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. presence of the chlorine;
   2. formation of ammonium chloride;
   3. presence of the ammonia;
   4. our experiment designed to trap the product of the reaction;
   
   
2. The chronometer is used in the experiment for:
   1. indication of the moment when we should pay attention to the experiment;
   2. synchronization of the diffusion times;
   3. measuring of the diffusion time;
   4. extracting the information necessary to calculate the speeds ratio;
   
   
3. The position of the ring in the experiment is dependent on:
   1. the propagation of the species as ions and not as neutral molecules;
   2. the length of the tube and not of the width of the tube;
   3. the real speeds and not the virtual speeds of each involved species;
   4. the propagation of the species as neutral molecules and not as ions;
   
   
4. We may say the followings:
   1. the molecules have speeds only in gaseous state;
   2. the kinetic energy of a molecule is affected by temperature and pressure;
   3. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   4. diffusion process appears in all gaseous, liquid and solid states;
   
   
5. At the ends of the tube following equilibrium reactions occurs:
   1. H₂O \=\ H⁺ + HO^-
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. H⁺ + HO^- \=\ H₂O
   4. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   
   

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

1. Ceata observata īn timpul experimentului se datoreaza:
   1. prezentei clorului;
   2. formarea clorurii de amoniu;
   3. prezentei amoniacului;
   4. experimentului nostru proiectat pentru a captura produsul de reactie;
   
   
2. Cronometrul este utilizat īn experimentul pentru:
   1. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   2. sincronizarea timpilor de difuzie;
   3. masurarea timpului de difuzie;
   4. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   
   
3. Pozitia inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca ionii si nu ca si molecule neutre;
   2. lungimea tubului si nu latimea tubului;
   3. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   4. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   
   
4. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au viteze numai īn stare gazoasa;
   2. energia cinetica a unei molecule este afectata de temperatura si presiune;
   3. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   4. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   5. moleculele au viteze numai īn stare gazoasa si lichida;
   
   
5. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H₂O \=\ H⁺ + HO^-
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. H⁺ + HO^- \=\ H₂O
   4. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   
   

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 speeds ratio;
   2. extracting the information necessary to calculate the diffusion coefficients;
   3. measuring of the diffusion time;
   4. to keep us busy;
   
   
2. The fog observed during the experiment is due to:
   1. presence of the ammonia;
   2. presence of the chlorine;
   3. our experiment designed to trap the product of the reaction;
   4. formation of ammonium chloride;
   
   
3. We may say the followings:
   1. diffusion process appears only in gaseous and liquid states;
   2. the molecules have speeds only in gaseous state;
   3. the kinetic energy of a molecule is affected by temperature only;
   4. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   
   
4. 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 width of the tube and not of the length of the tube;
   3. the speed of diffusion of each involved species;
   4. the average energy or average speed of each involved species;
   
   
5. At the ends of the tube following equilibrium reactions occurs:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + HCl \=\ NH₄Cl
   4. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   
   

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 calcularea raportului vitezelor;
   2. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   3. masurarea timpului de difuzie;
   4. sa ne tina ocupati;
   5. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   
   
2. Ceata observata īn timpul experimentului se datoreaza:
   1. prezentei amoniacului;
   2. prezentei clorului;
   3. experimentului nostru proiectat pentru a captura produsul de reactie;
   4. formarea clorurii de amoniu;
   5. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   
   
3. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. proces de difuzie apare numai īn stare gazoasa si lichida;
   2. moleculele au viteze numai īn stare gazoasa;
   3. energia cinetica a unei molecule este afectata de numai temperatura;
   4. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   5. moleculele au viteze numai īn stare gazoasa si lichida;
   
   
4. Pozitia inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   2. latimea tubului si nu lungimea tubului;
   3. viteza de difuzie a fiecarei specii implicate;
   4. energia medie sau viteza medie a fiecarei specii implicate;
   5. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   
   
5. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + HCl \=\ NH₄Cl
   4. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   5. H₂O \=\ H⁺ + HO^-
   
   

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 propagation of the species as ions and not as neutral molecules;
   2. the concentrations of the solutions used;
   3. the speed of diffusion of each involved species;
   4. the average energy or average speed of each involved species;
   
   
2. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory or our breathing;
   2. our experiment designed to trap the product of the reaction;
   3. unproper illumination in the laboratory and our breathing;
   4. formation of ammonium chloride;
   
   
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 speeds;
   2. all have same speed;
   3. all are moving in the same direction;
   4. all have same energy;
   
   
4. We may say the followings:
   1. the molecules have energy in all gaseous, liquid and solid states;
   2. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   3. diffusion process appears in all gaseous, liquid and solid states;
   4. the kinetic energy of a molecule is affected by temperature and pressure;
   
   
5. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + HCl \=\ NH₄Cl
   2. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   3. H₂O \=\ H⁺ + HO^-
   4. H⁺ + HO^- \=\ H₂O
   
   

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. propagarea speciilor ca ionii si nu ca si molecule neutre;
   2. concentratiile solutiilor utilizate;
   3. viteza de difuzie a fiecarei specii implicate;
   4. energia medie sau viteza medie a fiecarei specii implicate;
   
   
2. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   2. experimentului nostru proiectat pentru a captura produsul de reactie;
   3. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   4. formarea clorurii de amoniu;
   
   
3. 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 viteza;
   3. toate se deplaseaza īn aceeasi directie;
   4. toate au aceeasi energie;
   5. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   
   
4. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au energie īn toate starile gazoasa, lichida si solida;
   2. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   3. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   4. energia cinetica a unei molecule este afectata de temperatura si presiune;
   5. moleculele au energie numai īn stare gazoasa;
   
   
5. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₃ + HCl \=\ NH₄Cl
   2. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   3. H₂O \=\ H⁺ + HO^-
   4. H⁺ + HO^- \=\ H₂O
   5. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   

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

1. The fog observed during the experiment is due to:
   1. formation of ammonium chloride;
   2. our experiment designed to trap the product of the reaction;
   3. unproper illumination in the laboratory or our breathing;
   4. presence of the ammonia;
   
   
2. The time to the formation of the ring in the experiment is dependent on:
   1. the mode energy or mode speed of each involved species;
   2. the propagation of the species as neutral molecules and not as ions;
   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;
   
   
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 speeds;
   2. all are moving in the same direction;
   3. all are moving in an arbitrary direction;
   4. all have same energy;
   
   
4. The chronometer is used in the experiment for:
   1. measuring of the diffusion time;
   2. synchronization of the diffusion times;
   3. extracting the information necessary to calculate the speeds ratio;
   4. extracting the information necessary to calculate the diffusion coefficients;
   
   
5. The position of the ring in the experiment is dependent on:
   1. the mode energy or mode speed of each involved species;
   2. the width of the tube and not of the length of the tube;
   3. the propagation of the species as neutral molecules and not as ions;
   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. formarea clorurii de amoniu;
   2. experimentului nostru proiectat pentru a captura produsul de reactie;
   3. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   4. prezentei amoniacului;
   
   
2. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. viteza la moda sau energia la moda a fiecarei specii implicate;
   2. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   3. latimea tubului si nu lungimea tubului;
   4. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   
   
3. 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 se deplaseaza īn aceeasi directie;
   3. toate se īndreapta īntr-o directie arbitrara;
   4. toate au aceeasi energie;
   
   
4. Cronometrul este utilizat īn experimentul pentru:
   1. masurarea timpului de difuzie;
   2. sincronizarea timpilor de difuzie;
   3. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   4. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   5. sa ne tina ocupati;
   
   
5. Pozitia inelului īn experimentul este dependenta de:
   1. viteza la moda sau energia la moda a fiecarei specii implicate;
   2. latimea tubului si nu lungimea tubului;
   3. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   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. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all have same energy;
   2. are considered to be at the same temperature, but may have different energies;
   3. all are moving in the same direction;
   4. are considered to be at the same temperature, but may have different speeds;
   
   
2. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory or our breathing;
   2. presence of the ammonia;
   3. formation of ammonium chloride;
   4. unproper illumination in the laboratory and our breathing;
   
   
3. The chronometer is used in the experiment for:
   1. measuring of the diffusion time;
   2. indication of the moment when we should pay attention to the experiment;
   3. to keep us busy;
   4. extracting the information necessary to calculate the diffusion coefficients;
   
   
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 length of the tube and the width of the tube;
   3. the mode energy or mode speed of each involved species;
   4. the length of the tube and not of the width of the tube;
   
   
5. 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 length of the tube and the width of the tube;
   3. the average energy or average speed of each involved species;
   4. the speed of diffusion of each involved species;
   
   

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

1. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate au aceeasi energie;
   2. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   3. toate se deplaseaza īn aceeasi directie;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   
   
2. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   2. prezentei amoniacului;
   3. formarea clorurii de amoniu;
   4. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   5. prezentei clorului;
   
   
3. Cronometrul este utilizat īn experimentul pentru:
   1. masurarea timpului de difuzie;
   2. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   3. sa ne tina ocupati;
   4. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   5. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   
   
4. Pozitia inelului īn experimentul este dependenta de:
   1. latimea tubului si nu lungimea tubului;
   2. lungimea tubului si latimea tubului;
   3. viteza la moda sau energia la moda a fiecarei specii implicate;
   4. lungimea tubului si nu latimea tubului;
   
   
5. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca ionii si nu ca si molecule neutre;
   2. lungimea tubului si latimea tubului;
   3. energia medie sau viteza medie a fiecarei specii implicate;
   4. viteza de difuzie a fiecarei specii implicate;
   
   

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

1. In the laboratory were studied:
   1. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   2. the producing of some gas as result of a lost of the mass of a solid;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   4. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   
   
2. For gaseous state:
   1. it exists an equation for all, p · V = n · R · T;
   2. the pressure is unchanged when a chemical reaction occurs;
   3. the pressure is approximately the same as in liquid state;
   4. the pressure is much higher than in liquid state;
   
   
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 derived to approximate the relation between state parameters;
   3. a relation which may involve some constants dependent of gas composition;
   4. usable in the laboratory, but is not to be used somewhere else;
   
   
4. 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. KNO₃ -> KNO₂ + O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
5. The values taken from the experiment conducted in the laboratory indicated that:
   1. we do not possess enough information to decide what gas was released from the reaction;
   2. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   3. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   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. Īn laborator s-au studiat:
   1. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   2. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   
   
2. Pentru stare gazoasa:
   1. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   2. presiunea este neschimbata cānd apare o reactie chimica;
   3. presiunea este aproximativ aceeasi ca si īn stare lichida;
   4. presiunea este mult mai mare decāt īn stare lichida;
   5. presiunea este mult mai mica decāt īn stare lichida;
   
   
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 derivata pentru a aproxima relatia dintre parametrii de stare;
   3. o relatie care poate implica unele constante dependente de compozitia gazului;
   4. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   5. o relatie obtinut dupa efectuarea experimentului;
   
   
4. 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. KNO₃ -> KNO₂ + O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
5. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   2. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   3. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   5. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   
   

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

1. The values taken from the experiment conducted in the laboratory indicated that:
   1. we possess enough information to decide what gas was released from the reaction;
   2. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   3. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   4. the ideal model of a gas approximated the worst the behavior of the released gas;
   
   
2. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. H₂O + O₂ -> H₂O₂;
   2. H₂O₂ -> H₂O + O₂;
   3. Ag₂O -> Ag + O₂;
   4. KCl + O₂ -> KClO₃;
   
   
3. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   2. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   3. the lost of the mass of a solid as result of producing of some gas;
   4. increasing of the temperature of a solid mass when was heated;
   
   
4. A state equation for a real gas is:
   1. usable in the laboratory, but is not to be used somewhere else;
   2. a relation between an unlimited number of state parameters;
   3. a relation between an certain number of state parameters;
   4. a relation which takes into account certain deviations from the ideal model;
   
   
5. For gaseous state:
   1. the pressure is subject to change when a chemical reaction occurs;
   2. the pressure is much higher than in liquid state;
   3. the pressure depends on the model which are used to approximate it;
   4. the pressure is exactly the same as in liquid state;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   2. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   3. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. H₂O + O₂ -> H₂O₂;
   2. H₂O₂ -> H₂O + O₂;
   3. Ag₂O -> Ag + O₂;
   4. KCl + O₂ -> KClO₃;
   
   
3. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   2. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   3. pierdut din masa de solid ca urmare a producerii unor gaze;
   4. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   5. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   2. o relatie īntre un numar nelimitat de parametri de stare;
   3. o relatie īntre un anumit numar de parametri de stare;
   4. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   5. o relatie obtinut dupa efectuarea experimentului;
   
   
5. Pentru stare gazoasa:
   1. presiunea se pot modifica atunci cānd apare o reactie chimica;
   2. presiunea este mult mai mare decāt īn stare lichida;
   3. presiunea depinde de modelul care este utilizat pentru o aproxima;
   4. presiunea este exact la fel ca si īn stare lichida;
   5. presiunea este aproximativ aceeasi ca si īn stare lichida;
   
   

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

1. A state equation for a real gas is:
   1. a relation which may involve some constants dependent of gas composition;
   2. usable in the laboratory, but is not to be used somewhere else;
   3. a relation which takes into account certain deviations from the ideal model;
   4. a relation between an unlimited number of state parameters;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. we do not possess enough information to decide what gas was released from the reaction;
   2. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   3. the ideal model of a gas approximated the best the behavior of the released gas;
   4. the ideal model of a gas approximated the worst the behavior of the released gas;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. distillation of the liquid air;
   2. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   3. KCl + O₂ -> KClO₃;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
4. In the laboratory were studied:
   1. increasing of the temperature of a solid mass when was heated;
   2. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   3. the lost of the mass of a solid as result of producing of some gas;
   4. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   
   
5. For gaseous state:
   1. it exists an equation for all, p · V = n · R · T;
   2. we need to take supplementary precautions in the laboratory;
   3. the pressure is much higher than in liquid state;
   4. the pressure depends on the model which are used to approximate it;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. o relatie care poate implica unele constante dependente de compozitia gazului;
   2. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   3. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   4. o relatie īntre un numar nelimitat de parametri de stare;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   2. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   3. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   4. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. distilarea aerului lichid;
   2. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   3. KCl + O₂ -> KClO₃;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
4. Īn laborator s-au studiat:
   1. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   3. pierdut din masa de solid ca urmare a producerii unor gaze;
   4. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   
   
5. Pentru stare gazoasa:
   1. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   2. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   3. presiunea este mult mai mare decāt īn stare lichida;
   4. presiunea depinde de modelul care este utilizat pentru o aproxima;
   
   

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. air were released as result of the decomposition;
   2. the ideal model of a gas approximated the best the behavior of the released gas;
   3. oxigen 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. A state equation for a real gas is:
   1. a relation which may involve some constants dependent of gas composition;
   2. usable in the laboratory, but is not to be used somewhere else;
   3. a relation which is always true, independent of the values of the state parameters;
   4. a relation which takes into account certain deviations from the ideal model;
   
   
3. For gaseous state:
   1. we need to take supplementary precautions in the laboratory;
   2. the pressure is much lower than in liquid state;
   3. it exists an equation for all, p · V = n · R · T;
   4. the pressure is subject to change when a chemical reaction occurs;
   
   
4. In the laboratory were studied:
   1. increasing of the pressure of a gas when was heated;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   3. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   4. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   
   
5. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KCl + O₂ -> KClO₃;
   2. opening a bubble water bottle;
   3. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   4. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. aer a fost eliberat ca urmare a descompunerii;
   2. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   3. oxigenul 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. O ecuatie de stare pentru un gaz real este:
   1. o relatie care poate implica unele constante dependente de compozitia gazului;
   2. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   3. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   4. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   
   
3. Pentru stare gazoasa:
   1. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   2. presiunea este mult mai mica decāt īn stare lichida;
   3. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   4. presiunea se pot modifica atunci cānd apare o reactie chimica;
   
   
4. Īn laborator s-au studiat:
   1. cresterea presiunii unui gaz cānd s-a īncalzit;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   3. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   5. pierdut din masa de solid ca urmare a producerii unor gaze;
   
   
5. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KCl + O₂ -> KClO₃;
   2. deschiderea unei sticle de apa cu bule;
   3. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   4. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   5. H₂O₂ -> H₂O + O₂;
   
   

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

1. For gaseous state:
   1. it exists an equation for all, p · V = n · R · T;
   2. the pressure is much higher than in liquid state;
   3. the pressure is subject to change when a chemical reaction occurs;
   4. we need to take supplementary precautions in the laboratory;
   
   
2. In the laboratory were studied:
   1. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   2. the producing of some gas as result of a lost of the mass of a solid;
   3. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   4. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KNO₃ -> KNO₂ + O₂;
   2. KCl + O₂ -> KClO₃;
   3. KClO₃ -> KCl + O₂;
   4. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   
   
4. The values taken from the experiment conducted in the laboratory indicated that:
   1. ozone were released as result of the decomposition;
   2. we possess enough information to decide what gas was released from the reaction;
   3. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   4. we do not possess enough information to decide what gas was released from the reaction;
   
   
5. A state equation for a real gas is:
   1. a relation which may involve some constants dependent of gas composition;
   2. usable in the laboratory, but is not to be used somewhere else;
   3. a relation which takes into account certain deviations from the ideal model;
   4. a relation between an certain number of state parameters;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pentru stare gazoasa:
   1. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   2. presiunea este mult mai mare decāt īn stare lichida;
   3. presiunea se pot modifica atunci cānd apare o reactie chimica;
   4. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   
   
2. Īn laborator s-au studiat:
   1. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   2. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   3. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KNO₃ -> KNO₂ + O₂;
   2. KCl + O₂ -> KClO₃;
   3. KClO₃ -> KCl + O₂;
   4. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   
   
4. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. ozonul au fost eliberat ca urmare a descompunerii;
   2. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   5. oxigenul au fost eliberat ca urmare a descompunerii;
   
   
5. O ecuatie de stare pentru un gaz real este:
   1. o relatie care poate implica unele constante dependente de compozitia gazului;
   2. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   3. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   4. o relatie īntre un anumit numar de parametri de stare;
   5. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The paper requires before analysis of the sample:
   1. to be dry;
   2. to be weighted;
   3. to be cut in small pieces;
   4. to measure its surface;
   
   
2. When aluminum is identified:
   1. the presence of other ions may produce a true negative outcome;
   2. there are many identification reactions possible;
   3. is identified as Al²⁺ cation;
   4. the presence of other ions may produce a false positive outcome;
   
   
3. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   
4. When lead is identified:
   1. a yellow complex appears;
   2. a blue complex appears;
   3. interference of other ions may affect the outcome;
   4. a heat release is observed;
   
   
5. Why moisten the paper with solution of sodium nitrate?
   1. to accomodate ourselves to use chemicals;
   2. to be cut easily with scissors;
   3. to provide cations for analysis;
   4. to have something to do in the laboratory;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Hartia necesita ca īnainte de analiza probei:
   1. sa fie uscata;
   2. sa fie cantarita;
   3. sa fie taiata īn bucati mici;
   4. sa i se masoare suprafata;
   
   
2. Cānd aluminiu este identificat:
   1. prezenta altor ioni poate produce un rezultat adevarat negativ;
   2. exista multe reactii posibile de identificare;
   3. este identificat ca cationul Al²⁺;
   4. prezenta altor ioni poate produce un rezultat fals pozitiv;
   5. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   
   
3. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   
4. Cānd plumbul este identificat:
   1. apare un complex galben;
   2. apare un complex albastru;
   3. interferenta altor ioni poate afecta rezultatul;
   4. se observa o eliberare de caldura;
   
   
5. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa ne acomodam in a utiliza substante chimice;
   2. sa fie taiat cu usurinta cu foarfeca;
   3. pentru furniza cationi pentru analiza;
   4. pentru a avea ceva de a face īn laborator;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The electric charges after passing the metals into solution may be:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   4. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   
2. 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. cations from the solution are passed into sample as metals;
   
   
3. The paper requires before analysis of the sample:
   1. to be tested;
   2. to be acidified;
   3. to measure its surface;
   4. to be moistened with an electrolyte;
   
   
4. Why moisten the paper with solution of sodium nitrate?
   1. for stopping after a while the chemical reaction that takes place;
   2. to provide cations for analysis;
   3. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   4. to accomodate ourselves to use chemicals;
   
   
5. This method of analysis of metals and alloys is:
   1. useful for alloys, not so useful for metals;
   2. a nondestructive method of analysis;
   3. a quantitative method of analysis;
   4. useful for both metals and alloys;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   4. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   5. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
2. 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. cationii din solutie sunt trecuti īn proba ca metale;
   
   
3. Hartia necesita ca īnainte de analiza probei:
   1. sa fie testata;
   2. sa fie acidulata;
   3. sa i se masoare suprafata;
   4. sa fie umezita cu un electrolit;
   
   
4. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru oprirea dupa un timp reactiei chimice care are loc;
   2. pentru furniza cationi pentru analiza;
   3. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   4. sa ne acomodam in a utiliza substante chimice;
   5. pentru a avea ceva de a face īn laborator;
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. utila pentru aliaje, nu atāt de utila pentru metale;
   2. o metoda nedistructiva de analiza;
   3. o metoda cantitativa de analiza;
   4. utila atāt pentru metale si aliaje;
   5. prea veche pentru a fi utilizata īn prezent īn laborator;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When lead is identified:
   1. precautions should be made for toxic wastes disposal;
   2. a yellow complex appears;
   3. the reactions used clearly indicates its presence;
   4. a blue complex appears;
   
   
2. When aluminum is identified:
   1. only one identification reaction is possible;
   2. there are many identification reactions possible;
   3. using of alizarin along with ammonium hidroxide provide a more selective indication about the presence of aluminum;
   4. the presence of other ions may produce a true positive outcome;
   
   
3. Why moisten the paper with solution of sodium nitrate?
   1. to provide cations for analysis;
   2. for stopping after a while the chemical reaction that takes place;
   3. for the paper to work as isolator;
   4. to be cut easily with scissors;
   
   
4. When the electrical circuit is closed:
   1. water dissociation is inhibited;
   2. electric current passes the sample and the paper;
   3. elements from the solution are passed into sample as metals;
   4. elements from the metals are passed into solution as cations;
   
   
5. The electric charges after passing the metals into solution may be:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd plumbul este identificat:
   1. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   2. apare un complex galben;
   3. reactiile utilizate īn mod clar ii indica prezenta;
   4. apare un complex albastru;
   5. sunt utilizate substante periculoase;
   
   
2. Cānd aluminiu este identificat:
   1. doar o reactie de identificare este posibila;
   2. exista multe reactii posibile de identificare;
   3. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un indiciu mai selectiv cu privire la prezenta aluminiului;
   4. prezenta altor ioni poate produce un rezultat adevarat pozitiv;
   
   
3. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru furniza cationi pentru analiza;
   2. pentru oprirea dupa un timp reactiei chimice care are loc;
   3. pentru ca hartia sa actioneze ca izolator;
   4. sa fie taiat cu usurinta cu foarfeca;
   
   
4. Cānd circuitul electric este īnchis:
   1. disocierea apei este inhibata;
   2. curent electric trece prin proba si hārtie;
   3. elemente din solutie sunt trecute īn proba ca metale;
   4. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   5. anionii din solutie sunt trecuti īn proba ca metale;
   
   
5. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   5. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When lead is identified:
   1. a red-brown complex appears;
   2. a yellow complex appears;
   3. a heat release is observed;
   4. a violet complex appears;
   
   
2. When the electrical circuit is closed:
   1. surface of the sample is fastly covered by a protecting shield of electrons;
   2. anions from the solution are passed into sample as metals;
   3. elements from the metals are passed into solution as anions;
   4. cations from the solution are passed into sample as metals;
   
   
3. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
4. This method of analysis of metals and alloys is:
   1. useful for pure metals, not so useful for alloys;
   2. a destructive method of analysis;
   3. useful for both metals and alloys;
   4. a gravimetric method of analysis;
   
   
5. The paper requires before analysis of the sample:
   1. to be weighted;
   2. to be cut in small pieces;
   3. to be moistened with an electrolyte;
   4. to be tested;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd plumbul este identificat:
   1. apare un complex rosu-brun;
   2. apare un complex galben;
   3. se observa o eliberare de caldura;
   4. apare un complex violet;
   
   
2. Cānd circuitul electric este īnchis:
   1. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   2. anionii din solutie sunt trecuti īn proba ca metale;
   3. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   4. cationii din solutie sunt trecuti īn proba ca metale;
   
   
3. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   5. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
4. Aceasta metoda de analiza de metale si aliaje este:
   1. utila pentru metale pure, nu atāt de utila pentru aliaje;
   2. o metoda distructiva de analiza;
   3. utila atāt pentru metale si aliaje;
   4. o metoda gravimetrica de analiza;
   5. prea veche pentru a fi utilizata īn prezent īn laborator;
   
   
5. Hartia necesita ca īnainte de analiza probei:
   1. sa fie cantarita;
   2. sa fie taiata īn bucati mici;
   3. sa fie umezita cu un electrolit;
   4. sa fie testata;
   5. sa fie uscata;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. Why moisten the paper with solution of sodium nitrate?
   1. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   2. to be cut easily with scissors;
   3. for the paper to work as isolator;
   4. for stopping after a while the chemical reaction that takes place;
   
   
2. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   4. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
3. When lead is identified:
   1. a blue complex appears;
   2. dangerous substances are used;
   3. precautions should be made for toxic wastes disposal;
   4. a heat release is observed;
   
   
4. The paper requires before analysis of the sample:
   1. to be dry;
   2. to be tested;
   3. to measure its surface;
   4. to be acidified;
   
   
5. When the electrical circuit is closed:
   1. water dissociation is inhibited;
   2. electric current passes the sample and the paper;
   3. elements from the metals are passed into solution as anions;
   4. anions from the solution are passed into sample as metals;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   2. sa fie taiat cu usurinta cu foarfeca;
   3. pentru ca hartia sa actioneze ca izolator;
   4. pentru oprirea dupa un timp reactiei chimice care are loc;
   5. sa ne acomodam in a utiliza substante chimice;
   
   
2. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   4. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
3. Cānd plumbul este identificat:
   1. apare un complex albastru;
   2. sunt utilizate substante periculoase;
   3. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   4. se observa o eliberare de caldura;
   5. apare un complex rosu-brun;
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa fie uscata;
   2. sa fie testata;
   3. sa i se masoare suprafata;
   4. sa fie acidulata;
   
   
5. Cānd circuitul electric este īnchis:
   1. disocierea apei este inhibata;
   2. curent electric trece prin proba si hārtie;
   3. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   4. anionii din solutie sunt trecuti īn proba ca metale;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The equivalence point is:
   1. the point in which a reactive should be added in the reaction flask;
   2. something rarely encountered in chemistry;
   3. indicated when a color change is observed into the solution;
   4. the point in which a reactive is fully consumed in the reaction;
   
   
2. Titration as a laboratory operation involves:
   1. a mass measurement;
   2. a volume measurement;
   3. a salt solution;
   4. a sulphuric acid solution;
   
   
3. 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 number of atoms for each element;
   3. all glassware should be clean before and after conducting the experiment;
   4. the liquid in the burette should be at the same level before and after conducting the experiment;
   
   
4. The following chemical reactions were used in the experiments:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
5. Reactions between acids and bases:
   1. are all exothermic, being therefore dangerous outside of the laboratory;
   2. are rarely useful, and even rarely used;
   3. are always fast, taking place almost instantaneously;
   4. have as effect the change of the color of a solution;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Punctul de echivalenta este:
   1. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   2. ceva rar īntālnit īn chimie;
   3. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   4. punctul īn care un reactiv este consumat complet īn reactie;
   
   
2. Titrarea ca o operatiune de laborator implica:
   1. masurarea masei;
   2. masurarea volumului;
   3. o solutie de sare;
   4. o solutie de acid sulfuric;
   5. un pH-metru;
   
   
3. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii volumului;
   2. principiul conservarii numarul de atomi pentru fiecare element;
   3. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   4. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   
   
4. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
5. Reactiile īntre acizi si baze:
   1. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   2. sunt rareori utile, si chiar mai rar utilizate;
   3. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   4. au ca efect schimbarea culorii unei solutii;
   5. au drept consecinta dizolvarea unei sari;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The indicator should be added:
   1. in small quantities, to avoid the errors in observations and in calculations;
   2. to provide a color change at equivalence point;
   3. only in special cases, when the burette is graded from its bottom to its top;
   4. in large quantities, according to the principle 'only size matters';
   
   
2. Reactions between acids and bases:
   1. always have as a consequence the formation of a quantity of water;
   2. have as effect the change of the color of a solution;
   3. are rarely useful, and even rarely used;
   4. are always fast, taking place almost instantaneously;
   
   
3. The equivalence point is:
   1. used to balance the equation;
   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. 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. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
5. A redox process:
   1. involves a transfer of electrons from one atom or group of atoms to another;
   2. occurs only when we mix wrong substances in the laboratory;
   3. is always fast and safe;
   4. involves changing of the oxidation states of some participants to the reaction;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Trebuie adaugat indicatorul:
   1. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   2. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   3. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   4. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   
   
2. Reactiile īntre acizi si baze:
   1. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   2. au ca efect schimbarea culorii unei solutii;
   3. sunt rareori utile, si chiar mai rar utilizate;
   4. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   
   
3. Punctul de echivalenta este:
   1. folosit pentru a echilibra ecuatia;
   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. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   
   
4. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. H₂O + CO₂ -> H₂CO₃
   3. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   5. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
5. Un proces redox:
   1. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   2. apare numai atunci cānd se amesteca substante gresit īn laborator;
   3. este īntotdeauna rapid si sigur;
   4. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   5. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The density of the solutions depends on:
   1. quantity;
   2. concentration;
   3. temperature;
   4. pressure;
   
   
2. The following chemical reactions were used in the experiments:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   
3. The equivalence point is:
   1. the point in which a reactive is fully consumed in the reaction;
   2. something rarely encountered in chemistry;
   3. the point in which a reactive should be added in the reaction flask;
   4. used to balance the equation;
   
   
4. The indicator should be added:
   1. to indicate our safety limits when we dealt with chemicals;
   2. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   3. only at the suggestion of the supervisor;
   4. in small quantities, to avoid the errors in observations and in calculations;
   
   
5. Reactions between acids and bases:
   1. have as a consequence the dissolution of a salt;
   2. have as effect the change of the color of a solution;
   3. are always fast, taking place almost instantaneously;
   4. always have as a consequence the formation of a quantity of water;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Densitatea solutiilor depinde de:
   1. cantitate;
   2. concentratie;
   3. temperatura;
   4. presiune;
   
   
2. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   
3. Punctul de echivalenta este:
   1. punctul īn care un reactiv este consumat complet īn reactie;
   2. ceva rar īntālnit īn chimie;
   3. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   4. folosit pentru a echilibra ecuatia;
   
   
4. Trebuie adaugat indicatorul:
   1. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   2. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   3. numai la sugestia supraveghetorului;
   4. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   
   
5. Reactiile īntre acizi si baze:
   1. au drept consecinta dizolvarea unei sari;
   2. au ca efect schimbarea culorii unei solutii;
   3. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   4. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. In the calculations:
   1. are necessary to take some information from reagent bottles;
   2. are necessary to use some formulas expressing in different ways the concentration;
   3. are necessary to use our phones;
   4. are necessary to take the results imediatly after these are available from others;
   
   
2. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the energy;
   2. all glassware should be clean before and after conducting the experiment;
   3. the principle of the conservation of the volume;
   4. the principle of the conservation of the number of atoms for each element;
   
   
3. Reactions between acids and bases:
   1. are rarely useful, and even rarely used;
   2. are all exothermic, being therefore dangerous outside of the laboratory;
   3. are always fast, taking place almost instantaneously;
   4. have as effect the change of the color of a solution;
   
   
4. The equivalence point is:
   1. used to balance the equation;
   2. the point in which a reactive should be added in the reaction flask;
   3. the point in which a reactive should be added in the burette;
   4. the point in which a reactive is fully consumed in the reaction;
   
   
5. The indicator should be added:
   1. only in special cases, when the burette is graded from its bottom to its top;
   2. in large quantities, according to the principle 'only size matters';
   3. to indicate our safety limits when we dealt with chemicals;
   4. in small quantities, to avoid the errors in observations and in calculations;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. In calcule:
   1. este necesar a se lua unele informatii de pe sticlele de reactivi;
   2. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   3. este necesar sa utilizam telefoanele;
   4. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   
   
2. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii energiei;
   2. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   3. principiul conservarii volumului;
   4. principiul conservarii numarul de atomi pentru fiecare element;
   
   
3. Reactiile īntre acizi si baze:
   1. sunt rareori utile, si chiar mai rar utilizate;
   2. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   3. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   4. au ca efect schimbarea culorii unei solutii;
   5. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   
   
4. Punctul de echivalenta este:
   1. folosit pentru a echilibra ecuatia;
   2. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   3. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   4. punctul īn care un reactiv este consumat complet īn reactie;
   5. ceva rar īntālnit īn chimie;
   
   
5. Trebuie adaugat indicatorul:
   1. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   2. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   3. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   4. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Titration as a laboratory operation involves:
   1. a natrium hydroxide solution;
   2. a pH indicator that changes color depending on the pH of the solution;
   3. an mixing of two ore more solutions;
   4. a standard or referential reactive;
   
   
2. The density of the solutions depends on:
   1. pressure;
   2. time elapsed since were prepared;
   3. concentration;
   4. provider;
   
   
3. A redox process:
   1. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. occurs only when we mix wrong substances in the laboratory;
   3. involves changing of the oxidation states of some participants to the reaction;
   4. involves a transfer of electrons from one atom or group of atoms to another;
   
   
4. In the calculations:
   1. are necessary to take some information from reagent bottles;
   2. are necessary to use our phones;
   3. are necessary to draw the tables in our notebooks after completing of the experiment;
   4. are necessary to use some formulas expressing in different ways the concentration;
   
   
5. The following chemical reactions were used in the experiments:
   1. H₂O + CO₂ -> H₂CO₃
   2. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   3. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Titrarea ca o operatiune de laborator implica:
   1. o solutie de hidroxid de sodiu;
   2. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   3. amestecul a doua sau mai multe solutii;
   4. un standard sau reactiv de referinta;
   5. o biureta;
   
   
2. Densitatea solutiilor depinde de:
   1. presiune;
   2. timpul scurs de cand au fost pregatite;
   3. concentratie;
   4. furnizor;
   
   
3. Un proces redox:
   1. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. apare numai atunci cānd se amesteca substante gresit īn laborator;
   3. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   4. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   5. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   
   
4. In calcule:
   1. este necesar a se lua unele informatii de pe sticlele de reactivi;
   2. este necesar sa utilizam telefoanele;
   3. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   4. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   5. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   
   
5. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂O + CO₂ -> H₂CO₃
   2. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   3. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   5. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
2. In the laboratory the water were:
   1. acidified for drinking purposes;
   2. alkalinized for drinking purposes;
   3. softened using the resin column;
   4. biologically purified using the resin column;
   
   
3. 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 + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   4. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   
   
4. For a water sample following measures may be quantitatively expressed:
   1. mineral acidity;
   2. color;
   3. total alkalinity;
   4. purity;
   
   
5. EDTA is used:
   1. for complexing of Na¹⁺ and K¹⁺ ions;
   2. for complexing of Ca²⁺ and Mg²⁺ ions;
   3. as reagent for determining the hardness of the water;
   4. for recharging of the resin for water softening;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   5. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   
   
2. In laborator apa au fost:
   1. acidulata pentru baut;
   2. alcalinizeaza pentru baut;
   3. dedurizata folosind coloana de rasina;
   4. purificata biologic utilizānd coloana de rasina;
   5. complexata prin metoda titrimetrica EDTA;
   
   
3. 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 + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   4. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   5. HCl + HO⁺ -> H₂O + Cl⁺
   
   
4. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate minerala;
   2. culoare;
   3. alcalinitate totala;
   4. puritate;
   
   
5. EDTA este utilizat:
   1. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   2. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   3. ca reactiv pentru determinarea duritatii apei;
   4. pentru reīncarcarea rasinii la dedurizarea apei;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. In the laboratory were analyzed:
   1. the acidity of the water;
   2. the hardness of the water;
   3. the color of the water;
   4. the mass of the water;
   
   
2. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   2. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + CO₃^2- -> HCO₃^- + Cl^-
   
   
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 complexing of Ca²⁺ and Mg²⁺ ions;
   4. for safety precautions purposes;
   
   
4. In the laboratory the water were:
   1. biologically purified using the resin column;
   2. softened using the resin column;
   3. complexed by using EDTA titrimetric method;
   4. acidified for drinking purposes;
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. purity;
   2. color;
   3. mineral acidity;
   4. permanent alkalinity;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Īn laborator au fost analizate:
   1. aciditatea apei;
   2. duritatea apei;
   3. culoarea apei;
   4. masa apei;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   2. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + CO₃^2- -> HCO₃^- + Cl^-
   
   
3. EDTA este utilizat:
   1. ca reactiv pentru determinarea duritatii apei;
   2. pentru indicarea punctului de echilibru īn reactie;
   3. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   4. ca masura de siguranta;
   
   
4. In laborator apa au fost:
   1. purificata biologic utilizānd coloana de rasina;
   2. dedurizata folosind coloana de rasina;
   3. complexata prin metoda titrimetrica EDTA;
   4. acidulata pentru baut;
   5. calita folosind coloana de rasina;
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. puritate;
   2. culoare;
   3. aciditate minerala;
   4. alcalinitate permanenta;
   5. duritate;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. We may say the followings:
   1. natural water may contain organic matter and living organisms;
   2. water is pure only when is taken from a good freshwater mountain stream;
   3. water is a good polar solvent;
   4. purification of the water may include labeling processes;
   
   
2. In the laboratory the water were:
   1. complexed by using EDTA titrimetric method;
   2. biologically purified using the resin column;
   3. hardened using the resin column;
   4. softened using the resin column;
   
   
3. In the laboratory were analyzed:
   1. the concentration of the water;
   2. the acidity of the water;
   3. the alkalinity of the water;
   4. the color of the water;
   
   
4. For a water sample following measures may be quantitatively expressed:
   1. total alkalinity;
   2. total acidity;
   3. mineral acidity;
   4. purity;
   
   
5. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Putem spune urmatoarele:
   1. apa naturala poate contine materie organica si organisme vii;
   2. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   3. apa este un solvent polar bun;
   4. purificarea apei poate include procesele de etichetare;
   
   
2. In laborator apa au fost:
   1. complexata prin metoda titrimetrica EDTA;
   2. purificata biologic utilizānd coloana de rasina;
   3. calita folosind coloana de rasina;
   4. dedurizata folosind coloana de rasina;
   
   
3. Īn laborator au fost analizate:
   1. concentratia apei;
   2. aciditatea apei;
   3. alcalinitatea apei;
   4. culoarea apei;
   
   
4. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. alcalinitate totala;
   2. aciditate totala;
   3. aciditate minerala;
   4. puritate;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   5. HCl + HO^- -> H₂O + Cl^-
   
   

FINAL TEST AT LABORATORY
Water analysis

1. In the laboratory the water were:
   1. alkalinized for drinking purposes;
   2. biologically purified using the resin column;
   3. softened using the resin column;
   4. complexed by using EDTA titrimetric method;
   
   
2. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   2. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   3. HCl + HO^- -> H₂O + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   
3. EDTA is used:
   1. as reagent for determining the hardness of the water;
   2. for safety precautions purposes;
   3. for indication of the equilibrium point in the reaction;
   4. for complexing of Ca²⁺ and Mg²⁺ ions;
   
   
4. We may say the followings:
   1. purification of the water may include chemical processes;
   2. purification of the water may include biological processes;
   3. water is pure only when is taken from a good freshwater mountain stream;
   4. purification of the water may include physical processes;
   
   
5. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + NO₃^- -> NaNO₃ + HO^-
   2. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. In laborator apa au fost:
   1. alcalinizeaza pentru baut;
   2. purificata biologic utilizānd coloana de rasina;
   3. dedurizata folosind coloana de rasina;
   4. complexata prin metoda titrimetrica EDTA;
   5. calita folosind coloana de rasina;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   2. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   3. HCl + HO^- -> H₂O + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   
3. EDTA este utilizat:
   1. ca reactiv pentru determinarea duritatii apei;
   2. ca masura de siguranta;
   3. pentru indicarea punctului de echilibru īn reactie;
   4. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   
   
4. Putem spune urmatoarele:
   1. purificarea apei poate include procese chimice;
   2. purificarea apei poate include procese biologice;
   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;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + NO₃^- -> NaNO₃ + HO^-
   2. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. For a water sample following measures may be quantitatively expressed:
   1. color;
   2. purity;
   3. mineral acidity;
   4. hardness;
   
   
2. We may say the followings:
   1. natural water may contain organic matter and living organisms;
   2. purification of the water may include physical processes;
   3. water is pure only when is taken from a good freshwater mountain stream;
   4. when water contains dissolved minerals and gases is bad for drinking;
   
   
3. In the laboratory were analyzed:
   1. the softness of the water;
   2. the hardness of the water;
   3. the alkalinity of the water;
   4. the temperature of the water;
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + HCOO^- -> HCOONa + HO^-
   3. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   4. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   
5. EDTA is used:
   1. as reagent for determining the hardness of the water;
   2. for complexing of Na¹⁺ and K¹⁺ ions;
   3. for safety precautions purposes;
   4. for indication of the equilibrium point in the reaction;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. culoare;
   2. puritate;
   3. aciditate minerala;
   4. duritate;
   5. alcalinitate totala;
   
   
2. Putem spune urmatoarele:
   1. apa naturala poate contine materie organica si organisme vii;
   2. purificarea apei poate include procedee fizice;
   3. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   4. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   
   
3. Īn laborator au fost analizate:
   1. moliciunea apei;
   2. duritatea apei;
   3. alcalinitatea apei;
   4. temperatura apei;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + HCOO^- -> HCOONa + HO^-
   3. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   4. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   
5. EDTA este utilizat:
   1. ca reactiv pentru determinarea duritatii apei;
   2. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   3. ca masura de siguranta;
   4. pentru indicarea punctului de echilibru īn reactie;
   
   

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

1. The aluminum plate:
   1. was corroded in sodium hydroxide solution;
   2. was involved in the gravimetric method of corrosion analysis
   3. was involved in the volumetric 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;
   
   
2. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an anion;
   2. a gas is released only the corrosion of aluminum;
   3. always the metal changes its oxidation state;
   4. a gas is released only the corrosion of zinc;
   
   
3. Corrosion of metals:
   1. is the destruction of metals under the action of external factors;
   2. can be reduced by passivation;
   3. takes place merely from exposure to moisture in air;
   4. may provide useful raw materials for analysis;
   
   
4. The zinc plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. the surface is measured before and after immersing it in H₂SO₄;
   3. was degreased in sulfuric acid solution;
   4. the volume is measured before and after immersing it in H₂SO₄;
   
   
5. Which of the following reactions may be called as of corrosion:
   1. Al₂O₃ + NaOH -> NaAlO₂
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. Ni(CO)₄ -> Ni + CO
   
   

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

1. Pentru placa de aluminiu:
   1. a fost corodata īn solutie de hidroxid de sodiu;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. a fost implicata īn metoda volumetrica de analiza a coroziunii
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   
2. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un anion;
   2. un gaz este eliberat numai la corodarea aluminiului;
   3. īntotdeauna metalul isi schimba starea de oxidare;
   4. un gaz este eliberat numai la corodarea zincului;
   5. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   
   
3. Coroziunea metalelor:
   1. este distrugerea metalelor sub actiunea factorilor externi;
   2. poate fi redusa prin pasivare;
   3. are loc pur si simplu prin expunerea la umiditate īn aer;
   4. poate furniza materii prime utile pentru analiza;
   5. este un proces benefic care arata stabilitatea metalelor;
   
   
4. Pentru placa de zinc:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   3. a fost degresata īn solutie de acid sulfuric;
   4. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   5. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   
5. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Al₂O₃ + NaOH -> NaAlO₂
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. Ni(CO)₄ -> Ni + CO
   
   

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

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

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

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

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

1. The zinc plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. was corroded in sulfuric solution;
   3. the mass is measured before and after immersing it in H₂SO₄;
   4. was degreased in sulfuric acid solution;
   
   
2. Corrosion of metals:
   1. is a beneficial process that shows the stability of metals;
   2. can be reduced by passivation;
   3. takes place merely from exposure to moisture in air;
   4. is the destruction of metals under the action of external factors;
   
   
3. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. ZnO + CO -> Zn + CO₂
   
   
4. In studied corrosion processes:
   1. always the metal changes its oxidation state;
   2. a gas is released only the corrosion of aluminum;
   3. a gas is released only the corrosion of zinc;
   4. when a gas is released its volume depends on the amount of metal corroded;
   
   
5. The aluminum plate:
   1. the mass is measured before and after immersing it in NaOH;
   2. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   3. was involved in the volumetric method of corrosion analysis
   4. was degreased in sodium hydroxide solution;
   
   

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

1. Pentru placa de zinc:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. a fost corodata īn solutie sulfuric;
   3. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   4. a fost degresata īn solutie de acid sulfuric;
   
   
2. Coroziunea metalelor:
   1. este un proces benefic care arata stabilitatea metalelor;
   2. poate fi redusa prin pasivare;
   3. are loc pur si simplu prin expunerea la umiditate īn aer;
   4. este distrugerea metalelor sub actiunea factorilor externi;
   5. poate fi redusa prin galvanizare;
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. ZnO + CO -> Zn + CO₂
   
   
4. Īn procesele de coroziune studiate:
   1. īntotdeauna metalul isi schimba starea de oxidare;
   2. un gaz este eliberat numai la corodarea aluminiului;
   3. un gaz este eliberat numai la corodarea zincului;
   4. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   5. metalul isi schimba starea de oxidare pentru a deveni un anion;
   
   
5. Pentru placa de aluminiu:
   1. masa este masurata īnainte si dupa imersia īn NaOH;
   2. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   3. a fost implicata īn metoda volumetrica de analiza a coroziunii
   4. a fost degresata īn solutie de hidroxid de sodiu;
   5. volumul se masoara īnainte si dupa imersia īn NaOH;
   
   

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

1. 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 cation;
   4. a gas is released only the corrosion of aluminum;
   
   
2. The aluminum plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. the mass is measured before and after immersing it in NaOH;
   3. was involved in the volumetric method of corrosion analysis
   4. the surface is measured before and after immersing it in NaOH;
   
   
3. The zinc plate:
   1. was degreased in sulfuric acid solution;
   2. the surface is measured before and after immersing it in H₂SO₄;
   3. the mass is measured before and after immersing it in H₂SO₄;
   4. was involved in the volumetric method of corrosion analysis
   
   
4. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   
5. Corrosion of metals:
   1. is a beneficial process that shows the stability of metals;
   2. may provide useful raw materials for analysis;
   3. can be reduced by electroplating;
   4. takes place merely from exposure to moisture in air;
   
   

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

1. 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 cation;
   4. un gaz este eliberat numai la corodarea aluminiului;
   
   
2. Pentru placa de aluminiu:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. masa este masurata īnainte si dupa imersia īn NaOH;
   3. a fost implicata īn metoda volumetrica de analiza a coroziunii
   4. suprafata se masoara īnainte si dupa imersia īn NaOH;
   
   
3. Pentru placa de zinc:
   1. a fost degresata īn solutie de acid sulfuric;
   2. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   3. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. H⁺ + Fe -> H₂ + Fe²⁺
   5. Al₂O₃ + NaOH -> NaAlO₂
   
   
5. Coroziunea metalelor:
   1. este un proces benefic care arata stabilitatea metalelor;
   2. poate furniza materii prime utile pentru analiza;
   3. poate fi redusa prin galvanizare;
   4. are loc pur si simplu prin expunerea la umiditate īn aer;
   
   

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 + CO -> Zn + CO₂
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. Fe₂O₃ + CO -> Fe + CO₂
   
   
2. The aluminum plate:
   1. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   2. the volume is measured before and after immersing it in NaOH;
   3. was degreased in sodium hydroxide solution;
   4. the mass is measured before and after immersing it in NaOH;
   
   
3. The zinc plate:
   1. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   2. the mass is measured before and after immersing it in H₂SO₄;
   3. was involved in the gravimetric method of corrosion analysis
   4. the volume is measured before and after immersing it in H₂SO₄;
   
   
4. Corrosion of metals:
   1. is a beneficial process that shows the stability of metals;
   2. can be reduced by passivation;
   3. can be reduced by electroplating;
   4. is the destruction of metals under the action of external factors;
   
   
5. In studied corrosion processes:
   1. a gas is released only the corrosion of zinc;
   2. the metal it changes its oxidation state becoming an cation;
   3. a gas is released only the corrosion of aluminum;
   4. always the metal changes its oxidation state;
   
   

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 + CO -> Zn + CO₂
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. Fe₂O₃ + CO -> Fe + CO₂
   
   
2. Pentru placa de aluminiu:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. volumul se masoara īnainte si dupa imersia īn NaOH;
   3. a fost degresata īn solutie de hidroxid de sodiu;
   4. masa este masurata īnainte si dupa imersia īn NaOH;
   5. suprafata se masoara īnainte si dupa imersia īn NaOH;
   
   
3. Pentru placa de zinc:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   3. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   5. a fost corodata īn solutie sulfuric;
   
   
4. Coroziunea metalelor:
   1. este un proces benefic care arata stabilitatea metalelor;
   2. poate fi redusa prin pasivare;
   3. poate fi redusa prin galvanizare;
   4. este distrugerea metalelor sub actiunea factorilor externi;
   
   
5. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea zincului;
   2. metalul isi schimba starea de oxidare pentru a deveni un cation;
   3. un gaz este eliberat numai la corodarea aluminiului;
   4. īntotdeauna metalul isi schimba starea de oxidare;
   5. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. It is expected to have a mass of nickel deposited:
   1. inversely proportional with the intensity of the current used;
   2. proportional with the intensity of the current used;
   3. much higher than the calculated theoretical one;
   4. higher than the calculated theoretical one;
   
   
2. The intensity of the current:
   1. is to be calculated before to start the experiment;
   2. is to be adjusted when the experiment starts;
   3. affect only the quantity of the nickel deposition;
   4. is to be calculated after conducting the experiment;
   
   
3. Theoretical mass of nickel deposited is calculated using:
   1. the conservation of the number of atoms for each element law;
   2. perfect gas law;
   3. solutions laws;
   4. law of mass action;
   
   
4. Electrical conductivity of nickel salts solutions:
   1. is improved by salts additions;
   2. is relatively high;
   3. is relatively small;
   4. depends on the intensity of the current used;
   
   
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, Ni²⁺ + 2e^- -> Ni⁰
   3. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   4. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. Electrical conductivity of nickel salts solutions:
   1. is relatively small;
   2. is improved by salts additions;
   3. depends on the intensity of the current used;
   4. depends on the potential of the source used;
   
   
2. Theoretical mass of nickel deposited is calculated using:
   1. solutions laws;
   2. perfect gas law;
   3. the electrolysis law;
   4. the conservation of the energy law;
   
   
3. It is expected to have a mass of nickel deposited:
   1. proportional with the surface of the sample;
   2. much higher than the calculated theoretical one;
   3. inversely proportional with the nickel plating time;
   4. proportional with the intensity of the current used;
   
   
4. The intensity of the current:
   1. is to be calculated after conducting the experiment;
   2. does not affect the quality nor the quantity of the nickel deposition;
   3. affect only the quality of the nickel deposition;
   4. affect only the quantity of the nickel deposition;
   
   
5. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   2. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   3. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   4. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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