Chemistry 5B072600, 5B073300 (300 tests) 

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Chemistry 5B072600, 5B073300 (300 tests)

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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 (NA)

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:

A. n (1/ZAA) = n (1/ZBB)

B. m (A) = C (1/ZAA) M (1/ZAA) V (A)/1000

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

D. n (1/ZAA) = C (1/ZAA) V (A)

E. C (1/ZAA) V (A) = C (1/ZBB) 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

Unit of a titer

  1. g/ml
  2. mg / l
  3. kg / m3
  4. mol/l
  5. mg / ml

Unit of molar concentration

  1. mol/l
  2. g/ml
  3. mg / l
  4. g/l
  5. %

Unit of normal concentration

  1. mol/l
  2. g/ml
  3. mg / l
  4. g/l
  5. %

Unit of a mass fraction

A. %

B. mol/l

C. g/ml

D. mg / l

E. g/l

Unit of the number of substance A

  1. mol
  2. g
  3. there is no unit
  4. mol/l
  5. g/mol

Unit of the number of equivalents of substance A

A. mol

B. g

C. there is no unit

D. mol/l

E. g/mol

Unit of an equivalent of substance A

  1. there is no unit
  2. mol/l
  3. g/mol
  4. mol
  5. g

Unit of the molar mass of the substance A

  1. g/mol
  2. there is no unit
  3. mol/l
  4. mol
  5. g

Unit of the molar mass of an equivalent of the substance A

  1. g/mol
  2. there is no unit
  3. mol/l
  4. mol
  5. g

Unit of a number of equivalence of the substance A

  1. there is no unit
  2. mol/l
  3. g/mol
  4. mol
  5. g

Unit of the factor of equivalence

  1. there is no unit
  2. mol/l
  3. g/mol
  4. mol
  5. g

Unit of a density of a solution A

  1. g/ml
  2. g
  3. mol/l
  4. mg / mol
  5. there is no unit

Calculate the normal concentration of the sulfuric acid if its titer is equal 0.02446 g/ml.

  1. 0.4988
  2. 0.5321
  3. 0.1954
  4. 0.2555
  5. 0.7820

Calculate the molar concentration of sodium hydroxide if its titer is equal 0.004020 g/ml.

  1. 0.1005
  2. 0.4563
  3. 0.5619
  4. 0.6721
  5. 0.2968

Calculate the titer of the sulfuric acid, if its normal concentration is 0.1008 mol/l.

  1. 0.004943
  2. 0.001115
  3. 0.007819
  4. 0.003985
  5. 0.006178

Calculate the titer of sodium hydroxide, if its molar concentration is 0.09981 mol/l.

  1. 0.003992
  2. 0.007881
  3. 0.001078
  4. 0.002354
  5. 0.005541

Calculate the molar concentration of the sulfuric acid if its titer is equal 0.004852 g/ml.

  1. 0.04947
  2. 0.01591
  3. 0.07895
  4. 0.06341
  5. 0.02317

Calculate the normal concentration of the sulfuric acid if its titer is equal 0.004852 g/ml

  1. 0.09895
  2. 0.04563
  3. 0.07811
  4. 0.05560
  5. 0.06113

Alkane with octane number 0

A) heptane

В) octane

С) hexane

D) propane

Е) pentane

 

Specify amphoteric oxides

А) Al2O3;ZnO

В) CuO;Na2O

С) ZnO;CO2

D) Na2O;Fe2O3

Е) FeO;P2O5

 

Specify the acid oxides

А) CO2;P2O5

В) CaO;SO3

С) P2O5;Fe2O3

D) Al2O3;K2O

Е) ZnO;CrO3

 

Specify the chloride-ion

А) Cl-

B) Cl2-

С) Cl02

D) Cl4-

E) ClO-4

 

Specify sulfate - ion

А) SO2-4

В) SO-4

С) SO3-4

D) HSO2-4

Е) HS-

295. To define coordination numbers of forming complexes in compounds: K ,

A) 2, 6, 6

B) 1, 4, 3

C) 1, 5, 3

D) 0, 3, 3

E) 1, 4, 3

 

296. To define a charge of forming complex in compound

A) +2, +3

B) +1, +2

C) +1, -1

D) +2, +5

E) +1, +6

 

297. What is the type of reaction H2SO4+ 2NaOH =Na2SO4+ 2Н2O:

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 (NA)

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:

A. n (1/ZAA) = n (1/ZBB)

B. m (A) = C (1/ZAA) M (1/ZAA) V (A)/1000

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

D. n (1/ZAA) = C (1/ZAA) V (A)

E. C (1/ZAA) V (A) = C (1/ZBB) 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

Unit of a titer

  1. g/ml
  2. mg / l
  3. kg / m3
  4. mol/l
  5. mg / ml

Unit of molar concentration

  1. mol/l
  2. g/ml
  3. mg / l
  4. g/l
  5. %

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