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

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

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

1. Ceata observata īn timpul experimentului se datoreaza:
   1. experimentului nostru proiectat pentru a captura produsul de reactie;
   2. prezentei amoniacului;
   3. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   4. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   
   
2. Cronometrul este utilizat īn experimentul pentru:
   1. masurarea timpului de difuzie;
   2. sa ne tina ocupati;
   3. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   4. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   
   
3. 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. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   
   
4. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca ionii si nu ca si molecule neutre;
   2. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   3. energia medie sau viteza medie a fiecarei specii implicate;
   4. latimea tubului si nu lungimea tubului;
   
   
5. Pozitia inelului īn experimentul este dependenta de:
   1. lungimea tubului si latimea tubului;
   2. energia medie sau viteza medie a fiecarei specii implicate;
   3. propagarea speciilor ca ionii si nu ca si molecule neutre;
   4. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   5. viteza la moda sau energia la moda a fiecarei specii implicate;
   
   

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

1. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. are considered to be at the same temperature, but may have different energies;
   2. all are moving in an arbitrary direction;
   3. all have same energy;
   4. all have same speed;
   
   
2. At the ends of the tube following equilibrium reactions occurs:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₃ + HCl \=\ NH₄Cl
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
3. 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. unproper illumination in the laboratory or our breathing;
   4. formation of ammonium chloride;
   
   
4. We may say the followings:
   1. the molecules have speeds in all gaseous, liquid and solid states;
   2. the kinetic energy of a molecule is affected by temperature only;
   3. diffusion process appears in all gaseous, liquid and solid states;
   4. the molecules have energy only in gaseous state;
   
   
5. The position of the ring in the experiment is dependent on:
   1. the average energy or average speed of each involved species;
   2. the virtual speeds and not the real speeds of each involved species;
   3. the width of the tube and not of the length of the tube;
   4. the real speeds and not the virtual speeds of each involved species;
   
   

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

1. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   2. toate se īndreapta īntr-o directie arbitrara;
   3. toate au aceeasi energie;
   4. toate au aceeasi viteza;
   5. toate se deplaseaza īn aceeasi directie;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₃ + HCl \=\ NH₄Cl
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   5. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   
   
3. Ceata observata īn timpul experimentului se datoreaza:
   1. experimentului nostru proiectat pentru a captura produsul de reactie;
   2. prezentei amoniacului;
   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. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   2. energia cinetica a unei molecule este afectata de numai temperatura;
   3. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   4. moleculele au energie numai īn stare gazoasa;
   5. energia cinetica a unei molecule este afectata de temperatura si presiune;
   
   
5. Pozitia inelului īn experimentul este dependenta de:
   1. energia medie sau viteza medie a fiecarei specii implicate;
   2. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   3. latimea tubului si nu lungimea tubului;
   4. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   
   

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

1. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory and our breathing;
   2. formation of ammonium chloride;
   3. our experiment designed to trap the product of the reaction;
   4. presence of the chlorine;
   
   
2. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. are considered to be at the same temperature, but may have different speeds;
   2. all have same energy;
   3. all are moving in an arbitrary direction;
   4. all are moving in the same direction;
   
   
3. At the ends of the tube following equilibrium reactions occurs:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   3. H⁺ + HO^- \=\ H₂O
   4. H₂O \=\ H⁺ + HO^-
   
   
4. The position 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 propagation of the species as ions and not as neutral molecules;
   3. the mode energy or mode speed of each involved species;
   4. the average energy or average speed of each involved species;
   
   
5. The time to the formation of the ring in the experiment is dependent on:
   1. the concentrations of the solutions used;
   2. the width of the tube and not of the length of the tube;
   3. the average energy or average speed of each involved species;
   4. the virtual speeds and not the real speeds of each involved species;
   
   

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

1. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   2. formarea clorurii de amoniu;
   3. experimentului nostru proiectat pentru a captura produsul de reactie;
   4. prezentei clorului;
   5. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   
   
2. 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;
   
   
3. La capetele tubului urmatoarele reactii de echilibru apar:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   3. H⁺ + HO^- \=\ H₂O
   4. H₂O \=\ H⁺ + HO^-
   
   
4. Pozitia inelului īn experimentul este dependenta de:
   1. latimea tubului si nu lungimea tubului;
   2. propagarea speciilor ca ionii si nu ca si molecule neutre;
   3. viteza la moda sau energia la moda a fiecarei specii implicate;
   4. energia medie sau viteza medie a fiecarei specii implicate;
   5. concentratiile solutiilor utilizate;
   
   
5. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. concentratiile solutiilor utilizate;
   2. latimea tubului si nu lungimea tubului;
   3. energia medie sau viteza medie a fiecarei specii implicate;
   4. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   
   

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

1. The time to the formation of the ring in the experiment is dependent on:
   1. the virtual speeds and not the real speeds of each involved species;
   2. the real speeds and not the virtual speeds of each involved species;
   3. the propagation of the species as neutral molecules and not as ions;
   4. the length of the tube and not of the width of the tube;
   
   
2. At the ends of the tube following equilibrium reactions occurs:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. NH₃ + HCl \=\ NH₄Cl
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
3. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. are considered to be at the same temperature, but may have different energies;
   2. are considered to be at the same temperature, but may have different speeds;
   3. all have same speed;
   4. all are moving in the same direction;
   
   
4. We may say the followings:
   1. the kinetic energy of a molecule is affected by temperature and pressure;
   2. the molecules have energy in all gaseous, liquid and solid states;
   3. the molecules have speeds only in gaseous state;
   4. diffusion process appears only in gaseous and liquid states;
   
   
5. The position of the ring in the experiment is dependent on:
   1. the propagation of the species as neutral molecules and not as ions;
   2. the concentrations of the solutions used;
   3. the length of the tube and the width of the tube;
   4. the virtual speeds and not the real speeds of each involved species;
   
   

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

1. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   2. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   3. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   4. lungimea tubului si nu latimea tubului;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. NH₃ + HCl \=\ NH₄Cl
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
3. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   2. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   3. toate au aceeasi viteza;
   4. toate se deplaseaza īn aceeasi directie;
   
   
4. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. energia cinetica a unei molecule este afectata de temperatura si presiune;
   2. moleculele au energie īn toate starile gazoasa, lichida si solida;
   3. moleculele au viteze numai īn stare gazoasa;
   4. proces de difuzie apare numai īn stare gazoasa si lichida;
   
   
5. Pozitia inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   2. concentratiile solutiilor utilizate;
   3. lungimea tubului si latimea tubului;
   4. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   
   

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

1. The chronometer is used in the experiment for:
   1. extracting the information necessary to calculate the diffusion coefficients;
   2. measuring of the diffusion time;
   3. indication of the moment when we should pay attention to the experiment;
   4. to keep us busy;
   
   
2. The position of the ring in the experiment is dependent on:
   1. the real speeds and not the virtual speeds of each involved species;
   2. the speed of diffusion of each involved species;
   3. the average energy or average speed of each involved species;
   4. the length of the tube and not of the width of the tube;
   
   
3. The fog observed during the experiment is due to:
   1. presence of the chlorine;
   2. formation of ammonium chloride;
   3. unproper illumination in the laboratory or our breathing;
   4. our experiment designed to trap the product of the reaction;
   
   
4. At the ends of the tube following equilibrium reactions occurs:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. NH₃ + HCl \=\ NH₄Cl
   3. H⁺ + HO^- \=\ H₂O
   4. H₂O \=\ H⁺ + HO^-
   
   
5. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. are considered to be at the same temperature, but may have different energies;
   2. all have same energy;
   3. are considered to be at the same temperature, but may have different speeds;
   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. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   2. masurarea timpului de difuzie;
   3. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   4. sa ne tina ocupati;
   5. sincronizarea timpilor de difuzie;
   
   
2. Pozitia inelului īn experimentul este dependenta de:
   1. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   2. viteza de difuzie a fiecarei specii implicate;
   3. energia medie sau viteza medie a fiecarei specii implicate;
   4. lungimea tubului si nu latimea tubului;
   5. latimea tubului si nu lungimea tubului;
   
   
3. Ceata observata īn timpul experimentului se datoreaza:
   1. prezentei clorului;
   2. formarea clorurii de amoniu;
   3. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   4. experimentului nostru proiectat pentru a captura produsul de reactie;
   
   
4. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. NH₃ + HCl \=\ NH₄Cl
   3. H⁺ + HO^- \=\ H₂O
   4. H₂O \=\ H⁺ + HO^-
   
   
5. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   2. toate au aceeasi energie;
   3. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   4. toate se īndreapta īntr-o directie arbitrara;
   
   

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 obtained after conducting of the experiment;
   2. a relation which may involve some constants dependent of gas composition;
   3. a relation between an unlimited number of state parameters;
   4. a relation between an certain number of state parameters;
   
   
2. For gaseous state:
   1. the pressure is unchanged when a chemical reaction occurs;
   2. it exists an equation for all, p · V = n · R · T;
   3. the pressure depends on the model which are used to approximate it;
   4. the pressure is subject to change when a chemical reaction occurs;
   
   
3. In the laboratory were studied:
   1. increasing of the temperature of a solid mass when was heated;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   3. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   4. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KNO₃ -> KNO₂ + O₂;
   2. opening a bubble water bottle;
   3. H₂O + O₂ -> H₂O₂;
   4. KClO₃ -> KCl + O₂;
   
   
5. 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. the ideal model of a gas approximated the best the behavior of the released gas;
   4. we possess enough information to decide what gas was released from the reaction;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. o relatie obtinut dupa efectuarea experimentului;
   2. o relatie care poate implica unele constante dependente de compozitia gazului;
   3. o relatie īntre un numar nelimitat de parametri de stare;
   4. o relatie īntre un anumit numar de parametri de stare;
   
   
2. Pentru stare gazoasa:
   1. presiunea este neschimbata cānd apare o reactie chimica;
   2. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   3. presiunea depinde de modelul care este utilizat pentru o aproxima;
   4. presiunea se pot modifica atunci cānd apare o reactie chimica;
   
   
3. Īn laborator s-au studiat:
   1. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   3. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   
   
4. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KNO₃ -> KNO₂ + O₂;
   2. deschiderea unei sticle de apa cu bule;
   3. H₂O + O₂ -> H₂O₂;
   4. KClO₃ -> KCl + O₂;
   
   
5. 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. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   4. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   

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

1. A state equation for a real gas is:
   1. usable in the laboratory, but is not to be used somewhere else;
   2. a relation derived to approximate the relation between state parameters;
   3. a relation obtained after conducting of the experiment;
   4. a relation which may involve some constants dependent of gas composition;
   
   
2. For gaseous state:
   1. the pressure is approximately the same as in liquid state;
   2. the pressure depends on the model which are used to approximate it;
   3. we need to take supplementary precautions in the laboratory;
   4. the pressure is subject to change when a chemical reaction occurs;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   2. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   3. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   4. H₂O₂ -> H₂O + O₂;
   
   
4. The values taken from the experiment conducted in the laboratory indicated that:
   1. air were released as result of the decomposition;
   2. ozone were released as result of the decomposition;
   3. oxigen were released as result of the decomposition;
   4. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   
   
5. In the laboratory were studied:
   1. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   3. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   4. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   2. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   3. o relatie obtinut dupa efectuarea experimentului;
   4. o relatie care poate implica unele constante dependente de compozitia gazului;
   
   
2. Pentru stare gazoasa:
   1. presiunea este aproximativ aceeasi ca si īn stare lichida;
   2. presiunea depinde de modelul care este utilizat pentru o aproxima;
   3. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   4. presiunea se pot modifica atunci cānd apare o reactie chimica;
   5. presiunea este exact la fel ca si īn stare lichida;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   2. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   3. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   4. H₂O₂ -> H₂O + O₂;
   
   
4. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. aer a fost eliberat ca urmare a descompunerii;
   2. ozonul au fost eliberat ca urmare a descompunerii;
   3. oxigenul au fost eliberat ca urmare a descompunerii;
   4. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   5. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   
   
5. Īn laborator s-au studiat:
   1. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   3. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   4. 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. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   2. KCl + O₂ -> KClO₃;
   3. Ag₂O -> Ag + O₂;
   4. Ag + O₂ -> Ag₂O;
   
   
2. For gaseous state:
   1. the pressure is subject to change when a chemical reaction occurs;
   2. the pressure is approximately the same as in liquid state;
   3. the pressure is much lower than in liquid state;
   4. we need to take supplementary precautions in the laboratory;
   
   
3. A state equation for a real gas is:
   1. a relation which takes into account certain deviations from the ideal model;
   2. a relation which is always true, independent of the values of the state parameters;
   3. a relation obtained after conducting of the experiment;
   4. a relation between an unlimited number of state parameters;
   
   
4. In the laboratory were studied:
   1. increasing of the pressure of a gas when was heated;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   3. the lost of the mass of a solid as result of producing of some gas;
   4. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   
   
5. 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 worst the behavior of the released gas;
   3. the ideal model of a gas approximated the best the behavior of the released gas;
   4. air were released as result of the decomposition;
   
   

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. KCl + O₂ -> KClO₃;
   3. Ag₂O -> Ag + O₂;
   4. Ag + O₂ -> Ag₂O;
   
   
2. Pentru stare gazoasa:
   1. presiunea se pot modifica atunci cānd apare o reactie chimica;
   2. presiunea este aproximativ aceeasi ca si īn stare lichida;
   3. presiunea este mult mai mica decāt īn stare lichida;
   4. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   
   
3. O ecuatie de stare pentru un gaz real este:
   1. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   2. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   3. o relatie obtinut dupa efectuarea experimentului;
   4. o relatie īntre un numar nelimitat de parametri de stare;
   
   
4. Īn laborator s-au studiat:
   1. cresterea presiunii unui gaz cānd s-a īncalzit;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   3. pierdut din masa de solid ca urmare a producerii unor gaze;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   
   
5. 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 rau comportamentul gazului eliberat;
   3. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   4. aer a fost eliberat ca urmare a descompunerii;
   
   

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

1. The values taken from the experiment conducted in the laboratory indicated that:
   1. we possess enough information to decide what gas was released from the reaction;
   2. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   3. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   4. the ideal model of a gas approximated the best the behavior of the released gas;
   
   
2. For gaseous state:
   1. the pressure is approximately the same as in liquid state;
   2. the pressure is much higher than in liquid state;
   3. the pressure is exactly the same as in liquid state;
   4. the pressure depends on the model which are used to approximate it;
   
   
3. In the laboratory were studied:
   1. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   2. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   4. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   
   
4. A state equation for a real gas is:
   1. a relation obtained after conducting of the experiment;
   2. a relation which takes into account certain deviations from the ideal model;
   3. a relation between an certain number of state parameters;
   4. a relation which may involve some constants dependent of gas composition;
   
   
5. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. opening a bubble water bottle;
   2. H₂O + O₂ -> H₂O₂;
   3. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   2. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   3. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   5. oxigenul au fost eliberat ca urmare a descompunerii;
   
   
2. Pentru stare gazoasa:
   1. presiunea este aproximativ aceeasi ca si īn stare lichida;
   2. presiunea este mult mai mare decāt īn stare lichida;
   3. presiunea este exact la fel ca si īn stare lichida;
   4. presiunea depinde de modelul care este utilizat pentru o aproxima;
   
   
3. Īn laborator s-au studiat:
   1. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   2. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   4. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   5. pierdut din masa de solid ca urmare a producerii unor gaze;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. o relatie obtinut dupa efectuarea experimentului;
   2. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   3. o relatie īntre un anumit numar de parametri de stare;
   4. o relatie care poate implica unele constante dependente de compozitia gazului;
   
   
5. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. deschiderea unei sticle de apa cu bule;
   2. H₂O + O₂ -> H₂O₂;
   3. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   

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

1. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   2. air were released as result of the decomposition;
   3. ozone were released as result of the decomposition;
   4. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   
   
2. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. Ag + O₂ -> Ag₂O;
   2. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   3. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   4. KClO₃ -> KCl + O₂;
   
   
3. A state equation for a real gas is:
   1. usable in the laboratory, but is not to be used somewhere else;
   2. a relation which is always true, independent of the values of the state parameters;
   3. a relation obtained after conducting of the experiment;
   4. a relation between an certain number of state parameters;
   
   
4. In the laboratory were studied:
   1. 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 oxygen is released;
   4. the producing of some gas as result of a lost of the mass of a solid;
   
   
5. For gaseous state:
   1. the pressure is subject to change when a chemical reaction occurs;
   2. the pressure depends on the model which are used to approximate it;
   3. we need to take supplementary precautions in the laboratory;
   4. the pressure is unchanged when a chemical reaction occurs;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. aer a fost eliberat ca urmare a descompunerii;
   3. ozonul au fost eliberat ca urmare a descompunerii;
   4. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. Ag + O₂ -> Ag₂O;
   2. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   3. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   4. KClO₃ -> KCl + O₂;
   
   
3. O ecuatie de stare pentru un gaz real este:
   1. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   2. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   3. o relatie obtinut dupa efectuarea experimentului;
   4. o relatie īntre un anumit numar de parametri de stare;
   5. o relatie īntre un numar nelimitat de parametri de stare;
   
   
4. 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 oxigenul este eliberat;
   4. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   
   
5. Pentru stare gazoasa:
   1. presiunea se pot modifica atunci cānd apare o reactie chimica;
   2. presiunea depinde de modelul care este utilizat pentru o aproxima;
   3. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   4. presiunea este neschimbata cānd apare o reactie chimica;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When aluminum is identified:
   1. using of alizarin along with ammonium hidroxide provide a more selective indication about the presence of aluminum;
   2. is identified as Al³⁺ cation;
   3. using of alizarin along with ammonium hidroxide provide a red colored complex;
   4. is identified as Al²⁺ cation;
   
   
2. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
3. The paper requires before analysis of the sample:
   1. to be burned;
   2. to be dry;
   3. to be cut in small pieces;
   4. to be moistened with an electrolyte;
   
   
4. When lead is identified:
   1. precautions should be made for toxic wastes disposal;
   2. a heat release is observed;
   3. the reactions used clearly indicates its presence;
   4. a red-brown complex appears;
   
   
5. When the electrical circuit is closed:
   1. water dissociation is inhibited;
   2. elements from the solution are passed into sample as metals;
   3. surface of the sample is fastly covered by a protecting shield of electrons;
   4. anions from the solution are passed into sample as metals;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd aluminiu este identificat:
   1. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un indiciu mai selectiv cu privire la prezenta aluminiului;
   2. este identificat ca cationul Al³⁺;
   3. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   4. este identificat ca cationul Al²⁺;
   
   
2. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   5. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
3. Hartia necesita ca īnainte de analiza probei:
   1. sa fie arsa;
   2. sa fie uscata;
   3. sa fie taiata īn bucati mici;
   4. sa fie umezita cu un electrolit;
   5. sa fie cantarita;
   
   
4. Cānd plumbul este identificat:
   1. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   2. se observa o eliberare de caldura;
   3. reactiile utilizate īn mod clar ii indica prezenta;
   4. apare un complex rosu-brun;
   
   
5. Cānd circuitul electric este īnchis:
   1. disocierea apei este inhibata;
   2. elemente din solutie sunt trecute īn proba ca metale;
   3. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   4. anionii din solutie sunt trecuti īn proba ca metale;
   5. cationii din solutie sunt trecuti īn proba ca metale;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The paper requires before analysis of the sample:
   1. to be cut in small pieces;
   2. to measure its surface;
   3. to be moistened with an electrolyte;
   4. to be acidified;
   
   
2. The electric charges after passing the metals into solution may be:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   
3. When the electrical circuit is closed:
   1. surface of the sample is fastly covered by a protecting shield of electrons;
   2. electric current avoids the sample and the paper;
   3. cations from the solution are passed into sample as metals;
   4. elements from the metals are passed into solution as cations;
   
   
4. When lead is identified:
   1. the reactions used clearly indicates its presence;
   2. a blue complex appears;
   3. interference of other ions may affect the outcome;
   4. dangerous substances are used;
   
   
5. Why moisten the paper with solution of sodium nitrate?
   1. to be cut easily with scissors;
   2. for the paper to work as isolator;
   3. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   4. for stopping after a while the chemical reaction that takes place;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Hartia necesita ca īnainte de analiza probei:
   1. sa fie taiata īn bucati mici;
   2. sa i se masoare suprafata;
   3. sa fie umezita cu un electrolit;
   4. sa fie acidulata;
   5. sa fie uscata;
   
   
2. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   
3. Cānd circuitul electric este īnchis:
   1. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   2. curent electric evita proba si hārtia;
   3. cationii din solutie sunt trecuti īn proba ca metale;
   4. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   5. curent electric trece prin proba si hārtie;
   
   
4. Cānd plumbul este identificat:
   1. reactiile utilizate īn mod clar ii indica prezenta;
   2. apare un complex albastru;
   3. interferenta altor ioni poate afecta rezultatul;
   4. sunt utilizate substante periculoase;
   
   
5. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa fie taiat cu usurinta cu foarfeca;
   2. pentru ca hartia sa actioneze ca izolator;
   3. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   4. pentru oprirea dupa un timp reactiei chimice care are loc;
   5. sa ne acomodam in a utiliza substante chimice;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When the electrical circuit is closed:
   1. electric current avoids the sample and the paper;
   2. elements from the metals are passed into solution as cations;
   3. elements from the metals are passed into solution as anions;
   4. water dissociation is inhibited;
   
   
2. The paper requires before analysis of the sample:
   1. to be dry;
   2. to be tested;
   3. to be acidified;
   4. to measure its surface;
   
   
3. This method of analysis of metals and alloys is:
   1. useful for alloys, not so useful for metals;
   2. a quantitative method of analysis;
   3. a gravimetric method of analysis;
   4. useful for both metals and alloys;
   
   
4. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   3. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
5. When lead is identified:
   1. interference of other ions may affect the outcome;
   2. a blue complex appears;
   3. a red-brown complex appears;
   4. dangerous substances are used;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd circuitul electric este īnchis:
   1. curent electric evita proba si hārtia;
   2. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   3. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   4. disocierea apei este inhibata;
   5. elemente din solutie sunt trecute īn proba ca metale;
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie uscata;
   2. sa fie testata;
   3. sa fie acidulata;
   4. sa i se masoare suprafata;
   5. sa fie cantarita;
   
   
3. Aceasta metoda de analiza de metale si aliaje este:
   1. utila pentru aliaje, nu atāt de utila pentru metale;
   2. o metoda cantitativa de analiza;
   3. o metoda gravimetrica de analiza;
   4. utila atāt pentru metale si aliaje;
   5. o metoda distructiva de analiza;
   
   
4. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   3. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   5. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   
5. Cānd plumbul este identificat:
   1. interferenta altor ioni poate afecta rezultatul;
   2. apare un complex albastru;
   3. apare un complex rosu-brun;
   4. sunt utilizate substante periculoase;
   5. apare un complex violet;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. useful for alloys, not so useful for metals;
   2. a quantitative method of analysis;
   3. useful for both metals and alloys;
   4. not useful for both metals and alloys;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. to be cut easily with scissors;
   2. for stopping after a while the chemical reaction that takes place;
   3. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   4. to accomodate ourselves to use chemicals;
   
   
3. When the electrical circuit is closed:
   1. water dissociation is inhibited;
   2. electric current passes the sample and the paper;
   3. surface of the sample is fastly covered by a protecting shield of electrons;
   4. elements from the solution are passed into sample as metals;
   
   
4. When aluminum is identified:
   1. is identified as Al¹⁺ cation;
   2. the presence of other ions may produce a false negative outcome;
   3. using of ammonium hidroxide is enough in order to have a clear guess about the presence of aluminum;
   4. there are many identification reactions possible;
   
   
5. The paper requires before analysis of the sample:
   1. to be tested;
   2. to be burned;
   3. to be weighted;
   4. to be cut in small pieces;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. utila pentru aliaje, nu atāt de utila pentru metale;
   2. o metoda cantitativa de analiza;
   3. utila atāt pentru metale si aliaje;
   4. nu este utila nici pentru metale nici pentru aliaje;
   5. prea veche pentru a fi utilizata īn prezent īn laborator;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa fie taiat cu usurinta cu foarfeca;
   2. pentru oprirea dupa un timp reactiei chimice care are loc;
   3. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   4. sa ne acomodam in a utiliza substante chimice;
   
   
3. Cānd circuitul electric este īnchis:
   1. disocierea apei este inhibata;
   2. curent electric trece prin proba si hārtie;
   3. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   4. elemente din solutie sunt trecute īn proba ca metale;
   5. anionii din solutie sunt trecuti īn proba ca metale;
   
   
4. Cānd aluminiu este identificat:
   1. este identificat ca cationul Al¹⁺;
   2. prezenta altor ioni poate produce un rezultat fals negativ;
   3. folosirea hidroxidului de amoniu este suficient pentru a avea indicii clare cu privire la prezenta aluminiului;
   4. exista multe reactii posibile de identificare;
   
   
5. Hartia necesita ca īnainte de analiza probei:
   1. sa fie testata;
   2. sa fie arsa;
   3. sa fie cantarita;
   4. sa fie taiata īn bucati mici;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. Why moisten the paper with solution of sodium nitrate?
   1. to provide cations for analysis;
   2. for the paper to work as isolator;
   3. to accomodate ourselves to use chemicals;
   4. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   
   
2. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   2. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   
   
3. When lead is identified:
   1. a red-brown complex appears;
   2. dangerous substances are used;
   3. a blue complex appears;
   4. a heat release is observed;
   
   
4. This method of analysis of metals and alloys is:
   1. a gravimetric method of analysis;
   2. useful for both metals and alloys;
   3. a destructive method of analysis;
   4. useful for pure metals, not so useful for alloys;
   
   
5. When the electrical circuit is closed:
   1. surface of the sample is fastly covered by a protecting shield of electrons;
   2. cations from the solution are passed into sample as metals;
   3. elements from the solution are passed into sample as metals;
   4. elements from the metals are passed into solution as anions;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru furniza cationi pentru analiza;
   2. pentru ca hartia sa actioneze ca izolator;
   3. sa ne acomodam in a utiliza substante chimice;
   4. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   5. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   
2. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   2. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   
   
3. Cānd plumbul este identificat:
   1. apare un complex rosu-brun;
   2. sunt utilizate substante periculoase;
   3. apare un complex albastru;
   4. se observa o eliberare de caldura;
   5. apare un complex violet;
   
   
4. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda gravimetrica de analiza;
   2. utila atāt pentru metale si aliaje;
   3. o metoda distructiva de analiza;
   4. utila pentru metale pure, nu atāt de utila pentru aliaje;
   
   
5. Cānd circuitul electric este īnchis:
   1. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   2. cationii din solutie sunt trecuti īn proba ca metale;
   3. elemente din solutie sunt trecute īn proba ca metale;
   4. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   5. curent electric evita proba si hārtia;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The following chemical reactions were used in the experiments:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. H₂O + CO₂ -> H₂CO₃
   3. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   4. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
2. Titration as a laboratory operation involves:
   1. a burette;
   2. a standard or referential reactive;
   3. a pH indicator that changes color depending on the pH of the solution;
   4. a pH-metter;
   
   
3. 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. something rarely encountered in chemistry;
   4. the point in which a reactive should be added in the reaction flask;
   
   
4. A redox process:
   1. is always fast and safe;
   2. involves changing of the aggregation 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: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
5. In the calculations:
   1. are necessary to establish the coefficients of the chemical reaction;
   2. are necessary to use some formulas expressing in different ways the concentration;
   3. are necessary to use our phones;
   4. are necessary to take some information from reagent bottles;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. H₂O + CO₂ -> H₂CO₃
   3. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   4. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   5. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
2. Titrarea ca o operatiune de laborator implica:
   1. o biureta;
   2. un standard sau reactiv de referinta;
   3. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   4. un pH-metru;
   5. o solutie de hidroxid de sodiu;
   
   
3. 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. ceva rar īntālnit īn chimie;
   4. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   5. folosit pentru a echilibra ecuatia;
   
   
4. Un proces redox:
   1. este īntotdeauna rapid si sigur;
   2. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   3. apare numai atunci cānd se amesteca substante gresit īn laborator;
   4. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
5. In calcule:
   1. este necesara stabilirea coeficientilor reactiei chimice;
   2. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   3. este necesar sa utilizam telefoanele;
   4. este necesar a se lua unele informatii de pe sticlele de reactivi;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the number of atoms for each element;
   2. the principle of the conservation of the energy;
   3. all glassware should be clean before, after and during the experiment;
   4. the liquid in the burette should be at the same level before and after conducting the experiment;
   
   
2. A redox process:
   1. involves a transfer of electrons from one atom or group of atoms to another;
   2. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. occurs only when we mix wrong substances in the laboratory;
   4. is always fast and safe;
   
   
3. In the calculations:
   1. are necessary to use our phones;
   2. are necessary to discuss with our colleagues;
   3. are necessary to use some formulas expressing in different ways the concentration;
   4. are necessary to draw the tables in our notebooks after completing of the experiment;
   
   
4. The indicator should be added:
   1. in large quantities, according to the principle 'only size matters';
   2. to indicate our safety limits when we dealt with chemicals;
   3. in small quantities, to avoid the errors in observations and in calculations;
   4. only at the suggestion of the supervisor;
   
   
5. Titration as a laboratory operation involves:
   1. a pH-metter;
   2. a sulphuric acid solution;
   3. an mixing of two ore more solutions;
   4. a standard or referential reactive;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii numarul de atomi pentru fiecare element;
   2. principiul conservarii energiei;
   3. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   4. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   
   
2. Un proces redox:
   1. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   2. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. apare numai atunci cānd se amesteca substante gresit īn laborator;
   4. este īntotdeauna rapid si sigur;
   
   
3. In calcule:
   1. este necesar sa utilizam telefoanele;
   2. este necesar sa discutam cu colegii;
   3. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   4. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   5. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   
   
4. Trebuie adaugat indicatorul:
   1. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   2. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   3. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   4. numai la sugestia supraveghetorului;
   5. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   
   
5. Titrarea ca o operatiune de laborator implica:
   1. un pH-metru;
   2. o solutie de acid sulfuric;
   3. amestecul a doua sau mai multe solutii;
   4. un standard sau reactiv de referinta;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. A redox process:
   1. involves a transfer of electrons from one atom or group of atoms to another;
   2. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   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
   
   
2. In the calculations:
   1. are necessary to use some formulas expressing in different ways the concentration;
   2. are necessary to take some information from reagent bottles;
   3. are necessary to discuss with our colleagues;
   4. are necessary to use our phones;
   
   
3. Titration as a laboratory operation involves:
   1. a burette;
   2. a pH indicator that changes color depending on the pH of the solution;
   3. an mixing of two ore more solutions;
   4. a natrium hydroxide solution;
   
   
4. Reactions between acids and bases:
   1. have as effect the change of the color of a solution;
   2. always have as a consequence the formation of a quantity of water;
   3. have as a consequence the dissolution of a salt;
   4. are always fast, taking place almost instantaneously;
   
   
5. The density of the solutions depends on:
   1. provider;
   2. time elapsed since were prepared;
   3. temperature;
   4. concentration;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Un proces redox:
   1. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   2. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   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. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   
   
2. In calcule:
   1. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   2. este necesar a se lua unele informatii de pe sticlele de reactivi;
   3. este necesar sa discutam cu colegii;
   4. este necesar sa utilizam telefoanele;
   
   
3. Titrarea ca o operatiune de laborator implica:
   1. o biureta;
   2. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   3. amestecul a doua sau mai multe solutii;
   4. o solutie de hidroxid de sodiu;
   5. masurarea masei;
   
   
4. Reactiile īntre acizi si baze:
   1. au ca efect schimbarea culorii unei solutii;
   2. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   3. au drept consecinta dizolvarea unei sari;
   4. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   
   
5. Densitatea solutiilor depinde de:
   1. furnizor;
   2. timpul scurs de cand au fost pregatite;
   3. temperatura;
   4. concentratie;
   5. presiune;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Titration as a laboratory operation involves:
   1. a mass measurement;
   2. a sulphuric acid solution;
   3. a burette;
   4. a pH-metter;
   
   
2. 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. always have as a consequence the formation of a quantity of water;
   4. are rarely useful, and even rarely used;
   
   
3. The density of the solutions depends on:
   1. provider;
   2. quantity;
   3. temperature;
   4. pressure;
   
   
4. 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. all glassware should be clean before and after conducting the experiment;
   
   
5. The indicator should be added:
   1. only at the suggestion of the supervisor;
   2. to provide a color change at equivalence point;
   3. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   4. only in special cases, when the burette is graded from its bottom to its top;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Titrarea ca o operatiune de laborator implica:
   1. masurarea masei;
   2. o solutie de acid sulfuric;
   3. o biureta;
   4. un pH-metru;
   
   
2. Reactiile īntre acizi si baze:
   1. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   2. au ca efect schimbarea culorii unei solutii;
   3. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   4. sunt rareori utile, si chiar mai rar utilizate;
   
   
3. Densitatea solutiilor depinde de:
   1. furnizor;
   2. cantitate;
   3. temperatura;
   4. presiune;
   
   
4. 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. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   5. principiul conservarii numarul de atomi pentru fiecare element;
   
   
5. Trebuie adaugat indicatorul:
   1. numai la sugestia supraveghetorului;
   2. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   3. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   4. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. 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 use our phones;
   4. are necessary to establish the coefficients of the chemical reaction;
   
   
2. The indicator should be added:
   1. to provide a color change at equivalence point;
   2. only in special cases, when the burette is graded from its bottom to its top;
   3. in small quantities, to avoid the errors in observations and in calculations;
   4. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   
   
3. The following chemical reactions were used in the experiments:
   1. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
4. Reactions between acids and bases:
   1. have as a consequence the dissolution of a salt;
   2. are rarely useful, and even rarely used;
   3. always have as a consequence the formation of a quantity of water;
   4. are always fast, taking place almost instantaneously;
   
   
5. The density of the solutions depends on:
   1. quantity;
   2. time elapsed since were prepared;
   3. provider;
   4. temperature;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. 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 necesar sa utilizam telefoanele;
   4. este necesara stabilirea coeficientilor reactiei chimice;
   
   
2. Trebuie adaugat indicatorul:
   1. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   2. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   3. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   4. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   5. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   
   
3. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
4. Reactiile īntre acizi si baze:
   1. au drept consecinta dizolvarea unei sari;
   2. sunt rareori utile, si chiar mai rar utilizate;
   3. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   4. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   
   
5. Densitatea solutiilor depinde de:
   1. cantitate;
   2. timpul scurs de cand au fost pregatite;
   3. furnizor;
   4. temperatura;
   5. concentratie;
   
   

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 + PO₄^3- -> HPO₄^2- + Cl^-
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   
   
2. In the laboratory were analyzed:
   1. the boiling point of the water;
   2. the softness of the water;
   3. the solubility of the water;
   4. the color of the water;
   
   
3. EDTA is used:
   1. as reagent for determining the hardness of the water;
   2. for indication of the equilibrium point in the reaction;
   3. for recharging of the resin for water softening;
   4. for complexing of Ca²⁺ and Mg²⁺ ions;
   
   
4. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
5. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   3. NaOH + Cl^- -> NaCl + HO^-
   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 partiala:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   5. HCl + HO^- -> H₂O+Cl^-
   
   
2. Īn laborator au fost analizate:
   1. punctul de fierbere al apei;
   2. moliciunea apei;
   3. solubilitatea apei;
   4. culoarea apei;
   
   
3. EDTA este utilizat:
   1. ca reactiv pentru determinarea duritatii apei;
   2. pentru indicarea punctului de echilibru īn reactie;
   3. pentru reīncarcarea rasinii la dedurizarea apei;
   4. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   3. NaOH + Cl^- -> NaCl + HO^-
   4. NaOH + NO₃^- -> NaNO₃ + HO^-
   5. NaOH + Cl⁺ -> NaCl + HO⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Cl^- -> NaCl + HO^-
   2. NaOH + NO₃^- -> NaNO₃ + HO^-
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   
   
2. We may say the followings:
   1. purification of the water may include labeling processes;
   2. purification of the water may include chemical processes;
   3. water is pure only when is taken from a good freshwater mountain stream;
   4. purification of the water may include physical processes;
   
   
3. EDTA is used:
   1. for complexing of Na¹⁺ and K¹⁺ ions;
   2. for safety precautions purposes;
   3. for recharging of the resin for water softening;
   4. for complexing of Ca²⁺ and Mg²⁺ ions;
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   2. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   
   
5. In the laboratory were analyzed:
   1. the acidity of the water;
   2. the color of the water;
   3. the softness of the water;
   4. the mass of the water;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + Cl^- -> NaCl + HO^-
   2. NaOH + NO₃^- -> NaNO₃ + HO^-
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   
   
2. Putem spune urmatoarele:
   1. purificarea apei poate include procesele de etichetare;
   2. purificarea apei poate include procese chimice;
   3. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   4. purificarea apei poate include procedee fizice;
   
   
3. EDTA este utilizat:
   1. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   2. ca masura de siguranta;
   3. pentru reīncarcarea rasinii la dedurizarea apei;
   4. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   2. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   
   
5. Īn laborator au fost analizate:
   1. aciditatea apei;
   2. culoarea apei;
   3. moliciunea apei;
   4. masa apei;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. In the laboratory were analyzed:
   1. the concentration of the water;
   2. the color of the water;
   3. the mass of the water;
   4. the alkalinity of the water;
   
   
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 + HCOO^- -> HCOONa + HO^-
   4. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   
   
3. We may say the followings:
   1. purification of the water may include chemical processes;
   2. water is good for drinking, it is nothing to be analysed;
   3. natural water may contain organic matter and living organisms;
   4. water is pure only when is taken from a good freshwater mountain stream;
   
   
4. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   2. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   3. HCl + CO₃^2- -> HCO₃^- + Cl^-
   4. HCl + HO^- -> H₂O + Cl^-
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. hardness;
   2. mineral acidity;
   3. color;
   4. purity;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Īn laborator au fost analizate:
   1. concentratia apei;
   2. culoarea apei;
   3. masa apei;
   4. alcalinitatea apei;
   
   
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 + HCOO^- -> HCOONa + HO^-
   4. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   
   
3. Putem spune urmatoarele:
   1. purificarea apei poate include procese chimice;
   2. apa este buna pentru consum, nu este nimic de a fi analizat;
   3. apa naturala poate contine materie organica si organisme vii;
   4. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   5. apa este un solvent polar bun;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   2. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   3. HCl + CO₃^2- -> HCO₃^- + Cl^-
   4. HCl + HO^- -> H₂O+Cl^-
   5. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. duritate;
   2. aciditate minerala;
   3. culoare;
   4. puritate;
   5. alcalinitate permanenta;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + HCOO⁺ -> HCOONa + HO⁺
   4. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   
   
2. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   
   
3. We may say the followings:
   1. water is good for drinking, it is nothing to be analysed;
   2. purification of the water may include chemical processes;
   3. when water contains dissolved minerals and gases is bad for drinking;
   4. water is a good polar solvent;
   
   
4. EDTA is used:
   1. as reagent for determining the hardness of the water;
   2. for complexing of Na¹⁺ and K¹⁺ ions;
   3. for indication of the equilibrium point in the reaction;
   4. for safety precautions purposes;
   
   
5. In the laboratory the water were:
   1. softened using the resin column;
   2. hardened using the resin column;
   3. acidified for drinking purposes;
   4. biologically purified using the resin column;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + HCOO⁺ -> HCOONa + HO⁺
   4. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   5. NaOH + HCOO^- -> HCOONa + HO^-
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   
   
3. Putem spune urmatoarele:
   1. apa este buna pentru consum, nu este nimic de a fi analizat;
   2. purificarea apei poate include procese chimice;
   3. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   4. apa este un solvent polar bun;
   5. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   
   
4. EDTA este utilizat:
   1. ca reactiv pentru determinarea duritatii apei;
   2. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   3. pentru indicarea punctului de echilibru īn reactie;
   4. ca masura de siguranta;
   
   
5. In laborator apa au fost:
   1. dedurizata folosind coloana de rasina;
   2. calita folosind coloana de rasina;
   3. acidulata pentru baut;
   4. purificata biologic utilizānd coloana de rasina;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   2. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   3. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   4. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   
2. For a water sample following measures may be quantitatively expressed:
   1. mineral acidity;
   2. total acidity;
   3. purity;
   4. permanent alkalinity;
   
   
3. We may say the followings:
   1. purification of the water may include chemical processes;
   2. water is a good polar solvent;
   3. purification of the water may include physical processes;
   4. when water contains dissolved minerals and gases is bad for drinking;
   
   
4. EDTA is used:
   1. for safety precautions purposes;
   2. as reagent for determining the hardness of the water;
   3. for complexing of Ca²⁺ and Mg²⁺ ions;
   4. for indication of the equilibrium point in the reaction;
   
   
5. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   2. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   3. HCl + HO^- -> H₂O + Cl^-
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   2. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   3. NaOH + CO₃^2- -> HCO₃^- + HO^-
   4. NaOH + HCOO⁺ -> HCOONa + HO⁺
   5. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   
2. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate minerala;
   2. aciditate totala;
   3. puritate;
   4. alcalinitate permanenta;
   
   
3. Putem spune urmatoarele:
   1. purificarea apei poate include procese chimice;
   2. apa este un solvent polar bun;
   3. purificarea apei poate include procedee fizice;
   4. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   5. purificarea apei poate include procesele de etichetare;
   
   
4. EDTA este utilizat:
   1. ca masura de siguranta;
   2. ca reactiv pentru determinarea duritatii apei;
   3. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   4. pentru indicarea punctului de echilibru īn reactie;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   2. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   3. HCl + HO^- -> H₂O + Cl^-
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   5. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   

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

1. Which of the following reactions may be called as of corrosion:
   1. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. Al₂O₃ + NaOH -> NaAlO₂
   4. ZnO + CO -> Zn + CO₂
   
   
2. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. always the metal changes its oxidation state;
   3. a gas is released at both corrosion of zinc and aluminum;
   4. a gas is released only the corrosion of aluminum;
   
   
3. The zinc plate:
   1. was degreased in sulfuric acid solution;
   2. the mass is measured before and after immersing it in H₂SO₄;
   3. was corroded in sulfuric solution;
   4. was involved in the volumetric method of corrosion analysis
   
   
4. Corrosion of metals:
   1. is the destruction of metals under the action of external factors;
   2. can be reduced by passivation;
   3. is helping in the process of cleaning the metals surfaces;
   4. takes place merely from exposure to moisture in air;
   
   
5. The aluminum plate:
   1. was involved in the volumetric method of corrosion analysis
   2. the mass is measured before and after immersing it in NaOH;
   3. was degreased in sodium hydroxide solution;
   4. the volume is measured before and after immersing it in NaOH;
   
   

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

1. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. Al₂O₃ + NaOH -> NaAlO₂
   4. ZnO + CO -> Zn + CO₂
   5. Fe₂O₃ + CO -> Fe + CO₂
   
   
2. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. īntotdeauna metalul isi schimba starea de oxidare;
   3. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   4. un gaz este eliberat numai la corodarea aluminiului;
   
   
3. Pentru placa de zinc:
   1. a fost degresata īn solutie de acid sulfuric;
   2. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   3. a fost corodata īn solutie sulfuric;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   
4. Coroziunea metalelor:
   1. este distrugerea metalelor sub actiunea factorilor externi;
   2. poate fi redusa prin pasivare;
   3. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   4. are loc pur si simplu prin expunerea la umiditate īn aer;
   5. poate furniza materii prime utile pentru analiza;
   
   
5. Pentru placa de aluminiu:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. masa este masurata īnainte si dupa imersia īn NaOH;
   3. a fost degresata īn solutie de hidroxid de sodiu;
   4. volumul se masoara īnainte si dupa imersia īn NaOH;
   
   

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

1. Corrosion of metals:
   1. is the protection in time to chemical agents;
   2. takes place merely from exposure to moisture in air;
   3. can be reduced by passivation;
   4. can be reduced by electroplating;
   
   
2. The zinc plate:
   1. the volume is measured before and after immersing it in H₂SO₄;
   2. the mass is measured before and after immersing it in H₂SO₄;
   3. was involved in the volumetric method of corrosion analysis
   4. was involved in the gravimetric method of corrosion analysis
   
   
3. Which of the following reactions may be called as of corrosion:
   1. Ni(CO)₄ -> Ni + CO
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. ZnO + CO -> Zn + CO₂
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
4. 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 involved in the gravimetric method of corrosion analysis
   3. the mass is measured before and after immersing it in NaOH;
   4. was degreased in sodium hydroxide solution;
   
   
5. In studied corrosion processes:
   1. a gas is released at both corrosion of zinc and aluminum;
   2. always the metal changes its oxidation state;
   3. the metal it changes its oxidation state becoming an anion;
   4. a gas is released only the corrosion of zinc;
   
   

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

1. Coroziunea metalelor:
   1. este protectia de durata impotriva agentilor chimici;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. poate fi redusa prin pasivare;
   4. poate fi redusa prin galvanizare;
   5. este distrugerea metalelor sub actiunea factorilor externi;
   
   
2. Pentru placa de zinc:
   1. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   2. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   3. a fost implicata īn metoda volumetrica de analiza a coroziunii
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   5. a fost corodata īn solutie sulfuric;
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Ni(CO)₄ -> Ni + CO
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. ZnO + CO -> Zn + CO₂
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
4. Pentru placa de aluminiu:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. masa este masurata īnainte si dupa imersia īn NaOH;
   4. a fost degresata īn solutie de hidroxid de sodiu;
   5. a fost corodata īn solutie de hidroxid de sodiu;
   
   
5. Īn procesele de coroziune studiate:
   1. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   2. īntotdeauna metalul isi schimba starea de oxidare;
   3. metalul isi schimba starea de oxidare pentru a deveni un anion;
   4. un gaz este eliberat numai la corodarea zincului;
   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. In studied corrosion processes:
   1. a gas is released only the corrosion of zinc;
   2. the metal it changes its oxidation state becoming an cation;
   3. always the metal changes its oxidation state;
   4. when a gas is released its volume depends on the amount of metal corroded;
   
   
2. The aluminum plate:
   1. was corroded in sodium hydroxide solution;
   2. the volume is measured before and after immersing it in NaOH;
   3. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. the mass is measured before and after immersing it in NaOH;
   
   
3. The zinc plate:
   1. was degreased in sulfuric acid solution;
   2. was corroded in sulfuric solution;
   3. was involved in the gravimetric method of corrosion analysis
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Fe -> H₂ + Fe²⁺
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. ZnO + CO -> Zn + CO₂
   
   
5. Corrosion of metals:
   1. may provide useful raw materials for analysis;
   2. can be reduced by passivation;
   3. is the destruction of metals under the action of external factors;
   4. is the protection in time to chemical agents;
   
   

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

1. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea zincului;
   2. metalul isi schimba starea de oxidare pentru a deveni un cation;
   3. īntotdeauna metalul isi schimba starea de oxidare;
   4. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   5. un gaz este eliberat numai la corodarea aluminiului;
   
   
2. Pentru placa de aluminiu:
   1. a fost corodata īn solutie de hidroxid de sodiu;
   2. volumul se masoara īnainte si dupa imersia īn NaOH;
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. masa este masurata īnainte si dupa imersia īn NaOH;
   
   
3. Pentru placa de zinc:
   1. a fost degresata īn solutie de acid sulfuric;
   2. a fost corodata īn solutie sulfuric;
   3. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Fe -> H₂ + Fe²⁺
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. ZnO + CO -> Zn + CO₂
   5. Al₂O₃ + NaOH -> NaAlO₂
   
   
5. Coroziunea metalelor:
   1. poate furniza materii prime utile pentru analiza;
   2. poate fi redusa prin pasivare;
   3. este distrugerea metalelor sub actiunea factorilor externi;
   4. este protectia de durata impotriva agentilor chimici;
   
   

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

1. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Fe -> H₂ + Fe²⁺
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. ZnO + CO -> Zn + CO₂
   
   
2. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. the metal it changes its oxidation state becoming an anion;
   3. a gas is released only the corrosion of aluminum;
   4. a gas is released at both corrosion of zinc and aluminum;
   
   
3. The zinc plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. was corroded in sulfuric solution;
   3. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. the surface is measured before and after immersing it in H₂SO₄;
   
   
4. The aluminum plate:
   1. the surface is measured before and after immersing it in NaOH;
   2. was involved in the volumetric method of corrosion analysis
   3. was degreased in sodium hydroxide solution;
   4. the mass is measured before and after immersing it in NaOH;
   
   
5. Corrosion of metals:
   1. can be reduced by passivation;
   2. takes place merely from exposure to moisture in air;
   3. may provide useful raw materials for analysis;
   4. is helping in the process of cleaning the metals surfaces;
   
   

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

1. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Fe -> H₂ + Fe²⁺
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. ZnO + CO -> Zn + CO₂
   
   
2. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. metalul isi schimba starea de oxidare pentru a deveni un anion;
   3. un gaz este eliberat numai la corodarea aluminiului;
   4. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   
   
3. Pentru placa de zinc:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. a fost corodata īn solutie sulfuric;
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   5. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   
   
4. Pentru placa de aluminiu:
   1. suprafata se masoara īnainte si dupa imersia īn NaOH;
   2. a fost implicata īn metoda volumetrica de analiza a coroziunii
   3. a fost degresata īn solutie de hidroxid de sodiu;
   4. masa este masurata īnainte si dupa imersia īn NaOH;
   
   
5. Coroziunea metalelor:
   1. poate fi redusa prin pasivare;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. poate furniza materii prime utile pentru analiza;
   4. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   5. este un proces benefic care arata stabilitatea metalelor;
   
   

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. when a gas is released its volume depends on the amount of metal corroded;
   3. the metal it changes its oxidation state becoming an anion;
   4. a gas is released at both corrosion of zinc and aluminum;
   
   
2. The zinc plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. was degreased in sulfuric acid solution;
   3. the mass is measured before and after immersing it in H₂SO₄;
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   
3. Which of the following reactions may be called as of corrosion:
   1. ZnO + CO -> Zn + CO₂
   2. H⁺ + Zn -> H₂ + Zn²⁺
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. Ni(CO)₄ -> Ni + CO
   
   
4. Corrosion of metals:
   1. may provide useful raw materials for analysis;
   2. is the destruction of metals under the action of external factors;
   3. can be reduced by passivation;
   4. is the protection in time to chemical agents;
   
   
5. The aluminum plate:
   1. was degreased in sodium hydroxide solution;
   2. the mass is measured before and after immersing it in NaOH;
   3. was involved in the gravimetric method of corrosion analysis
   4. was corroded in sodium hydroxide solution;
   
   

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. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   3. metalul isi schimba starea de oxidare pentru a deveni un anion;
   4. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   5. īntotdeauna metalul isi schimba starea de oxidare;
   
   
2. Pentru placa de zinc:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. a fost degresata īn solutie de acid sulfuric;
   3. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + CO -> Zn + CO₂
   2. H⁺ + Zn -> H₂ + Zn²⁺
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. Ni(CO)₄ -> Ni + CO
   
   
4. Coroziunea metalelor:
   1. poate furniza materii prime utile pentru analiza;
   2. este distrugerea metalelor sub actiunea factorilor externi;
   3. poate fi redusa prin pasivare;
   4. este protectia de durata impotriva agentilor chimici;
   5. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   
   
5. Pentru placa de aluminiu:
   1. a fost degresata īn solutie de hidroxid de sodiu;
   2. masa este masurata īnainte si dupa imersia īn NaOH;
   3. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. a fost corodata īn solutie de hidroxid de sodiu;
   5. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Intensitatea curentului:
   1. trebuie sa fie ajustata cand se incepe experimentul;
   2. afecteaza numai cantitatea de nichel depus;
   3. ar trebui sa fie ajustata de catre tehnicieni, nu avem nimic de a face acolo;
   4. trebuie sa fie calculata īnainte de a īncepe experimentul;
   
   
2. 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. legea solutilor;
   
   
3. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este relativ mica;
   2. depinde de intensitatea curentului utilizat;
   3. depinde de potentialul sursei utilizate;
   4. este redusa prin adaosuri de saruri;
   
   
4. Este de asteptat ca masa de nichel depus sa fie:
   1. mai mica decāt cea teoretica calculata;
   2. invers proportionala cu intensitatea curentului utilizat;
   3. proportionala cu intensitatea curentului utilizat;
   4. mult mai mica decāt cea teoretica calculata;
   
   
5. La nichelare urmatoarele reactii au avut loc:
   1. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   2. la anod (+), īn 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 densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la anod: O^2- - 2e^- -> O₂⁰
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Intensitatea curentului:
   1. trebuie sa fie calculata īnainte de a īncepe experimentul;
   2. ar trebui sa fie ajustata de catre tehnicieni, nu avem nimic de a face acolo;
   3. depinde de suprafata probei;
   4. se calculeaza dupa efectuarea experimentului;
   
   
2. Este de asteptat ca masa de nichel depus sa fie:
   1. proportionala cu timpul de nichelare;
   2. mult mai mare decāt cea teoretica calculata;
   3. invers proportional cu timpul de nichelare;
   4. proportionala cu suprafata probei;
   
   
3. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este relativ mare;
   2. este īmbunatatita prin adaosuri de saruri;
   3. este redusa prin adaosuri de saruri;
   4. depinde de potentialul sursei utilizate;
   5. este relativ mica;
   
   
4. La nichelare urmatoarele reactii au avut loc:
   1. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la 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 densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   5. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   
   
5. 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;