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

1. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + HCl \=\ NH₄Cl
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. H₂O \=\ H⁺ + HO^-
   4. H⁺ + HO^- \=\ H₂O
   
   
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 length of the tube and not of the width of the tube;
   3. the length of the tube and the width of the tube;
   4. the virtual speeds and not the real speeds of each involved species;
   
   
3. 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 real speeds and not the virtual speeds of each involved species;
   3. the propagation of the species as ions and not as neutral molecules;
   4. the average energy or average speed of each involved species;
   
   
4. 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. to keep us busy;
   4. synchronization of the diffusion times;
   
   
5. We may say the followings:
   1. the molecules have speeds only in gaseous state;
   2. diffusion process appears only in gaseous and liquid states;
   3. the molecules have energy only in gaseous and liquid states;
   4. the molecules have energy only in gaseous state;
   
   

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

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

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

1. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory and our breathing;
   2. unproper illumination in the laboratory or our breathing;
   3. presence of the ammonia;
   4. presence of the chlorine;
   
   
2. At the ends of the tube following equilibrium reactions occurs:
   1. H⁺ + HO^- \=\ H₂O
   2. H₂O \=\ H⁺ + HO^-
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. NH₃ + HCl \=\ NH₄Cl
   
   
3. The position of the ring in the experiment is dependent on:
   1. the concentrations of the solutions used;
   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 width of the tube and not of the length of the tube;
   
   
4. The chronometer is used in the experiment for:
   1. extracting the information necessary to calculate the speeds ratio;
   2. measuring of the diffusion time;
   3. to keep us busy;
   4. indication of the moment when we should pay attention to the experiment;
   
   
5. We may say the followings:
   1. the molecules have speeds only in gaseous state;
   2. diffusion process appears in all gaseous, liquid and solid states;
   3. the kinetic energy of a molecule is affected by temperature and pressure;
   4. the kinetic energy of a molecule is affected by temperature only;
   
   

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

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

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

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

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

1. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all are moving in the same direction;
   2. are considered to be at the same temperature, but may have different speeds;
   3. all are moving in an arbitrary direction;
   4. all have same energy;
   
   
2. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. H₂O \=\ H⁺ + HO^-
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the real speeds and not the virtual speeds of each involved species;
   2. the virtual speeds and not the real speeds of each involved species;
   3. the width of the tube and not of the length of the tube;
   4. the concentrations of the solutions used;
   
   
4. The chronometer is used in the experiment for:
   1. synchronization of the diffusion times;
   2. measuring of the diffusion time;
   3. extracting the information necessary to calculate the speeds ratio;
   4. to keep us busy;
   
   
5. We may say the followings:
   1. diffusion process appears 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. the molecules have energy in all gaseous, liquid and solid states;
   4. the molecules have energy only in gaseous state;
   
   

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

1. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate se deplaseaza īn aceeasi directie;
   2. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   3. toate se īndreapta īntr-o directie arbitrara;
   4. toate au aceeasi energie;
   5. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. H₂O \=\ H⁺ + HO^-
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   5. H⁺ + HO^- \=\ H₂O
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   2. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   3. latimea tubului si nu lungimea tubului;
   4. concentratiile solutiilor utilizate;
   
   
4. Cronometrul este utilizat īn experimentul pentru:
   1. sincronizarea timpilor de difuzie;
   2. masurarea timpului de difuzie;
   3. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   4. sa ne tina ocupati;
   5. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   
   
5. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   2. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   3. moleculele au energie īn toate starile gazoasa, lichida si solida;
   4. moleculele au energie numai īn stare gazoasa;
   5. proces de difuzie apare numai īn stare gazoasa;
   
   

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 ammonia;
   2. presence of the chlorine;
   3. our experiment designed to trap the product of the reaction;
   4. unproper illumination in the laboratory or our breathing;
   
   
2. We may say the followings:
   1. the molecules have energy only in gaseous state;
   2. diffusion process appears in all gaseous, liquid and solid states;
   3. the molecules have speeds in all gaseous, liquid and solid states;
   4. the molecules have speeds only in gaseous and liquid states;
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the length of the tube and not of the width of the tube;
   2. the mode energy or mode speed of each involved species;
   3. the real speeds and not the virtual speeds of each involved species;
   4. the concentrations of the solutions used;
   
   
4. The chronometer is used in the experiment for:
   1. extracting the information necessary to calculate the diffusion coefficients;
   2. to keep us busy;
   3. measuring of the diffusion time;
   4. indication of the moment when we should pay attention to the experiment;
   
   
5. At the ends of the tube following equilibrium reactions occurs:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. H⁺ + HO^- \=\ H₂O
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. NH₃ + HCl \=\ NH₄Cl
   
   

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

1. Ceata observata īn timpul experimentului se datoreaza:
   1. prezentei amoniacului;
   2. prezentei clorului;
   3. experimentului nostru proiectat pentru a captura produsul de reactie;
   4. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   5. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   
   
2. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au energie numai īn stare gazoasa;
   2. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   3. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   4. moleculele au viteze numai īn stare gazoasa si lichida;
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. lungimea tubului si nu latimea tubului;
   2. viteza la moda sau energia la moda a fiecarei specii implicate;
   3. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   4. concentratiile solutiilor utilizate;
   
   
4. Cronometrul este utilizat īn experimentul pentru:
   1. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   2. sa ne tina ocupati;
   3. masurarea timpului de difuzie;
   4. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   5. sincronizarea timpilor de difuzie;
   
   
5. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. H⁺ + HO^- \=\ H₂O
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. NH₃ + HCl \=\ NH₄Cl
   
   

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

1. For gaseous state:
   1. the pressure is unchanged when a chemical reaction occurs;
   2. the pressure is approximately the same as in liquid state;
   3. the pressure is much higher than in liquid state;
   4. the pressure is subject to change when a chemical reaction occurs;
   
   
2. A state equation for a real gas is:
   1. a relation derived to approximate the relation between state parameters;
   2. a relation between an certain number of state parameters;
   3. a relation which takes into account certain deviations from the ideal model;
   4. usable in the laboratory, but is not to be used somewhere else;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   2. opening a bubble water bottle;
   3. H₂O + O₂ -> H₂O₂;
   4. KNO₃ -> KNO₂ + O₂;
   
   
4. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   2. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   4. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   
   
5. The values taken from the experiment conducted in the laboratory indicated that:
   1. air were released as result of the decomposition;
   2. we do not possess enough information to decide what gas was released from the reaction;
   3. the ideal model of a gas approximated the best the behavior of the released gas;
   4. oxigen were released as result of the decomposition;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pentru stare gazoasa:
   1. presiunea este neschimbata cānd apare o reactie chimica;
   2. presiunea este aproximativ aceeasi ca si īn stare lichida;
   3. presiunea este mult mai mare decāt īn stare lichida;
   4. presiunea se pot modifica atunci cānd apare o reactie chimica;
   5. presiunea este exact la fel ca si īn stare lichida;
   
   
2. O ecuatie de stare pentru un gaz real este:
   1. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   2. o relatie īntre un anumit numar de parametri de stare;
   3. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   4. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   5. o relatie obtinut dupa efectuarea experimentului;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   2. deschiderea unei sticle de apa cu bule;
   3. H₂O + O₂ -> H₂O₂;
   4. KNO₃ -> KNO₂ + O₂;
   5. KCl + O₂ -> KClO₃;
   
   
4. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   5. cresterea presiunii unui gaz cānd s-a īncalzit;
   
   
5. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. aer a fost eliberat ca urmare a descompunerii;
   2. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   4. oxigenul au fost eliberat ca urmare a descompunerii;
   5. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   

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

1. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. H₂O + O₂ -> H₂O₂;
   2. opening a bubble water bottle;
   3. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   4. KNO₃ -> KNO₂ + O₂;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   2. 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 worst the behavior of the released gas;
   4. we do not possess enough information to decide what gas was released from the reaction;
   
   
3. For gaseous state:
   1. we need to take supplementary precautions in the laboratory;
   2. the pressure depends on the model which are used to approximate it;
   3. the pressure is exactly the same as in liquid state;
   4. the pressure is much higher than in liquid state;
   
   
4. A state equation for a real gas is:
   1. a relation which is always true, independent of the values of the state parameters;
   2. a relation obtained after conducting of the experiment;
   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;
   
   
5. 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. increasing of the pressure of a gas when was heated;
   4. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. H₂O + O₂ -> H₂O₂;
   2. deschiderea unei sticle de apa cu bule;
   3. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   4. KNO₃ -> KNO₂ + O₂;
   5. Ag + O₂ -> Ag₂O;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. 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 rau comportamentul gazului eliberat;
   4. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   5. oxigenul au fost eliberat ca urmare a descompunerii;
   
   
3. Pentru stare gazoasa:
   1. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   2. presiunea depinde de modelul care este utilizat pentru o aproxima;
   3. presiunea este exact la fel ca si īn stare lichida;
   4. presiunea este mult mai mare decāt īn stare lichida;
   5. presiunea este neschimbata cānd apare o reactie chimica;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   2. o relatie obtinut dupa efectuarea experimentului;
   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 īntre un numar nelimitat de parametri de stare;
   
   
5. 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. cresterea presiunii unui gaz cānd s-a īncalzit;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   5. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   
   

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

1. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   2. we do not possess enough information to decide what gas was released from the reaction;
   3. air were released as result of the decomposition;
   4. the ideal model of a gas approximated the best the behavior of the released gas;
   
   
2. A state equation for a real gas is:
   1. a relation obtained after conducting of the experiment;
   2. a relation which may involve some constants dependent of gas composition;
   3. a relation which is always true, independent of the values of the state parameters;
   4. a relation between an unlimited number of state parameters;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KClO₃ -> KCl + O₂;
   2. H₂O₂ -> H₂O + O₂;
   3. KNO₂ + O₂ -> KNO₃;
   4. KNO₃ -> KNO₂ + O₂;
   
   
4. For gaseous state:
   1. the pressure is unchanged when a chemical reaction occurs;
   2. the pressure is approximately the same as in liquid state;
   3. it exists an equation for all, p · V = n · R · T;
   4. the pressure is subject to change when a chemical reaction occurs;
   
   
5. In the laboratory were studied:
   1. increasing of the pressure of a gas when was heated;
   2. the lost of the mass of a solid as result of producing of some gas;
   3. 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;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. aer a fost eliberat ca urmare a descompunerii;
   4. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   
   
2. O ecuatie de stare pentru un gaz real este:
   1. o relatie obtinut dupa efectuarea experimentului;
   2. o relatie care poate implica unele constante dependente de compozitia gazului;
   3. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   4. o relatie īntre un numar nelimitat de parametri de stare;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KClO₃ -> KCl + O₂;
   2. H₂O₂ -> H₂O + O₂;
   3. KNO₂ + O₂ -> KNO₃;
   4. KNO₃ -> KNO₂ + O₂;
   
   
4. Pentru stare gazoasa:
   1. presiunea este neschimbata cānd apare o reactie chimica;
   2. presiunea este aproximativ aceeasi ca si 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;
   5. presiunea depinde de modelul care este utilizat pentru o aproxima;
   
   
5. Īn laborator s-au studiat:
   1. cresterea presiunii unui gaz cānd s-a īncalzit;
   2. pierdut din masa de solid ca urmare a producerii unor gaze;
   3. 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;
   
   

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

1. For gaseous state:
   1. the pressure is subject to change when a chemical reaction occurs;
   2. the pressure is unchanged when a chemical reaction occurs;
   3. the pressure is exactly the same as in liquid state;
   4. the pressure is much higher than in liquid state;
   
   
2. A state equation for a real gas is:
   1. a relation obtained after conducting of the experiment;
   2. a relation between an unlimited number of state parameters;
   3. usable in the laboratory, but is not to be used somewhere else;
   4. a relation which may involve some constants dependent of gas composition;
   
   
3. In the laboratory were studied:
   1. increasing of the pressure of a gas when was heated;
   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 + O₂;
   4. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. opening a bubble water bottle;
   2. KNO₂ + O₂ -> KNO₃;
   3. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   4. KClO₃ -> KCl + O₂;
   
   
5. The values taken from the experiment conducted in the laboratory indicated that:
   1. the ideal model of a gas approximated the best the behavior of the released gas;
   2. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   3. ozone were released as result of the decomposition;
   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. Pentru stare gazoasa:
   1. presiunea se pot modifica atunci cānd apare o reactie chimica;
   2. presiunea este neschimbata cānd apare o reactie chimica;
   3. presiunea este exact la fel ca si īn stare lichida;
   4. presiunea este mult mai mare decāt īn stare lichida;
   
   
2. O ecuatie de stare pentru un gaz real este:
   1. o relatie obtinut dupa efectuarea experimentului;
   2. o relatie īntre un numar nelimitat de parametri de stare;
   3. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   4. o relatie care poate implica unele constante dependente de compozitia gazului;
   
   
3. Īn laborator s-au studiat:
   1. cresterea presiunii unui gaz cānd s-a īncalzit;
   2. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   5. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   
   
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. KNO₂ + O₂ -> KNO₃;
   3. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   4. KClO₃ -> KCl + O₂;
   
   
5. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   2. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   3. ozonul au fost eliberat ca urmare a descompunerii;
   4. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   5. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   
   

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 between an certain number of state parameters;
   2. a relation which takes into account certain deviations from the ideal model;
   3. a relation derived to approximate the relation between state parameters;
   4. a relation obtained after conducting of the experiment;
   
   
2. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. Ag + O₂ -> Ag₂O;
   2. H₂O + O₂ -> H₂O₂;
   3. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   4. KNO₂ + O₂ -> KNO₃;
   
   
3. In the laboratory were studied:
   1. increasing of the pressure of a gas when was heated;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   4. increasing of the temperature of a solid mass when was heated;
   
   
4. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   2. we do not possess enough information to decide what gas was released from the reaction;
   3. oxigen were released as result of the decomposition;
   4. we possess enough information to decide what gas was released from the reaction;
   
   
5. For gaseous state:
   1. the pressure is much lower than in liquid state;
   2. the pressure is unchanged when a chemical reaction occurs;
   3. it exists an equation for all, p · V = n · R · T;
   4. we need to take supplementary precautions in the laboratory;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un anumit numar de parametri de stare;
   2. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   3. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   4. o relatie obtinut dupa efectuarea experimentului;
   5. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. Ag + O₂ -> Ag₂O;
   2. H₂O + O₂ -> H₂O₂;
   3. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   4. KNO₂ + O₂ -> KNO₃;
   5. KNO₃ -> KNO₂ + O₂;
   
   
3. Īn laborator s-au studiat:
   1. cresterea presiunii unui gaz cānd s-a īncalzit;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   4. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   5. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   
   
4. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. oxigenul au fost eliberat ca urmare a descompunerii;
   4. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
5. Pentru stare gazoasa:
   1. presiunea este mult mai mica decāt īn stare lichida;
   2. presiunea este neschimbata cānd apare o reactie chimica;
   3. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   4. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. Why moisten the paper with solution of sodium nitrate?
   1. to accomodate ourselves to use chemicals;
   2. to provide cations for analysis;
   3. for the paper to work as isolator;
   4. to be cut easily with scissors;
   
   
2. The paper requires before analysis of the sample:
   1. to be dry;
   2. to be acidified;
   3. to measure its surface;
   4. to be moistened with an electrolyte;
   
   
3. When the electrical circuit is closed:
   1. water dissociation is inhibited;
   2. electric current passes the sample and the paper;
   3. cations from the solution are passed into sample as metals;
   4. anions from the solution are passed into sample as metals;
   
   
4. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
5. When aluminum is identified:
   1. only one identification reaction is possible;
   2. the presence of other ions may produce a true positive outcome;
   3. using of alizarin along with ammonium hidroxide provide a red colored complex;
   4. there are many identification reactions possible;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa ne acomodam in a utiliza substante chimice;
   2. pentru furniza cationi pentru analiza;
   3. pentru ca hartia sa actioneze ca izolator;
   4. sa fie taiat cu usurinta cu foarfeca;
   5. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie uscata;
   2. sa fie acidulata;
   3. sa i se masoare suprafata;
   4. sa fie umezita cu un electrolit;
   
   
3. Cānd circuitul electric este īnchis:
   1. disocierea apei este inhibata;
   2. curent electric trece prin proba si hārtie;
   3. cationii din solutie sunt trecuti īn proba ca metale;
   4. anionii din solutie sunt trecuti īn proba ca metale;
   
   
4. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   5. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
5. Cānd aluminiu este identificat:
   1. doar o reactie de identificare este posibila;
   2. prezenta altor ioni poate produce un rezultat adevarat pozitiv;
   3. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   4. exista multe reactii posibile de identificare;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When aluminum is identified:
   1. using of ammonium hidroxide is enough in order to have a clear guess about the presence of aluminum;
   2. supplementary precautions should be taken, because the plates are made from aluminum too;
   3. is identified as Al³⁺ cation;
   4. the presence of other ions may produce a true positive outcome;
   
   
2. When lead is identified:
   1. a violet complex appears;
   2. a heat release is observed;
   3. a red-brown complex appears;
   4. a yellow complex appears;
   
   
3. This method of analysis of metals and alloys is:
   1. too ancient to be used today in the laboratory;
   2. not useful for both metals and alloys;
   3. useful for alloys, not so useful for metals;
   4. useful for both metals and alloys;
   
   
4. The paper requires before analysis of the sample:
   1. to be dry;
   2. to be weighted;
   3. to be cut in small pieces;
   4. to be tested;
   
   
5. When the electrical circuit is closed:
   1. anions from the solution are passed into sample as metals;
   2. electric current passes the sample and the paper;
   3. electric current avoids the sample and the paper;
   4. elements from the solution are passed into sample as metals;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd aluminiu este identificat:
   1. folosirea hidroxidului de amoniu este suficient pentru a avea indicii clare cu privire la prezenta aluminiului;
   2. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   3. este identificat ca cationul Al³⁺;
   4. prezenta altor ioni poate produce un rezultat adevarat pozitiv;
   
   
2. Cānd plumbul este identificat:
   1. apare un complex violet;
   2. se observa o eliberare de caldura;
   3. apare un complex rosu-brun;
   4. apare un complex galben;
   
   
3. Aceasta metoda de analiza de metale si aliaje este:
   1. prea veche pentru a fi utilizata īn prezent īn laborator;
   2. nu este utila nici pentru metale nici pentru aliaje;
   3. utila pentru aliaje, nu atāt de utila pentru metale;
   4. utila atāt pentru metale si aliaje;
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa fie uscata;
   2. sa fie cantarita;
   3. sa fie taiata īn bucati mici;
   4. sa fie testata;
   
   
5. Cānd circuitul electric este īnchis:
   1. anionii din solutie sunt trecuti īn proba ca metale;
   2. curent electric trece prin proba si hārtie;
   3. curent electric evita proba si hārtia;
   4. elemente din solutie sunt trecute īn proba ca metale;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When the electrical circuit is closed:
   1. elements from the metals are passed into solution as cations;
   2. water dissociation is inhibited;
   3. elements from the metals are passed into solution as anions;
   4. electric current passes the sample and the paper;
   
   
2. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
3. When lead is identified:
   1. dangerous substances are used;
   2. a violet complex appears;
   3. a red-brown complex appears;
   4. the reactions used clearly indicates its presence;
   
   
4. Why moisten the paper with solution of sodium nitrate?
   1. for the paper to work as isolator;
   2. to accomodate ourselves to use chemicals;
   3. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   4. to have something to do in the laboratory;
   
   
5. This method of analysis of metals and alloys is:
   1. too ancient to be used today in the laboratory;
   2. a quantitative method of analysis;
   3. useful for pure metals, not so useful for alloys;
   4. a nondestructive method of analysis;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd circuitul electric este īnchis:
   1. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   2. disocierea apei este inhibata;
   3. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   4. curent electric trece prin proba si hārtie;
   5. cationii din solutie sunt trecuti īn proba ca metale;
   
   
2. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   5. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   
3. Cānd plumbul este identificat:
   1. sunt utilizate substante periculoase;
   2. apare un complex violet;
   3. apare un complex rosu-brun;
   4. reactiile utilizate īn mod clar ii indica prezenta;
   
   
4. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru ca hartia sa actioneze ca izolator;
   2. sa ne acomodam in a utiliza substante chimice;
   3. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   4. pentru a avea ceva de a face īn laborator;
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. prea veche pentru a fi utilizata īn prezent īn laborator;
   2. o metoda cantitativa de analiza;
   3. utila pentru metale pure, nu atāt de utila pentru aliaje;
   4. o metoda nedistructiva de analiza;
   5. utila atāt pentru metale si aliaje;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. a nondestructive method of analysis;
   2. too ancient to be used today in the laboratory;
   3. useful for pure metals, not so useful for alloys;
   4. useful for alloys, not so useful for metals;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. to be cut easily with scissors;
   2. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   3. to have something to do in the laboratory;
   4. for the paper to work as isolator;
   
   
3. The paper requires before analysis of the sample:
   1. to be cut in small pieces;
   2. to be acidified;
   3. to be burned;
   4. to be tested;
   
   
4. When lead is identified:
   1. a blue complex appears;
   2. a red-brown complex appears;
   3. a violet complex appears;
   4. a yellow complex appears;
   
   
5. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   4. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda nedistructiva de analiza;
   2. prea veche pentru a fi utilizata īn prezent īn laborator;
   3. utila pentru metale pure, nu atāt de utila pentru aliaje;
   4. utila pentru aliaje, nu atāt de utila pentru metale;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa fie taiat cu usurinta cu foarfeca;
   2. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   3. pentru a avea ceva de a face īn laborator;
   4. pentru ca hartia sa actioneze ca izolator;
   
   
3. Hartia necesita ca īnainte de analiza probei:
   1. sa fie taiata īn bucati mici;
   2. sa fie acidulata;
   3. sa fie arsa;
   4. sa fie testata;
   5. sa fie cantarita;
   
   
4. Cānd plumbul este identificat:
   1. apare un complex albastru;
   2. apare un complex rosu-brun;
   3. apare un complex violet;
   4. apare un complex galben;
   5. interferenta altor ioni poate afecta rezultatul;
   
   
5. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   4. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When the electrical circuit is closed:
   1. surface of the sample is fastly covered by a protecting shield of electrons;
   2. anions from the solution are passed into sample as metals;
   3. elements from the metals are passed into solution as cations;
   4. cations from the solution are passed into sample as metals;
   
   
2. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
3. Why moisten the paper with solution of sodium nitrate?
   1. to be cut easily with scissors;
   2. to have something to do in the laboratory;
   3. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   4. to accomodate ourselves to use chemicals;
   
   
4. When aluminum is identified:
   1. using of alizarin along with ammonium hidroxide provide a red colored complex;
   2. the presence of other ions may produce a false negative outcome;
   3. using of alizarin along with ammonium hidroxide provide a more selective indication about the presence of aluminum;
   4. only one identification reaction is possible;
   
   
5. When lead is identified:
   1. a heat release is observed;
   2. dangerous substances are used;
   3. precautions should be made for toxic wastes disposal;
   4. interference of other ions may affect the outcome;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd circuitul electric este īnchis:
   1. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   2. anionii din solutie sunt trecuti īn proba ca metale;
   3. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   4. cationii din solutie sunt trecuti īn proba ca metale;
   
   
2. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   5. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
3. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa fie taiat cu usurinta cu foarfeca;
   2. pentru a avea ceva de a face īn laborator;
   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 ca hartia sa actioneze ca izolator;
   
   
4. Cānd aluminiu este identificat:
   1. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   2. prezenta altor ioni poate produce un rezultat fals negativ;
   3. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un indiciu mai selectiv cu privire la prezenta aluminiului;
   4. doar o reactie de identificare este posibila;
   5. este identificat ca cationul Al²⁺;
   
   
5. Cānd plumbul este identificat:
   1. se observa o eliberare de caldura;
   2. sunt utilizate substante periculoase;
   3. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   4. interferenta altor ioni poate afecta rezultatul;
   5. apare un complex albastru;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Titration as a laboratory operation involves:
   1. a pH indicator that changes color depending on the pH of the solution;
   2. a salt solution;
   3. a mass measurement;
   4. a pH-metter;
   
   
2. When a chemical reaction is balanced, following should be considered:
   1. the liquid in the burette should be at the same level before and after conducting the experiment;
   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 principle of the conservation of the energy;
   
   
3. The following chemical reactions were used in the experiments:
   1. H₂O + CO₂ -> H₂CO₃
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   
   
4. The density of the solutions depends on:
   1. pressure;
   2. provider;
   3. concentration;
   4. time elapsed since were prepared;
   
   
5. The equivalence point is:
   1. indicated when a color change is observed into the solution;
   2. the point in which a reactive should be added in the burette;
   3. something rarely encountered in chemistry;
   4. the point in which a reactive should be added in the reaction flask;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Titrarea ca o operatiune de laborator implica:
   1. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   2. o solutie de sare;
   3. masurarea masei;
   4. un pH-metru;
   5. o solutie de hidroxid de sodiu;
   
   
2. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   2. principiul conservarii numarul de atomi pentru fiecare element;
   3. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   4. principiul conservarii energiei;
   5. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   
   
3. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂O + CO₂ -> H₂CO₃
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   5. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
4. Densitatea solutiilor depinde de:
   1. presiune;
   2. furnizor;
   3. concentratie;
   4. timpul scurs de cand au fost pregatite;
   5. cantitate;
   
   
5. Punctul de echivalenta este:
   1. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   2. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   3. ceva rar īntālnit īn chimie;
   4. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   5. folosit pentru a echilibra ecuatia;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. A redox process:
   1. involves changing of the oxidation states of some participants to the reaction;
   2. is always fast and safe;
   3. is considered to be the following one: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
2. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the number of atoms for each element;
   2. all glassware should be clean before, after and during the experiment;
   3. the liquid in the burette should be at the same level before and after conducting the experiment;
   4. the principle of the conservation of the volume;
   
   
3. Titration as a laboratory operation involves:
   1. a pH indicator that changes color depending on the pH of the solution;
   2. a mass measurement;
   3. a salt solution;
   4. a sulphuric acid solution;
   
   
4. The indicator should be added:
   1. in small quantities, to avoid the errors in observations and in calculations;
   2. only at the suggestion of the supervisor;
   3. to provide a color change at equivalence point;
   4. in large quantities, according to the principle 'only size matters';
   
   
5. In the calculations:
   1. are necessary to discuss with our colleagues;
   2. are necessary to use some formulas expressing in different ways the concentration;
   3. are necessary to draw the tables in our notebooks after completing of the experiment;
   4. are necessary to use our phones;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Un proces redox:
   1. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   2. este īntotdeauna rapid si sigur;
   3. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   5. apare numai atunci cānd se amesteca substante gresit īn laborator;
   
   
2. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii numarul de atomi pentru fiecare element;
   2. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   3. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   4. principiul conservarii volumului;
   
   
3. Titrarea ca o operatiune de laborator implica:
   1. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   2. masurarea masei;
   3. o solutie de sare;
   4. o solutie de acid sulfuric;
   
   
4. Trebuie adaugat indicatorul:
   1. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   2. numai la sugestia supraveghetorului;
   3. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   4. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   
   
5. In calcule:
   1. este necesar sa discutam cu colegii;
   2. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   3. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   4. este necesar sa utilizam telefoanele;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Titration as a laboratory operation involves:
   1. a salt solution;
   2. a pH indicator that changes color depending on the pH of the solution;
   3. a volume measurement;
   4. a burette;
   
   
2. The indicator should be added:
   1. to provide a color change at equivalence point;
   2. to indicate our safety limits when we dealt with chemicals;
   3. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   4. in small quantities, to avoid the errors in observations and in calculations;
   
   
3. A redox process:
   1. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. involves changing of the oxidation states of some participants to the reaction;
   3. occurs only when we mix wrong substances in the laboratory;
   4. involves a transfer of electrons from one atom or group of atoms to another;
   
   
4. 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. all glassware should be clean before, after and during the experiment;
   4. the principle of the conservation of the number of atoms for each element;
   
   
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. have as effect the change of the color of a solution;
   4. are always fast, taking place almost instantaneously;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Titrarea ca o operatiune de laborator implica:
   1. o solutie de sare;
   2. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   3. masurarea volumului;
   4. o biureta;
   5. amestecul a doua sau mai multe solutii;
   
   
2. Trebuie adaugat indicatorul:
   1. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   2. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   3. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   4. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   5. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   
   
3. Un proces redox:
   1. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   3. apare numai atunci cānd se amesteca substante gresit īn laborator;
   4. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   
   
4. 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. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   4. principiul conservarii numarul de atomi pentru fiecare element;
   
   
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. au ca efect schimbarea culorii unei solutii;
   4. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   5. au drept consecinta dizolvarea unei sari;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Reactions between acids and bases:
   1. are always fast, taking place almost instantaneously;
   2. have as a consequence the dissolution of a salt;
   3. are all exothermic, being therefore dangerous outside of the laboratory;
   4. are rarely useful, and even rarely used;
   
   
2. The density of the solutions depends on:
   1. concentration;
   2. quantity;
   3. provider;
   4. temperature;
   
   
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. In the calculations:
   1. are necessary to draw the tables in our notebooks after completing of the experiment;
   2. are necessary to use some formulas expressing in different ways the concentration;
   3. are necessary to take some information from reagent bottles;
   4. are necessary to establish the coefficients of the chemical reaction;
   
   
5. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the energy;
   2. the liquid in the burette should be at the same level before and after conducting the experiment;
   3. all glassware should be clean before, after and during the experiment;
   4. all glassware should be clean before and after conducting the experiment;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Reactiile īntre acizi si baze:
   1. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   2. au drept consecinta dizolvarea unei sari;
   3. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   4. sunt rareori utile, si chiar mai rar utilizate;
   5. au ca efect schimbarea culorii unei solutii;
   
   
2. Densitatea solutiilor depinde de:
   1. concentratie;
   2. cantitate;
   3. furnizor;
   4. temperatura;
   5. presiune;
   
   
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. In calcule:
   1. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   2. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   3. este necesar a se lua unele informatii de pe sticlele de reactivi;
   4. este necesara stabilirea coeficientilor reactiei chimice;
   
   
5. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii energiei;
   2. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   3. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   4. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. A redox process:
   1. involves changing of the oxidation states of some participants to the reaction;
   2. involves a transfer of electrons from one atom or group of atoms to another;
   3. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
2. The indicator should be added:
   1. only at the suggestion of the supervisor;
   2. in small quantities, to avoid the errors in observations and in calculations;
   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';
   
   
3. The density of the solutions depends on:
   1. concentration;
   2. quantity;
   3. provider;
   4. time elapsed since were prepared;
   
   
4. 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. always have as a consequence the formation of a quantity of water;
   4. are always fast, taking place almost instantaneously;
   
   
5. The following chemical reactions were used in the experiments:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Un proces redox:
   1. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   2. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   3. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
2. Trebuie adaugat indicatorul:
   1. numai la sugestia supraveghetorului;
   2. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   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";
   
   
3. Densitatea solutiilor depinde de:
   1. concentratie;
   2. cantitate;
   3. furnizor;
   4. timpul scurs de cand au fost pregatite;
   
   
4. 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. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   4. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   5. au ca efect schimbarea culorii unei solutii;
   
   
5. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. H₂SO₄ + NaOH -> Na₂SO₄ + 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 mineral acidity:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   
   
2. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   2. NaOH + HCOO^- -> HCOONa + HO^-
   3. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   4. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   
3. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
4. EDTA is used:
   1. for indication of the equilibrium point in the reaction;
   2. for complexing of Na¹⁺ and K¹⁺ ions;
   3. for complexing of Ca²⁺ and Mg²⁺ ions;
   4. for safety precautions purposes;
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. hardness;
   2. total acidity;
   3. color;
   4. mineral acidity;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   2. NaOH + HCOO^- -> HCOONa + HO^-
   3. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   4. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
4. EDTA este utilizat:
   1. pentru indicarea punctului de echilibru īn reactie;
   2. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   3. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   4. ca masura de siguranta;
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. duritate;
   2. aciditate totala;
   3. culoare;
   4. aciditate minerala;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   3. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   4. NaOH + Cl⁺ -> NaCl + HO⁺
   
   
2. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + CO₃^2- -> HCO₃^- + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   
3. EDTA is used:
   1. for indication of the equilibrium point in the reaction;
   2. as reagent for determining the hardness of the water;
   3. for complexing of Ca²⁺ and Mg²⁺ ions;
   4. for complexing of Na¹⁺ and K¹⁺ ions;
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   2. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   3. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   4. NaOH + HCOO^- -> HCOONa + HO^-
   
   
5. In the laboratory were analyzed:
   1. the softness of the water;
   2. the mass of the water;
   3. the solubility of the water;
   4. the hardness of the water;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   3. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   4. NaOH + Cl⁺ -> NaCl + HO⁺
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + CO₃^2- -> HCO₃^- + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   
3. EDTA este utilizat:
   1. pentru indicarea punctului de echilibru īn reactie;
   2. ca reactiv pentru determinarea duritatii apei;
   3. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   4. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   5. ca masura de siguranta;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   2. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   3. NaOH + CO₃^2- -> HCO₃^- + HO^-
   4. NaOH + HCOO^- -> HCOONa + HO^-
   
   
5. Īn laborator au fost analizate:
   1. moliciunea apei;
   2. masa apei;
   3. solubilitatea apei;
   4. duritatea apei;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   
   
2. EDTA is used:
   1. for safety precautions purposes;
   2. for complexing of Na¹⁺ and K¹⁺ ions;
   3. as reagent for determining the hardness of the water;
   4. for recharging of the resin for water softening;
   
   
3. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + Cl⁺ -> NaCl + HO⁺
   3. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   4. NaOH + NO₃^- -> NaNO₃ + HO^-
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   2. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   3. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   4. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   
   
5. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   3. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + HO^- -> H₂O+Cl^-
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   
   
2. EDTA este utilizat:
   1. ca masura de siguranta;
   2. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   3. ca reactiv pentru determinarea duritatii apei;
   4. pentru reīncarcarea rasinii la dedurizarea apei;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + Cl⁺ -> NaCl + HO⁺
   3. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   4. NaOH + NO₃^- -> NaNO₃ + HO^-
   5. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   2. NaOH + CO₃^2- -> HCO₃^- + HO^-
   3. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   4. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   5. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   3. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   5. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. 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 good for drinking, it is nothing to be analysed;
   4. water is pure only when is taken from a good freshwater mountain stream;
   
   
2. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Cl^- -> NaCl + HO^-
   2. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   
3. In the laboratory the water were:
   1. softened using the resin column;
   2. hardened using the resin column;
   3. alkalinized for drinking purposes;
   4. acidified for drinking purposes;
   
   
4. In the laboratory were analyzed:
   1. the hardness of the water;
   2. the mass of the water;
   3. the softness of the water;
   4. the concentration of the water;
   
   
5. EDTA is used:
   1. for recharging of the resin for water softening;
   2. for complexing of Na¹⁺ and K¹⁺ ions;
   3. for complexing of Ca²⁺ and Mg²⁺ ions;
   4. as reagent for determining the hardness of the water;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Putem spune urmatoarele:
   1. apa naturala poate contine materie organica si organisme vii;
   2. purificarea apei poate include procedee fizice;
   3. apa este buna pentru consum, nu este nimic de a fi analizat;
   4. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + Cl^- -> NaCl + HO^-
   2. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   
3. In laborator apa au fost:
   1. dedurizata folosind coloana de rasina;
   2. calita folosind coloana de rasina;
   3. alcalinizeaza pentru baut;
   4. acidulata pentru baut;
   
   
4. Īn laborator au fost analizate:
   1. duritatea apei;
   2. masa apei;
   3. moliciunea apei;
   4. concentratia apei;
   5. solubilitatea apei;
   
   
5. EDTA este utilizat:
   1. pentru reīncarcarea rasinii la dedurizarea apei;
   2. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   3. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   4. ca reactiv pentru determinarea duritatii apei;
   5. pentru indicarea punctului de echilibru īn reactie;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   4. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   
   
2. For a water sample following measures may be quantitatively expressed:
   1. total acidity;
   2. total alkalinity;
   3. mineral acidity;
   4. purity;
   
   
3. In the laboratory the water were:
   1. alkalinized for drinking purposes;
   2. softened using the resin column;
   3. hardened using the resin column;
   4. complexed by using EDTA titrimetric method;
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   2. NaOH + HCOO⁺ -> HCOONa + HO⁺
   3. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   4. NaOH + HCOO^- -> HCOONa + HO^-
   
   
5. In the laboratory were analyzed:
   1. the solubility of the water;
   2. the softness of the water;
   3. the hardness of the water;
   4. the alkalinity of the water;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   4. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   
   
2. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate totala;
   2. alcalinitate totala;
   3. aciditate minerala;
   4. puritate;
   5. culoare;
   
   
3. In laborator apa au fost:
   1. alcalinizeaza pentru baut;
   2. dedurizata folosind coloana de rasina;
   3. calita folosind coloana de rasina;
   4. complexata prin metoda titrimetrica EDTA;
   5. acidulata pentru baut;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CO₃^2- -> HCO₃^- + HO^-
   2. NaOH + HCOO⁺ -> HCOONa + HO⁺
   3. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   4. NaOH + HCOO^- -> HCOONa + HO^-
   
   
5. Īn laborator au fost analizate:
   1. solubilitatea apei;
   2. moliciunea apei;
   3. duritatea apei;
   4. alcalinitatea apei;
   5. concentratia apei;
   
   

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

1. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
2. Corrosion of metals:
   1. is a beneficial process that shows the stability of metals;
   2. is helping in the process of cleaning the metals surfaces;
   3. is the protection in time to chemical agents;
   4. can be reduced by electroplating;
   
   
3. The aluminum plate:
   1. the mass is measured before and after immersing it in NaOH;
   2. was corroded in sodium hydroxide solution;
   3. the volume is measured before and after immersing it in NaOH;
   4. was degreased in sodium hydroxide solution;
   
   
4. The zinc plate:
   1. the mass is measured before and after immersing it in H₂SO₄;
   2. was involved in the gravimetric method of corrosion analysis
   3. the volume is measured before and after immersing it in H₂SO₄;
   4. was involved in the volumetric method of corrosion analysis
   
   
5. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. the metal it changes its oxidation state becoming an anion;
   3. when a gas is released its volume depends on the amount of metal corroded;
   4. a gas is released only the corrosion of aluminum;
   
   

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

1. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. Al₂O₃ + NaOH -> NaAlO₂
   5. H⁺ + Zn -> H₂ + Zn²⁺
   
   
2. Coroziunea metalelor:
   1. este un proces benefic care arata stabilitatea metalelor;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. este protectia de durata impotriva agentilor chimici;
   4. poate fi redusa prin galvanizare;
   5. este distrugerea metalelor sub actiunea factorilor externi;
   
   
3. Pentru placa de aluminiu:
   1. masa este masurata īnainte si dupa imersia īn NaOH;
   2. a fost corodata īn solutie de hidroxid de sodiu;
   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;
   
   
4. Pentru placa de zinc:
   1. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   5. a fost corodata īn solutie sulfuric;
   
   
5. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. metalul isi schimba starea de oxidare pentru a deveni un anion;
   3. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   4. un gaz este eliberat numai la corodarea aluminiului;
   5. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   
   

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

1. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Fe -> H₂ + Fe²⁺
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. ZnO + CO -> Zn + CO₂
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
2. The zinc plate:
   1. the surface is measured before and after immersing it in H₂SO₄;
   2. was degreased in sulfuric acid solution;
   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;
   
   
3. 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 mass is measured before and after immersing it in NaOH;
   4. was degreased in sodium hydroxide solution;
   
   
4. Corrosion of metals:
   1. takes place merely from exposure to moisture in air;
   2. is a beneficial process that shows the stability of metals;
   3. can be reduced by electroplating;
   4. can be reduced by passivation;
   
   
5. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an anion;
   2. a gas is released only the corrosion of zinc;
   3. a gas is released at both corrosion of zinc and aluminum;
   4. the metal it changes its oxidation state becoming an cation;
   
   

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

1. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Fe -> H₂ + Fe²⁺
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. ZnO + CO -> Zn + CO₂
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
2. Pentru placa de zinc:
   1. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   2. a fost degresata īn solutie de acid sulfuric;
   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;
   5. a fost corodata īn solutie sulfuric;
   
   
3. 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. masa este masurata īnainte si dupa imersia īn NaOH;
   4. a fost degresata īn solutie de hidroxid de sodiu;
   5. a fost corodata īn solutie de hidroxid de sodiu;
   
   
4. Coroziunea metalelor:
   1. are loc pur si simplu prin expunerea la umiditate īn aer;
   2. este un proces benefic care arata stabilitatea metalelor;
   3. poate fi redusa prin galvanizare;
   4. poate fi redusa prin pasivare;
   
   
5. 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 zincului;
   3. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   4. metalul isi schimba starea de oxidare pentru a deveni un cation;
   5. īntotdeauna metalul isi schimba starea de oxidare;
   
   

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

1. The zinc plate:
   1. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   2. was involved in the gravimetric method of corrosion analysis
   3. the volume is measured before and after immersing it in H₂SO₄;
   4. was involved in the volumetric method of corrosion analysis
   
   
2. Corrosion of metals:
   1. takes place merely from exposure to moisture in air;
   2. is helping in the process of cleaning the metals surfaces;
   3. is the destruction of metals under the action of external factors;
   4. may provide useful raw materials for analysis;
   
   
3. In studied corrosion processes:
   1. when a gas is released its volume depends on the amount of metal corroded;
   2. a gas is released only the corrosion of aluminum;
   3. the metal it changes its oxidation state becoming an cation;
   4. a gas is released only the corrosion of zinc;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. Al₂O₃ + NaOH -> NaAlO₂
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
5. 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. was degreased in sodium hydroxide solution;
   4. the mass is measured before and after immersing it in NaOH;
   
   

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

1. Pentru placa de zinc:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   
2. Coroziunea metalelor:
   1. are loc pur si simplu prin expunerea la umiditate īn aer;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. este distrugerea metalelor sub actiunea factorilor externi;
   4. poate furniza materii prime utile pentru analiza;
   5. poate fi redusa prin pasivare;
   
   
3. Īn procesele de coroziune studiate:
   1. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   2. un gaz este eliberat numai la corodarea aluminiului;
   3. metalul isi schimba starea de oxidare pentru a deveni un cation;
   4. un gaz este eliberat numai la corodarea zincului;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Al₂O₃ + NaOH -> NaAlO₂
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
5. 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. a fost degresata īn solutie de hidroxid de sodiu;
   4. masa este masurata īnainte si dupa imersia īn NaOH;
   
   

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. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
2. Corrosion of metals:
   1. is a beneficial process that shows the stability of metals;
   2. takes place merely from exposure to moisture in air;
   3. can be reduced by electroplating;
   4. is helping in the process of cleaning the metals surfaces;
   
   
3. 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. when a gas is released its volume depends on the amount of metal corroded;
   4. a gas is released only the corrosion of zinc;
   
   
4. The aluminum plate:
   1. was involved in the volumetric method of corrosion analysis
   2. the volume is measured before and after immersing it in NaOH;
   3. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. was corroded in sodium hydroxide solution;
   
   
5. The zinc plate:
   1. the mass is measured before and after immersing it in H₂SO₄;
   2. was degreased in sulfuric acid solution;
   3. was corroded in sulfuric solution;
   4. was involved in the gravimetric method of corrosion analysis
   
   

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. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   5. ZnO + CO -> Zn + CO₂
   
   
2. Coroziunea metalelor:
   1. este un proces benefic care arata stabilitatea metalelor;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. poate fi redusa prin galvanizare;
   4. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   
   
3. 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. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   4. un gaz este eliberat numai la corodarea zincului;
   
   
4. Pentru placa de aluminiu:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. volumul se masoara īnainte si dupa imersia īn NaOH;
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. a fost corodata īn solutie de hidroxid de sodiu;
   5. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   
   
5. Pentru placa de zinc:
   1. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   2. a fost degresata īn solutie de acid sulfuric;
   3. a fost corodata īn solutie sulfuric;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   
   

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

1. In studied corrosion processes:
   1. a gas is released only the corrosion of aluminum;
   2. a gas is released only the corrosion of zinc;
   3. when a gas is released its volume depends on the amount of metal corroded;
   4. the metal it changes its oxidation state becoming an cation;
   
   
2. 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 volume is measured before and after immersing it in H₂SO₄;
   3. was involved in the gravimetric method of corrosion analysis
   4. was involved in the volumetric method of corrosion analysis
   
   
3. The aluminum plate:
   1. was involved in the volumetric method of corrosion analysis
   2. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   3. the mass is measured before and after immersing it in NaOH;
   4. was corroded in sodium hydroxide solution;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. ZnO + CO -> Zn + CO₂
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
5. Corrosion of metals:
   1. takes place merely from exposure to moisture in air;
   2. can be reduced by passivation;
   3. is a beneficial process that shows the stability of metals;
   4. is the destruction of metals under the action of external factors;
   
   

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

1. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea aluminiului;
   2. un gaz este eliberat numai la corodarea zincului;
   3. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   4. metalul isi schimba starea de oxidare pentru a deveni un cation;
   
   
2. Pentru placa de zinc:
   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 H₂SO₄;
   3. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   5. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   
   
3. Pentru placa de aluminiu:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   3. masa este masurata īnainte si dupa imersia īn NaOH;
   4. a fost corodata īn solutie de hidroxid de sodiu;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + CO -> Zn + CO₂
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   5. Fe₂O₃ + CO -> Fe + CO₂
   
   
5. Coroziunea metalelor:
   1. are loc pur si simplu prin expunerea la umiditate īn aer;
   2. poate fi redusa prin pasivare;
   3. este un proces benefic care arata stabilitatea metalelor;
   4. este distrugerea metalelor sub actiunea factorilor externi;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. The intensity of the current:
   1. affect only the quantity of the nickel deposition;
   2. it depends on the surface of the sample;
   3. is to be calculated before to start the experiment;
   4. is to be calculated after conducting the experiment;
   
   
2. It is expected to have a mass of nickel deposited:
   1. inversely proportional with the surface of the sample;
   2. inversely proportional with the intensity of the current used;
   3. proportional with the nickel plating time;
   4. proportional with the intensity of the current used;
   
   
3. At the nickel plating following reactions took place:
   1. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   2. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   3. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the anode: O^2- - 2e^- -> O₂⁰
   4. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   
   
4. Electrical conductivity of nickel salts solutions:
   1. is reduced by salts additions;
   2. depends on the intensity of the current used;
   3. is improved by salts additions;
   4. depends on the potential of the source used;
   
   
5. Theoretical mass of nickel deposited is calculated using:
   1. the electrolysis law;
   2. law of mass action;
   3. the conservation of the number of atoms for each element law;
   4. solutions laws;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. The intensity of the current:
   1. affect only the quantity of the nickel deposition;
   2. is to be calculated before to start the experiment;
   3. affect only the quality of the nickel deposition;
   4. is to be calculated after conducting the experiment;
   
   
2. Theoretical mass of nickel deposited is calculated using:
   1. the electrolysis law;
   2. perfect gas law;
   3. the conservation of the energy law;
   4. the conservation of the number of atoms for each element law;
   
   
3. 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 small;
   
   
4. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel 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 cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   4. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   
   
5. It is expected to have a mass of nickel deposited:
   1. much lower than the calculated theoretical one;
   2. proportional with the surface of the sample;
   3. inversely proportional with the surface of the sample;
   4. much higher than the calculated theoretical one;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Intensitatea curentului:
   1. afecteaza numai cantitatea de nichel depus;
   2. trebuie sa fie calculata īnainte de a īncepe experimentul;
   3. afecteaza numai calitatea depunerii nichelului;
   4. se calculeaza dupa efectuarea experimentului;
   
   
2. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea electrolizei;
   2. legea gazelor perfecte;
   3. legea conservarii energiei;
   4. conservarea numarului de atomi pentru fiecare element;
   
   
3. 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 mica;
   
   
4. La nichelare urmatoarele reactii au avut loc:
   1. la anod (+), īn legatura cu piesa de nichel, 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 catod (-), īn contact cu piesa metalica, Ni²⁺ + 2e^- -> Ni⁰
   4. la anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   5. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   
   
5. Este de asteptat ca masa de nichel depus sa fie:
   1. mult mai mica decāt cea teoretica calculata;
   2. proportionala cu suprafata probei;
   3. invers proportionala cu suprafata probei;
   4. mult mai mare decāt cea teoretica calculata;