CHAPTER 10
1.
Which one of the following will not combine with oxygen?
a. nitrogen
b. aluminum
c. hydrogen
d. helium
ANS: d
2.
+
In the equation 2 Na(s) + Cl2(g) ---> 2 Na + 2 Cl , the oxidizing agent is
a. Na(s)
b. Cl2(g)
+
c. Na
d. Cl
ANS: b
3.
In the equation SnO2(g) + 2 C(s) ----> Sn(s) + 2 CO(g), what substance is the
reducing agent?
a. SnO2
b. C
c. Sn
d. CO
ANS: b
4.
Free radicals are particles that
a. have an unpaired electron
b. act as oxidizing agents
c. grab another electron from a neighboring molecule
d. all of the above
ANS: d
5.
When a zinc strip is placed in a copper sulfate solution,
a. the copper solution will lose its blue color
b. the zinc will dissolve
c. black crystals of copper atoms appear
d. all of the above occur
ANS: d
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6.
Reducing agents
a. gain electrons and get oxidized
b. lose electrons and get reduced
c. gain electrons and get reduced
d. lose electrons and get oxidized
ANS: d
7.
Antioxidant vitamins
a. react with DNA
b. donate electrons to free radicals
c. are reduced
d. form free radicals in the body
ANS: b
8.
Which is not an example of a primary battery?
a. lead-acid automobile battery
b. alkaline battery
c. mercury battery
d. lithium battery
ANS: a
9.
PbSO4, Pb, and H2SO4 are chemicals in
a. dry cell
b. primary battery
c. salt bridge
d. automobile battery
ANS: d
10.
Which of the following is not a definition of oxidation?
a. loss of electrons
b. loss of hydrogen
c. loss of protons
d. addition of oxygen
ANS: c
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11.
Which of the following is not a definition of reduction?
a. gain of electrons
b. gain of protons
c. gain of hydrogen
d. loss of oxygen
ANS: b
12.
Which equation does not fit the definition of oxidation?
+
–
+
e --------->
Ag
a. Ag
b. C2H6 ---> H2 +
C2H4
CO2
c. C
+
O2 -------->
d. Na
------>
+
Na
+
e
–
ANS: a
13.
Which of the following is a reduction of carbon?
a. C +
2 H2 ------>
CH4
b. C
+
O2
----> CO2
c. 2 C +
O2
--->
2 CO
d. C
2+
---->
4+
C
+
2e
–
ANS: a
14.
Which of the following is not necessary for corrosion of iron?
a. iron
b. water
c. light
d. oxygen
ANS: c
15.
Which of the following might prevent corrosion of iron?
a. a water spray
b. a coating of zinc
c. acid treatments
d. salt solutions
ANS: b
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16.
Charge is transported from place to place in a battery by
a. an anode
b. a cathode
c. the migration of ions
d. an external electrical circuit
ANS: c
17.
A battery which may be recharged is called a(n)
a. primary battery
b. dry cell
c. electroplating cell
d. secondary battery
ANS: d
18.
In a lead storage battery, what lead compound is formed at both the cathode and the
anode during discharge?
a. lead oxide (PbO2)
b. lead chloride (PbCl2)
c. lead sulfate (PbSO4)
d. lead oxide (PbO)
ANS: c
19.
In a fuel cell using oxygen as the oxidizer and hydrogen as the fuel, what is the overall
cell reaction?
a. H2O
------>
H2 + O2
+ O2 ---------> 2 H2O
b. 2 H2
–
–
c. H2O +
4e
--------> 2 H2 +
4 OH
+
–
4H +
4 e -------> 2 H2O
d. O2 +
ANS: b
20.
In the electrolysis reaction, oxidation occurs at which electrode?
148
a.
b.
c.
d.
cathode
anode
both electrodes
neither electrode
ANS: b
21.
Which of the batteries listed below is a reusable battery?
a. dry cell battery
b. mercury battery
c. alkaline battery
d. lead storage battery
ANS: d
22.
Which of the batteries listed below is a primary battery?
a. lithium ion battery
b. alkaline battery
c. Ni-Cad battery
d. lead acid battery
ANS: b
23.
Electrolysis
a. is the process of producing electricity
b. uses electrical energy to produce chemical change
c. is used to reduce aluminum ore to pure metal
d. both a and c
ANS: d
24.
Oxidation always occurs
a. with the loss of electrons
b. with the gain of electrons
c. with the gain of hydrogen
d. only for metal atoms and not ions
ANS: a
25.
Which of the following is a free radical?
149
a.
b.
c.
d.
SO2
SO3
NO
N2O
ANS: c
26.
Which of the following is a free radical?
a. ozone, O3
b. fluorine, F2
c. chlorine, Cl2
d. nitrogen dioxide, NO2
ANS: d
27.
Which of the following is not an antioxidant vitamin?
a. vitamin A
b. vitamin D
c. vitamin C
d. vitamin E
ANS: b
28.
Identify the oxidized species in the following equation 4Al(s) + 3O2(g) ---> 2Al2O3(s)
a. Al(s)
b. O2(g)
3+
c. Al
2d. O
ANS: a
29.
Identify the reduced species in the following equation CH4(g) + 2O2(g) ---> CO2(g) +
2H2O(g)
a. C
b. O2(g)
c. H
d. H2O
ANS: b
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30.
Which molecule would be a good oxidizing agent?
a. H2
b. SO2
c. C
d. H2O2
ANS: d
31.
Which molecule would be a good reducing agent?
a. O2
b. O3
c. H2
d. H2O2
ANS: c
32.
What is a bleaching agent?
a. oxidizes colored chemicals
b. reduces colored chemicals
c. oxidizes bleach
d. removes salts from hard water
ANS: a
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