General Chemistry Ii Jasperse - Electrochemistry Extra Practice Problems With Answers Page 3
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11. The following reaction occurs in basic solution. Identify the oxidizing agent. Note the reaction equation is not
balanced.
–
–
2–
T
H
O(l) + Zn(s) + NO
(aq) + OH
(aq) → Zn(OH)
(aq) + NH
(aq)
2
3
4
3
a.
Zn(s)
d.
H
O(l) (the oxygen)
2
–
b.
NO
(aq) (the nitrogen)
e.
NH
(aq) (the nitrogren)
3
3
–
c.
OH
(aq)
12. For the following reaction, which statement, A–D, is not correct? If more than one is not correct, respond E.
–2
2Au + 4Cl
→ 2AuCl
2
4
a.
Au is the reducing agent.
d.
The equation is fully balanced.
b.
Cl
is the oxidizing agent
e.
More than one statement is not correct.
2
c.
Au is oxidized.
13. Which substance is the reducing agent in the following reaction?
2+
2+
Ca(s) + Zn
(aq) → Ca
(aq) + Zn(s)
a.
Ca(s)
d.
Zn(s)
T
2+
b.
Zn
(aq)
e.
None of the above
2+
c.
Ca
(aq)
14. Which substance is the reducing agent in the following reaction?
+
-
2+
4H
(aq) + 2Cl
(aq) + MnO
(s) → Cl
(g) + Mn
(aq) + 2H
O(l)
2
2
2
+
a.
H
(aq)
d.
Cl
(g)
2
-
2+
b.
Cl
(aq)
e.
Mn
(aq)
c.
MnO
(s)
2
15. Which one of the following items does not characterize an oxidizing agent?
a.
An oxidizing agent gains electrons.
b.
An oxidizing agent causes another species to be oxidized.
T
c.
The oxidation number of an oxidizing agent decreases.
7+
d.
A good oxidizing agent is a metal in a high oxidation state, such as Mn
.
e.
An example of a good oxidizing agent is an alkali metal, such as Na.
16. Which of the following statements about electrochemical cells is true?
a. Reduction occurs at the anode
b. An element with a high love for electrons is likely to be easily oxidized
c. Oxidation occurs at the anode
d. Only oxidation half–reactions are useful
e. none of the above
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