Electrochemistry Worksheet With Answers Page 3
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5mcdonald (pam78654) – HW 10: Electrochemistry – laude – (89560)
3
2
3+
Explanation:
Cr
O
+ 6 e
2 Cr
2
7
∆G
◦
is negative (point E is lower free en-
+
what is the coefficient for H
in the balanced
ergy than point A), so the standard voltage is
reaction?
positive.
1. 1
009
10.0 points
Which type of widely used battery is NOT
2. 7
rechargeable?
3. 6
1. lead-acid (storage batteries)
4. 36
2. alkaline correct
5. 14 correct
3. nickel-cadmium (NiCad)
Explanation:
4. lithium-ion
The balanced equation is
+
3+
14 H
+ 6 Fe
+ Cr
O
Explanation:
2
7
2+
3+
6 Fe
+ 2 Cr
+ 7 H
O
Alkaline batteries were not designed to be
2
rechargeable and do not do so efficiently, al-
though there are some websites that disagree.
012
10.0 points
Consider the standard reduction potentials
2+
0
Cu
+ 2 e → Cu
= 0.337 V
E
010
10.0 points
+
0
When the equation
Ag
+ 1 e → Ag
= 0.7994 V
E
+
0
Au
+ 1 e → Au
= 1.68 V
E
FeCl
+ Au(s)
Fe(s) + AuCl
3
Which of the following statements about
oxidizing strengths of Group IB metal ions is
is correctly balanced, what is the coefficient
true?
of Fe(s)?
+
1. Ag
is a stronger oxidizing agent than
1. 3
+
Au
.
2. 4
2+
2. Cu
is a stronger oxidizing agent than
+
Au
.
3. 1 correct
+
3. Ag
is a stronger oxidizing agent than
4. 2
2+
Cu
. correct
5. 5
4. Nothing can be predicted about oxidizing
Explanation:
strengths from the data given.
The balanced equation is
2+
5. Cu
is a stronger oxidizing agent than
+
Ag
.
FeCl
+ 3 Au(s)
Fe(s) + 3 AuCl
3
Explanation:
011
10.0 points
013
10.0 points
For a reaction in acid involving the following
What is the cathode in
two half reactions,
3+
2+
+
2+
Fe
+ e
Fe
Ag(s) | Ag
(aq) || Fe
(aq) | Fe(s)
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