Changes in Matter Answers

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Which statement describes a physical property of copper?

A
It reacts with strong acids.
B
It can be reshaped by a force.
C
It ignites at high temperatures.
D
It can combine with oxygen.
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Which of these is an extensive property of a substance?

A
color
B
hardness
C
malleability
D
volume
3

Which list includes only physical properties?

A
density, reactivity, and conductivity
B
boiling point, conductivity, and color
C
color, odor, and flammability
D
flammability, reactivity, and ductility
4

A scientist observes that the electrical resistance of a superconducting material drops to zero when the material is cooled to very low temperatures. Which of the following statements best describes what the scientist is observing?

A
The scientist is observing the electrical power of a superconductor.
B
The scientist is observing the temperature of a superconductor.
C
The scientist is observing an intensive property of a superconductor.
D
The scientist is observing an extensive property of a superconductor.
5

Which of these is a chemical property of a substance?

A
texture
B
ductility
C
reactivity
D
conductivity
6

A student performs the following experiment.Step 1: She pours a colorless solution into a beaker that contains another colorless liquid. Yellow particles appear in the liquid.Step 2: She lets the yellow particles settle in the beaker and then separates the colorless liquid by decantation.What has most likely occurred in the beaker?

A
a chemical change in step 1 and a physical change in step 2
B
a physical change in step 1 and a chemical change in step 2
C
chemical changes in both step 1 and step 2
D
physical changes in both step 1 and step 2
7

Which term refers to a property that depends only on the amount of a substance?

A
flammability
B
extensive
C
intensive
D
reactivity
8

The table below shows the freezing points of four substances.SubstanceFreezing point (°C)benzene5.50water0.00butane–138nitrogen–210.The substances are placed in separate containers at room temperature, and each container is gradually cooled. Which of these substances will solidify before the temperature reaches 0°C?

A
benzene
B
water
C
butane
D
nitrogen
9

Which of these is an example of a physical change?

A
a banana ripening in the air
B
hydrogen burning in the air
C
zinc reacting with an acid
D
liquid water turning into vapor
10

Which is an intensive property of a substance?

A
density
B
volume
C
length
D
mass

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