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Юриспунденкция

Electrode potential

1.The potential which appears on a metal plate which is in the contact which of the same named ions in a solution, with concentration 1 mole/L by temperature 25 Celsius and the pressure 1atm. is called

1. standard electrode potential

2. diffusion potential

3. hydrogen electrode

4. standard hydrogen electrode

5. electromotive force of a galvanic element

2.In the equation of Nernst e = e⁰ + 2´10^-4 T/n logC_me e⁰ and T denote to

1. standard electrode potential of metal and temperature of a solution in Kelvin

2. electromotive force of a galvanic element and temperature of Kelvin

3. electro conduction of a solution and its absolute temperature

4. specific electro conduction of a solution and its temperature in Celsius

5. standard electrode potentials and temperature of a solution in degrees Celsius

3.Biopotentials which don't relate to the potential that appears in the tissues of the organism

1. membrane potentials

2. interphase potentials

3. diffusion potentials

4. potentials of injury

5. there is no correct answer

4.The branch of the physical chemistry studying the transformation of the chemical and electrical energy is called

1. thermodynamics

2. chemical kinetics

3. electrode potential

4. thermo chemistry

5. electrochemistry

5.The 5 method of definition of the conductivity of the solutions is

1. Potentiometric

2. conductometry

3. complexometry

4. osmometry

5. electrochemistry

6.The sum of mobility of ions (cations, anions) is equal

1. equivalent conductivity at infinite dilution

2. specific conductivity of the solution

3. specific resistance(strength)

4. standard electrode potential

5. constant of a dissociation of an electrolyte

7. A good conducter of electric current is:

1. fat tissue

2. bones

3. skin

4. lungs tissue

5. muscles tissue

8. The electricity in the second kind conductors conducts by:

1. electrons

2. ions

3. electrons and ions

4. pipette

5. no answer

9. Specific conductivity of the solution of electrolyte depends on:

A. osmotic pressure

B. nature of ions

C. radius of ions

D. composition of atmosphere

E. nature of solvent

A code 1. if correctly A C

2. if correctly B C E

3. if correctly D E

4. if correctly A B C D E

5. if correctly D

10. The biological liquids: urine, blood, lymph and so on relate to:

1. first kind conductors

2. second kind conductors

3. third kind conductors

4. are not conductors

5. dielectrics and semiconductors

11.Specific conductivity of the solution of electrolyte decreases by the increasing of concentration of concentration of the substances because:

1. amount of the ions conducting electricity increases

2. interionic interaction increases

3. resintance of the solution decreases

4. viscosity of the solution decreases

5. there is no correct answer

12. The correct scheme of copper-zinc galvanic cell is:

1. Cu¦CuSO₄¦¦Zn

2. Cu¦CuSO₄¦¦Zn

3. Zn¦ZnSO₄¦¦CuSO₄¦Cu

4. Zn¦¦Cu

5. Cu¦¦SO₄^2-¦¦Zn

13. Conductivity is not used in therapy for:

1. treatment of the tissues

2. treatment of the nerves

3. treatment of scars

4. treatment of inflammations

5. there is no correct answer

14. Using methods of conductomery as relation between equivalent conductivity of the solution and its equivalent conductivity at infinite dilution they determine:

1. ionic strength of the solution

2. degree of electrolytic dissociation

3. potential for hydrogen

4. osmotic pressure

5. isotonic coefficient

13. In the method of conductometric titration for the determination of the concentration of the solution they measure

1. electromotive force of the galvanic element

2. freezing temperature of the solution

3. boiling temperature of the solution

4. conductivity of the solution

5. osmotic pressure of the solution

14. Biological liquids are conductors:

1. first kind

2. second kind

3. third kind

4. semiconductors

5. dielectric and semiconductors

15. Specific conductivity of the solution of electrolyte first increases at increasing of the concentration of the substance because

1. amount of ions conducting electricity increases

2. interionic interaction increases

3. resistance of the solution increases

4. viscosity of the solution decreases

5. there is no correct answer

16. Electrode potentials of iron and lead are –0.34 V and –0.13 V. Electromotive force of this galvanic cell is

1. –0.057 V

2. +0.21 V

3. +0.57 V

4. +3.38 V

5. +0.295 V

17. Standard electrode potentials of lead and zinc are –0.12 V and –0.66 V. Electromotive force of lead-zinc galvanic cell at standard conditions is:

1. 0.80 V

2. 0.54 V

3. 6.33 V

4. 0.88 V

5. there is no correct answer

18. Electrode potentials of zinc and nickel are –0.76 V and –0.35 V. Electromotive force is

1. + 1.01 V

2. – 1.01 V

3. + 0.41 V

4. + 3.04 V

5. + 0.33 V

19. Electrode potential of cadmium and copper are –0.5О V and +0.34 V. Electromotive force is:

1. –0.06 V

2. –0.74 V

3. +1.18 V

4. +0.84 V

5. +0.85 V

20. Standard electrode potentials of copper and zinc are +0.24 V and –0.76 V. Electromotive force of copper-zinc galvanic cell is

1. –0.42 V

2. +1.00 V

3. +2.24 V

4. –1.10 V

5. +0.42 V

21. Standard electrode potentials of magnesium and copper are -1.56 V and +0.54 V. Electromotive force of the galvanic cell made of these metals is equal to:

1. –2.10 V

2. +1.70 V

3. +2.02 V

4. –2.70 V

5. no correct answer

22. Electrode potentials of iron and lead are –0.64 V and –0.13 V. Electromotive force of this galvanic cell is

1. –0.057 V

2. +0.51 V

3. +0.57 V

4. +3.38 V

5. +0.295 V

23. Standard electrode potentials of lead and zinc are –0.12 V and –0.86 V. Electromotive force of lead-zinc galvanic cell at standard conditions is:

1. 0.80 V

2. 0.74 V

3. 6.33 V

4. 0.88 V

5. there is no correct answer

24. Electrode potentials of zinc and nickel are –0.96 V and –0.35 V. Electromotive force is

1. + 1.01 V

2. – 1.01 V

3. + 0.61 V

4. + 3.04 V

5. + 0.33 V

25. Electrode potential of cadmium and copper are –0.5О V and

+0.24 V. Electromotive force is:

1. –0.06 V

2. –0.74 V

3. +1.18 V

4. +0.74 V

5. +0.85 V

26. Standard electrode potentials of copper and zinc are +0.24 V and –0.96 V. Electromotive force of copper-zinc galvanic cell is

1. –0.42 V

2. +1.20 V

3. +2.24 V

4. –1.10 V

5.+0.42 V

27. The specific conductivity solution of NH₄OH with equivalent consentration 0.01 mol/l at 18 ^O C equal is 1.02 x 10^-4 om^-1X sm^-1.

The equivalent conductivity this solution equal is:

1. 1.02 x 10^-4 om^-1X sm^-1.

2. 10.2 x 10^-4 om^-1X sm^-1.

3. 1.2 x 10^-4 om^-1X sm^-1.

4. 1.22 x 10^-4 om^-1X sm^-1.

5. 1.42 x 10^-4 om^-1X sm^-1.

28.The equivalent conductivity of acetic acid equal is 3.5 om^-1X sm²x mol ^-1. The limit equivalent conductivity of acetic acid equal is 350 om^-1X sm²x mol ^–1. Degree of dissouciation of acid equal is

1. 0.1

2. 0.01

3. 0.001

4. 0.05

5. 0.025

29. The equivalent conductivity of acetic acid at 25 C with equivalent consentration 0.03 mol/l equal is 8.2 om^-1X sm². The specific conductivity of acid equal is

1.8.2 x10^-5om^-1X sm²

2.82.0 om^-1X10^-5sm²0.05

3. 3.02x10^-5om^-1X sm²

4. 16.4 om^-1xsm²

5. 16.4 x 10^oX sm²

<== попередня сторінка	\|	наступна сторінка ==>
Methodical guidance for laboratory work №6	\|	II. 2. Find such examples in the text and write them down in your exercise book.

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