True/False
Indicate whether the
sentence or statement is true or false.
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1. |
Oxidation corresponds to an increase in oxidation number.
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2. |
Reduction is a process in which electrons are lost or donated by
an atom or ion in a redox reaction.
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3. |
An
oxidizing agent gains electrons and one of its atoms decreases in oxidation
number.
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4. |
The
strongest oxidizing agent in a galvanic cell is above the strongest
reducing agent in the redox table, producing a cell potential that is
negative.
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5. |
The
cathode of a cell is the electrode where electrons are lost or given
up by the reducing agent.
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6. |
Only
the cell potential can be experimentally measured and a reference half-cell,
assigned a zero value, is necessary to calculate reduction potentials.
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7. |
The
cell potential of a standard lead-nickel cell is –0.39 V.
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8. |
Corrosion is an electrochemical process in which electrons are
transferred.
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9. |
The
development of electric cars is closely related to advances in the hydrogen
fuel cell.
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Multiple Choice
Identify
the letter of the choice that best completes the statement or answers
the question.
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10. |
A
reducing agent can be described as a substance that
a. |
loses
electrons and causes reduction. |
b. |
loses electrons and becomes reduced. |
c. |
gains
electrons and causes oxidation. |
d. |
gains electrons and becomes reduced. |
e. |
gains
electrons and becomes oxidized. |
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11. |
Which
of the following solutions should not be stored in a tin-plated
container?
I
NaNO3(aq) III
SnBr2(aq)
II
AgNO3(aq) IV
Cl2(aq)
a. |
I only |
b. |
II,
III, IV |
c. |
II
and III |
d. |
II
and IV |
e. |
III
and IV |
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12. |
The
oxidation number of the carbon atom in the carbonate ion is
a. |
+8 |
b. |
+6 |
c. |
+4 |
d. |
+2 |
e. |
0 |
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13. |
In
a galvanic cell,
a. |
electrons
are provided by the reducing agent at the negative electrode. |
b. |
electrons
are gained by the oxidizing agent at the negative electrode. |
c. |
electrons
flow through the solution from the anode to the cathode. |
d. |
electrons
flow through the solution from the cathode to the anode. |
e. |
electrons
flow through the porous barrier from the cathode to the anode. |
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14. |
A
porous boundary, or a salt bridge, is required in a standard cell to
a. |
conduct
electrons from the anode to the cathode. |
b. |
transfer ions between the half-cells. |
c. |
keep
the electrodes from contacting. |
d. |
maintain standard conditions in both half
cells. |
e. |
stop current flow when electrodes are connected. |
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15. |
If
the electrodes of a standard copper-silver cell are connected with a
wire,
a. |
silver
is plated at the anode. |
b. |
a voltmeter would show a reading of 1.14
V. |
c. |
electrons
flow from the silver to copper electrodes. |
d. |
the solution at the anode becomes darker
blue. |
e. |
the silver ion concentration increases. |
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16. |
The
standard hydrogen half-cell can be represented as
a. |
Pt(s) | H2(g) |
b. |
Pt(s)
| H+(aq) |
c. |
Pt(s) | H2(g), H+(aq) |
d. |
Pt(s) | H2(g) || H+(aq) |
e. |
Pt(s) | H2(g) || H+(aq),
OH (aq) |
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17. |
The
corrosion of iron is accelerated by
a. |
low humidity. |
b. |
lack
of oxygen. |
c. |
low temperature. |
d. |
nonelectrolytes. |
e. |
low pH. |
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18. |
Cathodic protection of iron is effective because the iron
a. |
is
forced to become the anode of a cell. |
b. |
is forced to become the cathode of a cell. |
c. |
is no longer a part of any electrochemical
cell. |
d. |
is attached to the positive terminal of
a battery. |
e. |
is electrically prevented from gaining electrons. |
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