WorksheetsGrade 8 Chemistry chapter 5.2
Total questions: 20
Worksheet time: 24mins
Name
Class
Date
1.
What is the chemical formula of Magnesium chloride?
a)
MgCl
b)
MgCl2
c)
MgC
d)
MgC2
2.
What is the chemical formula of sodium sulfate?
a)
SSO4
b)
SoSO4
c)
NaSO4
d)
Na2SO4
3.
What is the name of this chemical, H2SO4?
a)
Hydrogen sulfate
b)
Sulfuric acid
c)
Sulfate
d)
Sulfate hydrogen
4.
What is the formula of Copper (II) oxide?
a)
CUO
b)
CuO
c)
CuO2
d)
Cu2O
5.
What is the formula of nitric acid?
a)
H2SO4
b)
HNO3
c)
HCl
d)
hno3
6.
What is the valency of Calcium (Ca)
a)
1
b)
2
c)
3
d)
4
7.
What is the valency of Nitrogen (N)?
a)
1
b)
2
c)
4
d)
3
8.
How many valence electrons are in an atom of Ba?
a)
2
b)
8
c)
4
d)
1
9.
How many valence electrons are in an atom of Ar?
a)
2
b)
8
c)
4
d)
1
10.
How many valence electrons are in an atom of K?
a)
3
b)
8
c)
4
d)
1
11.
How many valence electrons are in an atom of P?
a)
4
b)
5
c)
2
d)
3
12.
What is the formula of the compound formed between magnesium and oxygen?
a)
MgO
b)
Mg2O2
c)
MgO2
d)
Mg2O
13.
Which of the following correctly represents the electronic distribution in the Mg atom? .
a)
3, 8, 1
b)
2, 8, 2
c)
1, 8, 3
d)
8, 2, 2
14.
Which problem is balanced?
a)
PbO2 + 2H2--> H2SO4
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
d)
2Na + 2H2O --> 2NaOH + H
15.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
16.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
17.
Balance this equation
_N2 + _H2 --> _NH3
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
18.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
19.
The blue numbers in the image below represent ________
a)
Charges
b)
coefficients
c)
subscripts
d)
none of the answers are correct
20.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
6
c)
8
d)
24
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