Chapter 9 Self-Quiz, page 627
1. (b)
2. (c)
3. (d)
4. (b)
5. (c)
6. (a)
7. (b)
8. (c)
9. False. In the perchlorate ion, ClO4–(aq), the chlorine atom has an oxidation number of
+7.
10. True
11. False. In the combustion of methane, CH4(g) + 2 O2(g) ! CO2(g) + 2 H2O(g),
oxygen is reduced.
12. True
13. False. A chemical equation is said to be balanced if the number of electrons lost by
oxidation is equal to the number of electrons gained by reduction and the total number of
atoms of each element on each side of the equation is equal.
14. True
15. False. The reaction between nickel metal and magnesium ions is non-spontaneous.
16. False. Silver, Ag(s), is a weaker reducing agent than nickel, Ni(s).
17. False. The following is a list of oxidizing agents from strongest to weakest: Ag+(aq),
Cu2+(aq), Pb2+(aq), and Mg2+(aq).
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Chapter 9: Oxidation-Reduction Reactions
9-1