Англ 1-50

1).Specify value of valence of the atom an carbon:

• 4;2

• 6;2

• 4; 3

• 4; 3

• 6; 4

2). Specify a unit of measure of the substances molar weight: 

• g

• l/mole

• g/mole

• kg/mole

• kg

3).Calculate the relative molar weight of a sulfuric acid

• 0,098

• 980

• 98

• 98

• 0,98

4).Calculate the relative molar weight of the chloride of sodium

• 60,1

• 53,2

• 42

• 58,5

• 72,2

5).Specify the formula of the iron(III) sulfate

• Fe(SO₃)₃

• FeSO₃

• FeS₂

• FeSO₄

• Fe₂(SO₄)₃

6).Finish the equation of reaction and specify the substance – х

Al(OH)₃ + H₂S → x + H₂O

• Al₂S₃

• AlSО₃

• AlSO₄

• Al₂SО₄

• Al₂(SО₄)₃

7).Specify multiacid a hydroxides:

• Al(OH)₃; Fe(OH)₂

• Ca(OH)₂; KOH

• KOH; Fe(OH)₃

• NaOH; HOH

• Fe(OH)₂; NH₄OH

8).Calculate the molar weight for the Ca3(PO4)2

• 310

• 101,6

• 22,5

• 16,6

• 15,5

9).Specify of non-gaseous substance

• H₂

• Mo

• N₂

• PH₃

• O₃

10). Calculate a molar weight mass hydrosulfuric acid

• 17

• 40

• 82

• 66

• 34