Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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Which
one of the following compounds is a weak electrolyte when dissolved in water? a. | CH3CO2H | b. | NaCH3CO2 | c. | KNO3 | d. | Na2SO4 | e. | sugar | | |
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2.
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What
are the spectator ions in the reaction between nitric acid and sodium hydroxide? a. | Na+,
OH-, H+, and NO3- | b. | H+
and OH- | c. | Na+ and
NO3- | d. | H+ and
NO3- | e. | Na+ and OH- | | |
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3.
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What
is the net ionic equation for the reaction of limestone with a strong acid? a. | Ca(s) + 2
H+(aq) ® Ca2+(aq) + H2(g) | b. | CaO(s) + 2
H+(aq) ® Ca2+(aq) + H2O(ª) | c. | CaCO3(s) + 2 HCl(aq) ®
CaCl2(aq) + H2CO3(aq) | d. | CaCO3(s) + 2 H+(aq) ® Ca2+(aq) +
H2CO3(s) | e. | CaCO3(s) + 2 H+(aq) ®
Ca2+(aq) + CO2(g) + H2O(ª) | | |
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4.
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Write
a balanced equation for the reaction of baking soda, NaHCO3, with hydrochloric
acid. a. | HCl(aq) +
NaHCO3(aq) ® H2CO3(s) + NaCl(aq) | b. | 4 HCl(aq) +
NaHCO3(aq) ® CCl4(aq) + 2H2O(ª) +
NaOH(aq) | c. | HCl(aq) + NaHCO3(aq) ® NaCl(aq) +
H2O(ª) + CO2(g) | d. | HCl(aq) +
NaHCO3(aq) ® NaOH(aq) + HCl(aq) + CO2(g) | e. | 4 HCl(aq) +
NaHCO3(aq) ® CH4(aq) + 2 Cl2(g) + O2(g) +
NaOH(aq) | | |
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5.
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Which
compound is the reducing agent in the reaction below?
I-(aq) + ClO-(aq) ®
IO-(aq) + Cl-(aq) a. | I- | b. | ClO- | c. | H2O | d. | IO- | e. | Cl- | | |
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6.
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What
is the oxidation number of phosphorus in CaHPO4?
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7.
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Classify the reaction below.
FeCl3(aq) + 3 NaOH(aq) ®
Fe(OH)3(s) + 3 NaCl(aq) a. | gas forming | b. | oxidation-reduction | c. | acid-base | d. | precipitation | e. | decomposition | | |
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8.
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If
4.39 g AlCl3 is dissolved in enough water to make exactly 100.0 mL of solution, what is
the molar concentration of chloride ion? a. | 0.0234 M | b. | 0.0934
M | c. | 0.110
M | d. | 0.132
M | e. | 0.988
M | | |
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9.
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Write
a balanced half-reaction for the reduction of NO3-(aq) to NO(g) in an acidic
solution. a. | NO3-(aq) + H+(aq) + e- ® NO(g) +
HO2(aq) | b. | NO3-(aq) + 2 H+(aq) +
e- ® NO(g) + 2 OH-(aq) | c. | NO3-(aq) + 3 e- ® NO(g) + 2
O2(g) | d. | NO3-(aq) + 4 H+(aq) + 3
e- ® NO(g) + 2 H2O(ª) | e. | 2 HNO3(aq) + 6 e- ® NO(g) +
H2(g) + 3 O2(g) | | |
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10.
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Write
a balanced chemical equation for the following reaction in a basic
solution.
H2O2(aq) + Cr(OH)3(s)
®
H2O(ª) + CrO42-(aq)
a. | 2
H2O2(aq) + 3 Cr(OH)3(s) ® H2O(ª) + 3 CrO42-(aq) + 11/2
H+(aq) | b. | 2 H2O2(aq) + Cr(OH)3(s)
®
H2O(ª) + CrO42-(aq) + 2
OH-(aq) | c. | H2O2(aq) + 2 Cr(OH)3(s)
®
H2O(*ª) + 2 CrO42-(aq) + 4 H2O(ª) | d. | 3 H2O2(aq) + 2 Cr(OH)3(s) + 4
OH-(aq) ® 2 CrO42-(aq) + 8 H2O(ª) | e. | 4 H2O2(aq) + 2 Cr(OH)3(s)
® 2
H2O(ª) + 2 CrO42-(aq) + 4
OH-(aq) | | |
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11.
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The
following reaction occurs spontaneously.
2 H+(aq) + Ca(s) ® Ca2+(aq) +
H2(g)
Write the balanced reduction
half-reaction. a. | 2
H+(aq) + 2 e- ® H2(g) | b. | 2
H+(aq) ® H2(g) + 2 e- | c. | H2(g)
® 2
H+(aq) + 2 e- | d. | Ca(s) + 2 e- ®
Ca2+(aq) | e. | Ca(s) ® Ca2+(aq) + 2 e- | | |
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12.
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Write
a balanced chemical equation for the following reaction in an acidic
solution.
Cr2O72-(aq) +
Br-(aq) ® Cr3+(aq) + Br2(aq)
a. | Cr2O72-(aq) + 2 Br-(aq) ® 2
Cr3+(aq) + Br2(aq) | b. | Cr2O72-(aq) + 6
Br-(aq) + 14 H+(aq) ® 3 Br2(aq) + 2 Cr3+(aq) + 7
H2O(l) | c. | Cr2O72-(aq) + 2
Br-(aq) + 14 H+(aq) ® 2 Cr3+(aq) + Br2(aq) + 7
H2O(l) | d. | Cr2O72-(aq) + 2
Br-(aq) + 7 H+(aq) ® 2 Cr3+(aq) + Br2(aq) + 7
OH-(aq) | e. | Cr2O72-(aq) + 6
Br-(aq) + 7 H+(aq) ® 2 Cr3+(aq) + 3 Br2(aq) + 7
OH-(aq) | | |
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13.
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Which
of the following are oxidation-reduction reactions?
1. | Zn(s) + CuSO4(aq) ®
ZnSO4(aq) + Cu(s) | 2. | Pb(ClO4)2(aq) + 2 KI(aq) ®
PbI2(s) + 2 NaClO4(aq) | 3. | CaCO3(s) ® CO2(g) + CaO(s) | | |
a. | 1 only | b. | 2
only | c. | 1 and
2 | d. | 1 and
3 | e. | 2 and
3 | | |
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14.
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If
5.00 mL of 0.314 M KOH is diluted to exactly 125 mL with water, what is the concentration of the
resulting solution? a. | 5.02 ´ 10-4 M | b. | 1.26
´ 10-2
M | c. | 0.127
M | d. | 0.281
M | e. | 7.85
M | | |
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15.
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A
aqueous hydrochloric acid solution has a pH of 4.15. What mass of HCl is present in 1.0 L of this
solution? a. | 7.2 ´ 10-5
g | b. | 2.6 ´ 10-3
g | c. | 0.58
g | d. | 23
g | e. | 150
g | | |
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