ағылшын(51-100)

How many lanthanides is available in D.I. Mendeleyev’stable?

• 15

• 14
  

• 104

• 85

• 22

Specify a unit of measure of quantity of substance

• mole
  

• kg

• g

• g/mole

• mole /l

How many atoms three nitrogen molecules

• 6

• 4

• 2

• 3

• 1

Calculate the molar weight of hydroxide of ammonium

• 35

• 29

• 30

• 15

• 28

Specify the formula of nitrate of ammonium

• NH₄NO₃

• NH₃OH

• NH₄NO₂

• NH₃

• NH₄

Finish the equation and specify substance – х:  Ba(OH)₂ + H₂SO₄x +H₂O

• BaSO₄

• BaSO₃

• BaS

• Ba₂SO₄

• Ba(SO₄)₂

Specify amphoterous hydroxides

• Al(OH)₃;Zn(OH)₂

• Cu(OH)₂;NaOH

• NaOH;KOH

• Cu(OH)₂;Ba(OH)₂

• Ba(OH)₂;Mn(OH)₂

Calculate the molar weight sodium dihydrogenorthophosphate

• 120

• 144

• 56

• 74

• 82

Specify the formula for smell gas

• CO
  

• CO₂

• CH₄

• C₂H₂

• O₃

Calculate valence of nitrogen in ammonia

• 1

• 2

• 3

• 4

• 5