Section 20.2
Balancing Redox Equations
Practice Test
1.
Name the spectator ion in the following equation, including the correct coefficient:
Cu
s
+ 4HNO
3
aq
→ Cu
NO
3
2
aq
+ 2NO
2
+ 2H
2
O
l
a.
3NO
2
b.
2NO
3
c.
3NO
3
d.
2NO
2
Hint
2.
Complete and balance the following redox equation. When properly balanced with whole—number coefficients, the coefficient of S is _________.
H
2
S+HNO
3
→ S+NO+H
2
O
SC.B.1.4.2
a.
1
b.
2
c.
3
d.
4
Hint
3.
Determine the net change in oxidation number of chlorine in the following reaction:
ClO
4
-
aq
+ Br
-
aq
→ Cl
-
aq
+ Br
2
g
in acid solution
a.
8
b.
-7
c.
-8
d.
7
Hint
4.
Balance the following ionic equation. What is the coefficient of the reducing agent in this reaction?
Fe
2+
aq
+ MnO
4
-
aq
+ H
+
aq
→ Fe
3+
aq
+Mn
2+
aq
+ H
2
O
l
SC.B.1.4.2
a.
8
b.
5
c.
4
d.
1
Hint
5.
When the following equation is balanced what is the coefficient of Sn?
Sn +HNO
3
→SnO
2
+NO
2
+H
2
O
SC.B.1.4.2
a.
3
b.
2
c.
1
d.
4
Hint
