General Chemistry Ii Jasperse - Electrochemistry Extra Practice Problems With Answers Page 2
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132
Balancing Redox; Electrons Transferred; Oxidizing Agents; Reducing Agents
6.
Balance the following reaction. How many electrons are transferred?
Mg +
O
MgO
→
2
a. 3
b. 4
c. 6
d. 8
e. 2
1. Identify Ox #'s for everything
7.
Methanol fuel cells use the following reaction. How many electrons are transferred in this redox reaction as written?
2. Identify which change
3. For diatomics, initially use a "1" coefficient, and
balance atoms
2CH
OH + 3O
→ 2CO
+ 3H
O
4. How many electrons gained/lost?
3
2
2
2
5. Balance
a.
3
d.
12
b.
6
e.
2
c.
8
8.
What is the coefficient for hydroxide, and how many electrons are transferred after balancing the reaction?
2-
-
-
-
Pb(OH)
+
ClO
PbO
+
Cl
+
OH
+
H
O
→
4
2
2
-
-
a.
2 OH
and 2 electrons
d.
2 OH
and 4 electrons
1. Balance redox atoms first
-
b.
3 OH
and 4 electrons
e.
None of the above
2. Balance charges
-
c.
1 OH
and 2 electrons
3. Balance spectator atoms
-Between balancing charges and atoms,
either can be done first
9.
Cobalt is one of many metals that can be oxidized by nitric acid. Balance the following the reaction. How many
electrons are transferred, and what would be the coefficient for H
O in the balanced reaction?
2
–
+
2+
Co + NO
+
H
→ NO +
H
O +
Co
3
2
a.
3 electrons; 2 H
O
d.
6 electrons; 4 H
O
2
2
b.
6 electrons; 6 H
O
e.
None of the above
2
c.
4 electrons; 2 H
O
2
10. What was oxidized and what was reduced in the following reaction?
Determine all oxidation numbers
2+
+
2Hg
+
N
H
2Hg + N
+
4H
→
and see which change!
2
4
2
"Oxidized" Ox # increased
"Reduced" Ox # reduced
2+
2+
a.
Hg
was oxidized; N
H
was reduced
d.
Hg
was reduced; N
H
was reduced
2
4
2
4
2+
b.
Hg
was reduced; N
H
was oxidized
e.
None of the above
2
4
2+
c.
Hg
was oxidized; N
H
was oxidized
2
4
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