WorksheetsBalancing Chemical Equations
Total questions: 10
Worksheet time: 3hrs 30mins
Name
Class
Date
1.
How many Hydrogen atoms are in 4H2O?
a)
6
b)
8
c)
2
d)
4
2.
How many Magnesium atoms are in 10MgCl2?
a)
10
b)
5
c)
20
d)
12
3.
How many Nitrogen atoms are in (NH₄)₂CrO₄?
a)
1
b)
2
c)
8
d)
6
4.
How many Hydrogen atoms in 3(NH₄)₂CrO₄?
a)
4
b)
2
c)
8
d)
24
e)
9
5.
A subscript is the small number below the element symbol that tells the number of _______ of that element.
a)
atoms
b)
valence electrons
c)
protons
d)
elements
6.
Balance this equation:
H2 + Cl2 ---> HCl
a)
It is balanced.
b)
H2 + Cl2 ---> 2HCl
c)
3H2 + Cl2 ---> 6HCl
d)
H2 + 3Cl2 ---> 6HCl
7.
Balance this equation:
HgO ---> Hg + O2
a)
It is balanced.
b)
2HgO ---> 2Hg + O2
c)
2HgO ---> Hg + O2
d)
HgO ---> Hg + 2O2
8.
How many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl2 + H2
Mg + __HCl ---> MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
9.
Balance this equation:
P4+O2 --> P2O3
P4+O2 --> P2O3
a)
3 P4+ O2 --> 2 P2O3
b)
P4+ O2 --> 2 P2O3
c)
P4+ 3 O2 --> 2 P2O3
d)
P4 + O2 --> P4O2
10.
Which of the following is balanced?
a)
Mg + HCl --> H2 + MgCl2
b)
H2O + CO2 --> H2CO3
c)
KClO3 --> KCl + O2
d)
H2 + O2 --> H2O
100 %
