Chemistry 5b072600, 5b073300 (300 tests)

1. The elementary object is …

1. Atom, molecule, ion, radical, equivalent and other elementary particles

2. Molecule, ion, radical

3. Equivalent, atom, molecule

4. Molecule, cation, atom

5. Anion, a molecule, cation, atom

2. Specify the Avogadro number (N_A)

А) 6,02·10²³

В) 6,02·10^-23

С) 6,02·10¹⁰

D) 6,02·10¹⁵

Е) 6,02·10^-10

3 . Mathematical expression of the law of equivalents for reaction аА + вВ → сС is:

1. n (1/Z_AA) = n (1/Z_BB)

2. m (A) = C (1/Z_AA) M (1/Z_AA₎ V (A)/1000

3. T (B/A) = m (A)/V (B)

4. n (1/Z_AA) = C (1/Z_AA₎ V (A)

5. C (1/Z_AA) V (A) = C (1/Z_BB) V (B)

4. Finish the definition: molar concentration of substance A is …

1. number of substance A per 1 liter of solution

2. mass of substance A per 1 ml of titrant B

3. mass of substance A to the total mass

4. mass of substance A in the unit of solution volume A

5. number of equivalents of substance A in 1 liter of solution

5 . Finish the definition: normal concentration of substance A is …

1. number of equivalents of substance A per 1 liter of solution

2. mass of substance A in unit of volume of solution of substance A

3. number of substance A per 1 liter of solution

4. mass of substance A per 1 ml of titrant B

5. mass of substance A to the total mass

6. Finish the definition: molar concentration of equivalents of substance А is …

1. Number of equivalents of substance a per 1 liter of solution

2. mass of substance A in unit of volume of solution of substance A

3. number of substance A per 1 liter of solution

4. mass of substance A per 1 ml of titrant B

5. mass of substance A to the total mass

7. Finish the definition: mass concentration of substance A is …

1. mass of substance A per unit of volume of solution of substance A

2. number of substance A per 1 liter of solution

3. mass of substance A in 1 ml of titrant B

4. mass of substance A to the total mass

5. number of equivalents of substance A per 1 liter of solution

8. Finish the definition: the titer of substance A is …

1. special case of mass concentration (unit is g/ml)

2. mass of substance A in unit of volume of solution of substance A

3. amount of substance A in liter of solution

4. amount of equivalents of substance A per 1 liter of solution

5. mass of substance A in 1 ml of titrant B

9. Finish the definition: the mass fraction of substance A is …

1. Mass of substance a to the total mass

2. amount of equivalents of substance A in 1 litre of solution

3. mass of substance A in unit of volume of solution of substance A

4. amount of substance A in 1 litre of solution

5. mass of substance A in 1 ml of titrant B

10. Finish the definition: the density of solution A is …

1. mass of solution A to unit of volume of solution A

2. mass of substance A to the total mass

3. amount of equivalents of substance A in 1 liter of solution

4. mass of substance A in unit of volume of solution of substance A

5. mass of substance A in 1 ml of titrant B

11. Unit of a titer

1. g/ml

2. mg / l

3. kg / m³

4. mol/l

5. mg / ml

12. Unit of molar concentration

1. mol/l

2. g/ml

3. mg / l

4. g/l

5. %

13. Unit of normal concentration

1. mol/l

2. g/ml

3. mg / l

4. g/l

5. %

14. Unit of a mass fraction

1. %

2. mol/l

3. g/ml

4. mg / l

5. g/l

15. Unit of the number of substance A

1. mol

2. g

3. there is no unit

4. mol/l

5. g/mol

16. Unit of the number of equivalents of substance A

1. mol

2. g

3. there is no unit

4. mol/l

5. g/mol

17. Unit of an equivalent of substance A