Chemistry
Raymond Chang
10th edition
Exam I review
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Question 2
Which of the following pairs of
substances would be completely soluble
in each other regardless of the
58%
proportions combined?
A) nitrogen gas and
gaseous ammonia
B) sodium chloride
and water
C) gasoline and water
D) all of the above
26%
11%
5%
1
2
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4
Question 3
Which of the following would produce a
25% by mass solution of sodium chloride in
water?
58%
A) 25 g of sodium chloride
dissolved in 100 g of water.
B) 50 g of sodium chloride
dissolved in 200 g of water
C) 25 g of sodium chloride
dissolved in 75 g of water.
D) both A and B.
32%
5%
1
5%
2
3
4
Question 4
The density of water is very close to
1.00 g/mL. If 3.00 moles of ethanol
(molar mass 46 g/mol) is mixed with
1000. g of water, the solution will be
44%
44%
A) 3.00 molar in ethanol.
B) 3.00 molal in ethanol.
C) 3.00% by mass ethanol.
D) all of the above.
11%
0%
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2
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Question 5
Which of the following is true?
A) The solubilities of solids in liquids
always increase with temperature.
B) The solubilities of gases in liquids
always increase with temperature.
C) The solubilities of solids in liquids
rarely increase with temperature.
D) None of the above.
50%
44%
6%
0%
1
2
3
4
Question 6
When a nonvolatile substance is
dissolved in a liquid, the melting point of
the solution will be lower than the
melting point of the pure liquid.
26%
A) True
B) False
74%
1
2
Question 7
The freezing point depression constant is
A) different for different
solutes.
B) different for different
solvents.
C) the same for all polar
solvents.
D) different for different
temperatures.
47%
32%
16%
5%
1
2
3
4
Question 8
When solutions of different concentrations are
separated by a semipermeable membrane that
allows osmosis to occur, then
A) there is a net flow of solvent to the side
of the membrane with lower concentration.
B) there is a net flow of solvent to the side
of the membrane with higher
concentration.
C) there is a net flow of solute to the side
of the membrane with lower concentration.
D) there is a net flow of solute to the side
of the membrane with higher
concentration.
50%
39%
6%
1
6%
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3
4
Question 10
A nonpolar liquid with a density of 0.870
g/mL is mixed in a beaker with water
(density 1.00 g/mL). If the substances do
not react chemically, then it is likely that
A) two phases will form and the
95%
water phase will be on top.
B) two phases will form and the
water phase will be on the bottom.
C) most of the liquid will dissolve in
the water, but some may remain
undissolved.
5%
0%
0%
D) the nonpolar liquid will be
miscible in the water.
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Question 12
Which compound will dissolve better in
water?
33%
28%
28%
A) CO2
B) CS2
C) Br2
D) SO2
11%
1
2
3
4
Question 16
Which NaOH solution is the most concentrated?
(assume a density of 1.00 g/mL wherever
necessary)
39%
A) 10.0 % NaOH
by mass
B) 10.0 M NaOH
C) 10.0 m NaOH
D) They all have
the same concentration
28%
17%
1
17%
2
3
4
Question 17
How would you achieve a high
concentration of CO2 in a soda bottle?
A) Keep the bottle capped
B) Keep the bottle refrigerated
C) Keep the bottle upside down
D) B and C
E) A and B
56%
39%
6%
1
0%
0%
2
3
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5
Question 18
Seawater has an osmotic pressure of
33.0 atm at 25°C. Assuming seawater
only contains disolved NaCl, what mass
of NaCl is contained in 2.00 L of
seawater?
56%
A) 1.23 g
B) 1.23 mol
C) 144 g
D) 72.0 g
E) None of the above
22%
11%
6%
1
2
6%
3
4
5
Question 1
For the reaction 2A + B → C it is found that
changing the concentration of A has no
impact on the rate, but when B is doubled
the rate doubles. The rate law is
50%
44%
A) rate = k[A]2[B].
B) rate = k[A][B]2.
C) rate = k[B]2.
D) none of the above.
6%
0%
1
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Question 3
Which of the following is true?
A) A catalyst is not
consumed in the reaction.
B) A catalyst speeds up
the forward reaction.
C) A catalyst speeds
up the reverse reaction.
D) A catalyst
11%
decreases the activation
5%
energy.
E) All of the above.
1
2
84%
0%
3
0%
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5
Question 4
If a reaction is first order in one reactant
and first order in the only other reactant,
the units of the rate constant would be
65%
A) Ms-1.
B) M-1s.
C) Ms.
D) M-1s-1.
E) none of the above
12%
12%
12%
0%
1
2
3
4
5
Question 6
Using the data below, determine the rate law
for the reaction of A with B to produce C.
Exp 1: 0.100 M A, 0.100 M B, rate 0.120 M/s
Exp 2: 0.100 M A, 0.200 M B, rate 0.120 M/s
Exp 3: 0.200 M A, 0.100 M B, rate 0.480 M/s
94%
A) rate=k[A]2[B]
B) rate=k[A]2
C) rate=k[B]2
D) rate=k[A][B]
6%
0%
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3
0%
4
Question 11
Which of the following can be used to
determine the rate of a chemical reaction?
78%
A) Measuring a change in color
B) Measuring a change in mass
C) Measuring a change in
concentration of a certain species
D) All of the above
E) None of the above
17%
6%
0%
1
0%
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3
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5
Question 15
In the reaction N2 + 3H2 → 2NH3, the
rate of formation of ammonia at a given
moment is 0.060 mol/s. What is the rate
of reaction of hydrogen gas at the same
78%
moment?
A) -0.060 mol/s
B) 0.090 mol/s
C) -0.090 mol/s
D) 0.040 mol/s
E) -0.040 mol/s
6%
1
6%
2
3
6%
6%
4
5
Question 18
Which type of plot will be linear for a second
order reaction?
83%
A) [A] vs time
B) ln[A] vs time
C) 1/[A] vs time
D) [A]2 vs time
E) None is linear
11%
6%
1
2
3
0%
0%
4
5
Question 1
The reaction N2O4(g) ↔ 2NO2(g) is
endothermic. Which of the following is true?
A) Decreasing the pressure
drives the reaction to the right.
B) Increasing the
temperature drives the reaction to
the right.
C) Decreasing the volume
drives the reaction to the left.
D) All of the above.
61%
28%
6%
1
6%
2
3
4
Question 2
If an equilibrium for a reaction is said to lie
to the right then the equilibrium constant
78%
A) is a negative value.
B) is a positive value
less than one.
C) is a positive value
greater than one.
D) is equal to one.
17%
6%
1
0%
2
3
4
Question 13
Which of the following statements is true of
a catalyst?
A) Its concentration stays
constant throughout the reaction
B) it increases the rate of a
reaction
C) it provides a new pathway
for the reaction
D) all of the above
E) none of the above
0%
1
0%
0%
2
3
0%
0%
4
5
Question 14
For reactions in gas phase, a relationship can be
established between Kc and Kp. For which of the
following processes will the two constants have the
same numerical value?
A) formation of water vapor from
hydrogen and oxygen
B) formation of carbon dioxide from
carbon monoxide and oxygen
C) synthesis of ammonia from
hydrogen and nitrogen
D) decomposition of hydrogen iodide
into hydrogen and iodine gas
0%
0%
0%
0%
E) conversion of nitrogen dioxide into
dinitrogen tetroxide
1
2
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4
0%
5
Question 15
Calculate the equilibrium constant for
the process AB, given the following
equilibrium concentrations:
[N2O4] = 0.0427 M ; [NO2] = 0.0141 M
A) 6.60x10-1
B) 215
C) 0.00466
D) 0.330
E) 3.03
0%
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0%
0%
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3
0%
0%
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Question 16
Consider the following reaction:
4HCl(g) + O2(g) ↔ 2H2O(g) + 2Cl2(g)
with DH = -114.4 kJ
One way to decrease the amount of
chlorine present at equilibrium is
A) removing the water vapor while it is
being formed.
B) raising the temperature.
C) adding more hydrogen chloride.
D) decreasing the volume of the
reaction vessel.
E)
none of the above.
0%
1
0%
0%
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3
0%
0%
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Question 19
Consider the following reaction:
CaCO3(s) ↔ CO2(g) + CaO(s) . What will
happen to the system if more CaCO3 is
added?
A) nothing
B) the amount of CaCO3 will
decrease
C) less CaO will be produced
D) the pressure will increase
E) the concentration of CO2 will
0%
0%
0%
0%
decrease
1
2
3
4
0%
5
Question 1
Which is true regarding the equilibrium
below?
HF(g) + H2O(l) ↔ F- + H3O+(aq)
A) HF is acting as a
Bronsted base.
B) Water is acting as a
Bronsted base.
C) The reaction goes to
completion leaving little HF.
D) The Fluoride ion is
acting as Bronsted acid.
0%
1
0%
2
0%
3
0%
4
Question 2
Which of the following is(are) true?
A) pH can never be greater
than 14.
B) pH can never be less
than 0.
C) At room temperature,
pH + pOH = 14.
D) All of the above.
0%
1
0%
2
0%
3
0%
4
Question 3
Which of the following is a neutral salt
(neither acidic nor basic)?
A) KCl
B) NaCN
C) NH4NO3
D) NaF
0%
1
0%
2
0%
3
0%
4
Question 5
Which of the following has an impact on the
percent ionization of a weak acid?
A) The acid ionization constant.
B) The concentration of the acid.
C) Both A and B.
D) None of the above.
0%
1
0%
2
0%
3
0%
4
Question 7
Which of the following will produce a basic
solution when dissolved in water?
A) Na2O
B) NaOH
C) Both A and B
D) None of the above
0%
1
0%
2
0%
3
0%
4
Question 18
What will be the pH of a 1.0 × 10-8 M
solution of HCl?
A) 8.0
B) 6.0
C) cannot be
calculated
D) it will be slightly
less than 7.0
E) it will be slightly
more than 7.0
0%
1
0%
0%
2
3
0%
0%
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