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

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. latimea tubului si nu lungimea tubului;
   3. concentratiile solutiilor utilizate;
   4. propagarea speciilor ca ionii si nu ca si molecule neutre;
   
   
2. Cronometrul este utilizat īn experimentul pentru:
   1. masurarea timpului de difuzie;
   2. sincronizarea timpilor de difuzie;
   3. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   4. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   5. sa ne tina ocupati;
   
   
3. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate au aceeasi energie;
   2. toate se deplaseaza īn aceeasi directie;
   3. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   4. toate se īndreapta īntr-o directie arbitrara;
   5. toate au aceeasi viteza;
   
   
4. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H₂O \=\ H⁺ + HO^-
   2. H⁺ + HO^- \=\ H₂O
   3. NH₃ + HCl \=\ NH₄Cl
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
5. 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 viteze īn toate starile gazoasa, lichida si solida;
   3. moleculele au energie īn toate starile gazoasa, lichida si solida;
   4. energia cinetica a unei molecule este afectata de numai temperatura;
   
   

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

1. At the ends of the tube following equilibrium reactions occurs:
   1. H⁺ + HO^- \=\ H₂O
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. NH₃ + HCl \=\ NH₄Cl
   
   
2. We may say the followings:
   1. diffusion process appears only in gaseous state;
   2. the kinetic energy of a molecule is affected by temperature only;
   3. diffusion process appears only in gaseous and liquid states;
   4. the molecules have energy in all gaseous, liquid and solid states;
   
   
3. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory and our breathing;
   2. our experiment designed to trap the product of the reaction;
   3. formation of ammonium chloride;
   4. presence of the chlorine;
   
   
4. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all are moving in the same direction;
   2. all have same energy;
   3. are considered to be at the same temperature, but may have different energies;
   4. are considered to be at the same temperature, but may have different speeds;
   
   
5. The chronometer is used in the experiment for:
   1. indication of the moment when we should pay attention to the experiment;
   2. synchronization of the diffusion times;
   3. measuring of the diffusion time;
   4. extracting the information necessary to calculate the speeds ratio;
   
   

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

1. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H⁺ + HO^- \=\ H₂O
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. NH₃ + HCl \=\ NH₄Cl
   
   
2. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. proces de difuzie apare numai īn stare gazoasa;
   2. energia cinetica a unei molecule este afectata de numai temperatura;
   3. proces de difuzie apare numai īn stare gazoasa si lichida;
   4. moleculele au energie īn toate starile gazoasa, lichida si solida;
   
   
3. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   2. experimentului nostru proiectat pentru a captura produsul de reactie;
   3. formarea clorurii de amoniu;
   4. prezentei clorului;
   
   
4. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate se deplaseaza īn aceeasi directie;
   2. toate au aceeasi energie;
   3. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   5. toate se īndreapta īntr-o directie arbitrara;
   
   
5. Cronometrul este utilizat īn experimentul pentru:
   1. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   2. sincronizarea timpilor de difuzie;
   3. masurarea timpului de difuzie;
   4. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   
   

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

1. We may say the followings:
   1. diffusion process appears only in gaseous state;
   2. the kinetic energy of a molecule is affected by temperature only;
   3. the molecules have speeds in all gaseous, liquid and solid states;
   4. the kinetic energy of a molecule is affected by temperature and pressure;
   
   
2. The chronometer is used in the experiment for:
   1. synchronization of the diffusion times;
   2. extracting the information necessary to calculate the speeds ratio;
   3. indication of the moment when we should pay attention to the experiment;
   4. to keep us busy;
   
   
3. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + HCl \=\ NH₄Cl
   2. H₂O \=\ H⁺ + HO^-
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   
   
4. The fog observed during the experiment is due to:
   1. presence of the ammonia;
   2. our experiment designed to trap the product of the reaction;
   3. unproper illumination in the laboratory or our breathing;
   4. formation of ammonium chloride;
   
   
5. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. are considered to be at the same temperature, but may have different speeds;
   2. all have same energy;
   3. all have same speed;
   4. all are moving in an arbitrary direction;
   
   

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

1. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. proces de difuzie apare numai īn stare gazoasa;
   2. energia cinetica a unei molecule este afectata de numai temperatura;
   3. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   4. energia cinetica a unei molecule este afectata de temperatura si presiune;
   
   
2. Cronometrul este utilizat īn experimentul pentru:
   1. sincronizarea timpilor de difuzie;
   2. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   3. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   4. sa ne tina ocupati;
   
   
3. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₃ + HCl \=\ NH₄Cl
   2. H₂O \=\ H⁺ + HO^-
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   
   
4. Ceata observata īn timpul experimentului se datoreaza:
   1. prezentei amoniacului;
   2. experimentului nostru proiectat pentru a captura produsul de reactie;
   3. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   4. formarea clorurii de amoniu;
   5. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   
   
5. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   2. toate au aceeasi energie;
   3. toate au aceeasi viteza;
   4. toate se īndreapta īntr-o directie arbitrara;
   
   

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

1. The chronometer is used in the experiment for:
   1. measuring of the diffusion time;
   2. synchronization of the diffusion times;
   3. to keep us busy;
   4. extracting the information necessary to calculate the speeds ratio;
   
   
2. The fog observed during the experiment is due to:
   1. presence of the ammonia;
   2. unproper illumination in the laboratory or our breathing;
   3. unproper illumination in the laboratory and our breathing;
   4. presence of the chlorine;
   
   
3. 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 concentrations of the solutions used;
   3. the propagation of the species as ions and not as neutral molecules;
   4. the length of the tube and the width of the tube;
   
   
4. At the ends of the tube following equilibrium reactions occurs:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. H⁺ + HO^- \=\ H₂O
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. H₂O \=\ H⁺ + HO^-
   
   
5. The position of the ring in the experiment is dependent on:
   1. the length of the tube and the width of the tube;
   2. the real speeds and not the virtual speeds of each involved species;
   3. the average energy or average speed of each involved species;
   4. the propagation of the species as neutral molecules and not as ions;
   
   

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

1. Cronometrul este utilizat īn experimentul pentru:
   1. masurarea timpului de difuzie;
   2. sincronizarea timpilor de difuzie;
   3. sa ne tina ocupati;
   4. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   5. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   
   
2. Ceata observata īn timpul experimentului se datoreaza:
   1. prezentei amoniacului;
   2. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   3. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   4. prezentei clorului;
   5. experimentului nostru proiectat pentru a captura produsul de reactie;
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. energia medie sau viteza medie a fiecarei specii implicate;
   2. concentratiile solutiilor utilizate;
   3. propagarea speciilor ca ionii si nu ca si molecule neutre;
   4. lungimea tubului si latimea tubului;
   
   
4. La capetele tubului urmatoarele reactii de echilibru apar:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. H⁺ + HO^- \=\ H₂O
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. H₂O \=\ H⁺ + HO^-
   
   
5. Pozitia inelului īn experimentul este dependenta de:
   1. lungimea tubului si latimea tubului;
   2. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   3. energia medie sau viteza medie a fiecarei specii implicate;
   4. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   
   

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

1. We may say the followings:
   1. the molecules have energy only in gaseous and liquid states;
   2. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   3. the kinetic energy of a molecule is affected by temperature only;
   4. the molecules have speeds only in gaseous state;
   
   
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. unproper illumination in the laboratory and our breathing;
   4. presence of the chlorine;
   
   
3. The chronometer is used in the experiment for:
   1. extracting the information necessary to calculate the diffusion coefficients;
   2. to keep us busy;
   3. measuring of the diffusion time;
   4. synchronization of the diffusion times;
   
   
4. The position of the ring in the experiment is dependent on:
   1. the speed of diffusion of each involved species;
   2. the average energy or average speed of each involved species;
   3. the mode energy or mode speed of each involved species;
   4. the real speeds and not the virtual speeds of each involved species;
   
   
5. 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 virtual speeds and not the real speeds of each involved species;
   3. the width of the tube and not of the length of the tube;
   4. the concentrations of the solutions used;
   
   

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

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

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. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   4. increasing of the temperature of a solid mass when was heated;
   
   
2. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KClO₃ -> KCl + O₂;
   2. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   3. KNO₂ + O₂ -> KNO₃;
   4. KCl + O₂ -> KClO₃;
   
   
3. 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 between an certain number of state parameters;
   3. a relation derived to approximate the relation between state parameters;
   4. a relation which takes into account certain deviations from the ideal model;
   
   
4. For gaseous state:
   1. the pressure is unchanged when a chemical reaction occurs;
   2. it exists an equation for all, p · V = n · R · T;
   3. the pressure is exactly the same as in liquid state;
   4. the pressure depends on the model which are used to approximate it;
   
   
5. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   2. oxigen were released as result of the decomposition;
   3. the ideal model of a gas approximated the best the behavior of the released gas;
   4. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   
   

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. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   4. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KClO₃ -> KCl + O₂;
   2. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   3. KNO₂ + O₂ -> KNO₃;
   4. KCl + O₂ -> KClO₃;
   5. H₂O + O₂ -> H₂O₂;
   
   
3. 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 īntre un anumit numar de parametri de stare;
   3. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   4. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   
   
4. Pentru stare gazoasa:
   1. presiunea este neschimbata cānd apare o reactie chimica;
   2. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   3. presiunea este exact la fel ca si īn stare lichida;
   4. presiunea depinde de modelul care este utilizat pentru o aproxima;
   5. presiunea se pot modifica atunci cānd apare o reactie chimica;
   
   
5. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. oxigenul au fost eliberat ca urmare a descompunerii;
   3. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   4. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   5. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   

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. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   3. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   4. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. ozone were released as result of the decomposition;
   2. the ideal model of a gas approximated the best the behavior of the released gas;
   3. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   4. air were released as result of the decomposition;
   
   
3. For gaseous state:
   1. the pressure is approximately the same as in liquid state;
   2. the pressure depends on the model which are used to approximate it;
   3. it exists an equation for all, p · V = n · R · T;
   4. the pressure is subject to change when a chemical reaction occurs;
   
   
4. A state equation for a real gas is:
   1. usable in the laboratory, but is not to be used somewhere else;
   2. a relation between an unlimited number of state parameters;
   3. a relation between an certain number of state parameters;
   4. a relation which is always true, independent of the values of the state parameters;
   
   
5. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   2. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   3. distillation of the liquid air;
   4. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   
   

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. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   3. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. ozonul au fost eliberat ca urmare a descompunerii;
   2. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   3. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. aer a fost eliberat ca urmare a descompunerii;
   5. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   
   
3. Pentru stare gazoasa:
   1. presiunea este aproximativ aceeasi ca si īn stare lichida;
   2. presiunea depinde de modelul care este utilizat pentru o aproxima;
   3. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   4. presiunea se pot modifica atunci cānd apare o reactie chimica;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   2. o relatie īntre un numar nelimitat de parametri de stare;
   3. o relatie īntre un anumit numar de parametri de stare;
   4. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   
   
5. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   2. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   3. distilarea aerului lichid;
   4. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   
   

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

1. The values taken from the experiment conducted in the laboratory indicated that:
   1. the ideal model of a gas approximated the worst the behavior of the released gas;
   2. the ideal model of a gas approximated the best the behavior of the released gas;
   3. air were released as result of the decomposition;
   4. we possess enough information to decide what gas was released from the reaction;
   
   
2. For gaseous state:
   1. the pressure is exactly the same as in liquid state;
   2. the pressure is much higher than in liquid state;
   3. we need to take supplementary precautions in the laboratory;
   4. the pressure is subject to change when a chemical reaction occurs;
   
   
3. In the laboratory were studied:
   1. increasing of the temperature of a solid mass when was heated;
   2. increasing of the pressure of a gas when was heated;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   4. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   2. opening a bubble water bottle;
   3. KNO₃ -> KNO₂ + O₂;
   4. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   
   
5. A state equation for a real gas is:
   1. a relation between an unlimited number of state parameters;
   2. a relation derived to approximate the relation between state parameters;
   3. a relation obtained after conducting of the experiment;
   4. a relation which is always true, independent of the values of the state parameters;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   2. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   3. aer a fost eliberat ca urmare a descompunerii;
   4. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
2. Pentru stare gazoasa:
   1. presiunea este exact la fel ca si īn stare lichida;
   2. presiunea este mult mai mare decāt īn stare lichida;
   3. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   4. presiunea se pot modifica atunci cānd apare o reactie chimica;
   
   
3. Īn laborator s-au studiat:
   1. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   2. cresterea presiunii unui gaz cānd s-a īncalzit;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   5. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   
   
4. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   2. deschiderea unei sticle de apa cu bule;
   3. KNO₃ -> KNO₂ + O₂;
   4. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   
   
5. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un numar nelimitat de parametri de stare;
   2. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   3. o relatie obtinut dupa efectuarea experimentului;
   4. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   5. o relatie care poate implica unele constante dependente de compozitia gazului;
   
   

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

1. For gaseous state:
   1. the pressure is approximately the same as in liquid state;
   2. the pressure is exactly the same as in liquid state;
   3. the pressure is much lower than in liquid state;
   4. the pressure is unchanged when a chemical reaction occurs;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. ozone were released as result of the decomposition;
   2. the ideal model of a gas approximated the worst the behavior of the released gas;
   3. the ideal model of a gas approximated the best the behavior of the released gas;
   4. air were released as result of the decomposition;
   
   
3. In the laboratory were studied:
   1. increasing of the temperature of a solid mass when was heated;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   3. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   4. the producing of some gas as result of a lost of the mass of a solid;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. H₂O + O₂ -> H₂O₂;
   2. KNO₃ -> KNO₂ + O₂;
   3. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   4. distillation of the liquid air;
   
   
5. A state equation for a real gas is:
   1. a relation derived to approximate the relation between state parameters;
   2. usable in the laboratory, but is not to be used somewhere else;
   3. a relation which may involve some constants dependent of gas composition;
   4. a relation between an unlimited number of state parameters;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pentru stare gazoasa:
   1. presiunea este aproximativ aceeasi ca si īn stare lichida;
   2. presiunea este exact la fel ca si īn stare lichida;
   3. presiunea este mult mai mica decāt īn stare lichida;
   4. presiunea este neschimbata cānd apare o reactie chimica;
   5. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. ozonul au fost eliberat ca urmare a descompunerii;
   2. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   3. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   4. aer a fost eliberat ca urmare a descompunerii;
   5. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   
   
3. Īn laborator s-au studiat:
   1. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   3. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   4. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   
   
4. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. H₂O + O₂ -> H₂O₂;
   2. KNO₃ -> KNO₂ + O₂;
   3. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   4. distilarea aerului lichid;
   
   
5. O ecuatie de stare pentru un gaz real este:
   1. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   2. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   3. o relatie care poate implica unele constante dependente de compozitia gazului;
   4. o relatie īntre un numar nelimitat de parametri de stare;
   5. o relatie obtinut dupa efectuarea experimentului;
   
   

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 is always true, independent of the values of the state parameters;
   3. a relation between an unlimited number of state parameters;
   4. a relation which takes into account certain deviations from the ideal model;
   
   
2. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. Ag₂O -> Ag + O₂;
   2. Ag + O₂ -> Ag₂O;
   3. H₂O + O₂ -> H₂O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
3. 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;
   
   
4. For gaseous state:
   1. the pressure depends on the model which are used to approximate it;
   2. it exists an equation for all, p · V = n · R · T;
   3. the pressure is approximately the same as in liquid state;
   4. the pressure is much higher than in liquid state;
   
   
5. 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. ozone were released as result of the decomposition;
   
   

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 este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   3. o relatie īntre un numar nelimitat de parametri de stare;
   4. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   5. o relatie īntre un anumit numar de parametri de stare;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. Ag₂O -> Ag + O₂;
   2. Ag + O₂ -> Ag₂O;
   3. H₂O + O₂ -> H₂O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   5. KClO₃ -> KCl + O₂;
   
   
3. 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;
   
   
4. Pentru stare gazoasa:
   1. presiunea depinde de modelul care este utilizat pentru o aproxima;
   2. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   3. presiunea este aproximativ aceeasi ca si īn stare lichida;
   4. presiunea este mult mai mare decāt īn stare lichida;
   
   
5. 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. ozonul au fost eliberat ca urmare a descompunerii;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. Why moisten the paper with solution of sodium nitrate?
   1. to have something to do in the laboratory;
   2. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   3. for stopping after a while the chemical reaction that takes place;
   4. to provide cations for analysis;
   
   
2. The paper requires before analysis of the sample:
   1. to be dry;
   2. to be burned;
   3. to be cut in small pieces;
   4. to be tested;
   
   
3. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
4. When the electrical circuit is closed:
   1. elements from the metals are passed into solution as cations;
   2. anions from the solution are passed into sample as metals;
   3. cations from the solution are passed into sample as metals;
   4. electric current avoids the sample and the paper;
   
   
5. This method of analysis of metals and alloys is:
   1. too ancient to be used today in the laboratory;
   2. not useful for both metals and alloys;
   3. useful for pure metals, not so useful for alloys;
   4. a nondestructive method of analysis;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru a avea ceva de a face īn laborator;
   2. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   3. pentru oprirea dupa un timp reactiei chimice care are loc;
   4. pentru furniza cationi pentru analiza;
   5. sa ne acomodam in a utiliza substante chimice;
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie uscata;
   2. sa fie arsa;
   3. sa fie taiata īn bucati mici;
   4. sa fie testata;
   5. sa i se masoare suprafata;
   
   
3. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   5. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
4. Cānd circuitul electric este īnchis:
   1. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   2. anionii din solutie sunt trecuti īn proba ca metale;
   3. cationii din solutie sunt trecuti īn proba ca metale;
   4. curent electric evita proba si hārtia;
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. prea veche pentru a fi utilizata īn prezent īn laborator;
   2. nu este utila nici pentru metale nici pentru aliaje;
   3. utila pentru metale pure, nu atāt de utila pentru aliaje;
   4. o metoda nedistructiva de analiza;
   
   

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 measure its surface;
   3. to be cut in small pieces;
   4. to be burned;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. for stopping after a while the chemical reaction that takes place;
   2. to provide cations for analysis;
   3. for the paper to work as isolator;
   4. to accomodate ourselves to use chemicals;
   
   
3. When lead is identified:
   1. precautions should be made for toxic wastes disposal;
   2. the reactions used clearly indicates its presence;
   3. dangerous substances are used;
   4. interference of other ions may affect the outcome;
   
   
4. This method of analysis of metals and alloys is:
   1. useful for pure metals, not so useful for alloys;
   2. a destructive method of analysis;
   3. a quantitative method of analysis;
   4. a nondestructive method of analysis;
   
   
5. The electric charges after passing the metals into solution may be:
   1. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   2. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   

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 i se masoare suprafata;
   3. sa fie taiata īn bucati mici;
   4. sa fie arsa;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru oprirea dupa un timp reactiei chimice care are loc;
   2. pentru furniza cationi pentru analiza;
   3. pentru ca hartia sa actioneze ca izolator;
   4. sa ne acomodam in a utiliza substante chimice;
   5. sa fie taiat cu usurinta cu foarfeca;
   
   
3. Cānd plumbul este identificat:
   1. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   2. reactiile utilizate īn mod clar ii indica prezenta;
   3. sunt utilizate substante periculoase;
   4. interferenta altor ioni poate afecta rezultatul;
   
   
4. Aceasta metoda de analiza de metale si aliaje este:
   1. utila pentru metale pure, nu atāt de utila pentru aliaje;
   2. o metoda distructiva de analiza;
   3. o metoda cantitativa de analiza;
   4. o metoda nedistructiva de analiza;
   5. prea veche pentru a fi utilizata īn prezent īn laborator;
   
   
5. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   2. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   5. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When the electrical circuit is closed:
   1. water dissociation is inhibited;
   2. electric current passes the sample and the paper;
   3. surface of the sample is fastly covered by a protecting shield of electrons;
   4. anions from the solution are passed into sample as metals;
   
   
2. When lead is identified:
   1. a violet complex appears;
   2. dangerous substances are used;
   3. interference of other ions may affect the outcome;
   4. the reactions used clearly indicates its presence;
   
   
3. The paper requires before analysis of the sample:
   1. to be weighted;
   2. to be moistened with an electrolyte;
   3. to measure its surface;
   4. to be burned;
   
   
4. When aluminum is identified:
   1. is identified as Al¹⁺ cation;
   2. using of alizarin along with ammonium hidroxide provide a more selective indication about the presence of aluminum;
   3. the presence of other ions may produce a true positive outcome;
   4. is identified as Al²⁺ cation;
   
   
5. 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. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd circuitul electric este īnchis:
   1. disocierea apei este inhibata;
   2. curent electric trece prin proba si hārtie;
   3. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   4. anionii din solutie sunt trecuti īn proba ca metale;
   5. elemente din solutie sunt trecute īn proba ca metale;
   
   
2. Cānd plumbul este identificat:
   1. apare un complex violet;
   2. sunt utilizate substante periculoase;
   3. interferenta altor ioni poate afecta rezultatul;
   4. reactiile utilizate īn mod clar ii indica prezenta;
   5. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   
   
3. Hartia necesita ca īnainte de analiza probei:
   1. sa fie cantarita;
   2. sa fie umezita cu un electrolit;
   3. sa i se masoare suprafata;
   4. sa fie arsa;
   5. sa fie acidulata;
   
   
4. Cānd aluminiu este identificat:
   1. este identificat ca cationul Al¹⁺;
   2. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un indiciu mai selectiv cu privire la prezenta aluminiului;
   3. prezenta altor ioni poate produce un rezultat adevarat pozitiv;
   4. este identificat ca cationul Al²⁺;
   
   
5. 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. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. a destructive method of analysis;
   2. useful for pure metals, not so useful for alloys;
   3. too ancient to be used today in the laboratory;
   4. useful for alloys, not so useful for metals;
   
   
2. When lead is identified:
   1. a red-brown complex appears;
   2. dangerous substances are used;
   3. interference of other ions may affect the outcome;
   4. a heat release is observed;
   
   
3. Why moisten the paper with solution of sodium nitrate?
   1. to be cut easily with scissors;
   2. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   3. for stopping after a while the chemical reaction that takes place;
   4. to provide cations for analysis;
   
   
4. The paper requires before analysis of the sample:
   1. to be dry;
   2. to be weighted;
   3. to be cut in small pieces;
   4. to be moistened with an electrolyte;
   
   
5. When aluminum is identified:
   1. using of alizarin along with ammonium hidroxide provide a red colored complex;
   2. the presence of other ions may produce a true negative outcome;
   3. using of alizarin along with ammonium hidroxide provide a more selective indication about the presence of aluminum;
   4. is identified as Al³⁺ cation;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda distructiva de analiza;
   2. utila pentru metale pure, nu atāt de utila pentru aliaje;
   3. prea veche pentru a fi utilizata īn prezent īn laborator;
   4. utila pentru aliaje, nu atāt de utila pentru metale;
   5. utila atāt pentru metale si aliaje;
   
   
2. Cānd plumbul este identificat:
   1. apare un complex rosu-brun;
   2. sunt utilizate substante periculoase;
   3. interferenta altor ioni poate afecta rezultatul;
   4. se observa o eliberare de caldura;
   5. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   
   
3. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa fie taiat cu usurinta cu foarfeca;
   2. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   3. pentru oprirea dupa un timp reactiei chimice care are loc;
   4. pentru furniza cationi pentru analiza;
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa fie uscata;
   2. sa fie cantarita;
   3. sa fie taiata īn bucati mici;
   4. sa fie umezita cu un electrolit;
   5. sa fie arsa;
   
   
5. Cānd aluminiu este identificat:
   1. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   2. prezenta altor ioni poate produce un rezultat adevarat negativ;
   3. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un indiciu mai selectiv cu privire la prezenta aluminiului;
   4. este identificat ca cationul Al³⁺;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The electric charges after passing the metals into solution may be:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   4. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   
   
2. When lead is identified:
   1. the reactions used clearly indicates its presence;
   2. a violet complex appears;
   3. a heat release is observed;
   4. a yellow complex appears;
   
   
3. The paper requires before analysis of the sample:
   1. to measure its surface;
   2. to be burned;
   3. to be tested;
   4. to be cut in small pieces;
   
   
4. Why moisten the paper with solution of sodium nitrate?
   1. to accomodate ourselves to use chemicals;
   2. to provide cations for analysis;
   3. to have something to do in the laboratory;
   4. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   
   
5. When aluminum is identified:
   1. using of ammonium hidroxide is enough in order to have a clear guess about the presence of aluminum;
   2. is identified as Al¹⁺ cation;
   3. only one identification reaction is possible;
   4. the presence of other ions may produce a true negative outcome;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   4. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   5. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
2. Cānd plumbul este identificat:
   1. reactiile utilizate īn mod clar ii indica prezenta;
   2. apare un complex violet;
   3. se observa o eliberare de caldura;
   4. apare un complex galben;
   
   
3. Hartia necesita ca īnainte de analiza probei:
   1. sa i se masoare suprafata;
   2. sa fie arsa;
   3. sa fie testata;
   4. sa fie taiata īn bucati mici;
   5. sa fie uscata;
   
   
4. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa ne acomodam in a utiliza substante chimice;
   2. pentru furniza cationi pentru analiza;
   3. pentru a avea ceva de a face īn laborator;
   4. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   5. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   
5. Cānd aluminiu este identificat:
   1. folosirea hidroxidului de amoniu este suficient pentru a avea indicii clare cu privire la prezenta aluminiului;
   2. este identificat ca cationul Al¹⁺;
   3. doar o reactie de identificare este posibila;
   4. prezenta altor ioni poate produce un rezultat adevarat negativ;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. A redox process:
   1. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. is always fast and safe;
   4. involves changing of the aggregation states of some participants to the reaction;
   
   
2. The indicator should be added:
   1. to provide a color change at equivalence point;
   2. in small quantities, to avoid the errors in observations and in calculations;
   3. only at the suggestion of the supervisor;
   4. only in special cases, when the burette is graded from its bottom to its top;
   
   
3. Titration as a laboratory operation involves:
   1. a standard or referential reactive;
   2. a pH-metter;
   3. an mixing of two ore more solutions;
   4. a volume measurement;
   
   
4. The equivalence point is:
   1. indicated when a color change is observed into the solution;
   2. the point in which a reactive is fully consumed in the reaction;
   3. the point in which a reactive should be added in the reaction flask;
   4. used to balance the equation;
   
   
5. The following chemical reactions were used in the experiments:
   1. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. H₂O + CO₂ -> H₂CO₃
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Un proces redox:
   1. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. este īntotdeauna rapid si sigur;
   4. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   
   
2. Trebuie adaugat indicatorul:
   1. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   2. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   3. numai la sugestia supraveghetorului;
   4. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   
   
3. Titrarea ca o operatiune de laborator implica:
   1. un standard sau reactiv de referinta;
   2. un pH-metru;
   3. amestecul a doua sau mai multe solutii;
   4. masurarea volumului;
   5. o biureta;
   
   
4. Punctul de echivalenta este:
   1. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   2. punctul īn care un reactiv este consumat complet īn reactie;
   3. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   4. folosit pentru a echilibra ecuatia;
   5. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   
   
5. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. H₂O + CO₂ -> H₂CO₃
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The density of the solutions depends on:
   1. pressure;
   2. provider;
   3. quantity;
   4. time elapsed since were prepared;
   
   
2. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the volume;
   2. the principle of the conservation of the energy;
   3. all glassware should be clean before and after conducting the experiment;
   4. the principle of the conservation of the number of atoms for each element;
   
   
3. Reactions between acids and bases:
   1. have as a consequence the dissolution of a salt;
   2. have as effect the change of the color of a solution;
   3. are all exothermic, being therefore dangerous outside of the laboratory;
   4. are rarely useful, and even rarely used;
   
   
4. The indicator should be added:
   1. in large quantities, according to the principle 'only size matters';
   2. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   3. to indicate our safety limits when we dealt with chemicals;
   4. to provide a color change at equivalence point;
   
   
5. In the calculations:
   1. are necessary to take some information from reagent bottles;
   2. are necessary to take the results imediatly after these are available from others;
   3. are necessary to use our phones;
   4. are necessary to draw the tables in our notebooks after completing of the experiment;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Densitatea solutiilor depinde de:
   1. presiune;
   2. furnizor;
   3. cantitate;
   4. timpul scurs de cand au fost pregatite;
   5. concentratie;
   
   
2. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii volumului;
   2. principiul conservarii energiei;
   3. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   4. principiul conservarii numarul de atomi pentru fiecare element;
   
   
3. Reactiile īntre acizi si baze:
   1. au drept consecinta dizolvarea unei sari;
   2. au ca efect schimbarea culorii unei solutii;
   3. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   4. sunt rareori utile, si chiar mai rar utilizate;
   5. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   
   
4. Trebuie adaugat indicatorul:
   1. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   2. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   3. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   4. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   
   
5. In calcule:
   1. este necesar a se lua unele informatii de pe sticlele de reactivi;
   2. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   3. este necesar sa utilizam telefoanele;
   4. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   5. este necesar sa discutam cu colegii;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Reactions between acids and bases:
   1. are all exothermic, being therefore dangerous outside of the laboratory;
   2. are always fast, taking place almost instantaneously;
   3. have as a consequence the dissolution of a salt;
   4. are rarely useful, and even rarely used;
   
   
2. The equivalence point is:
   1. the point in which a reactive is fully consumed in the reaction;
   2. something rarely encountered in chemistry;
   3. the point in which a reactive should be added in the reaction flask;
   4. indicated when a color change is observed into the solution;
   
   
3. The density of the solutions depends on:
   1. provider;
   2. quantity;
   3. temperature;
   4. time elapsed since were prepared;
   
   
4. A redox process:
   1. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. involves changing of the oxidation states of some participants to the reaction;
   4. is always fast and safe;
   
   
5. Titration as a laboratory operation involves:
   1. an mixing of two ore more solutions;
   2. a natrium hydroxide solution;
   3. a volume measurement;
   4. a pH-metter;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Reactiile īntre acizi si baze:
   1. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   2. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   3. au drept consecinta dizolvarea unei sari;
   4. sunt rareori utile, si chiar mai rar utilizate;
   5. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   
   
2. Punctul de echivalenta este:
   1. punctul īn care un reactiv este consumat complet īn reactie;
   2. ceva rar īntālnit īn chimie;
   3. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   4. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   5. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   
   
3. Densitatea solutiilor depinde de:
   1. furnizor;
   2. cantitate;
   3. temperatura;
   4. timpul scurs de cand au fost pregatite;
   
   
4. Un proces redox:
   1. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   4. este īntotdeauna rapid si sigur;
   5. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
5. Titrarea ca o operatiune de laborator implica:
   1. amestecul a doua sau mai multe solutii;
   2. o solutie de hidroxid de sodiu;
   3. masurarea volumului;
   4. un pH-metru;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Reactions between acids and bases:
   1. are rarely useful, and even rarely used;
   2. have as a consequence the dissolution of a salt;
   3. are always fast, taking place almost instantaneously;
   4. always have as a consequence the formation of a quantity of water;
   
   
2. The indicator should be added:
   1. in large quantities, according to the principle 'only size matters';
   2. only at the suggestion of the supervisor;
   3. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   4. in small quantities, to avoid the errors in observations and in calculations;
   
   
3. The equivalence point is:
   1. used to balance the equation;
   2. the point in which a reactive is fully consumed in the reaction;
   3. the point in which a reactive should be added in the reaction flask;
   4. something rarely encountered in chemistry;
   
   
4. The following chemical reactions were used in the experiments:
   1. H₂O + CO₂ -> H₂CO₃
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   
5. Titration as a laboratory operation involves:
   1. a volume measurement;
   2. a mass measurement;
   3. a burette;
   4. a standard or referential reactive;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Reactiile īntre acizi si baze:
   1. sunt rareori utile, si chiar mai rar utilizate;
   2. au drept consecinta dizolvarea unei sari;
   3. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   4. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   5. au ca efect schimbarea culorii unei solutii;
   
   
2. Trebuie adaugat indicatorul:
   1. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   2. numai la sugestia supraveghetorului;
   3. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   4. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   5. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   
   
3. Punctul de echivalenta este:
   1. folosit pentru a echilibra ecuatia;
   2. punctul īn care un reactiv este consumat complet īn reactie;
   3. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   4. ceva rar īntālnit īn chimie;
   
   
4. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂O + CO₂ -> H₂CO₃
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   
5. Titrarea ca o operatiune de laborator implica:
   1. masurarea volumului;
   2. masurarea masei;
   3. o biureta;
   4. un standard sau reactiv de referinta;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The indicator should be added:
   1. only in special cases, when the burette is graded from its bottom to its top;
   2. to indicate our safety limits when we dealt with chemicals;
   3. only at the suggestion of the supervisor;
   4. in small quantities, to avoid the errors in observations and in calculations;
   
   
2. In the calculations:
   1. are necessary to take the results imediatly after these are available from others;
   2. are necessary to draw the tables in our notebooks after completing of the experiment;
   3. are necessary to use our phones;
   4. are necessary to discuss with our colleagues;
   
   
3. 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: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. involves changing of the aggregation states of some participants to the reaction;
   
   
4. Titration as a laboratory operation involves:
   1. a volume measurement;
   2. a natrium hydroxide solution;
   3. a sulphuric acid solution;
   4. a standard or referential reactive;
   
   
5. The following chemical reactions were used in the experiments:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   4. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Trebuie adaugat indicatorul:
   1. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   2. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   3. numai la sugestia supraveghetorului;
   4. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   
   
2. In calcule:
   1. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   2. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   3. este necesar sa utilizam telefoanele;
   4. este necesar sa discutam cu colegii;
   
   
3. 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: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   
   
4. Titrarea ca o operatiune de laborator implica:
   1. masurarea volumului;
   2. o solutie de hidroxid de sodiu;
   3. o solutie de acid sulfuric;
   4. un standard sau reactiv de referinta;
   
   
5. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   4. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   5. H₂O + CO₂ -> H₂CO₃
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   
   
2. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   
   
3. We may say the followings:
   1. purification of the water may include chemical processes;
   2. when water contains dissolved minerals and gases is bad for drinking;
   3. natural water may contain organic matter and living organisms;
   4. purification of the water may include biological processes;
   
   
4. In the laboratory the water were:
   1. hardened using the resin column;
   2. acidified for drinking purposes;
   3. softened using the resin column;
   4. biologically purified using the resin column;
   
   
5. In the laboratory were analyzed:
   1. the concentration of the water;
   2. the mass of the water;
   3. the softness of the water;
   4. the hardness of the water;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CO₃^2- -> HCO₃^- + HO^-
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   5. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
3. Putem spune urmatoarele:
   1. purificarea apei poate include procese chimice;
   2. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   3. apa naturala poate contine materie organica si organisme vii;
   4. purificarea apei poate include procese biologice;
   
   
4. In laborator apa au fost:
   1. calita folosind coloana de rasina;
   2. acidulata pentru baut;
   3. dedurizata folosind coloana de rasina;
   4. purificata biologic utilizānd coloana de rasina;
   
   
5. Īn laborator au fost analizate:
   1. concentratia apei;
   2. masa apei;
   3. moliciunea apei;
   4. duritatea apei;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   3. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   
2. EDTA is used:
   1. for complexing of Na¹⁺ and K¹⁺ ions;
   2. for indication of the equilibrium point in the reaction;
   3. for safety precautions purposes;
   4. for complexing of Ca²⁺ and Mg²⁺ ions;
   
   
3. In the laboratory were analyzed:
   1. the mass of the water;
   2. the solubility of the water;
   3. the acidity of the water;
   4. the temperature of the water;
   
   
4. For a water sample following measures may be quantitatively expressed:
   1. mineral acidity;
   2. total alkalinity;
   3. permanent alkalinity;
   4. hardness;
   
   
5. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   2. HCl + CO₃^2- -> HCO₃^- + Cl^-
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. HCl + HO^- -> H₂O + Cl^-
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   3. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   
2. EDTA este utilizat:
   1. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   2. pentru indicarea punctului de echilibru īn reactie;
   3. ca masura de siguranta;
   4. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   
   
3. Īn laborator au fost analizate:
   1. masa apei;
   2. solubilitatea apei;
   3. aciditatea apei;
   4. temperatura apei;
   5. moliciunea apei;
   
   
4. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate minerala;
   2. alcalinitate totala;
   3. alcalinitate permanenta;
   4. duritate;
   5. culoare;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   2. HCl + CO₃^2- -> HCO₃^- + Cl^-
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. HCl + HO^- -> H₂O+Cl^-
   5. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. EDTA is used:
   1. for complexing of Na¹⁺ and K¹⁺ ions;
   2. for indication of the equilibrium point in the reaction;
   3. for recharging of the resin for water softening;
   4. as reagent for determining the hardness of the water;
   
   
2. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   3. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   4. NaOH + NO₃^- -> NaNO₃ + HO^-
   
   
3. In the laboratory the water were:
   1. biologically purified using the resin column;
   2. hardened using the resin column;
   3. alkalinized for drinking purposes;
   4. complexed by using EDTA titrimetric method;
   
   
4. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   
5. 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 + PO₄^3- -> HPO₄^2- + Cl^-
   4. HCl + HO^- -> H₂O + Cl^-
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. EDTA este utilizat:
   1. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   2. pentru indicarea punctului de echilibru īn reactie;
   3. pentru reīncarcarea rasinii la dedurizarea apei;
   4. ca reactiv pentru determinarea duritatii apei;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   3. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   4. NaOH + NO₃^- -> NaNO₃ + HO^-
   5. NaOH + Cl⁺ -> NaCl + HO⁺
   
   
3. In laborator apa au fost:
   1. purificata biologic utilizānd coloana de rasina;
   2. calita folosind coloana de rasina;
   3. alcalinizeaza pentru baut;
   4. complexata prin metoda titrimetrica EDTA;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   
5. 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 + PO₄^3- -> HPO₄^2- + Cl^-
   4. HCl + HO^- -> H₂O+Cl^-
   
   

FINAL TEST AT LABORATORY
Water analysis

1. EDTA is used:
   1. for safety precautions purposes;
   2. for recharging of the resin for water softening;
   3. for complexing of Ca²⁺ and Mg²⁺ ions;
   4. for complexing of Na¹⁺ and K¹⁺ ions;
   
   
2. We may say the followings:
   1. when water contains dissolved minerals and gases is bad for drinking;
   2. purification of the water may include biological processes;
   3. purification of the water may include physical processes;
   4. purification of the water may include chemical processes;
   
   
3. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Cl^- -> NaCl + HO^-
   2. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   3. NaOH + NO₃^- -> NaNO₃ + HO^-
   4. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   
   
4. In the laboratory the water were:
   1. biologically purified using the resin column;
   2. alkalinized for drinking purposes;
   3. hardened using the resin column;
   4. softened using the resin column;
   
   
5. In the laboratory were analyzed:
   1. the softness of the water;
   2. the boiling point of the water;
   3. the mass of the water;
   4. the hardness of the water;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. EDTA este utilizat:
   1. ca masura de siguranta;
   2. pentru reīncarcarea rasinii la dedurizarea apei;
   3. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   4. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   5. pentru indicarea punctului de echilibru īn reactie;
   
   
2. Putem spune urmatoarele:
   1. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   2. purificarea apei poate include procese biologice;
   3. purificarea apei poate include procedee fizice;
   4. purificarea apei poate include procese chimice;
   5. apa naturala poate contine materie organica si organisme vii;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + Cl^- -> NaCl + HO^-
   2. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   3. NaOH + NO₃^- -> NaNO₃ + HO^-
   4. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   5. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   
   
4. In laborator apa au fost:
   1. purificata biologic utilizānd coloana de rasina;
   2. alcalinizeaza pentru baut;
   3. calita folosind coloana de rasina;
   4. dedurizata folosind coloana de rasina;
   5. acidulata pentru baut;
   
   
5. Īn laborator au fost analizate:
   1. moliciunea apei;
   2. punctul de fierbere al apei;
   3. masa apei;
   4. duritatea apei;
   5. solubilitatea apei;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. In the laboratory were analyzed:
   1. the softness of the water;
   2. the concentration of the water;
   3. the color of the water;
   4. the boiling point of the water;
   
   
2. In the laboratory the water were:
   1. hardened using the resin column;
   2. biologically purified using the resin column;
   3. alkalinized for drinking purposes;
   4. complexed by using EDTA titrimetric method;
   
   
3. We may say the followings:
   1. purification of the water may include physical processes;
   2. purification of the water may include chemical processes;
   3. purification of the water may include labeling processes;
   4. when water contains dissolved minerals and gases is bad for drinking;
   
   
4. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
5. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   2. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   3. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   4. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Īn laborator au fost analizate:
   1. moliciunea apei;
   2. concentratia apei;
   3. culoarea apei;
   4. punctul de fierbere al apei;
   5. temperatura apei;
   
   
2. In laborator apa au fost:
   1. calita folosind coloana de rasina;
   2. purificata biologic utilizānd coloana de rasina;
   3. alcalinizeaza pentru baut;
   4. complexata prin metoda titrimetrica EDTA;
   5. acidulata pentru baut;
   
   
3. Putem spune urmatoarele:
   1. purificarea apei poate include procedee fizice;
   2. purificarea apei poate include procese chimice;
   3. purificarea apei poate include procesele de etichetare;
   4. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   2. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   3. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   4. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   

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

1. Corrosion of metals:
   1. is a beneficial process that shows the stability of metals;
   2. is helping in the process of cleaning the metals surfaces;
   3. is the protection in time to chemical agents;
   4. can be reduced by passivation;
   
   
2. Which of the following reactions may be called as of corrosion:
   1. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
3. In studied corrosion processes:
   1. a gas is released at both corrosion of zinc and aluminum;
   2. always the metal changes its oxidation state;
   3. a gas is released only the corrosion of aluminum;
   4. the metal it changes its oxidation state becoming an cation;
   
   
4. The zinc plate:
   1. was degreased in sulfuric acid solution;
   2. the surface is measured before and after immersing it in H₂SO₄;
   3. the volume is measured before and after immersing it in H₂SO₄;
   4. was involved in the volumetric method of corrosion analysis
   
   
5. The aluminum plate:
   1. the mass is measured before and after immersing it in NaOH;
   2. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   3. the surface is measured before and after immersing it in NaOH;
   4. was involved in the gravimetric method of corrosion analysis
   
   

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

1. Coroziunea metalelor:
   1. este un proces benefic care arata stabilitatea metalelor;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. este protectia de durata impotriva agentilor chimici;
   4. poate fi redusa prin pasivare;
   
   
2. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
3. Īn procesele de coroziune studiate:
   1. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   2. īntotdeauna metalul isi schimba starea de oxidare;
   3. un gaz este eliberat numai la corodarea aluminiului;
   4. metalul isi schimba starea de oxidare pentru a deveni un cation;
   
   
4. Pentru placa de zinc:
   1. a fost degresata īn solutie de acid sulfuric;
   2. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   3. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   
5. Pentru placa de aluminiu:
   1. masa este masurata īnainte si dupa imersia īn NaOH;
   2. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   3. suprafata se masoara īnainte si dupa imersia īn NaOH;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   5. a fost corodata īn solutie de hidroxid de sodiu;
   
   

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

1. The aluminum plate:
   1. the volume 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 surface 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. can be reduced by passivation;
   2. takes place merely from exposure to moisture in air;
   3. may provide useful raw materials for analysis;
   4. is a beneficial process that shows the stability of metals;
   
   
3. In studied corrosion processes:
   1. a gas is released only the corrosion of zinc;
   2. the metal it changes its oxidation state becoming an anion;
   3. always the metal changes its oxidation state;
   4. a gas is released at both corrosion of zinc and aluminum;
   
   
4. The zinc plate:
   1. the surface is measured before and after immersing it in H₂SO₄;
   2. was involved in the volumetric method of corrosion analysis
   3. was corroded in sulfuric solution;
   4. the volume is measured before and after immersing it in H₂SO₄;
   
   
5. Which of the following reactions may be called as of corrosion:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. ZnO + CO -> Zn + CO₂
   
   

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

1. Pentru placa de aluminiu:
   1. volumul 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. suprafata se masoara īnainte si dupa imersia īn NaOH;
   4. masa este masurata īnainte si dupa imersia īn NaOH;
   
   
2. Coroziunea metalelor:
   1. poate fi redusa prin pasivare;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. poate furniza materii prime utile pentru analiza;
   4. este un proces benefic care arata stabilitatea metalelor;
   
   
3. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea zincului;
   2. metalul isi schimba starea de oxidare pentru a deveni un anion;
   3. īntotdeauna metalul isi schimba starea de oxidare;
   4. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   5. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   
   
4. Pentru placa de zinc:
   1. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   2. a fost implicata īn metoda volumetrica de analiza a coroziunii
   3. a fost corodata īn solutie sulfuric;
   4. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   
   
5. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. ZnO + CO -> Zn + CO₂
   5. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   

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

1. The zinc plate:
   1. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   2. the mass is measured before and after immersing it in H₂SO₄;
   3. the surface is measured before and after immersing it in H₂SO₄;
   4. the volume is measured before and after immersing it in H₂SO₄;
   
   
2. Corrosion of metals:
   1. may provide useful raw materials for analysis;
   2. is the protection in time to chemical agents;
   3. is the destruction of metals under the action of external factors;
   4. takes place merely from exposure to moisture in air;
   
   
3. In studied corrosion processes:
   1. a gas is released only the corrosion of aluminum;
   2. a gas is released at both corrosion of zinc and aluminum;
   3. always the metal changes its oxidation state;
   4. when a gas is released its volume depends on the amount of metal corroded;
   
   
4. The aluminum plate:
   1. was degreased in sodium hydroxide solution;
   2. the mass is measured before and after immersing it in NaOH;
   3. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. was involved in the gravimetric method of corrosion analysis
   
   
5. Which of the following reactions may be called as of corrosion:
   1. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. ZnO + CO -> Zn + CO₂
   
   

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

1. Pentru placa de zinc:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   3. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   4. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   5. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   
   
2. Coroziunea metalelor:
   1. poate furniza materii prime utile pentru analiza;
   2. este protectia de durata impotriva agentilor chimici;
   3. este distrugerea metalelor sub actiunea factorilor externi;
   4. are loc pur si simplu prin expunerea la umiditate īn aer;
   5. este un proces benefic care arata stabilitatea metalelor;
   
   
3. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea aluminiului;
   2. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   3. īntotdeauna metalul isi schimba starea de oxidare;
   4. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   
   
4. Pentru placa de aluminiu:
   1. a fost degresata īn solutie de hidroxid de sodiu;
   2. masa este masurata īnainte si dupa imersia īn NaOH;
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   
   
5. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. ZnO + CO -> Zn + CO₂
   
   

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

1. The zinc plate:
   1. the volume is measured before and after immersing it in H₂SO₄;
   2. was corroded in sulfuric solution;
   3. the surface is measured before and after immersing it in H₂SO₄;
   4. was involved in the volumetric method of corrosion analysis
   
   
2. In studied corrosion processes:
   1. when a gas is released its volume depends on the amount of metal corroded;
   2. the metal it changes its oxidation state becoming an cation;
   3. a gas is released at both corrosion of zinc and aluminum;
   4. the metal it changes its oxidation state becoming an anion;
   
   
3. The aluminum plate:
   1. was involved in the volumetric method of corrosion analysis
   2. was involved in the gravimetric 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 surface is measured before and after immersing it in NaOH;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. ZnO + CO -> Zn + CO₂
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
5. Corrosion of metals:
   1. is helping in the process of cleaning the metals surfaces;
   2. may provide useful raw materials for analysis;
   3. is a beneficial process that shows the stability of metals;
   4. can be reduced by electroplating;
   
   

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

1. Pentru placa de zinc:
   1. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   2. a fost corodata īn solutie sulfuric;
   3. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   5. a fost degresata īn solutie de acid sulfuric;
   
   
2. Īn procesele de coroziune studiate:
   1. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   2. metalul isi schimba starea de oxidare pentru a deveni un cation;
   3. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   4. metalul isi schimba starea de oxidare pentru a deveni un anion;
   
   
3. Pentru placa de aluminiu:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. suprafata se masoara īnainte si dupa imersia īn NaOH;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. ZnO + CO -> Zn + CO₂
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   5. H⁺ + Zn -> H₂ + Zn²⁺
   
   
5. Coroziunea metalelor:
   1. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   2. poate furniza materii prime utile pentru analiza;
   3. este un proces benefic care arata stabilitatea metalelor;
   4. poate fi redusa prin galvanizare;
   
   

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

1. The zinc plate:
   1. was involved in the volumetric method of corrosion analysis
   2. was degreased in sulfuric acid solution;
   3. the surface is measured before and after immersing it in H₂SO₄;
   4. the mass is measured before and after immersing it in H₂SO₄;
   
   
2. Which of the following reactions may be called as of corrosion:
   1. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   2. ZnO + CO -> Zn + CO₂
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. H⁺ + Zn -> H₂ + Zn²⁺
   
   
3. The aluminum plate:
   1. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   2. the mass is measured before and after immersing it in NaOH;
   3. was degreased in sodium hydroxide solution;
   4. was involved in the gravimetric method of corrosion analysis
   
   
4. Corrosion of metals:
   1. is helping in the process of cleaning the metals surfaces;
   2. is the protection in time to chemical agents;
   3. takes place merely from exposure to moisture in air;
   4. can be reduced by passivation;
   
   
5. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. always the metal changes its oxidation state;
   3. the metal it changes its oxidation state becoming an anion;
   4. a gas is released at both corrosion of zinc and aluminum;
   
   

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

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

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 anode: O^2- - 2e^- -> O₂⁰
   2. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   3. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   4. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   
   
2. The intensity of the current:
   1. should be adjusted by the technicians, we have nothing to do there;
   2. is to be calculated after conducting the experiment;
   3. affect only the quantity of the nickel deposition;
   4. does not affect the quality nor the quantity of the nickel deposition;
   
   
3. Theoretical mass of nickel deposited is calculated using:
   1. perfect gas law;
   2. law of mass action;
   3. the conservation of the number of atoms for each element law;
   4. solutions laws;
   
   
4. 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. depends on the potential of the source used;
   
   
5. 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. proportional with the nickel plating time;
   4. lower than the calculated theoretical one;
   
   

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 anod: O^2- - 2e^- -> O₂⁰
   2. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   3. la anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   4. la anod (+), īn legatura cu piesa de nichel, Ni²⁺ + 2e^- -> Ni⁰
   
   
2. Intensitatea curentului:
   1. ar trebui sa fie ajustata de catre tehnicieni, nu avem nimic de a face acolo;
   2. se calculeaza dupa efectuarea experimentului;
   3. afecteaza numai cantitatea de nichel depus;
   4. nu afecteaza calitatea nici cantitatea nichelului depus;
   5. afecteaza numai calitatea depunerii nichelului;
   
   
3. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea gazelor perfecte;
   2. legea actiunii maselor;
   3. conservarea numarului de atomi pentru fiecare element;
   4. legea solutilor;
   
   
4. 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. depinde de potentialul sursei utilizate;
   5. este relativ mare;
   
   
5. 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. proportionala cu timpul de nichelare;
   4. mai mica decāt cea teoretica calculata;
   5. proportionala cu suprafata probei;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. The intensity of the current:
   1. should be adjusted by the technicians, we have nothing to do there;
   2. is to be calculated after conducting the experiment;
   3. affect only the quantity of the nickel deposition;
   4. is to be adjusted when the experiment starts;
   
   
2. Theoretical mass of nickel deposited is calculated using:
   1. the conservation of the energy law;
   2. perfect gas law;
   3. the conservation of the number of atoms for each element law;
   4. law of mass action;
   
   
3. 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 anode: O^2- - 2e^- -> O₂⁰
   2. at cathode (-), connected with metallic 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 cathode: O^2- - 2e^- -> O₂⁰
   
   
4. Electrical conductivity of nickel salts solutions:
   1. depends on the intensity of the current used;
   2. depends on the potential of the source used;
   3. is relatively high;
   4. is relatively small;
   
   
5. It is expected to have a mass of nickel deposited:
   1. proportional with the surface of the sample;
   2. inversely proportional with the nickel plating time;
   3. much lower than the calculated theoretical one;
   4. proportional with the intensity of the current used;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Intensitatea curentului:
   1. afecteaza numai cantitatea de nichel depus;
   2. depinde de suprafata probei;
   3. trebuie sa fie ajustata cand se incepe experimentul;
   4. nu afecteaza calitatea nici cantitatea nichelului depus;
   
   
2. Este de asteptat ca masa de nichel depus sa fie:
   1. proportionala cu intensitatea curentului utilizat;
   2. invers proportionala cu intensitatea curentului utilizat;
   3. proportionala cu timpul de nichelare;
   4. mult mai mica decāt cea teoretica calculata;
   
   
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 catod: O^2- - 2e^- -> O₂⁰
   3. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   4. la catod (-), īn contact cu piesa metalica, Ni²⁺ + 2e^- -> Ni⁰
   
   
4. 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;
   
   
5. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este īmbunatatita prin adaosuri de saruri;
   2. este relativ mare;
   3. depinde de intensitatea curentului utilizat;
   4. este redusa prin adaosuri de saruri;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   2. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   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. 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 reduced by salts additions;
   
   
3. It is expected to have a mass of nickel deposited:
   1. proportional with the intensity of the current used;
   2. inversely proportional with the intensity of the current used;
   3. much higher than the calculated theoretical one;
   4. higher than the calculated theoretical one;
   
   
4. Theoretical mass of nickel deposited is calculated using:
   1. solutions laws;
   2. the electrolysis law;
   3. perfect gas law;
   4. the conservation of the number of atoms for each element law;
   
   
5. The intensity of the current:
   1. it depends on the surface of the sample;
   2. is to be adjusted when the experiment starts;
   3. is to be calculated before to start the experiment;
   4. affect only the quality 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 legatura cu piesa de nichel, Ni²⁺ + 2e^- -> Ni⁰
   2. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   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
   5. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   
   
2. 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 redusa prin adaosuri de saruri;
   5. este relativ mica;
   
   
3. Este de asteptat ca masa de nichel depus sa fie:
   1. proportionala cu intensitatea curentului utilizat;
   2. invers proportionala cu intensitatea curentului utilizat;
   3. mult mai mare decāt cea teoretica calculata;
   4. mai mare decāt cea teoretica calculata;
   5. invers proportionala cu suprafata probei;
   
   
4. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea solutilor;
   2. legea electrolizei;
   3. legea gazelor perfecte;
   4. conservarea numarului de atomi pentru fiecare element;
   
   
5. Intensitatea curentului:
   1. depinde de suprafata probei;
   2. trebuie sa fie ajustata cand se incepe experimentul;
   3. trebuie sa fie calculata īnainte de a īncepe experimentul;
   4. afecteaza numai calitatea depunerii nichelului;
   5. ar trebui sa fie ajustata de catre tehnicieni, nu avem nimic de a face acolo;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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