Chemistry Gas Laws
Name:
1.
Date:
Bromine (Br) is a liquid at room temperature.
Oxygen (O) is a gas at room temperature. Room
temperature is 25 C.
2.
Which of the following statements is true?
A.
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 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. The melting point of bromine is warmer than
room temperature.
Which statement best explains why the temperature
leveled o in section 2 of the graph?
A.
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.
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.
page1
Water, Water Everywhere
Students in a science class were studying the chemical and physical properties of water.
One group of students took a block of ice at 20 C and heated it at a steady rate for 60 minutes. The graph below
shows the temperature changes over that time period.
page2
Chemistry Gas Laws
3.
Which of the following happened between 50 and
60 minutes?
6.
A.
Solid water is changed into liquid water.
A.
It will begin to boil.
B.
Liquid water is changed into water vapor.
B.
It will become a solid.
C.
Solid water is changed into oxygen and
hydrogen gas.
C.
It will turn into a gas.
D. It will increase in weight.
D. Liquid water is changed into oxygen and
hydrogen gas.
4.
If enough heat is taken away from a container of
water, what will happen to the water?
7.
Common kitchen appliances include electric stoves,
toasters and blenders. Each appliance uses an
energy source and involves energy changes to
prepare food.
The picture below shows the Sun shining on an
open jar with some water in it.
An open pot of water is heated on the stove. As
water boils, the molecules
.
A.
move slower and closer together
B.
move faster and farther apart.
C.
get larger
D. get smaller
Justin put the jar of water on a picnic table outside
in the sunlight. Which of the following pictures
shows what Justin would observe after all of the
water had turned into a gas?
5.
Solids have a de nite shape and volume. This is
because
A.
the molecules in solids move past each other
easily.
B.
the molecules in solids stay in a de nite
location and vibrate.
C.
the molecules in solids move freely in all
directions.
A.
B.
C.
D.
D. the molecules in solids do not move at all.
page3
Chemistry Gas Laws
8.
Delilah put a container of water in the freezer and
left it there overnight. The next morning she saw
that the water in the container had changed to ice.
11.
Which of the following statements best explains
why the water changed to ice?
Which of the following best describes what
happened to the particles of water that evaporated?
A.
The water gained energy.
A.
They became larger in size.
B.
The water absorbed light.
B.
They spread out into the air.
C.
Mass was released from the water.
C.
They were absorbed by the glass.
D. Heat was taken away from the water.
9.
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.
The picture below shows a solid
liquid.
D. They passed through the glass into the air.
12.
oating in a
A pond is pictured below in two di erent seasons.
Which of the following has caused the changes in
the pond from A to B?
Which of the following statements describes one
way that solids are di erent from liquids?
A.
Solids have weight and liquids do not.
B.
Solids take up space and liquids do not.
C.
Solids have a de nite shape and liquids do
not.
The pond water has lost heat energy.
B.
The pond water temperature has increased.
C.
Warm water has risen to the top of the pond.
D. All of the water has evaporated from the
pond.
D. Solids have a de nite volume and liquids do
not.
10.
A.
13.
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 changes is caused by
removing heat?
Which of the following remains constant during
both of these changes?
A.
A solid changes to a gas.
A.
the mass of the water
B.
A liquid changes to a gas.
B.
the pressure in the container
C.
A solid changes to a liquid.
C.
the total energy of the water
D. A liquid changes to a solid.
D. the position of the atoms in the container
page4
Chemistry Gas Laws
14.
15.
16.
Which of the following is an example of a physical
change?
A.
lighting a match
B.
C.
burning of gasoline
D. rusting of iron
breaking a glass
If 1 kg of the compound toluene melts at
then 500 g of toluene will
A.
melt at
47.5 C.
C.
boil at 95 C.
B.
18.
melt at
95 C,
A.
B.
C.
D.
95 C.
D. boil at 47.5 C.
Which of the following is an example of a physical
change but not a chemical change?
A.
A log gives o
B.
A tree stores energy from the Sun in its fruit.
C.
A penny lost in the grass slowly changes
color.
19.
heat and light as it burns.
D. A water pipe freezes and cracks on a cold
night.
17.
Which of the following graphs shows how the
rate of evaporation changes with changes in water
temperature?
During which of the following processes is there a
decrease in the heat content of the form of water
indicated?
A.
Ice as it forms on a lake
B.
Water droplets as they fall to the ground
C.
Water as it evaporates from a pond
D. Snow as it melts on a mountainside
Which glass contains only a gas?
A.
B.
20.
C.
D.
page5
When the temperature of a sample of water is
5 C, the water is
A.
a gas.
B.
a liquid.
C.
a solid.
D. a vapor.
Chemistry Gas Laws
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Chemistry Gas Laws
1.
Answer:
A
2.
Answer:
B
3.
Answer:
B
4.
Answer:
B
5.
Answer:
B
6.
Answer:
B
7.
Answer:
B
8.
Answer:
D
9.
Answer:
C
10.
Answer:
D
11.
Answer:
B
12.
Answer:
A
13.
Answer:
A
14.
Answer:
B
15.
Answer:
B
16.
Answer:
D
17.
Answer:
C
18.
19.
20.
Answer:
C
04/16/2013