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

ағылшын(51-100)

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Hard

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50 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
15
14
104
85
22
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Specify a unit of measure of quantity of substance
mole
kg
g
g/mole
mole /l
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many atoms three nitrogen molecules
6
4
2
3
1
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate the molar weight of hydroxide of ammonium
35
29
30
15
28
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Specify the formula of nitrate of ammonium
NH4NO3
NH3OH
NH4NO2
NH3
NH4
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Finish the equation and specify substance – х: Ba(OH)2 + H2SO4x +H2O
BaSO4
BaSO3
BaS
Ba2SO4
Ba(SO4)2
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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
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