Chemistry
Raymond Chang
10th edition
Chapter 4
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Question 11
When calcium carbonate is placed in water,
which of the following best describes what
is present in the mixture?
A) calcium carbonate molecules only
B) calcium ions and carbonate ions only
C) mostly calcium ions and carbonate ions and
little undissociated calcium carbonate
D) a few calcium ions and carbonate ions and a
lot of undissociated calcium carbonate
E) hydrated calcium and carbonate ions only
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Question 14
The equation Fe3+(aq) + 3OH-(aq) → Fe(OH)3
represents
A) a balanced molecular equation.
B) a balanced ionic equation.
C) a balanced net ionic equation.
D) a dissociation reaction.
E) an example of a redox reaction.
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Question 16
Which of the following species should be
considered a weak Bronsted acid?
A) HI
B) OHC) HNO3
D) HClO4
E) None of the above
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Question 18
In which of the following species is the
oxidation number of manganese highest?
38%
A) MnO2
B) Mn2(SO4)3
C) K2MnO4
D) KMnO4
E) MnO3
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Question 19
Which of the following equations does not
represent a redox reaction?
A) Cu + 2AgNO3 → 2Ag + Cu(NO3)2
B) 2CrO42- + 2H+ → Cr2O72- + H2O
31%
C) 2SO2 + O2 → 2SO3
D) 2H2 + O2 → 2H2O
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19%
E) All are redox
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Question 20
A sample of oxalic acid (a diprotic acid of the formula
H2C2O4) is dissolved in enough water to make 1.00 L
of solution. A 100.0 mL sample of this solution is
titrated with a solution of sodium hydroxide of
concentration 0.750 M and requires 20.0 mL of
sodium hydroxide to reach the end point. Calculate
the mass of the original oxalic acid sample.
A) 6.75 g
B) 0.675 g
C) 1.35 g
D) 13.5 g
E) None of the above
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23.48mL of a NaOH solution are needed to neutralize 0.5468g of
KHP (MW 204.2 g/mol). What is the concentration of the base
solution?
1.
2.
3.
4.
0.1141M
0.002678M
1.14M
Can’t tell
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Answer Key – Chapter 4
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D
D
B
A
A
C
D
D
B
B
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20.
D
A
C
C
A
B
E
D
B
A