Chemistry
Describing Matter and
Physical and Chemical
Changes
Which activity is an
example of a chemical
change?
1. sugar dissolving in
water
2. water evaporating
in air
3. lighting a match
4. freezing water
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Diamonds are sometimes
used as the tips of drill bits.
Which physical property of a
diamond MOST likely makes
it a good cutting tool?
1. its electrical
properties
2. its thermal
properties
3. its hardness
4. its density
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Which is an example of a
chemical change?
1. heating a block of ice to
form liquid water
2. heating a tungsten wire
until it glows brightly
3. adding sugar crystals to
water to form a clear,
colorless liquid
4. passing an electric
current through water
to form hydrogen and
oxygen
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The diagram shows a tank of fluid
with an ice cube at the bottom.
Which best explains why the ice
cube sank in the liquid?
1. The ice cube is in water.
2. The liquid is less dense
than the ice.
3. The liquid is more dense
than the ice.
4. The ice cube is colder
than the liquid.
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Which of these is a
chemical property of a
material?
1.
2.
3.
4.
density
flammability
color
brittleness
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Students added a small rock to a
graduated cylinder with 16 mL of water.
The water level rose 6 mL.
The student subtracted the two water
levels. Which property of the rock were
the students measuring?
1.
2.
3.
4.
density
area
mass
volume
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John and Lisa collected a sample of ocean
water and placed it in a jar. Within a
couple of days, the water had evaporated
and salt was visible at the bottom of the
jar. This in an example of a
1.
2.
3.
4.
physical change.
chemical change.
solute being dissolved.
new substance being
formed.
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The light and dark circles in the pictures
below represent different types of atoms.
Which picture best represents a pure
compound?
1.
2.
3.
4.
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