AnswersChemistryStates and Changes of Matter

Practice Test Answers

10 verified answers
1
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Which best characterizes a crystal?

A
a loose association of particles moving past one another
B
a number of high speed particles moving randomly
C
a high-energy state of matter made up of a swirling, ionized gas
D
a dense substance that is hard and incompressible
2
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Which statement describes effusion?

A
It occurs when a liquid passes through a tiny hole.
B
It occurs when gas molecules disperse throughout a container.
C
It occurs when a gas passes through a tiny hole.
D
It occurs when a liquid disperses throughout a container.
3

When a strip of magnesium metal is touched to a flame, a bright light and a whitish substance are produced. Why is the burning of magnesium considered a chemical change?

A
because the metal reaches a high temperature
B
because the metal is malleable
C
because the metal begins to melt
D
because a new substance is formed
4

Which statement describes an extensive property of matter?

A
It changes with the amount of sample that is present.
B
It changes with the composition of a substance.
C
It changes when a new substance is formed.
D
It changes with the color of a substance.
5

Which is a postulate of the kinetic-molecular theory?

A
Gas particles have a small volume relative to the spaces between them.
B
Gas particles are very large in size and always move slowly.
C
Gas particles have a large volume relative to the spaces between them.
D
Gas particles are very small in size and always move slowly.
6

When the process of condensation occurs, the kinetic energy of particles

A
is insufficient to overcome intermolecular forces.
B
easily overcomes the intermolecular forces.
C
becomes exactly equal to the intermolecular forces.
D
becomes independent of temperature.
7

Which term best describes liquid behavior under pressure?

A
incompressible
B
compressed
C
surfactant
D
immiscible
8

Why do amorphous solids not have a long-range order in the arrangement of their particles?

A
Their particles eventually change positions.
B
They do not have enough particles.
C
Their formation involves very rapid cooling.
D
Their particles always stay in the same positions.
9

Which best describes the process that arrow 1 represents?

A
Molecules are slowing down during condensing.
B
Molecules are speeding up during boiling.
C
Molecules are moving from stationary positions.
D
Molecules are depositing as ice on a surface.
10

The gas and liquid are at

A
zero vapor pressure.
B
a low vapor pressure.
C
equilibrium.
D
a high vapor pressure.

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