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

1. The position of the ring in the experiment is dependent on:
   1. the average energy or average speed of each involved species;
   2. the propagation of the species as ions and not as neutral molecules;
   3. the mode energy or mode speed of each involved species;
   4. the speed of diffusion of each involved species;
   
   
2. The chronometer is used in the experiment for:
   1. to keep us busy;
   2. extracting the information necessary to calculate the speeds ratio;
   3. measuring of the diffusion time;
   4. synchronization of the diffusion times;
   
   
3. At the ends of the tube following equilibrium reactions occurs:
   1. H₂O \=\ H⁺ + HO^-
   2. H⁺ + HO^- \=\ H₂O
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
4. The fog observed during the experiment is due to:
   1. our experiment designed to trap the product of the reaction;
   2. presence of the ammonia;
   3. formation of ammonium chloride;
   4. presence of the chlorine;
   
   
5. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all have same speed;
   2. all are moving in the same direction;
   3. all are moving in an arbitrary direction;
   4. are considered to be at the same temperature, but may have different speeds;
   
   

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

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

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. to keep us busy;
   3. synchronization of the diffusion times;
   4. extracting the information necessary to calculate the diffusion coefficients;
   
   
2. The time to the formation of the ring in the experiment is dependent on:
   1. the virtual speeds and not the real speeds of each involved species;
   2. the concentrations of the solutions used;
   3. the width of the tube and not of the length of the tube;
   4. the propagation of the species as neutral molecules and not as ions;
   
   
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. unproper illumination in the laboratory or our breathing;
   4. formation of ammonium chloride;
   
   
4. We may say the followings:
   1. the kinetic energy of a molecule is affected by temperature only;
   2. diffusion process appears only in gaseous and liquid states;
   3. diffusion process appears only in gaseous state;
   4. diffusion process appears in all gaseous, liquid and solid states;
   
   
5. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all have same speed;
   2. all are moving in the same direction;
   3. all have same energy;
   4. all are moving in an arbitrary direction;
   
   

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

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

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 virtual speeds and not the real speeds of each involved species;
   2. the mode energy or mode speed of each involved species;
   3. the length of the tube and the width of the tube;
   4. the average energy or average speed of each involved species;
   
   
2. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. are considered to be at the same temperature, but may have different energies;
   2. all have same speed;
   3. are considered to be at the same temperature, but may have different speeds;
   4. all are moving in an arbitrary direction;
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the propagation of the species as neutral molecules and not as ions;
   2. the propagation of the species as ions and not as neutral molecules;
   3. the average energy or average speed of each involved species;
   4. the mode energy or mode speed of each involved species;
   
   
4. At the ends of the tube following equilibrium reactions occurs:
   1. H₂O \=\ H⁺ + HO^-
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. NH₄⁺ + Cl^- \=\ NH₄Cl
   4. H⁺ + HO^- \=\ H₂O
   
   
5. The fog observed during the experiment is due to:
   1. formation of ammonium chloride;
   2. unproper illumination in the laboratory and our breathing;
   3. presence of the chlorine;
   4. presence of the ammonia;
   
   

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

1. Pozitia inelului īn experimentul este dependenta de:
   1. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   2. viteza la moda sau energia la moda a fiecarei specii implicate;
   3. lungimea tubului si latimea tubului;
   4. energia medie sau viteza medie a fiecarei specii implicate;
   
   
2. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   2. toate au aceeasi viteza;
   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 energie;
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   2. propagarea speciilor ca ionii si nu ca si molecule neutre;
   3. energia medie sau viteza medie a fiecarei specii implicate;
   4. viteza la moda sau energia la moda a fiecarei specii implicate;
   
   
4. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H₂O \=\ H⁺ + HO^-
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. NH₄⁺ + Cl^- \=\ NH₄Cl
   4. H⁺ + HO^- \=\ H₂O
   5. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   
   
5. Ceata observata īn timpul experimentului se datoreaza:
   1. formarea clorurii de amoniu;
   2. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   3. prezentei clorului;
   4. prezentei amoniacului;
   5. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   
   

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

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

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

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

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

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

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

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

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. oxigen were released as result of the decomposition;
   2. the ideal model of a gas approximated the best the behavior of the released gas;
   3. the ideal model of a gas approximated the worst the behavior of the released gas;
   4. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   
   
2. In the laboratory were studied:
   1. the producing of some gas as result of a lost of the mass of a solid;
   2. the lost of the mass of a solid as result of producing of some gas;
   3. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   4. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. Ag + O₂ -> Ag₂O;
   2. distillation of the liquid air;
   3. opening a bubble water bottle;
   4. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   
   
4. For gaseous state:
   1. the pressure is approximately the same as in liquid state;
   2. the pressure is much lower than in liquid state;
   3. the pressure is unchanged when a chemical reaction occurs;
   4. we need to take supplementary precautions in the laboratory;
   
   
5. A state equation for a real gas is:
   1. a relation between an unlimited number of state parameters;
   2. a relation obtained after conducting of the experiment;
   3. usable in the laboratory, but is not to be used somewhere else;
   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. oxigenul au fost eliberat ca urmare a descompunerii;
   2. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   3. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   4. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   
   
2. Īn laborator s-au studiat:
   1. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   2. pierdut din masa de solid ca urmare a producerii unor gaze;
   3. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   4. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. Ag + O₂ -> Ag₂O;
   2. distilarea aerului lichid;
   3. deschiderea unei sticle de apa cu bule;
   4. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   5. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   
   
4. Pentru stare gazoasa:
   1. presiunea este aproximativ aceeasi ca si īn stare lichida;
   2. presiunea este mult mai mica decāt īn stare lichida;
   3. presiunea este neschimbata cānd apare o reactie chimica;
   4. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   
   
5. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un numar nelimitat de parametri de stare;
   2. o relatie obtinut dupa efectuarea experimentului;
   3. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   4. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   5. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   
   

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

1. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   2. KNO₃ -> KNO₂ + O₂;
   3. Ag₂O -> Ag + O₂;
   4. H₂O + O₂ -> H₂O₂;
   
   
2. In the laboratory were studied:
   1. increasing of the pressure of a gas when was heated;
   2. the lost of the mass of a solid as result of producing of some gas;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   4. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   
   
3. For gaseous state:
   1. it exists an equation for all, p · V = n · R · T;
   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;
   
   
4. A state equation for a real gas is:
   1. a relation derived to approximate the relation between state parameters;
   2. a relation between an certain number of state parameters;
   3. a relation obtained after conducting of the experiment;
   4. usable in the laboratory, but is not to be used somewhere else;
   
   
5. 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. we do not possess enough information to decide what gas was released from the reaction;
   4. the ideal model of a gas approximated the worst the behavior of the released gas;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   2. KNO₃ -> KNO₂ + O₂;
   3. Ag₂O -> Ag + O₂;
   4. H₂O + O₂ -> H₂O₂;
   
   
2. Īn laborator s-au studiat:
   1. cresterea presiunii unui gaz cānd s-a īncalzit;
   2. pierdut din masa de solid ca urmare a producerii unor gaze;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   
   
3. Pentru stare gazoasa:
   1. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   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;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   2. o relatie īntre un anumit numar de parametri de stare;
   3. o relatie obtinut dupa efectuarea experimentului;
   4. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   
   
5. 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. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   4. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   
   

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

1. A state equation for a real gas is:
   1. a relation which is always true, independent of the values of the state parameters;
   2. a relation which takes into account certain deviations from the ideal model;
   3. a relation which may involve some constants dependent of gas composition;
   4. a relation between an certain number of state parameters;
   
   
2. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   2. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   3. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   4. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   
   
3. For gaseous state:
   1. we need to take supplementary precautions in the laboratory;
   2. the pressure is much lower than in liquid state;
   3. the pressure is unchanged when a chemical reaction occurs;
   4. the pressure is much higher than in liquid state;
   
   
4. The values taken from the experiment conducted in the laboratory indicated that:
   1. ozone were released as result of the decomposition;
   2. air were released as result of the decomposition;
   3. oxigen were released as result of the decomposition;
   4. we possess enough information to decide what gas was released from the reaction;
   
   
5. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. Ag + O₂ -> Ag₂O;
   2. distillation of the liquid air;
   3. KClO₃ -> KCl + O₂;
   4. KNO₃ -> KNO₂ + O₂;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   2. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   3. o relatie care poate implica unele constante dependente de compozitia gazului;
   4. o relatie īntre un anumit numar de parametri de stare;
   
   
2. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   2. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   3. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   
   
3. Pentru stare gazoasa:
   1. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   2. presiunea este mult mai mica decāt īn stare lichida;
   3. presiunea este neschimbata cānd apare o reactie chimica;
   4. presiunea este mult mai mare decāt īn stare lichida;
   
   
4. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. ozonul au fost eliberat ca urmare a descompunerii;
   2. aer a fost eliberat ca urmare a descompunerii;
   3. oxigenul au fost eliberat ca urmare a descompunerii;
   4. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   5. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   
   
5. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. Ag + O₂ -> Ag₂O;
   2. distilarea aerului lichid;
   3. KClO₃ -> KCl + O₂;
   4. KNO₃ -> KNO₂ + O₂;
   
   

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

1. For gaseous state:
   1. the pressure is exactly the same as in liquid state;
   2. the pressure is unchanged when a chemical reaction occurs;
   3. the pressure is much higher than in liquid state;
   4. it exists an equation for all, p · V = n · R · T;
   
   
2. A state equation for a real gas is:
   1. a relation which may involve some constants dependent of gas composition;
   2. a relation between an certain number of state parameters;
   3. a relation which is always true, independent of the values of the state parameters;
   4. usable in the laboratory, but is not to be used somewhere else;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. H₂O + O₂ -> H₂O₂;
   2. opening a bubble water bottle;
   3. KClO₃ -> KCl + O₂;
   4. Ag₂O -> Ag + O₂;
   
   
4. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   2. ozone were released as result of the decomposition;
   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;
   
   
5. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   2. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   4. the lost of the mass of a solid as result of producing of some gas;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pentru stare gazoasa:
   1. presiunea este exact la fel ca si īn stare lichida;
   2. presiunea este neschimbata cānd apare o reactie chimica;
   3. presiunea este mult mai mare decāt īn stare lichida;
   4. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   
   
2. O ecuatie de stare pentru un gaz real este:
   1. o relatie care poate implica unele constante dependente de compozitia gazului;
   2. o relatie īntre un anumit numar de parametri de stare;
   3. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   4. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. H₂O + O₂ -> H₂O₂;
   2. deschiderea unei sticle de apa cu bule;
   3. KClO₃ -> KCl + O₂;
   4. Ag₂O -> Ag + O₂;
   5. Ag + O₂ -> Ag₂O;
   
   
4. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. ozonul au fost eliberat ca urmare a descompunerii;
   3. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   4. aer a fost eliberat ca urmare a descompunerii;
   5. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
5. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   4. pierdut din masa de solid ca urmare a producerii unor gaze;
   5. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   
   

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

1. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. distillation of the liquid air;
   2. Ag + O₂ -> Ag₂O;
   3. KNO₂ + O₂ -> KNO₃;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
2. For gaseous state:
   1. it exists an equation for all, p · V = n · R · T;
   2. the pressure is subject to change when a chemical reaction occurs;
   3. we need to take supplementary precautions in the laboratory;
   4. the pressure is much higher than in liquid state;
   
   
3. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   2. the lost of the mass of a solid as result of producing of some gas;
   3. increasing of the pressure of a gas when was heated;
   4. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   
   
4. 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. oxigen were released as result of the decomposition;
   3. ozone were released as result of the decomposition;
   4. the ideal model of a gas approximated the best the behavior of the released gas;
   
   
5. 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 certain number of state parameters;
   3. a relation between an unlimited number of state parameters;
   4. a relation which may involve some constants dependent of gas composition;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. distilarea aerului lichid;
   2. Ag + O₂ -> Ag₂O;
   3. KNO₂ + O₂ -> KNO₃;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
2. Pentru stare gazoasa:
   1. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   2. presiunea se pot modifica atunci cānd apare o reactie chimica;
   3. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   4. presiunea este mult mai mare decāt īn stare lichida;
   5. presiunea este mult mai mica decāt īn stare lichida;
   
   
3. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   2. pierdut din masa de solid ca urmare a producerii unor gaze;
   3. cresterea presiunii unui gaz cānd s-a īncalzit;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   
   
4. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   2. oxigenul au fost eliberat ca urmare a descompunerii;
   3. ozonul au fost eliberat ca urmare a descompunerii;
   4. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   5. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
5. 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 anumit numar de parametri de stare;
   3. o relatie īntre un numar nelimitat de parametri de stare;
   4. o relatie care poate implica unele constante dependente de compozitia gazului;
   5. o relatie obtinut dupa efectuarea experimentului;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The paper requires before analysis of the sample:
   1. to be tested;
   2. to be acidified;
   3. to be dry;
   4. to measure its surface;
   
   
2. When lead is identified:
   1. a heat release is observed;
   2. a yellow complex appears;
   3. interference of other ions may affect the outcome;
   4. precautions should be made for toxic wastes disposal;
   
   
3. When aluminum is identified:
   1. the presence of other ions may produce a false negative outcome;
   2. only one identification reaction is possible;
   3. is identified as Al¹⁺ cation;
   4. using of ammonium hidroxide is enough in order to have a clear guess about the presence of aluminum;
   
   
4. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
5. Why moisten the paper with solution of sodium nitrate?
   1. to provide cations for analysis;
   2. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   3. for the paper to work as isolator;
   4. to have something to do in the laboratory;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Hartia necesita ca īnainte de analiza probei:
   1. sa fie testata;
   2. sa fie acidulata;
   3. sa fie uscata;
   4. sa i se masoare suprafata;
   
   
2. Cānd plumbul este identificat:
   1. se observa o eliberare de caldura;
   2. apare un complex galben;
   3. interferenta altor ioni poate afecta rezultatul;
   4. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   5. apare un complex rosu-brun;
   
   
3. Cānd aluminiu este identificat:
   1. prezenta altor ioni poate produce un rezultat fals negativ;
   2. doar o reactie de identificare este posibila;
   3. este identificat ca cationul Al¹⁺;
   4. folosirea hidroxidului de amoniu este suficient pentru a avea indicii clare cu privire la prezenta aluminiului;
   
   
4. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   5. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   
5. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru furniza cationi pentru analiza;
   2. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   3. pentru ca hartia sa actioneze ca izolator;
   4. pentru a avea ceva de a face īn laborator;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. not useful for both metals and alloys;
   2. useful for alloys, not so useful for metals;
   3. useful for both metals and alloys;
   4. a nondestructive method of analysis;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. for the paper to work as isolator;
   2. to be cut easily with scissors;
   3. to accomodate ourselves to use chemicals;
   4. to have something to do in the laboratory;
   
   
3. The paper requires before analysis of the sample:
   1. to be burned;
   2. to be dry;
   3. to measure its surface;
   4. to be acidified;
   
   
4. When the electrical circuit is closed:
   1. electric current passes the sample and the paper;
   2. anions from the solution are passed into sample as metals;
   3. water dissociation is inhibited;
   4. elements from the solution are passed into sample as metals;
   
   
5. When lead is identified:
   1. precautions should be made for toxic wastes disposal;
   2. a yellow complex appears;
   3. the reactions used clearly indicates its presence;
   4. a red-brown complex appears;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. nu este utila nici pentru metale nici pentru aliaje;
   2. utila pentru aliaje, nu atāt de utila pentru metale;
   3. utila atāt pentru metale si aliaje;
   4. o metoda nedistructiva de analiza;
   5. o metoda distructiva de analiza;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru ca hartia sa actioneze ca izolator;
   2. sa fie taiat cu usurinta cu foarfeca;
   3. sa ne acomodam in a utiliza substante chimice;
   4. pentru a avea ceva de a face īn laborator;
   5. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   
3. Hartia necesita ca īnainte de analiza probei:
   1. sa fie arsa;
   2. sa fie uscata;
   3. sa i se masoare suprafata;
   4. sa fie acidulata;
   
   
4. Cānd circuitul electric este īnchis:
   1. curent electric trece prin proba si hārtie;
   2. anionii din solutie sunt trecuti īn proba ca metale;
   3. disocierea apei este inhibata;
   4. elemente din solutie sunt trecute īn proba ca metale;
   5. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   
   
5. Cānd plumbul este identificat:
   1. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   2. apare un complex galben;
   3. reactiile utilizate īn mod clar ii indica prezenta;
   4. apare un complex rosu-brun;
   5. se observa o eliberare de caldura;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When the electrical circuit is closed:
   1. surface of the sample is fastly covered by a protecting shield of electrons;
   2. anions from the solution are passed into sample as metals;
   3. cations from the solution are passed into sample as metals;
   4. elements from the solution are passed into sample as metals;
   
   
2. The paper requires before analysis of the sample:
   1. to measure its surface;
   2. to be dry;
   3. to be moistened with an electrolyte;
   4. to be cut in small pieces;
   
   
3. This method of analysis of metals and alloys is:
   1. useful for pure metals, not so useful for alloys;
   2. useful for both metals and alloys;
   3. a quantitative method of analysis;
   4. too ancient to be used today in the laboratory;
   
   
4. When aluminum is identified:
   1. is identified as Al¹⁺ cation;
   2. the presence of other ions may produce a false positive outcome;
   3. is identified as Al³⁺ cation;
   4. using of alizarin along with ammonium hidroxide provide a more selective indication about the presence of aluminum;
   
   
5. When lead is identified:
   1. a blue complex appears;
   2. a violet complex appears;
   3. a yellow complex appears;
   4. a red-brown complex appears;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd circuitul electric este īnchis:
   1. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   2. anionii din solutie sunt trecuti īn proba ca metale;
   3. cationii din solutie sunt trecuti īn proba ca metale;
   4. elemente din solutie sunt trecute īn proba ca metale;
   5. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa i se masoare suprafata;
   2. sa fie uscata;
   3. sa fie umezita cu un electrolit;
   4. sa fie taiata īn bucati mici;
   5. sa fie testata;
   
   
3. Aceasta metoda de analiza de metale si aliaje este:
   1. utila pentru metale pure, nu atāt de utila pentru aliaje;
   2. utila atāt pentru metale si aliaje;
   3. o metoda cantitativa de analiza;
   4. prea veche pentru a fi utilizata īn prezent īn laborator;
   
   
4. Cānd aluminiu este identificat:
   1. este identificat ca cationul Al¹⁺;
   2. prezenta altor ioni poate produce un rezultat fals pozitiv;
   3. este identificat ca cationul Al³⁺;
   4. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un indiciu mai selectiv cu privire la prezenta aluminiului;
   5. este identificat ca cationul Al²⁺;
   
   
5. Cānd plumbul este identificat:
   1. apare un complex albastru;
   2. apare un complex violet;
   3. apare un complex galben;
   4. apare un complex rosu-brun;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
2. This method of analysis of metals and alloys is:
   1. useful for both metals and alloys;
   2. too ancient to be used today in the laboratory;
   3. a gravimetric method of analysis;
   4. useful for pure metals, not so useful for alloys;
   
   
3. When aluminum is identified:
   1. the presence of other ions may produce a false negative outcome;
   2. is identified as Al¹⁺ cation;
   3. using of ammonium hidroxide is enough in order to have a clear guess about the presence of aluminum;
   4. is identified as Al³⁺ cation;
   
   
4. When the electrical circuit is closed:
   1. elements from the solution are passed into sample as metals;
   2. cations from the solution are passed into sample as metals;
   3. electric current passes the sample and the paper;
   4. electric current avoids the sample and the paper;
   
   
5. The paper requires before analysis of the sample:
   1. to be moistened with an electrolyte;
   2. to be acidified;
   3. to measure its surface;
   4. to be cut in small pieces;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   5. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   
   
2. Aceasta metoda de analiza de metale si aliaje este:
   1. utila atāt pentru metale si aliaje;
   2. prea veche pentru a fi utilizata īn prezent īn laborator;
   3. o metoda gravimetrica de analiza;
   4. utila pentru metale pure, nu atāt de utila pentru aliaje;
   5. utila pentru aliaje, nu atāt de utila pentru metale;
   
   
3. Cānd aluminiu este identificat:
   1. prezenta altor ioni poate produce un rezultat fals negativ;
   2. este identificat ca cationul Al¹⁺;
   3. folosirea hidroxidului de amoniu este suficient pentru a avea indicii clare cu privire la prezenta aluminiului;
   4. este identificat ca cationul Al³⁺;
   
   
4. Cānd circuitul electric este īnchis:
   1. elemente din solutie sunt trecute īn proba ca metale;
   2. cationii din solutie sunt trecuti īn proba ca metale;
   3. curent electric trece prin proba si hārtie;
   4. curent electric evita proba si hārtia;
   
   
5. Hartia necesita ca īnainte de analiza probei:
   1. sa fie umezita cu un electrolit;
   2. sa fie acidulata;
   3. sa i se masoare suprafata;
   4. sa fie taiata īn bucati mici;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When aluminum is identified:
   1. the presence of other ions may produce a true positive outcome;
   2. is identified as Al²⁺ cation;
   3. is identified as Al³⁺ cation;
   4. supplementary precautions should be taken, because the plates are made from aluminum too;
   
   
2. This method of analysis of metals and alloys is:
   1. a gravimetric method of analysis;
   2. too ancient to be used today in the laboratory;
   3. useful for both metals and alloys;
   4. useful for pure metals, not so useful for alloys;
   
   
3. Why moisten the paper with solution of sodium nitrate?
   1. for the paper to work as isolator;
   2. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   3. to be cut easily with scissors;
   4. to have something to do in the laboratory;
   
   
4. When lead is identified:
   1. a heat release is observed;
   2. interference of other ions may affect the outcome;
   3. a violet complex appears;
   4. a blue complex appears;
   
   
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⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd aluminiu este identificat:
   1. prezenta altor ioni poate produce un rezultat adevarat pozitiv;
   2. este identificat ca cationul Al²⁺;
   3. este identificat ca cationul Al³⁺;
   4. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   
   
2. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda gravimetrica de analiza;
   2. prea veche pentru a fi utilizata īn prezent īn laborator;
   3. utila atāt pentru metale si aliaje;
   4. utila pentru metale pure, nu atāt de utila pentru aliaje;
   5. nu este utila nici pentru metale nici pentru aliaje;
   
   
3. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru ca hartia sa actioneze ca izolator;
   2. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   3. sa fie taiat cu usurinta cu foarfeca;
   4. pentru a avea ceva de a face īn laborator;
   
   
4. Cānd plumbul este identificat:
   1. se observa o eliberare de caldura;
   2. interferenta altor ioni poate afecta rezultatul;
   3. apare un complex violet;
   4. apare un complex albastru;
   
   
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⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   5. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Reactions between acids and bases:
   1. have as a consequence the dissolution of a salt;
   2. are rarely useful, and even rarely used;
   3. are all exothermic, being therefore dangerous outside of the laboratory;
   4. always have as a consequence the formation of a quantity of water;
   
   
2. The following chemical reactions were used in the experiments:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
3. The equivalence point is:
   1. something rarely encountered in chemistry;
   2. the point in which a reactive should be added in the reaction flask;
   3. used to balance the equation;
   4. indicated when a color change is observed into the solution;
   
   
4. Titration as a laboratory operation involves:
   1. a mass measurement;
   2. a burette;
   3. a salt solution;
   4. a volume measurement;
   
   
5. When a chemical reaction is balanced, following should be considered:
   1. all glassware should be clean before, after and during the experiment;
   2. the principle of the conservation of the energy;
   3. the principle of the conservation of the number of atoms for each element;
   4. the principle of the conservation of the volume;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Reactiile īntre acizi si baze:
   1. au drept consecinta dizolvarea unei sari;
   2. sunt rareori utile, si chiar mai rar utilizate;
   3. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   4. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   
   
2. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
3. Punctul de echivalenta este:
   1. ceva rar īntālnit īn chimie;
   2. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   3. folosit pentru a echilibra ecuatia;
   4. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   5. punctul īn care un reactiv este consumat complet īn reactie;
   
   
4. Titrarea ca o operatiune de laborator implica:
   1. masurarea masei;
   2. o biureta;
   3. o solutie de sare;
   4. masurarea volumului;
   
   
5. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   2. principiul conservarii energiei;
   3. principiul conservarii numarul de atomi pentru fiecare element;
   4. principiul conservarii volumului;
   5. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The density of the solutions depends on:
   1. quantity;
   2. concentration;
   3. provider;
   4. temperature;
   
   
2. The indicator should be added:
   1. only in special cases, when the burette is graded from its bottom to its top;
   2. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   3. in small quantities, to avoid the errors in observations and in calculations;
   4. in large quantities, according to the principle 'only size matters';
   
   
3. A redox process:
   1. occurs only when we mix wrong substances in the laboratory;
   2. involves changing of the aggregation states of some participants to the reaction;
   3. involves changing of the oxidation states of some participants to the reaction;
   4. is considered to be the following one: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
4. In the calculations:
   1. are necessary to discuss with our colleagues;
   2. are necessary to take the results imediatly after these are available from others;
   3. are necessary to establish the coefficients of the chemical reaction;
   4. are necessary to take some information from reagent bottles;
   
   
5. Titration as a laboratory operation involves:
   1. a mass measurement;
   2. a pH-metter;
   3. a salt solution;
   4. a sulphuric acid solution;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Densitatea solutiilor depinde de:
   1. cantitate;
   2. concentratie;
   3. furnizor;
   4. temperatura;
   5. presiune;
   
   
2. Trebuie adaugat indicatorul:
   1. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   2. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   3. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   4. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   5. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   
   
3. Un proces redox:
   1. apare numai atunci cānd se amesteca substante gresit īn laborator;
   2. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   3. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   4. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
4. In calcule:
   1. este necesar sa discutam cu colegii;
   2. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   3. este necesara stabilirea coeficientilor reactiei chimice;
   4. este necesar a se lua unele informatii de pe sticlele de reactivi;
   5. este necesar sa utilizam telefoanele;
   
   
5. Titrarea ca o operatiune de laborator implica:
   1. masurarea masei;
   2. un pH-metru;
   3. o solutie de sare;
   4. o solutie de acid sulfuric;
   5. amestecul a doua sau mai multe solutii;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Reactions between acids and bases:
   1. are always fast, taking place almost instantaneously;
   2. have as effect the change of the color of a solution;
   3. are all exothermic, being therefore dangerous outside of the laboratory;
   4. have as a consequence the dissolution of a salt;
   
   
2. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the volume;
   2. all glassware should be clean before, after and during the experiment;
   3. the liquid in the burette should be at the same level before and after conducting the experiment;
   4. all glassware should be clean before and after conducting the experiment;
   
   
3. The density of the solutions depends on:
   1. provider;
   2. temperature;
   3. quantity;
   4. time elapsed since were prepared;
   
   
4. The following chemical reactions were used in the experiments:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
5. The equivalence point is:
   1. something rarely encountered in chemistry;
   2. the point in which a reactive should be added in the reaction flask;
   3. the point in which a reactive should be added in the burette;
   4. indicated when a color change is observed into the solution;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Reactiile īntre acizi si baze:
   1. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   2. au ca efect schimbarea culorii unei solutii;
   3. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   4. au drept consecinta dizolvarea unei sari;
   
   
2. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii volumului;
   2. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   3. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   4. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   5. principiul conservarii energiei;
   
   
3. Densitatea solutiilor depinde de:
   1. furnizor;
   2. temperatura;
   3. cantitate;
   4. timpul scurs de cand au fost pregatite;
   5. presiune;
   
   
4. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   5. H₂O + CO₂ -> H₂CO₃
   
   
5. Punctul de echivalenta este:
   1. ceva rar īntālnit īn chimie;
   2. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   3. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   4. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   5. punctul īn care un reactiv este consumat complet īn reactie;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Titration as a laboratory operation involves:
   1. a natrium hydroxide solution;
   2. a volume measurement;
   3. a mass measurement;
   4. a pH indicator that changes color depending on the pH of the solution;
   
   
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, after and during the experiment;
   4. the principle of the conservation of the number of atoms for each element;
   
   
3. The density of the solutions depends on:
   1. quantity;
   2. provider;
   3. pressure;
   4. concentration;
   
   
4. The equivalence point is:
   1. the point in which a reactive should be added in the burette;
   2. indicated when a color change is observed into the solution;
   3. the point in which a reactive is fully consumed in the reaction;
   4. something rarely encountered in chemistry;
   
   
5. Reactions between acids and bases:
   1. are rarely useful, and even rarely used;
   2. have as a consequence the dissolution of a salt;
   3. always have as a consequence the formation of a quantity of water;
   4. are always fast, taking place almost instantaneously;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Titrarea ca o operatiune de laborator implica:
   1. o solutie de hidroxid de sodiu;
   2. masurarea volumului;
   3. masurarea masei;
   4. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   
   
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, dupa, si īn timpul experimentului;
   4. principiul conservarii numarul de atomi pentru fiecare element;
   5. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   
   
3. Densitatea solutiilor depinde de:
   1. cantitate;
   2. furnizor;
   3. presiune;
   4. concentratie;
   
   
4. Punctul de echivalenta este:
   1. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   2. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   3. punctul īn care un reactiv este consumat complet īn reactie;
   4. ceva rar īntālnit īn chimie;
   5. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   
   
5. Reactiile īntre acizi si baze:
   1. sunt rareori utile, si chiar mai rar utilizate;
   2. au drept consecinta dizolvarea unei sari;
   3. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   4. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   5. au ca efect schimbarea culorii unei solutii;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Reactions between acids and bases:
   1. always have as a consequence the formation of a quantity of water;
   2. have as a consequence the dissolution of a salt;
   3. have as effect the change of the color of a solution;
   4. are rarely useful, and even rarely used;
   
   
2. The equivalence point is:
   1. something rarely encountered in chemistry;
   2. the point in which a reactive should be added in the burette;
   3. used to balance the equation;
   4. the point in which a reactive should be added in the reaction flask;
   
   
3. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the number of atoms for each element;
   2. all glassware should be clean before, after and during the experiment;
   3. all glassware should be clean before and after conducting the experiment;
   4. the principle of the conservation of the volume;
   
   
4. A redox process:
   1. involves a transfer of electrons from one atom or group of atoms to another;
   2. involves changing of the oxidation states of some participants to the reaction;
   3. occurs only when we mix wrong substances in the laboratory;
   4. is considered to be the following one: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
5. In the calculations:
   1. are necessary to establish the coefficients of the chemical reaction;
   2. are necessary to use our phones;
   3. are necessary to discuss with our colleagues;
   4. are necessary to take some information from reagent bottles;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Reactiile īntre acizi si baze:
   1. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   2. au drept consecinta dizolvarea unei sari;
   3. au ca efect schimbarea culorii unei solutii;
   4. sunt rareori utile, si chiar mai rar utilizate;
   5. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   
   
2. Punctul de echivalenta este:
   1. ceva rar īntālnit īn chimie;
   2. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   3. folosit pentru a echilibra ecuatia;
   4. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   5. punctul īn care un reactiv este consumat complet īn reactie;
   
   
3. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii numarul de atomi pentru fiecare element;
   2. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   3. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   4. principiul conservarii volumului;
   
   
4. Un proces redox:
   1. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   2. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   3. apare numai atunci cānd se amesteca substante gresit īn laborator;
   4. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
5. In calcule:
   1. este necesara stabilirea coeficientilor reactiei chimice;
   2. este necesar sa utilizam telefoanele;
   3. este necesar sa discutam cu colegii;
   4. este necesar a se lua unele informatii de pe sticlele de reactivi;
   5. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   3. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
2. We may say the followings:
   1. purification of the water may include physical processes;
   2. water is good for drinking, it is nothing to be analysed;
   3. purification of the water may include biological processes;
   4. natural water may contain organic matter and living organisms;
   
   
3. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + HO^- -> H₂O + Cl^-
   4. HCl + CO₃^2- -> HCO₃^- + Cl^-
   
   
4. In the laboratory the water were:
   1. complexed by using EDTA titrimetric method;
   2. softened using the resin column;
   3. biologically purified using the resin column;
   4. hardened using the resin column;
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. hardness;
   2. total acidity;
   3. permanent alkalinity;
   4. total alkalinity;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   3. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
2. Putem spune urmatoarele:
   1. purificarea apei poate include procedee fizice;
   2. apa este buna pentru consum, nu este nimic de a fi analizat;
   3. purificarea apei poate include procese biologice;
   4. apa naturala poate contine materie organica si organisme vii;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + HO^- -> H₂O+Cl^-
   4. HCl + CO₃^2- -> HCO₃^- + Cl^-
   
   
4. In laborator apa au fost:
   1. complexata prin metoda titrimetrica EDTA;
   2. dedurizata folosind coloana de rasina;
   3. purificata biologic utilizānd coloana de rasina;
   4. calita folosind coloana de rasina;
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. duritate;
   2. aciditate totala;
   3. alcalinitate permanenta;
   4. alcalinitate totala;
   5. aciditate minerala;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. We may say the followings:
   1. purification of the water may include chemical processes;
   2. purification of the water may include biological processes;
   3. purification of the water may include physical processes;
   4. water is pure only when is taken from a good freshwater mountain stream;
   
   
2. In the laboratory the water were:
   1. acidified for drinking purposes;
   2. alkalinized for drinking purposes;
   3. softened using the resin column;
   4. hardened using the resin column;
   
   
3. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃^2- -> HCO₃^- + Cl^-
   
   
4. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   2. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   3. NaOH + NO₃^- -> NaNO₃ + HO^-
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   
   
5. EDTA is used:
   1. for complexing of Na¹⁺ and K¹⁺ ions;
   2. as reagent for determining the hardness of the water;
   3. for indication of the equilibrium point in the reaction;
   4. for recharging of the resin for water softening;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Putem spune urmatoarele:
   1. purificarea apei poate include procese chimice;
   2. purificarea apei poate include procese biologice;
   3. purificarea apei poate include procedee fizice;
   4. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   5. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   
   
2. In laborator apa au fost:
   1. acidulata pentru baut;
   2. alcalinizeaza pentru baut;
   3. dedurizata folosind coloana de rasina;
   4. calita folosind coloana de rasina;
   5. purificata biologic utilizānd coloana de rasina;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃^2- -> HCO₃^- + Cl^-
   5. HCl + HO^- -> H₂O+Cl^-
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   2. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   3. NaOH + NO₃^- -> NaNO₃ + HO^-
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   
   
5. EDTA este utilizat:
   1. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   2. ca reactiv pentru determinarea duritatii apei;
   3. pentru indicarea punctului de echilibru īn reactie;
   4. pentru reīncarcarea rasinii la dedurizarea apei;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   
   
2. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + HCOO^- -> HCOONa + HO^-
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   4. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   
   
3. In the laboratory the water were:
   1. softened using the resin column;
   2. hardened using the resin column;
   3. complexed by using EDTA titrimetric method;
   4. biologically purified using the resin column;
   
   
4. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   
   
5. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   5. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + HCOO^- -> HCOONa + HO^-
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   4. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   
   
3. In laborator apa au fost:
   1. dedurizata folosind coloana de rasina;
   2. calita folosind coloana de rasina;
   3. complexata prin metoda titrimetrica EDTA;
   4. purificata biologic utilizānd coloana de rasina;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   5. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   
   
2. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   2. HCl + HO⁺ -> H₂O + Cl⁺
   3. HCl + HO^- -> H₂O + Cl^-
   4. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   
   
3. In the laboratory were analyzed:
   1. the color of the water;
   2. the alkalinity of the water;
   3. the temperature of the water;
   4. the hardness of the water;
   
   
4. EDTA is used:
   1. for recharging of the resin for water softening;
   2. as reagent for determining the hardness of the water;
   3. for complexing of Na¹⁺ and K¹⁺ ions;
   4. for safety precautions purposes;
   
   
5. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + HO^- -> H₂O+Cl^-
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   5. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   2. HCl + HO⁺ -> H₂O + Cl⁺
   3. HCl + HO^- -> H₂O + Cl^-
   4. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   
   
3. Īn laborator au fost analizate:
   1. culoarea apei;
   2. alcalinitatea apei;
   3. temperatura apei;
   4. duritatea apei;
   5. aciditatea apei;
   
   
4. EDTA este utilizat:
   1. pentru reīncarcarea rasinii la dedurizarea apei;
   2. ca reactiv pentru determinarea duritatii apei;
   3. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   4. ca masura de siguranta;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   5. NaOH + NO₃^- -> NaNO₃ + HO^-
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + HO^- -> H₂O + Cl^-
   
   
2. We may say the followings:
   1. purification of the water may include biological processes;
   2. purification of the water may include chemical processes;
   3. water is a good polar solvent;
   4. natural water may contain organic matter and living organisms;
   
   
3. In the laboratory were analyzed:
   1. the boiling point of the water;
   2. the acidity of the water;
   3. the alkalinity of the water;
   4. the hardness of the water;
   
   
4. 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^-
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. total acidity;
   2. mineral acidity;
   3. color;
   4. permanent alkalinity;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + HO^- -> H₂O + Cl^-
   5. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   
   
2. Putem spune urmatoarele:
   1. purificarea apei poate include procese biologice;
   2. purificarea apei poate include procese chimice;
   3. apa este un solvent polar bun;
   4. apa naturala poate contine materie organica si organisme vii;
   5. apa este buna pentru consum, nu este nimic de a fi analizat;
   
   
3. Īn laborator au fost analizate:
   1. punctul de fierbere al apei;
   2. aciditatea apei;
   3. alcalinitatea apei;
   4. duritatea apei;
   
   
4. 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 + NO₃⁺ -> NaNO₃ + HO⁺
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate totala;
   2. aciditate minerala;
   3. culoare;
   4. alcalinitate permanenta;
   5. puritate;
   
   

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

1. The aluminum plate:
   1. was degreased in sodium hydroxide solution;
   2. the volume is measured before and after immersing it in NaOH;
   3. was involved in the gravimetric method of corrosion analysis
   4. the mass is measured before and after immersing it in NaOH;
   
   
2. The zinc plate:
   1. the surface is measured before and after immersing it in H₂SO₄;
   2. the mass is measured before and after immersing it in H₂SO₄;
   3. was corroded in sulfuric solution;
   4. the volume is measured before and after immersing it in H₂SO₄;
   
   
3. Corrosion of metals:
   1. can be reduced by passivation;
   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;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Zn -> H₂ + Zn²⁺
   2. ZnO + CO -> Zn + CO₂
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. Ni(CO)₄ -> Ni + CO
   
   
5. In studied corrosion processes:
   1. a gas is released only the corrosion of aluminum;
   2. always the metal changes its oxidation state;
   3. a gas is released at both corrosion of zinc and aluminum;
   4. the metal it changes its oxidation state becoming an anion;
   
   

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

1. Pentru placa de aluminiu:
   1. a fost degresata īn solutie de hidroxid de sodiu;
   2. volumul se masoara īnainte si dupa imersia īn NaOH;
   3. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. masa este masurata īnainte si dupa imersia īn NaOH;
   
   
2. Pentru placa de zinc:
   1. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   2. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   3. a fost corodata īn solutie sulfuric;
   4. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   5. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   
   
3. Coroziunea metalelor:
   1. poate fi redusa prin pasivare;
   2. poate furniza materii prime utile pentru analiza;
   3. este un proces benefic care arata stabilitatea metalelor;
   4. poate fi redusa prin galvanizare;
   5. este distrugerea metalelor sub actiunea factorilor externi;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Zn -> H₂ + Zn²⁺
   2. ZnO + CO -> Zn + CO₂
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. Ni(CO)₄ -> Ni + CO
   
   
5. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea aluminiului;
   2. īntotdeauna metalul isi schimba starea de oxidare;
   3. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   4. metalul isi schimba starea de oxidare pentru a deveni un anion;
   5. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   
   

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

1. 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. was degreased in sodium hydroxide solution;
   3. was corroded in sodium hydroxide solution;
   4. the surface is measured before and after immersing it in NaOH;
   
   
2. Which of the following reactions may be called as of corrosion:
   1. ZnO + CO -> Zn + CO₂
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   4. Fe₂O₃ + CO -> Fe + CO₂
   
   
3. The zinc plate:
   1. was involved in the volumetric method of corrosion analysis
   2. the surface is measured before and after immersing it in H₂SO₄;
   3. was degreased in sulfuric acid solution;
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   
4. Corrosion of metals:
   1. can be reduced by passivation;
   2. takes place merely from exposure to moisture in air;
   3. is helping in the process of cleaning the metals surfaces;
   4. is the destruction of metals under the action of external factors;
   
   
5. In studied corrosion processes:
   1. always the metal changes its oxidation state;
   2. a gas is released only the corrosion of zinc;
   3. the metal it changes its oxidation state becoming an cation;
   4. when a gas is released its volume depends on the amount of metal corroded;
   
   

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

1. Pentru placa de aluminiu:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. a fost degresata īn solutie de hidroxid de sodiu;
   3. a fost corodata īn solutie de hidroxid de sodiu;
   4. suprafata se masoara īnainte si dupa imersia īn NaOH;
   
   
2. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + CO -> Zn + CO₂
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   4. Fe₂O₃ + CO -> Fe + CO₂
   5. Ni(CO)₄ -> Ni + CO
   
   
3. Pentru placa de zinc:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   3. a fost degresata īn solutie de acid sulfuric;
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   5. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   
   
4. Coroziunea metalelor:
   1. poate fi redusa prin pasivare;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   4. este distrugerea metalelor sub actiunea factorilor externi;
   
   
5. Īn procesele de coroziune studiate:
   1. īntotdeauna metalul isi schimba starea de oxidare;
   2. un gaz este eliberat numai la corodarea zincului;
   3. metalul isi schimba starea de oxidare pentru a deveni un cation;
   4. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   
   

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

1. In studied corrosion processes:
   1. a gas is released only the corrosion of aluminum;
   2. always the metal changes its oxidation state;
   3. the metal it changes its oxidation state becoming an cation;
   4. the metal it changes its oxidation state becoming an anion;
   
   
2. Corrosion of metals:
   1. is the destruction of metals under the action of external factors;
   2. may provide useful raw materials for analysis;
   3. can be reduced by electroplating;
   4. is a beneficial process that shows the stability of metals;
   
   
3. The aluminum plate:
   1. the volume is measured before and after immersing it in NaOH;
   2. was involved in the gravimetric method of corrosion analysis
   3. 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. The zinc plate:
   1. was corroded in sulfuric solution;
   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. was involved in the volumetric method of corrosion analysis
   
   
5. Which of the following reactions may be called as of corrosion:
   1. Ni(CO)₄ -> Ni + CO
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   
   

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

1. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea aluminiului;
   2. īntotdeauna metalul isi schimba starea de oxidare;
   3. metalul isi schimba starea de oxidare pentru a deveni un cation;
   4. metalul isi schimba starea de oxidare pentru a deveni un anion;
   
   
2. Coroziunea metalelor:
   1. este distrugerea metalelor sub actiunea factorilor externi;
   2. poate furniza materii prime utile pentru analiza;
   3. poate fi redusa prin galvanizare;
   4. este un proces benefic care arata stabilitatea metalelor;
   
   
3. Pentru placa de aluminiu:
   1. volumul se masoara īnainte si dupa imersia īn NaOH;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. 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;
   5. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   
4. Pentru placa de zinc:
   1. a fost corodata īn solutie sulfuric;
   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. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   
5. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Ni(CO)₄ -> Ni + CO
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   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. was corroded in sulfuric solution;
   3. the volume is measured before and after immersing it in H₂SO₄;
   4. the surface is measured before and after immersing it in H₂SO₄;
   
   
2. Corrosion of metals:
   1. may provide useful raw materials for analysis;
   2. can be reduced by electroplating;
   3. is helping in the process of cleaning the metals surfaces;
   4. is the destruction of metals under the action of external factors;
   
   
3. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Zn -> H₂ + Zn²⁺
   2. Ni(CO)₄ -> Ni + CO
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. ZnO + CO -> Zn + CO₂
   
   
4. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. a gas is released at both corrosion of zinc and aluminum;
   3. a gas is released only the corrosion of zinc;
   4. a gas is released only the corrosion of aluminum;
   
   
5. The aluminum plate:
   1. was degreased in sodium hydroxide solution;
   2. the volume is measured before and after immersing it in NaOH;
   3. was involved in the volumetric method of corrosion analysis
   4. was involved in the gravimetric method of corrosion analysis
   
   

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. a fost corodata īn solutie sulfuric;
   3. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   4. suprafata 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. poate fi redusa prin galvanizare;
   3. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   4. este distrugerea metalelor sub actiunea factorilor externi;
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Zn -> H₂ + Zn²⁺
   2. Ni(CO)₄ -> Ni + CO
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. ZnO + CO -> Zn + CO₂
   5. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
4. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   3. un gaz este eliberat numai la corodarea zincului;
   4. un gaz este eliberat numai la corodarea aluminiului;
   
   
5. Pentru placa de aluminiu:
   1. a fost degresata īn solutie de hidroxid de sodiu;
   2. volumul se masoara īnainte si dupa imersia īn NaOH;
   3. a fost implicata īn metoda volumetrica de analiza a coroziunii
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   
   

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. was involved in the gravimetric method of corrosion analysis
   4. the surface is measured before and after immersing it in H₂SO₄;
   
   
2. Which of the following reactions may be called as of corrosion:
   1. ZnO + CO -> Zn + CO₂
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
3. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. a gas is released only the corrosion of zinc;
   3. a gas is released at both corrosion of zinc and aluminum;
   4. a gas is released only the corrosion of aluminum;
   
   
4. The aluminum plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. was corroded in sodium hydroxide solution;
   3. the volume is measured before and after immersing it in NaOH;
   4. was involved in the volumetric method of corrosion analysis
   
   
5. Corrosion of metals:
   1. takes place merely from exposure to moisture in air;
   2. can be reduced by electroplating;
   3. is the protection in time to chemical agents;
   4. is the destruction of metals under the action of external factors;
   
   

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

1. 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. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   
   
2. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + CO -> Zn + CO₂
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
3. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. un gaz este eliberat numai la corodarea zincului;
   3. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   4. un gaz este eliberat numai la corodarea aluminiului;
   5. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   
   
4. Pentru placa de aluminiu:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. a fost corodata īn solutie de hidroxid de sodiu;
   3. volumul se masoara īnainte si dupa imersia īn NaOH;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   5. masa este masurata īnainte si dupa imersia īn NaOH;
   
   
5. Coroziunea metalelor:
   1. are loc pur si simplu prin expunerea la umiditate īn aer;
   2. poate fi redusa prin galvanizare;
   3. este protectia de durata impotriva agentilor chimici;
   4. este distrugerea metalelor sub actiunea factorilor externi;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

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 anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   3. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   4. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   
   
2. Electrical conductivity of nickel salts solutions:
   1. is relatively small;
   2. is relatively high;
   3. is improved by salts additions;
   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. much higher than the calculated theoretical one;
   3. lower than the calculated theoretical one;
   4. proportional with the nickel plating time;
   
   
4. Theoretical mass of nickel deposited is calculated using:
   1. the electrolysis law;
   2. law of mass action;
   3. the conservation of the number of atoms for each element law;
   4. the conservation of the energy law;
   
   
5. The intensity of the current:
   1. affect only the quality of the nickel deposition;
   2. does not affect the quality nor the quantity of the nickel deposition;
   3. affect only the quantity of the nickel deposition;
   4. should be adjusted by the technicians, we have nothing to do there;
   
   

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 anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   3. la catod (-), īn contact cu piesa metalica, Ni²⁺ + 2e^- -> Ni⁰
   4. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   5. la anod (+), īn legatura cu piesa de nichel, Ni²⁺ + 2e^- -> Ni⁰
   
   
2. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este relativ mica;
   2. este relativ mare;
   3. este īmbunatatita prin adaosuri de saruri;
   4. este redusa prin adaosuri de saruri;
   5. depinde de potentialul sursei utilizate;
   
   
3. Este de asteptat ca masa de nichel depus sa fie:
   1. proportionala cu intensitatea curentului utilizat;
   2. mult mai mare decāt cea teoretica calculata;
   3. mai mica decāt cea teoretica calculata;
   4. proportionala cu timpul de nichelare;
   5. mai mare decāt cea teoretica calculata;
   
   
4. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea electrolizei;
   2. legea actiunii maselor;
   3. conservarea numarului de atomi pentru fiecare element;
   4. legea conservarii energiei;
   
   
5. Intensitatea curentului:
   1. afecteaza numai calitatea depunerii nichelului;
   2. nu afecteaza calitatea nici cantitatea nichelului depus;
   3. afecteaza numai cantitatea de nichel depus;
   4. ar trebui sa fie ajustata de catre tehnicieni, nu avem nimic de a face acolo;
   5. trebuie sa fie calculata īnainte de a īncepe experimentul;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   2. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   3. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   4. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the anode: O^2- - 2e^- -> O₂⁰
   
   
2. Theoretical mass of nickel deposited is calculated using:
   1. solutions laws;
   2. perfect gas law;
   3. the conservation of the energy law;
   4. law of mass action;
   
   
3. The intensity of the current:
   1. should be adjusted by the technicians, we have nothing to do there;
   2. affect only the quality of the nickel deposition;
   3. is to be calculated before to start the experiment;
   4. is to be adjusted when the experiment starts;
   
   
4. Electrical conductivity of nickel salts solutions:
   1. is relatively small;
   2. depends on the intensity of the current used;
   3. is reduced by salts additions;
   4. is improved by salts additions;
   
   
5. It is expected to have a mass of nickel deposited:
   1. inversely proportional with the intensity of the current used;
   2. inversely proportional with the surface of the sample;
   3. proportional with the surface of the sample;
   4. higher 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 anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   2. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   3. la catod (-), īn contact cu piesa metalica, Ni²⁺ + 2e^- -> Ni⁰
   4. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la anod: O^2- - 2e^- -> O₂⁰
   
   
2. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea solutilor;
   2. legea gazelor perfecte;
   3. legea conservarii energiei;
   4. legea actiunii maselor;
   
   
3. Intensitatea curentului:
   1. ar trebui sa fie ajustata de catre tehnicieni, nu avem nimic de a face acolo;
   2. afecteaza numai calitatea depunerii nichelului;
   3. trebuie sa fie calculata īnainte de a īncepe experimentul;
   4. trebuie sa fie ajustata cand se incepe experimentul;
   5. se calculeaza dupa efectuarea experimentului;
   
   
4. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este relativ mica;
   2. depinde de intensitatea curentului utilizat;
   3. este redusa prin adaosuri de saruri;
   4. este īmbunatatita prin adaosuri de saruri;
   
   
5. Este de asteptat ca masa de nichel depus sa fie:
   1. invers proportionala cu intensitatea curentului utilizat;
   2. invers proportionala cu suprafata probei;
   3. proportionala cu suprafata probei;
   4. mai mare decāt cea teoretica calculata;
   5. invers proportional cu timpul de nichelare;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. It is expected to have a mass of nickel deposited:
   1. proportional with the surface of the sample;
   2. inversely proportional with the intensity of the current used;
   3. much lower than the calculated theoretical one;
   4. much higher than the calculated theoretical one;
   
   
2. The intensity of the current:
   1. affect only the quality of the nickel deposition;
   2. should be adjusted by the technicians, we have nothing to do there;
   3. is to be calculated after conducting the experiment;
   4. does not affect the quality nor the quantity of the nickel deposition;
   
   
3. Theoretical mass of nickel deposited is calculated using:
   1. solutions laws;
   2. the electrolysis law;
   3. the conservation of the number of atoms for each element law;
   4. law of mass action;
   
   
4. 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
   
   
5. Electrical conductivity of nickel salts solutions:
   1. depends on the potential of the source used;
   2. is reduced by salts additions;
   3. is relatively high;
   4. is relatively small;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Este de asteptat ca masa de nichel depus sa fie:
   1. proportionala cu suprafata probei;
   2. invers proportionala cu intensitatea curentului utilizat;
   3. mult mai mica decāt cea teoretica calculata;
   4. mult mai mare decāt cea teoretica calculata;
   5. invers proportional cu timpul de nichelare;
   
   
2. Intensitatea curentului:
   1. afecteaza numai calitatea depunerii nichelului;
   2. ar trebui sa fie ajustata de catre tehnicieni, nu avem nimic de a face acolo;
   3. se calculeaza dupa efectuarea experimentului;
   4. nu afecteaza calitatea nici cantitatea nichelului depus;
   5. trebuie sa fie calculata īnainte de a īncepe experimentul;
   
   
3. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea solutilor;
   2. legea electrolizei;
   3. conservarea numarului de atomi pentru fiecare element;
   4. legea actiunii maselor;
   5. legea conservarii energiei;
   
   
4. 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
   
   
5. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. depinde de potentialul sursei utilizate;
   2. este redusa prin adaosuri de saruri;
   3. este relativ mare;
   4. este relativ mica;
   5. este īmbunatatita prin adaosuri de saruri;