Chemistry, The Central Science, 11th edition
Theodore L. Brown, H. Eugene LeMay, Jr.,
Bruce E. Bursten,
and Catherine J. Murphy
Chapter 20
Electrochemistry
Dana & Michelle Chatellier
University of Delaware
© Copyright 2009, Pearson Education
The oxidation state of nitrogen in
the ammonium ion (NH4+) is:
a.
b.
c.
d.
+1
0
–1
–3
The oxidation state of nitrogen in
the ammonium ion (NH4+) is:
a.
b.
c.
d.
+1
0
–1
–3
The oxidation state of
manganese in the
permanganate ion (MnO4-1) is:
a.
b.
c.
d.
–1
+2
+4
+7
The oxidation state of
manganese in the
permanganate ion (MnO4-1) is:
a.
b.
c.
d.
–1
+2
+4
+7
Zn + Cu2+  Zn2+ + Cu
In the reaction above, the
reducing agent is:
a.
b.
c.
d.
Zn
Cu2+
Zn2+
Cu
Zn + Cu2+  Zn2+ + Cu
In the reaction above, the
reducing agent is:
a.
b.
c.
d.
Zn
Cu2+
Zn2+
Cu
A large positive value of the
standard reduction potential
indicates __________ reaction.
a.
b.
c.
d.
an equilibrium
a spontaneous
a nonspontaneous
a very fast
A large positive value of the
standard reduction potential
indicates __________ reaction.
a.
b.
c.
d.
an equilibrium
a spontaneous
a nonspontaneous
a very fast
G = Gibbs free energy. F =
Faraday’s Constant. E = the cell
potential. n = the number of
moles of electrons. The free
energy change, ∆G, equals:
a.
b.
c.
d.
F + nE
F – nE
–nFE
nF – E
G = Gibbs free energy. F =
Faraday’s Constant. E = the cell
potential. n = the number of
moles of electrons. The free
energy change, ∆G, equals:
a.
b.
c.
d.
F + nE
F – nE
–nFE
nF – E
In a concentration cell, the halfreactions occurring at the anode
and the cathode are:
a.
b.
c.
d.
the same.
in equilibrium.
acid-base reactions.
different in color.
In a concentration cell, the halfreactions occurring at the anode
and the cathode are:
a.
b.
c.
d.
the same.
in equilibrium.
acid-base reactions.
different in color.
A cell that uses an external
source of energy to produce an
oxidation-reduction reaction is
called __________ cell.
a.
b.
c.
d.
a galvanic
a voltaic
an electrolytic
a prison
A cell that uses an external
source of energy to produce an
oxidation-reduction reaction is
called __________ cell.
a.
b.
c.
d.
a galvanic
a voltaic
an electrolytic
a prison
Q = charge in coulombs. I =
current in amperes. t = time in
seconds. Which is correct?
a.
b.
c.
d.
Q=I+t
Q=I–t
Q=I/t
Q = It
Q = charge in coulombs. I =
current in amperes. t = time in
seconds. Which is correct?
a.
b.
c.
d.
Q=I+t
Q=I–t
Q=I/t
Q = It
Reduction occurs at the:
a. anode in both galvanic and electrolytic
cells.
b. cathode in both galvanic and
electrolytic cells.
c. anode in galvanic cells and cathode in
electrolytic cells.
d. cathode in galvanic cells and anode in
electrolytic cells.
Reduction occurs at the:
a. anode in both galvanic and electrolytic
cells.
b. cathode in both galvanic and
electrolytic cells.
c. anode in galvanic cells and cathode in
electrolytic cells.
d. cathode in galvanic cells and anode in
electrolytic cells.
Oxidation occurs at the:
a. anode in both galvanic and electrolytic
cells.
b. cathode in both galvanic and
electrolytic cells.
c. anode in galvanic cells and cathode in
electrolytic cells.
d. cathode in galvanic cells and anode in
electrolytic cells.
Oxidation occurs at the:
a. anode in both galvanic and electrolytic
cells.
b. cathode in both galvanic and
electrolytic cells.
c. anode in galvanic cells and cathode in
electrolytic cells.
d. cathode in galvanic cells and anode in
electrolytic cells.