C2 Ch. 14 Practice Test
Date:
Name:
1.
6.
Which statement correctly describes both gases and liquids?
A.
Their shapes stay the same in any container.
B.
Their shapes change when they are in di erent containers.
C.
Their volumes stay the same in any container.
Alex placed a small beaker of cold water on a hot plate and heated it
for 10 minutes. He took the temperature of the water several times
during those 10 minutes and recorded his data. Alex claims that the
graph below shows the relationship between temperature and time
when water is heated.
D. Their volumes change when they are in di erent containers.
2.
On a warm sunny afternoon, ocean water splashed onto a rock. A
short time later, the rock was dry. Which statement best explains
what happened to the water on the rock?
A.
Heat caused the water to become a gas.
B.
Heat melted the water and it disappeared.
C.
Salt caused the water to become a gas.
D. Salt melted the water and it disappeared.
3.
A.
4.
Which statement best explains why the temperature leveled o
section 2 of the graph?
Four materials are put into small containers. These materials are
then moved from the small containers into larger containers. Which
material will spread out to completely ll a larger container?
air
B.
ice
C.
sand
D. water
A glass of ice water is placed on a table. After 10 minutes, there are
drops of water on the outside surface of the glass. Which change in
phase caused the drops of water?
A.
Liquid water in the air evaporated into a gas.
B.
Liquid water in the air condensed into a solid.
C.
Water vapor from the air evaporated into a liquid.
7.
Bromine (Br) is a liquid at room temperature. Oxygen (O) is a gas at
room temperature. Room temperature is 25 C.
The boiling point of oxygen is colder than room temperature.
B.
The boiling point of bromine is colder than room temperature.
C.
The melting point of oxygen is warmer than room temperature.
Alex turned o the hot plate so the water did not get any warmer.
B.
The water reached the boiling point, so the temperature no longer
increased.
C.
An experimental error caused the graph to level o , because the
water temperature should keep increasing over time.
As a sample of water turns to ice,
A.
new molecules are formed.
B.
the mass of the sample is increased.
C.
the arrangement of the molecules changes.
D. energy is absorbed by the molecules.
Which of the following statements is true?
A.
A.
D. Cold water heats faster than warm water, so once the cold water
was room temperature, it took more than 10 minutes to make it
hot.
D. Water vapor from the air condensed into a liquid.
5.
in
8.
A container is lled with 100 mL of liquid and placed in a freezer.
The liquid in the container freezes at 0 C . A second container lled
with 120 mL of the same liquid and placed in the freezer.
At what temperature will the liquid in the second container freeze?
D. The melting point of bromine is warmer than room temperature.
A.
page 1
10 C
B.
1 C
C.
0 C
D. 10 C
9.
When water changes from solid to liquid to gas, which statement is
true?
14.
A.
The mass (amount) stays the same.
A.
Solid: Particles have no motion.
B.
The temperature goes down.
B.
C.
The temperature stays the same.
Liquid: Particles expand to ll any container in which they are
placed.
C.
Gas: Particles have higher amounts of energy than when in the
liquid phase.
D. The mass (amount) is greater.
10.
11.
D. Liquid: Particles are more strongly attached to one another than
when in the solid phase.
When Jake breathes out on a cold day, a cloud is formed. Which
change occurs that lets Jake see his breath as a cloud?
A.
Gas changes to liquid.
B.
C.
Liquid changes to gas.
D. Liquid changes to solid.
15.
Solid changes to gas.
In which example is matter changing state?
A.
The molecules move more freely.
A.
heating a pan of water until the water is all gone
B.
The molecules lose electrical charge.
B.
putting a soft drink can in the refrigerator to cool it
C.
The molecules break apart into atoms.
C.
heating soup on the stove until it is hot to your tongue
D. The molecules become xed in a crystal structure.
16.
Chris left a glass of water on a windowsill. When he looked at the
glass a few days later, some of the water had evaporated.
Which of the following best describes what happened to the particles
of water that evaporated?
A.
They became larger in size.
B.
They spread out into the air.
C.
They were absorbed by the glass.
17.
In a laboratory, a sealed container with 100 g of steam is cooled until
all the steam becomes a liquid. The container is then cooled further
until all the water becomes a solid.
Which of the following remains constant during both of these
changes?
A.
the mass of the water
B.
the pressure in the container
C.
the total energy of the water
Which of the following statements best explains why ice
water?
93 C
oats on
A.
Water has a higher speci c heat than ice.
B.
Ice has the same molecular mass as water.
C.
Heat is absorbed when water changes from the solid state to the
liquid state.
D. Hydrogen bonding causes water to be less dense in the solid state
than in the liquid state.
D. They passed through the glass into the air.
13.
Formaldehyde in solution is used as a preservative. It has a melting
point of 92 C.
When the temperature of a sample of formaldehyde rises from
to 91 C, which of the following occurs?
D. transferring sugar into a storage container
12.
Which of the following correctly pairs a phase of matter with its
description?
Which of the following statements best explains why water vapor
condenses as temperature decreases?
A.
Collisions between water vapor molecules become elastic.
B.
Water vapor molecules chemically react when they collide.
C.
Water vapor molecules are pulled together by the force of gravity.
D. Attractive forces between water vapor molecules overcome
molecular motion.
18.
D. the position of the atoms in the container
What happens to the water (H2 O) molecules as a pan of water is
heated from 20 C to 75 C?
A.
The motion of the water molecules increases.
B.
The motion of the water molecules decreases.
C.
The bonds between the hydrogen and oxygen atoms break.
D. The bonds between the hydrogen and oxygen atoms become less
polar.
page 2
C2 Ch. 14 Practice Test
19.
This graph represents a phase diagram for a substance.
21.
Use the information below to answer the following question.
The following graph shows the change in temperature of a sample of
H2 O, which begins as ice, as thermal energy is added.
Which region of the graph represents water H2 O in the liquid form
only?
A.
What is the state of the substance at point I?
20.
A.
gas
B.
C.
liquid and gas
D. solid and liquid
22.
liquid
23.
24.
B.
2
C.
3
D. 4
When the vapor pressure of a liquid in an open container equals the
atmospheric pressure, the liquid will
A.
Popcorn kernels contain a solid material called starch and a small
amount of water at room temperature. When the temperature of the
kernels of popcorn increase, they explode or pop.
1
freeze
B.
crystallize
C.
melt
D. boil
In a closed system, as the temperature of a liquid increases, the vapor
pressure of the liquid
A.
decreases
B.
C.
remains the same
increases
The chart given shows the change in vapor pressure of four pure
liquids with increasing temperature. Which liquid has the lowest
normal boiling point?
Which change in the state of the water takes place inside the kernel,
causing the volume to increase?
A.
solid ! gas
B.
liquid ! gas
C.
solid ! liquid
D. liquid ! solid
A.
page 3
A
B.
B
C.
C
D. D
C2 Ch. 14 Practice Test
25.
Base your answer to the following question(s) on the graph shown,
which represents uniform cooling of a sample of a pure substance,
starting as a gas.
27.
Solid and liquid phases can exist in equilibrium between points
A.
26.
E and F
B.
B and C
C.
C and D
decreases
C.
remains the same
B.
A.
amount of vapor in the container
B.
amount of liquid in the container
C.
temperature of liquid A
D. size of the con ning container
D. D and E
28.
As the temperature of a liquid increases, its vapor pressure
A.
Liquid A is con ned in a container as shown in the diagram. The
equilibrium vapor pressure of liquid A depends on the
increases
29.
page 4
As the pressure on a liquid is changed from 700 torr to 800 torr, the
temperature at which the liquid will boil
A.
decreases
C.
remains the same
B.
increases
As water in a sealed container is cooled from 20 C to 10 C, its
vapor pressure
A.
decreases
C.
remains the same
B.
increases
C2 Ch. 14 Practice Test
30.
Time
(minutes)
Temperature
( C)
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
70
63
57
54
53
53
53
53
53
52
51
48
A student obtained the data shown while cooling a substance. The substance was originally in the liquid phase at a temperature below its boiling point.
What is the freezing point of the substance?
A.
31.
33.
B.
59 C
C.
What is the vapor pressure of a liquid at its normal boiling
temperature?
A.
32.
70 C
1 atm
B.
2 atm
C.
273 atm
36.
53 C
The graph shown represents changes of state for an unknown
substance. What is the boiling temperature of the substance?
D. 760 atm
Which sample of water will have the highest vapor pressure?
A.
10.0 mL at 62 C
B.
20.0 mL at 52 C
C.
30.0 mL at 42 C
D. 40.0 mL at 32 C
The accompanying graph shows the relationship between vapor
pressure and temperature for substance X.
A.
37.
38.
What is the normal boiling point for substance X?
A.
35.
50 C
B.
20 C
C.
30 C
D. 40 C
39.
As the pressure on the surface of a liquid decreases, the temperature
at which the liquid will boil
A.
decreases
C.
remains the same
B.
0 C
B.
20 C
C.
70 C
D. 40 C
Which type of solid does pure water form when it freezes?
A.
34.
D. 48 C
ionic
B.
network
C.
metallic
D. molecular
As the atmospheric pressure increases, the temperature at which water
in an open container will boil
A.
decreases
B.
C.
remains the same
increases
What is the total number of kilocalories of heat needed to change
150 grams of ice to water at 0 C? (Heat of fusion = 80 cal=g)
A.
12
B.
2.0
C.
70
D. 230
increases
The energy required to change a unit mass of a solid to a liquid at
constant temperature is called its heat of
A.
formation
B.
vaporization
C.
combustion
D. fusion
page 5
C2 Ch. 14 Practice Test
40.
The graph shown represents the relationship between temperature and
time as heat was added uniformly to a substance, starting as a solid
below its melting point. During the BC portion of the curve, the
average kinetic energy of the molecules of the substance
47.
Which of the following solids has the highest melting point?
A.
48.
49.
increases and the potential energy increases
B.
decreases and the potential energy increases
C.
remains the same and the potential energy increases
41.
Which of the following compounds has the highest normal boiling
point?
A.
42.
H2 O(`)
B.
H2 S(`)
C.
H2 Se(`)
D. H2 Te(`)
melting
B.
freezing
C.
condensing
D. subliming
51.
52.
53.
AB
B.
BC
C.
CD
D. DE
45.
46.
hydrogen bond
B.
C.
molecule-ion
D. van der Waals
D. CO2 (s)
H2 O
B.
H2 S
C.
H2 Se
D. H2 Te
He
B.
O2
C.
CH4
D. NH3
A.
Chlorine molecules have weak covalent bonds.
B.
Chlorine molecules have strong covalent bonds.
C.
Chlorine molecules have weak inter-molecular forces of attraction.
Based on bond type, which compound has the highest melting point?
CH3 OH
B.
C6 H14
C.
CaCl2
D. CCl4
A gas changes directly to a solid during
A.
fusion
B.
deposition
C.
saponi cation
D. decomposition
Base your answer(s) to the following question(s) on the information
below.
A substance is a solid at 15 C. A student heated a
sample of the solid substance and recorded the temperature at
one-minute intervals in the data table below.
44. Given the phase change: H2 (g) ! H2 (`). Which kind of force acts
between molecules of H2 during this phase change?
A.
SO2 (s)
Which statement explains why low temperature and high pressure are
required to liquefy chlorine gas?
A.
The graph shown represents the uniform heating of a solid, starting
below its melting point. Which portion of the graph shows the solid
and liquid phases of the substance existing in equilibrium?
A.
C.
D. Chlorine molecules have strong inter-molecular forces of
attraction.
In the change represented by the equation CO2 (s) ! CO2 (g), the
CO2 (s) is
A.
43.
50.
Na2 O(s)
Based on intermolecular forces, which of these substances would have
the highest boiling point?
A.
D. remains the same and the potential energy decreases
B.
Which of the following compounds has the highest boiling point?
A.
A.
H2 O(s)
ionic bond
Time (min)
0
1
Temperature ( C)
15
32
2
3
4
5
6
46 53 53 53 53
7
8
9
10
53 53 53 53
11
12
60 65
Based on the data table, what is the melting point of this substance?
At which point do a liquid and a solid exist at equilibrium?
A.
sublimation point
B.
vaporization point
C.
boiling point
D. melting point
Which compound has a high melting point?
A.
SiO2
B.
CO2
C.
SO2
D. NO2
page 6
C2 Ch. 14 Practice Test
54.
Base your answer(s) to the following question(s) on the graph below,
which represents the cooling of a substance starting at a temperature
above its boiling point.
55.
Base your answers to the following question(s) on the information
below.
Starting as a gas at 206 C, a sample of a substance is
allowed to cool for 16 minutes. This process is represented by
the cooling curve below.
What is the melting point of this substance?
At what time do the particles of this sample have the lowest average
kinetic energy?
page 7
C2 Ch. 14 Practice Test