AP Chemistry
Chapter 13 Solutions PRACTICE TEST
Name___________________________
Date_________
SECTION I: Multiple Choice (Time: 1.5 minutes allotted per question). Select the best answer for each
question. You need not show any work. Calculators are not permitted on this section of the test.
Practice estimating to find the best answer.
1.
How many milliliters of 13.0 M H2SO4 are needed to prepare 600.0 mL of 0.10 M H2SO4?
a)
0.22 mL
b)
78 mL
c)
4.6 mL
d)
2.3 mL
e)
5.6 mL
Ans: c
Algorithm: Yes
Chapter/Section: 11.1
Difficulty: Easy
Keyword 1: Chemistry
2. What volume of a 0.751 M solution of CaCl2 contains 1.28 g of solute?
a)
65.1 mL
b)
15.4 mL
c)
1.70 mL
d)
8.66 mL
e)
84.6 mL
Ans: b
3.
Difficulty: Easy
Keyword 1: Chemistry
Algorithm: Yes
Chapter/Section: 11.1
Difficulty: Easy
Keyword 1: Chemistry
A 20.0-g sample of methyl alcohol (CH3OH, molar mass = 32.04 g/mol) was dissolved in 35.6 g of water. The
mole fraction of CH3OH is:
a)
0.316
b)
0.624
c)
0.360
d)
4.17
e)
0.240
Ans: e
5.
Chapter/Section: 11.1
A solution containing 406.7 g of Mg(NO3)2 per liter has a density of 1.114 g/mL. The molarity of the solution
is:
a)
2.742 M
b)
2.461 M
c)
8.226 M
d)
3.054 M
e)
none of these
Ans: a
4.
Algorithm: Yes
Algorithm: Yes
Chapter/Section: 11.1
Difficulty: Easy
Rank the following compounds according to increasing solubility in water.
I.
CH3–CH2–CH2–CH3
II.
CH3–CH2–O–CH2–CH3
III.
CH3–CH2–OH
IV.
CH3–OH
Keyword 1: Chemistry
a)
b)
c)
d)
e)
Ans: d
6.
I < III < IV < II
I < II < IV < III
III < IV < II < I
I < II < III < IV
None of these (A-D) is correct.
Algorithm: No
Chapter/Section: 11.2
Difficulty: Easy
Keyword 1: Chemistry
Which statement about hydrogen bonding is true?
a)
Hydrogen bonding is the intermolecular attractive forces between two hydrogen atoms in solution.
b)
The hydrogen bonding capabilities of water molecules cause CH3CH2CH2CH3 to be more soluble in
water than CH3OH.
c)
Hydrogen bonding of solvent molecules with a solute will not affect the solubility of the solute.
d)
Hydrogen bonding interactions between molecules are stronger than the covalent bonds within the
molecule.
e)
Hydrogen bonding arises from the dipole moment created by the unequal sharing of electrons within
certain covalent bonds within a molecule.
Ans: e
Algorithm: No
Chapter/Section: 11.3
Difficulty: Easy
Keyword 1: Chemistry
7.
Solid KF has a lattice energy of 804 kJ/mol and a heat of solution (in water) of –15 kJ/mol. RbF has a lattice
energy of 768 kJ/mol and a heat of solution (in water) of –24 kJ/mol. Which salt forms stronger attractions
with water?
a)
KF, since it has a larger lattice energy.
b)
RbF, since it has a smaller lattice energy.
c)
KF, since it has a more negative heat of hydration.
d)
RbF, since it has a more negative heat of hydration
e)
They form equally strong attractions with water, since they both have negative heats of mixing.
Ans: d
Algorithm: No
Chapter/Section: 11.2
Difficulty: Easy
Keyword 1: Chemistry
8.
The lattice energy of KCl is 701.0 kJ/mol and its heat of solution is 17.2 kJ/mol. Calculate the hydration
energy of KCl(s). (HINT: lattice energy is ΔH1, hydration energy is ΔH3, heat of solution is ΔH)
a)
34.4 kJ/mol
b)
–718.2 kJ/mol
c)
–683.8 kJ/mol
d)
718.2 kJ/mol
e)
683.8 kJ/mol
Ans: c
9.
Algorithm: Yes
Chapter/Section: 11.2
Difficulty: Easy
Keyword 1: Chemistry
Use the following drawing of a gaseous solute in equilibrium with a solution to help answer the question
below.
Which of the following statements are true when the piston is pushed in (downward)?
a)
b)
This will cause the pressure of the gas to increase and the concentration of the dissolved gas to go down.
This will cause the pressure of the gas to decrease and the concentration of the dissolved gas to go
down.
This will cause the pressure of the gas to increase and the concentration of the dissolved gas to go up.
This will cause the volume of the gas to decrease and the concentration of the dissolved gas to go down.
This will cause the volume of the gas to increase and the concentration of the dissolved gas to go up.
c)
d)
e)
Ans: c
10.
Algorithm: No
Chapter/Section: 11.3
Difficulty: Easy
Keyword 1: Chemistry
A correct statement of Henry's law is:
a)
The concentration of a gas in solution is inversely proportional to temperature.
b)
The concentration of a gas in solution is directly proportional to the mole fraction of solvent.
c)
The concentration of a gas in solution is independent of pressure.
d)
The concentration of a gas in a solution is inversely proportional to pressure.
e)
None of these.
Ans: e
Algorithm: No
Chapter/Section: 11.3
Difficulty: Easy
Keyword 1: Chemistry
11. ½ H2 (g) + ½ I2 (s) HI(g) ΔH = 26 kJ/molrxn ½ H2 (g) + ½ I2 (g) HI(g) ΔH = -5.0 kJ/molrxn 64. Based
on the information above, what is the enthalpy change for the sublimation of iodine, represented
below? I2(s) → I2(g) (A) 15 kJ/ molrxn (B) 21 kJ/ molrxn (C) 31 kJ/ molrxn (D) 42 kJ/ molrxn (E) 62 kJ/ molrxn
12.
How many of the following help determine whether or not a solution forms?
I.
the polarities of the solute and solvent
a)
b)
c)
d)
e)
Ans: c
13.
the densities of the solute and solvent
III.
the probability of the mixed state (of the solution)
IV.
the energies needed for the solution formation to occur
V.
the state of matter of the solute (solid, liquid, gas)
1
2
3
4
5
Algorithm: No
Chapter/Section: 11.2
Difficulty: Easy
Keyword 1: Chemistry
For which process is S negative?
a)
evaporation of 1 mol of CCl4(l)
b)
mixing 5 mL ethanol with 25 mL water
c)
compressing 1 mol Ne at constant temperature from 1.5 L to 0.5 L
d)
raising the temperature of 100 g Cu from 275 K to 295 K
e)
grinding a large crystal of KCl to powder
Ans: c
14.
II.
Algorithm: No
Chapter/Section: 17.1
Difficulty: Easy
Which of the following result(s) in an increase in the entropy of the system?
I.
II.
Br2(g)  Br2(l)
Keyword 1: Chemistry
–
NaBr(s)  Na (aq) + Br (aq)
IV.
O2(298 K)  O2(373 K)
V.
NH3(1 atm, 298 K)  NH3(3 atm, 298 K)
a)
b)
c)
d)
e)
Ans: c
15.
+
III.
I
II, V
I, III, IV
I, II, III, IV
I, II, III, V
Algorithm: No
Chapter/Section: 17.1
Difficulty: Easy
Keyword 1: Chemistry
A chemical reaction is most likely to be spontaneous if it is accompanied by
a)
increasing energy and increasing entropy
b)
lowering energy and increasing entropy
c)
increasing energy and decreasing entropy
d)
lowering energy and decreasing entropy
e)
none of these (A-D)
Ans: b
Algorithm: No
Chapter/Section: 17.3
Difficulty: Easy
Keyword 1: Chemistry
SECTION II: Free Response
“Directions: Questions 1–3 are long free-response questions that require about 20 minutes each to
answer and are worth 10 points each. Write your response in the space provided following each
question. Examples and equations may be included in your responses where appropriate. For
calculations, clearly show the method used and the steps involved in arriving at your answers. You must
show your work to receive credit for your answer. Pay attention to significant figures.”