Chemistry: Matter and Change

Section 2: Balancing Redox Reactions

Self Check Quizzes

1
Complete and balance the following redox equation. When properly balanced with whole—number coefficients, the coefficient of S is _________.

H2S + HNO3 → S + NO + H2O
A)1
B)2
C)3
D)4
2
Balance the following ionic equation. What is the coefficient of the reducing agent in this reaction?

Fe2+(aq) + MnO4-(aq) + H+(aq) → Fe3+(aq) + Mn2+(aq) + H2O(l)
A)5
B)1
C)8
D)4
3
What is the net change in oxidation number of iodine in the following ionic reaction?

2MnO4- + I- + H2O → 2MnO2 + IO3- + 2OH-
A)1
B)2
C)3
D)6
4
What is the oxidation number for each of these reactions before the reaction occurs?

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A)-1
B)0
C)1
D)2
5
Balance the following equation with the smallest whole—number coefficients. How many moles of zinc will react with 6 moles of cobalt(III) chloride?

Zn(s) + CoCl3(aq) → ZnCl2(aq) + Co(s)
A)2
B)3
C)6
D)9
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