Nelson Chemistry Chapter 13 Quiz
Click on the correct answer
1
In a functioning electrochemical cell,
anions migrate inside the cell from the anode to the cathode
cations migrate inside the cell from the cathode to the anode
electrons move in the external circuit from the anode to the cathode, where reduction occurs
electrons move in the external circuit from the cathode to the anode, where reduction occurs.
2
A Sn(s)/Sn
2+
(aq) half-cell and a Zn(s)/Zn
2+
(aq) half-cell, each containing 1.0 mol/L solutions, are connected to form an electrochemical cell. The net voltage of this cell is
-0.90 V
-0.62 V
+0.62 V
+0.90 V
3
An electrochemical cell involves the following half reactions:
Ag
+
(aq) + e
-
------> Ag(s) E
o
= +0.80 V
Mn
2+
(aq) + 2e
-
-----> Mn(s) E
o
= -1.18 V
Current is allowed to flow through the cell until the mass of the manganese has changed by 5.49 g. The mass of the silver electrode will have changed by
2.75 G
5.49 g
10.0 g
21.6 g
4
3 Zn
2+
(aq) + 2 Al(s) -------> 3 Zn(s) + 2 Al
3+
(aq)
This equation represents the reaction in an electrochemical cell. The half-cell reaction that occurs at the anode is
Zn(s) -----> 2 e
-
+ Zn
2+
(aq)
Zn
2+
(aq) + 2 e
-
------> Zn(s)
Al(s) ------> 3 e
-
+ Al
3+
(aq)
Al
3+
(aq) + 3 e
-
------> Al(s)
5
According to the Standard Electrode Potential Table, the standard reference half-cell is
F
2
(g) + 2 e
-
-----> 2 F
-
(aq)
2 H
+
(aq) + 2 e
-
-----> H
2
(g)
Ag
+
(aq) + e
-
----> Ag(s)
Fe
2+
(aq) + 2 e
-
---> Fe(s)
6
Where does reduction occur in an electrolytic cell?
at the cathode
in a salt bridge
at the anode
in a porous cup
7
Which of the following statements is true for all electrolytic cells?
1. Oxidation takes place at the cathode.
2. Oxidation takes place at the anode.
3. Reduction takes place at the anode.
4. Reduction takes place at the cathode.
1 and 3
2 and 4
1 and 2
2 and 3
8
How many hours would it take to produce 5.40 g of aluminum from molten bauxite using 5.00 A?
1.07 h
2.14 h
3.22 h
6.43 h
9
What mass of aluminum is deposited during the electrolysis of molten aluminum bromide if 30.0 A flow through the cell for 4.85 h?
146 g
48.8 g
1.46 g
0.0351 g
10
When a 7.3 g sample of bronze was analyzed by electrolysis, it was found to contain 5.00% zinc by mass. If the electrolysis took 30.0 min, the current used was
0.15 A
0.60 A
8.2 A
36 a
11
Use the following half-reactions to answer this question.
2A
+
(aq) + Mg(s) ------> Mg
2+
(aq) + 2A(s) E
o
= 2.60 V
B(s) + Cd
2+
(aq) ------> Cd(s) + B
2+
(aq) E
o
= 0.63 V
What is E
o
for the reaction 2A
+
(aq) + B(s) ------> 2A(s) + B
2+
(aq)?
3.23 V
1.97 V
1.26 V
0.80 V
12
If the reduction of iodine had been selected as the standard half-reaction, then the E
o
value for the reduction of PbSO
4
(s) would be
-0.90 V
-0.18 V
+0.18 V
+0.90 V