Chemical Equilibrium
Practice Test
1.
Which of the following is the general definition of a liquid?
a.
Matter that has a fixed shape but no fixed volume.
b.
Matter that has a fixed volume but no fixed shape.
c.
Matter that has a fixed volume and a fixed shape.
d.
Matter that has neither a fixed volume nor a fixed shape.
2.
Calculate the number of moles of gas contained in a 16.0-L vessel at 373 K with a pressure of 2.50 atm.
SC.A.1.4.3
a.
1.31 mol
b.
2.8 x 10
-3
mol
c.
1.31 x 10
-1
mol
d.
0.766 mol
3.
The process of a solvent and a solute completely mixing and forming a solution is ________.
a.
salvation
b.
ionization
c.
crystallization
d.
solvation
4.
What is the name given to a chemical produced in one elementary step and used up in a subsequent elementary step?
a.
elementary step
b.
intermediate
c.
complex step
d.
reaction mechanism
5.
What are the individual steps in a complex reaction known as?
a.
intermediate steps
b.
rate-determining steps
c.
complex steps
d.
elementary steps
6.
The Tyndall effect describes ______________.
SC.A.2.4.6
a.
hydrophobic interactions between nonpolar molecules
b.
the adsorption of positive ions onto the surface of a hydrophilic solid
c.
precipitation of colloidal particles using electrically charged plates
d.
the scattering of light by colloidal particles
7.
If 4.27 g sucrose
C
12
H
22
O
11
are dissolved in 15.2 g water, what is the boiling point of the resulting solution? K
b
for water = 0.512°C/
m
.
SC.A.1.4.3
a.
100.42°C
b.
99.626°C
c.
100.73°C
d.
101.64°C
8.
A 10.0-L vessel contains gas A at a pressure of 300.0 torr. A 3.00-L vessel contains gas B at a pressure of 400.0 torr. Gas A is forced into the second vessel. Calculate the resulting pressure in torr. Assume the temperature remains constant.
a.
2000 torr
b.
1000 torr
c.
1800 torr
d.
1400 torr
9.
What mass of Ca
OH
2
is contained in 1500 mL of 0.0250
M
Ca
OH
2
solution?
SC.B.1.4.2
a.
1.85 g
b.
3.17 g
c.
2.34 g
d.
2.78 g
10.
Which of the following is not a colligative property?
a.
boiling point elevation
b.
vapor pressure lowering
c.
increasing solubility
d.
freezing point depression
11.
If 12.0 g of a gas at 2.5 atm dissolve in 1.0 L of water at 25°C, how much will dissolve in 1.0 L of water at STP?
SC.A.1.4.3
a.
0.21 g/L
b.
12.0 g/L
c.
2.1 g/L
d.
4.8 g/L
12.
The molar solubility for BaCO
3
is 9.0 x 10
-5
M
at 25°C. What is the solubility product constant,
K
sp
, for BaCO
3
?
SC.A.1.4.5
a.
4.0 x 10
-15
b.
1.2 x 10
-8
c.
8.1 x 10
-9
d.
5.3 x 10
-12
13.
Which of the solubility product expressions is incorrect?
SC.A.1.4.4
a.
K
sp
CuS
=
Cu
2+
S
2-
b.
K
sp
Sb
2
S
3
=
Sb
2+
3
S
3-
2
c.
K
sp
CaF
2
=
Ca
2+
F
-
2
d.
K
sp
Ag
2
S
=
Ag
+
2
S
2-
14.
Which of the following materials will have the greatest viscosity?
a.
water
b.
air
c.
cooking oil
d.
vinegar
15.
Which of the following would force the forward reaction to completion?
CaCO
3
s
+2H
3
O
+
aq
→ Ca
2+
aq
+3H
2
O
l
+CO
2
g
SC.A.1.4.4
a.
add base to neutralize the H
3
O
+
b.
add more Ca
2+
to the mixture
c.
conduct the experiment in an open container
d.
add CO
2
to the mixture
16.
Calculate the molarity of 0.75 L of a solution containing 0.83 g of dissolved KCl.
a.
6.2
b.
1.1 M
c.
0.75 M
d.
0.015 M
17.
Consider the following reaction in which all reactants and products are gases. 1.00 mole of A and 2.00 moles of B are placed in a 5.0—L container. After equilibrium has been established, 0.50 mole of D is present. What is the equilibrium constant for this reaction: A+ 2B → 2C+D?
SC.B.1.4.2
a.
0.15
b.
3
c.
1
d.
0.33
18.
A colloid contains particles that ____________________.
SC.A.2.4.6
a.
are between 1 nm and 1000 nm in diameter
b.
are smaller than atoms
c.
are atomic-size in scale
d.
settle out if left undisturbed
19.
For the reaction, 2A+B→ C+2Dat 35°C, the value of the forward rate constant,
K
f, is 3.0 × 10
-3
M
-1
s
-1
and the value of the reverse rate constant,
K
r, is 1.5 × 10
-2
M
-2
s
-1
. Calculate the value of
K
eq
for this reaction.
SC.A.1.4.4
a.
0.2
b.
0.5
c.
5
d.
2
20.
For the reaction, H
2
g
+Cl
2
g
→ 2HCl
g
+heat, what will be the effect on the equilibrium constant,
K
eq
, if the pressure of the vessel is decreased at constant temperature?
SC.A.1.4.4
a.
K
eq
increases
b.
The question cannot be answered without knowing the initial value of
K
eq
.
c.
K
eq
does not change
d.
K
eq
decreases
