observed;
   2. dangerous substances are used;
   3. interference of other ions may affect the outcome;
   4. a blue complex appears;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. nu este utila nici pentru metale nici pentru aliaje;
   2. o metoda gravimetrica de analiza;
   3. utila atāt pentru metale si aliaje;
   4. utila pentru metale pure, nu atāt de utila pentru aliaje;
   
   
2. 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. pentru oprirea dupa un timp reactiei chimice care are loc;
   3. sa ne acomodam in a utiliza substante chimice;
   4. pentru furniza cationi pentru analiza;
   5. pentru a avea ceva de a face īn laborator;
   
   
3. Cānd aluminiu este identificat:
   1. doar o reactie de identificare este posibila;
   2. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   3. prezenta altor ioni poate produce un rezultat fals negativ;
   4. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   
   
4. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   3. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   
   
5. Cānd plumbul este identificat:
   1. se observa o eliberare de caldura;
   2. sunt utilizate substante periculoase;
   3. interferenta altor ioni poate afecta rezultatul;
   4. apare un complex albastru;
   5. apare un complex violet;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. 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 cut in small pieces;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. to provide cations for analysis;
   2. for the paper to work as isolator;
   3. to be cut easily with scissors;
   4. to accomodate ourselves to use chemicals;
   
   
3. When aluminum is identified:
   1. there are many identification reactions possible;
   2. using of ammonium hidroxide is enough in order to have a clear guess about the presence of aluminum;
   3. the presence of other ions may produce a false negative outcome;
   4. supplementary precautions should be taken, because the plates are made from aluminum too;
   
   
4. When lead is identified:
   1. interference of other ions may affect the outcome;
   2. the reactions used clearly indicates its presence;
   3. a red-brown complex appears;
   4. precautions should be made for toxic wastes disposal;
   
   
5. When the electrical circuit is closed:
   1. elements from the metals are passed into solution as cations;
   2. elements from the metals are passed into solution as anions;
   3. elements from the solution are passed into sample as metals;
   4. cations from the solution are passed into sample as metals;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. 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 taiata īn bucati mici;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru furniza cationi pentru analiza;
   2. pentru ca hartia sa actioneze ca izolator;
   3. sa fie taiat cu usurinta cu foarfeca;
   4. sa ne acomodam in a utiliza substante chimice;
   5. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   
   
3. Cānd aluminiu este identificat:
   1. exista multe reactii posibile de identificare;
   2. folosirea hidroxidului de amoniu este suficient pentru a avea indicii clare cu privire la prezenta aluminiului;
   3. prezenta altor ioni poate produce un rezultat fals negativ;
   4. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   
   
4. Cānd plumbul este identificat:
   1. interferenta altor ioni poate afecta rezultatul;
   2. reactiile utilizate īn mod clar ii indica prezenta;
   3. apare un complex rosu-brun;
   4. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   
   
5. Cānd circuitul electric este īnchis:
   1. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   2. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   3. elemente din solutie sunt trecute īn proba ca metale;
   4. cationii din solutie sunt trecuti īn proba ca metale;
   5. curent electric evita proba si hārtia;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. When a chemical reaction is balanced, following should be considered:
   1. all glassware should be clean before, after and during the experiment;
   2. the principle of the conservation of the volume;
   3. the principle of the conservation of the number of atoms for each element;
   4. the principle of the conservation of the energy;
   
   
2. The equivalence point is:
   1. the point in which a reactive is fully consumed in the reaction;
   2. used to balance the equation;
   3. something rarely encountered in chemistry;
   4. indicated when a color change is observed into the solution;
   
   
3. A redox process:
   1. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. occurs only when we mix wrong substances in the laboratory;
   3. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. involves a transfer of electrons from one atom or group of atoms to another;
   
   
4. Titration as a laboratory operation involves:
   1. a pH indicator that changes color depending on the pH of the solution;
   2. an mixing of two ore more solutions;
   3. a volume measurement;
   4. a pH-metter;
   
   
5. The density of the solutions depends on:
   1. time elapsed since were prepared;
   2. provider;
   3. temperature;
   4. quantity;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   2. principiul conservarii volumului;
   3. principiul conservarii numarul de atomi pentru fiecare element;
   4. principiul conservarii energiei;
   
   
2. Punctul de echivalenta este:
   1. punctul īn care un reactiv este consumat complet īn reactie;
   2. folosit pentru a echilibra ecuatia;
   3. ceva rar īntālnit īn chimie;
   4. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   
   
3. Un proces redox:
   1. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. apare numai atunci cānd se amesteca substante gresit īn laborator;
   3. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   
   
4. Titrarea ca o operatiune de laborator implica:
   1. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   2. amestecul a doua sau mai multe solutii;
   3. masurarea volumului;
   4. un pH-metru;
   5. un standard sau reactiv de referinta;
   
   
5. Densitatea solutiilor depinde de:
   1. timpul scurs de cand au fost pregatite;
   2. furnizor;
   3. temperatura;
   4. cantitate;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. When a chemical reaction is balanced, following should be considered:
   1. all glassware should be clean before and after conducting the experiment;
   2. all glassware should be clean before, after and during the experiment;
   3. the principle of the conservation of the number of atoms for each element;
   4. the principle of the conservation of the volume;
   
   
2. The following chemical reactions were used in the experiments:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   
   
3. Reactions between acids and bases:
   1. have as effect the change of the color of a solution;
   2. are all exothermic, being therefore dangerous outside of the laboratory;
   3. are rarely useful, and even rarely used;
   4. always have as a consequence the formation of a quantity of water;
   
   
4. A redox process:
   1. involves a transfer of electrons from one atom or group of atoms to another;
   2. involves changing of the oxidation states of some participants to the reaction;
   3. is always fast and safe;
   4. is considered to be the following one: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
5. Titration as a laboratory operation involves:
   1. a volume measurement;
   2. a mass measurement;
   3. a standard or referential reactive;
   4. a sulphuric acid solution;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   2. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   3. principiul conservarii numarul de atomi pentru fiecare element;
   4. principiul conservarii volumului;
   
   
2. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   
   
3. Reactiile īntre acizi si baze:
   1. au ca efect schimbarea culorii unei solutii;
   2. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   3. sunt rareori utile, si chiar mai rar utilizate;
   4. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   
   
4. Un proces redox:
   1. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   2. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   3. este īntotdeauna rapid si sigur;
   4. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   5. apare numai atunci cānd se amesteca substante gresit īn laborator;
   
   
5. Titrarea ca o operatiune de laborator implica:
   1. masurarea volumului;
   2. masurarea masei;
   3. un standard sau reactiv de referinta;
   4. o solutie de acid sulfuric;
   5. amestecul a doua sau mai multe solutii;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. In the calculations:
   1. are necessary to take some information from reagent bottles;
   2. are necessary to discuss with our colleagues;
   3. are necessary to use our phones;
   4. are necessary to take the results imediatly after these are available from others;
   
   
2. The density of the solutions depends on:
   1. provider;
   2. pressure;
   3. concentration;
   4. quantity;
   
   
3. The indicator should be added:
   1. to indicate our safety limits when we dealt with chemicals;
   2. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   3. to provide a color change at equivalence point;
   4. in small quantities, to avoid the errors in observations and in calculations;
   
   
4. The equivalence point is:
   1. used to balance the equation;
   2. indicated when a color change is observed into the solution;
   3. the point in which a reactive should be added in the burette;
   4. the point in which a reactive is fully consumed in the reaction;
   
   
5. The following chemical reactions were used in the experiments:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. H₂O + CO₂ -> H₂CO₃
   4. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. In calcule:
   1. este necesar a se lua unele informatii de pe sticlele de reactivi;
   2. este necesar sa discutam cu colegii;
   3. este necesar sa utilizam telefoanele;
   4. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   5. este necesara stabilirea coeficientilor reactiei chimice;
   
   
2. Densitatea solutiilor depinde de:
   1. furnizor;
   2. presiune;
   3. concentratie;
   4. cantitate;
   5. temperatura;
   
   
3. Trebuie adaugat indicatorul:
   1. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   2. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   3. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   4. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   5. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   
   
4. Punctul de echivalenta este:
   1. folosit pentru a echilibra ecuatia;
   2. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   3. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   4. punctul īn care un reactiv este consumat complet īn reactie;
   
   
5. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. H₂O + CO₂ -> H₂CO₃
   4. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   5. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Titration as a laboratory operation involves:
   1. a pH indicator that changes color depending on the pH of the solution;
   2. a volume measurement;
   3. a pH-metter;
   4. an mixing of two ore more solutions;
   
   
2. The density of the solutions depends on:
   1. pressure;
   2. quantity;
   3. concentration;
   4. temperature;
   
   
3. Reactions between acids and bases:
   1. always have as a consequence the formation of a quantity of water;
   2. are rarely useful, and even rarely used;
   3. are all exothermic, being therefore dangerous outside of the laboratory;
   4. have as a consequence the dissolution of a salt;
   
   
4. The indicator should be added:
   1. in large quantities, according to the principle 'only size matters';
   2. in small quantities, to avoid the errors in observations and in calculations;
   3. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   4. to indicate our safety limits when we dealt with chemicals;
   
   
5. A redox process:
   1. is always fast and safe;
   2. involves changing of the oxidation states of some participants to the reaction;
   3. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. is considered to be the following one: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Titrarea ca o operatiune de laborator implica:
   1. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   2. masurarea volumului;
   3. un pH-metru;
   4. amestecul a doua sau mai multe solutii;
   
   
2. Densitatea solutiilor depinde de:
   1. presiune;
   2. cantitate;
   3. concentratie;
   4. temperatura;
   
   
3. Reactiile īntre acizi si baze:
   1. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   2. sunt rareori utile, si chiar mai rar utilizate;
   3. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   4. au drept consecinta dizolvarea unei sari;
   
   
4. Trebuie adaugat indicatorul:
   1. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   2. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   3. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   4. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   
   
5. Un proces redox:
   1. este īntotdeauna rapid si sigur;
   2. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   3. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   5. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The density of the solutions depends on:
   1. time elapsed since were prepared;
   2. concentration;
   3. provider;
   4. pressure;
   
   
2. The indicator should be added:
   1. in small quantities, to avoid the errors in observations and in calculations;
   2. to provide a color change at equivalence point;
   3. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   4. to indicate our safety limits when we dealt with chemicals;
   
   
3. Reactions between acids and bases:
   1. always have as a consequence the formation of a quantity of water;
   2. are always fast, taking place almost instantaneously;
   3. are rarely useful, and even rarely used;
   4. have as effect the change of the color of a solution;
   
   
4. 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 and after conducting the experiment;
   3. the principle of the conservation of the energy;
   4. the liquid in the burette should be at the same level before and after conducting the experiment;
   
   
5. The following chemical reactions were used in the experiments:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Densitatea solutiilor depinde de:
   1. timpul scurs de cand au fost pregatite;
   2. concentratie;
   3. furnizor;
   4. presiune;
   5. temperatura;
   
   
2. Trebuie adaugat indicatorul:
   1. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   2. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   3. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   4. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   5. numai la sugestia supraveghetorului;
   
   
3. Reactiile īntre acizi si baze:
   1. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   2. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   3. sunt rareori utile, si chiar mai rar utilizate;
   4. au ca efect schimbarea culorii unei solutii;
   
   
4. 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 si dupa efectuarea experimentului;
   3. principiul conservarii energiei;
   4. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   5. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   
   
5. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   5. H₂O + CO₂ -> H₂CO₃
   
   

FINAL TEST AT LABORATORY
Water analysis

1. We may say the followings:
   1. natural water may contain organic matter and living organisms;
   2. water is a good polar solvent;
   3. when water contains dissolved minerals and gases is bad for drinking;
   4. water is pure only when is taken from a good freshwater mountain stream;
   
   
2. EDTA is used:
   1. as reagent for determining the hardness of the water;
   2. for complexing of Ca²⁺ and Mg²⁺ ions;
   3. for indication of the equilibrium point in the reaction;
   4. for safety precautions purposes;
   
   
3. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. total acidity;
   2. color;
   3. total alkalinity;
   4. permanent alkalinity;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Putem spune urmatoarele:
   1. apa naturala poate contine materie organica si organisme vii;
   2. apa este un solvent polar bun;
   3. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   4. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   
   
2. EDTA este utilizat:
   1. ca reactiv pentru determinarea duritatii apei;
   2. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   3. pentru indicarea punctului de echilibru īn reactie;
   4. ca masura de siguranta;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   5. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   5. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate totala;
   2. culoare;
   3. alcalinitate totala;
   4. alcalinitate permanenta;
   5. aciditate minerala;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   2. HCl + HO⁺ -> H₂O + Cl⁺
   3. HCl + CO₃^2- -> HCO₃^- + Cl^-
   4. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   
   
2. In the laboratory were analyzed:
   1. the alkalinity of the water;
   2. the hardness of the water;
   3. the boiling point of the water;
   4. the concentration of the water;
   
   
3. EDTA is used:
   1. for complexing of Na¹⁺ and K¹⁺ ions;
   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;
   
   
4. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   2. NaOH + Cl⁺ -> NaCl + HO⁺
   3. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   4. NaOH + Cl^- -> NaCl + HO^-
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. color;
   2. permanent alkalinity;
   3. total alkalinity;
   4. total acidity;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   2. HCl + HO⁺ -> H₂O + Cl⁺
   3. HCl + CO₃^2- -> HCO₃^- + Cl^-
   4. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   5. HCl + HO^- -> H₂O+Cl^-
   
   
2. Īn laborator au fost analizate:
   1. alcalinitatea apei;
   2. duritatea apei;
   3. punctul de fierbere al apei;
   4. concentratia apei;
   
   
3. EDTA este utilizat:
   1. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   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 +};
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   2. NaOH + Cl⁺ -> NaCl + HO⁺
   3. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   4. NaOH + Cl^- -> NaCl + HO^-
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. culoare;
   2. alcalinitate permanenta;
   3. alcalinitate totala;
   4. aciditate totala;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. In the laboratory the water were:
   1. acidified for drinking purposes;
   2. alkalinized for drinking purposes;
   3. hardened using the resin column;
   4. softened using the resin column;
   
   
2. For a water sample following measures may be quantitatively expressed:
   1. color;
   2. mineral acidity;
   3. total acidity;
   4. total alkalinity;
   
   
3. 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 + Cu²⁺ -> Cu(OH)₂ + Na⁺
   
   
4. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + HO^- -> H₂O + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   
5. In the laboratory were analyzed:
   1. the color of the water;
   2. the boiling point of the water;
   3. the alkalinity of the water;
   4. the concentration of the water;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. In laborator apa au fost:
   1. acidulata pentru baut;
   2. alcalinizeaza pentru baut;
   3. calita folosind coloana de rasina;
   4. dedurizata folosind coloana de rasina;
   5. purificata biologic utilizānd coloana de rasina;
   
   
2. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. culoare;
   2. aciditate minerala;
   3. aciditate totala;
   4. alcalinitate totala;
   5. duritate;
   
   
3. 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 + Cu²⁺ -> Cu(OH)₂ + Na⁺
   5. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + HO^- -> H₂O+Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   
5. Īn laborator au fost analizate:
   1. culoarea apei;
   2. punctul de fierbere al apei;
   3. alcalinitatea apei;
   4. concentratia apei;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. For a water sample following measures may be quantitatively expressed:
   1. color;
   2. mineral acidity;
   3. purity;
   4. total acidity;
   
   
2. EDTA is used:
   1. for indication of the equilibrium point in the reaction;
   2. for complexing of Na¹⁺ and K¹⁺ ions;
   3. as reagent for determining the hardness of the water;
   4. for recharging of the resin for water softening;
   
   
3. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + CO₃^2- -> HCO₃^- + Cl^-
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   
   
4. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Cl⁺ -> NaCl + HO⁺
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   4. NaOH + NO₃^- -> NaNO₃ + HO^-
   
   
5. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   2. NaOH + HCOO⁺ -> HCOONa + HO⁺
   3. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   4. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. culoare;
   2. aciditate minerala;
   3. puritate;
   4. aciditate totala;
   
   
2. EDTA este utilizat:
   1. pentru indicarea punctului de echilibru īn reactie;
   2. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   3. ca reactiv pentru determinarea duritatii apei;
   4. pentru reīncarcarea rasinii la dedurizarea apei;
   5. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + HO^- -> H₂O+Cl^-
   2. HCl + CO₃^2- -> HCO₃^- + Cl^-
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   5. HCl + HO⁺ -> H₂O + Cl⁺
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + Cl⁺ -> NaCl + HO⁺
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   4. NaOH + NO₃^- -> NaNO₃ + HO^-
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CO₃^2- -> HCO₃^- + HO^-
   2. NaOH + HCOO⁺ -> HCOONa + HO⁺
   3. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   4. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   5. NaOH + HCOO^- -> HCOONa + HO^-
   
   

FINAL TEST AT LABORATORY
Water analysis

1. For a water sample following measures may be quantitatively expressed:
   1. permanent alkalinity;
   2. total acidity;
   3. hardness;
   4. color;
   
   
2. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   2. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   3. NaOH + NO₃^- -> NaNO₃ + HO^-
   4. NaOH + Cl⁺ -> NaCl + HO⁺
   
   
3. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   3. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   4. HCl + HO^- -> H₂O + Cl^-
   
   
4. In the laboratory the water were:
   1. complexed by using EDTA titrimetric method;
   2. biologically purified using the resin column;
   3. hardened using the resin column;
   4. acidified for drinking purposes;
   
   
5. EDTA is used:
   1. for complexing of Ca²⁺ and Mg²⁺ ions;
   2. as reagent for determining the hardness of the water;
   3. for recharging of the resin for water softening;
   4. for complexing of Na¹⁺ and K¹⁺ ions;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. alcalinitate permanenta;
   2. aciditate totala;
   3. duritate;
   4. culoare;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   2. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   3. NaOH + NO₃^- -> NaNO₃ + HO^-
   4. NaOH + Cl⁺ -> NaCl + HO⁺
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   3. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   4. HCl + HO^- -> H₂O+Cl^-
   
   
4. In laborator apa au fost:
   1. complexata prin metoda titrimetrica EDTA;
   2. purificata biologic utilizānd coloana de rasina;
   3. calita folosind coloana de rasina;
   4. acidulata pentru baut;
   5. alcalinizeaza pentru baut;
   
   
5. EDTA este utilizat:
   1. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   2. ca reactiv pentru determinarea duritatii apei;
   3. pentru reīncarcarea rasinii la dedurizarea apei;
   4. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   5. ca masura de siguranta;
   
   

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

1. The zinc plate:
   1. was corroded in sulfuric solution;
   2. was degreased in sulfuric acid solution;
   3. the mass is measured before and after immersing it in H₂SO₄;
   4. the surface is measured before and after immersing it in H₂SO₄;
   
   
2. In studied corrosion processes:
   1. a gas is released at both corrosion of zinc and aluminum;
   2. the metal it changes its oxidation state becoming an anion;
   3. a gas is released only the corrosion of aluminum;
   4. a gas is released only the corrosion of zinc;
   
   
3. The aluminum plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. was involved in the volumetric method of corrosion analysis
   3. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. the volume is measured before and after immersing it in NaOH;
   
   
4. Corrosion of metals:
   1. is the protection in time to chemical agents;
   2. is a beneficial process that shows the stability of metals;
   3. may provide useful raw materials for analysis;
   4. is helping in the process of cleaning the metals surfaces;
   
   
5. Which of the following reactions may be called as of corrosion:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. ZnO + CO -> Zn + CO₂
   
   

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

1. Pentru placa de zinc:
   1. a fost corodata īn solutie sulfuric;
   2. a fost degresata īn solutie de acid sulfuric;
   3. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   4. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   5. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   
2. Īn procesele de coroziune studiate:
   1. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   2. metalul isi schimba starea de oxidare pentru a deveni un anion;
   3. un gaz este eliberat numai la corodarea aluminiului;
   4. un gaz este eliberat numai la corodarea zincului;
   
   
3. Pentru placa de aluminiu:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. a fost implicata īn metoda volumetrica de analiza a coroziunii
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. volumul se masoara īnainte si dupa imersia īn NaOH;
   5. a fost corodata īn solutie de hidroxid de sodiu;
   
   
4. Coroziunea metalelor:
   1. este protectia de durata impotriva agentilor chimici;
   2. este un proces benefic care arata stabilitatea metalelor;
   3. poate furniza materii prime utile pentru analiza;
   4. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   
   
5. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. ZnO + CO -> Zn + CO₂
   
   

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

1. The aluminum plate:
   1. was degreased in sodium hydroxide solution;
   2. was involved in the gravimetric method of corrosion analysis
   3. the volume is measured before and after immersing it in NaOH;
   4. the mass is measured before and after immersing it in NaOH;
   
   
2. Corrosion of metals:
   1. is helping in the process of cleaning the metals surfaces;
   2. can be reduced by passivation;
   3. may provide useful raw materials for analysis;
   4. takes place merely from exposure to moisture in air;
   
   
3. The zinc plate:
   1. the mass is measured before and after immersing it in H₂SO₄;
   2. the volume is measured before and after immersing it in H₂SO₄;
   3. was degreased in sulfuric acid solution;
   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. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Zn -> H₂ + Zn²⁺
   3. Ni(CO)₄ -> Ni + CO
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
5. In studied corrosion processes:
   1. a gas is released at both corrosion of zinc and aluminum;
   2. a gas is released only the corrosion of aluminum;
   3. always the metal changes its oxidation state;
   4. a gas is released only the corrosion of zinc;
   
   

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

1. Pentru placa de aluminiu:
   1. a fost degresata īn solutie de hidroxid de sodiu;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. volumul se masoara īnainte si dupa imersia īn NaOH;
   4. masa este masurata īnainte si dupa imersia īn NaOH;
   5. suprafata se masoara īnainte si dupa imersia īn NaOH;
   
   
2. Coroziunea metalelor:
   1. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   2. poate fi redusa prin pasivare;
   3. poate furniza materii prime utile pentru analiza;
   4. are loc pur si simplu prin expunerea la umiditate īn aer;
   5. poate fi redusa prin galvanizare;
   
   
3. Pentru placa de zinc:
   1. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   2. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   3. a fost degresata īn solutie de acid sulfuric;
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   5. a fost corodata īn solutie sulfuric;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Zn -> H₂ + Zn²⁺
   3. Ni(CO)₄ -> Ni + CO
   4. H⁺ + Ni -> H₂ + Ni²⁺
   5. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   
   
5. Īn procesele de coroziune studiate:
   1. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   2. un gaz este eliberat numai la corodarea aluminiului;
   3. īntotdeauna metalul isi schimba starea de oxidare;
   4. un gaz este eliberat numai la corodarea zincului;
   5. metalul isi schimba starea de oxidare pentru a deveni un anion;
   
   

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

1. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. when a gas is released its volume depends on the amount of metal corroded;
   3. the metal it changes its oxidation state becoming an anion;
   4. always the metal changes its oxidation state;
   
   
2. Corrosion of metals:
   1. takes place merely from exposure to moisture in air;
   2. may provide useful raw materials for analysis;
   3. can be reduced by passivation;
   4. can be reduced by electroplating;
   
   
3. The aluminum 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. the mass is measured before and after immersing it in NaOH;
   
   
4. The zinc plate:
   1. the surface is measured before and after immersing it in H₂SO₄;
   2. the volume is measured before and after immersing it in H₂SO₄;
   3. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. the mass is measured before and after immersing it in H₂SO₄;
   
   
5. Which of the following reactions may be called as of corrosion:
   1. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   2. H⁺ + Zn -> H₂ + Zn²⁺
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   

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

1. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   3. metalul isi schimba starea de oxidare pentru a deveni un anion;
   4. īntotdeauna metalul isi schimba starea de oxidare;
   
   
2. Coroziunea metalelor:
   1. are loc pur si simplu prin expunerea la umiditate īn aer;
   2. poate furniza materii prime utile pentru analiza;
   3. poate fi redusa prin pasivare;
   4. poate fi redusa prin galvanizare;
   5. este un proces benefic care arata stabilitatea metalelor;
   
   
3. Pentru placa de aluminiu:
   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. masa este masurata īnainte si dupa imersia īn NaOH;
   5. a fost degresata īn solutie de hidroxid de sodiu;
   
   
4. Pentru placa de zinc:
   1. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   2. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   5. a fost degresata īn solutie de acid sulfuric;
   
   
5. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   2. H⁺ + Zn -> H₂ + Zn²⁺
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   

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

1. The zinc plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. the volume is measured before and after immersing it in H₂SO₄;
   3. the mass is measured before and after immersing it in H₂SO₄;
   4. the surface is measured before and after immersing it in H₂SO₄;
   
   
2. The aluminum plate:
   1. the surface is measured before and after immersing it in NaOH;
   2. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   3. the mass is measured before and after immersing it in NaOH;
   4. was corroded in sodium hydroxide solution;
   
   
3. 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. is the protection in time to chemical agents;
   4. can be reduced by electroplating;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. ZnO + CO -> Zn + CO₂
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
5. 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 aluminum;
   3. a gas is released at both corrosion of zinc and aluminum;
   4. a gas is released only the corrosion of zinc;
   
   

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

1. Pentru placa de zinc:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   3. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   4. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   5. a fost degresata īn solutie de acid sulfuric;
   
   
2. Pentru placa de aluminiu:
   1. suprafata se masoara īnainte si dupa imersia īn NaOH;
   2. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   3. masa este masurata īnainte si dupa imersia īn NaOH;
   4. a fost corodata īn solutie de hidroxid de sodiu;
   
   
3. Coroziunea metalelor:
   1. este distrugerea metalelor sub actiunea factorilor externi;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. este protectia de durata impotriva agentilor chimici;
   4. poate fi redusa prin galvanizare;
   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. H⁺ + Ni -> H₂ + Ni²⁺
   2. ZnO + CO -> Zn + CO₂
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
5. 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 aluminiului;
   3. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   4. un gaz este eliberat numai la corodarea zincului;
   
   

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

1. Which of the following reactions may be called as of corrosion:
   1. Ni(CO)₄ -> Ni + CO
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
2. The zinc plate:
   1. the volume is measured before and after immersing it in H₂SO₄;
   2. was involved in the gravimetric method of corrosion analysis
   3. the mass is measured before and after immersing it in H₂SO₄;
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   
3. Corrosion of metals:
   1. is a beneficial process that shows the stability of metals;
   2. may provide useful raw materials for analysis;
   3. takes place merely from exposure to moisture in air;
   4. is helping in the process of cleaning the metals surfaces;
   
   
4. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. a gas is released only the corrosion of zinc;
   3. when a gas is released its volume depends on the amount of metal corroded;
   4. a gas is released only the corrosion of aluminum;
   
   
5. The aluminum plate:
   1. was corroded in sodium hydroxide solution;
   2. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   3. the surface is measured before and after immersing it in NaOH;
   4. was degreased in sodium hydroxide solution;
   
   

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

1. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Ni(CO)₄ -> Ni + CO
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
2. Pentru placa de zinc:
   1. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   
3. Coroziunea metalelor:
   1. este un proces benefic care arata stabilitatea metalelor;
   2. poate furniza materii prime utile pentru analiza;
   3. are loc pur si simplu prin expunerea la umiditate īn aer;
   4. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   
   
4. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. un gaz este eliberat numai la corodarea zincului;
   3. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   4. un gaz este eliberat numai la corodarea aluminiului;
   5. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   
   
5. Pentru placa de aluminiu:
   1. a fost corodata īn solutie de hidroxid de sodiu;
   2. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   3. suprafata se masoara īnainte si dupa imersia īn NaOH;
   4. a fost degresata īn solutie de hidroxid de sodiu;
   5. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   2. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   3. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   4. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the anode: O^2- - 2e^- -> O₂⁰
   
   
2. It is expected to have a mass of nickel deposited:
   1. proportional with the surface of the sample;
   2. proportional with the nickel plating time;
   3. inversely proportional with the surface of the sample;
   4. inversely proportional with the intensity of the current used;
   
   
3. Theoretical mass of nickel deposited is calculated using:
   1. the conservation of the energy law;
   2. the electrolysis law;
   3. the conservation of the number of atoms for each element law;
   4. law of mass action;
   
   
4. Electrical conductivity of nickel salts solutions:
   1. depends on the potential of the source used;
   2. is improved by salts additions;
   3. depends on the intensity of the current used;
   4. is relatively high;
   
   
5. The intensity of the current:
   1. should be adjusted by the technicians, we have nothing to do there;
   2. affect only the quality of the nickel deposition;
   3. affect only the quantity of the nickel deposition;
   4. does not affect the quality nor the quantity of the nickel deposition;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. 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 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
   
   
2. The intensity of the current:
   1. it depends on the surface of the sample;
   2. is to be adjusted when the experiment starts;
   3. affect only the quantity of the nickel deposition;
   4. affect only the quality of the nickel deposition;
   
   
3. It is expected to have a mass of nickel deposited:
   1. much lower than the calculated theoretical one;
   2. proportional with the nickel plating time;
   3. much higher than the calculated theoretical one;
   4. proportional with the intensity of the current used;
   
   
4. Electrical conductivity of nickel salts solutions:
   1. is improved by salts additions;
   2. depends on the intensity of the current used;
   3. is relatively high;
   4. is relatively small;
   
   
5. Theoretical mass of nickel deposited is calculated using:
   1. perfect gas law;
   2. the conservation of the number of atoms for each element law;
   3. the electrolysis law;
   4. solutions laws;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. 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 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
   
   
2. Intensitatea curentului:
   1. depinde de suprafata probei;
   2. trebuie sa fie ajustata cand se incepe experimentul;
   3. afecteaza numai cantitatea de nichel depus;
   4. afecteaza numai calitatea depunerii nichelului;
   5. se calculeaza dupa efectuarea experimentului;
   
   
3. Este de asteptat ca masa de nichel depus sa fie:
   1. mult mai mica decāt cea teoretica calculata;
   2. proportionala cu timpul de nichelare;
   3. mult mai mare decāt cea teoretica calculata;
   4. proportionala cu intensitatea curentului utilizat;
   5. invers proportional cu timpul de nichelare;
   
   
4. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este īmbunatatita prin adaosuri de saruri;
   2. depinde de intensitatea curentului utilizat;
   3. este relativ mare;
   4. este relativ mica;
   5. este redusa prin adaosuri de saruri;
   
   
5. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea gazelor perfecte;
   2. conservarea numarului de atomi pentru fiecare element;
   3. legea electrolizei;
   4. legea solutilor;
   5. legea actiunii maselor;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. Theoretical mass of nickel deposited is calculated using:
   1. the conservation of the energy law;
   2. the electrolysis law;
   3. perfect gas law;
   4. the conservation of the number of atoms for each element law;
   
   
2. Electrical conductivity of nickel salts solutions:
   1. depends on the intensity of the current used;
   2. is relatively small;
   3. is relatively high;
   4. is improved by salts additions;
   
   
3. It is expected to have a mass of nickel deposited:
   1. proportional with the surface of the sample;
   2. proportional with the nickel plating time;
   3. proportional with the intensity of the current used;
   4. inversely proportional with the intensity of the current used;
   
   
4. 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 anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   4. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   
   
5. The intensity of the current:
   1. does not affect the quality nor the quantity of the nickel deposition;
   2. is to be calculated after conducting the experiment;
   3. it depends on the surface of the sample;
   4. affect only the quantity of the nickel deposition;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea conservarii energiei;
   2. legea electrolizei;
   3. legea gazelor perfecte;
   4. conservarea numarului de atomi pentru fiecare element;
   
   
2. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. depinde de intensitatea curentului utilizat;
   2. este relativ mica;
   3. este relativ mare;
   4. este īmbunatatita prin adaosuri de saruri;
   
   
3. Este de asteptat ca masa de nichel depus sa fie:
   1. proportionala cu suprafata probei;
   2. proportionala cu timpul de nichelare;
   3. proportionala cu intensitatea curentului utilizat;
   4. invers proportionala cu intensitatea curentului utilizat;
   
   
4. 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 anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   4. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   
   
5. Intensitatea curentului:
   1. nu afecteaza calitatea nici cantitatea nichelului depus;
   2. se calculeaza dupa efectuarea experimentului;
   3. depinde de suprafata probei;
   4. afecteaza numai cantitatea de nichel depus;
   5. trebuie sa fie ajustata cand se incepe experimentul;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. Electrical conductivity of nickel salts solutions:
   1. is reduced by salts additions;
   2. depends on the intensity of the current used;
   3. is relatively small;
   4. is relatively high;
   
   
2. It is expected to have a mass of nickel deposited:
   1. proportional with the nickel plating time;
   2. much higher than the calculated theoretical one;
   3. lower than the calculated theoretical one;
   4. higher than the calculated theoretical one;
   
   
3. Theoretical mass of nickel deposited is calculated using:
   1. the conservation of the energy law;
   2. solutions laws;
   3. the conservation of the number of atoms for each element law;
   4. the electrolysis law;
   
   
4. The intensity of the current:
   1. it depends on the surface of the sample;
   2. should be adjusted by the technicians, we have nothing to do there;
   3. is to be calculated after conducting the experiment;
   4. does not affect the quality nor the quantity of the nickel deposition;
   
   
5. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   2. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   3. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   4. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the anode: O^2- - 2e^- -> O₂⁰
   
   

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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