AnswersLA-Chemistry AUnit Test

Unit Test — Unit test Answers

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Liquids and solids are referred to as “condensed phases” because the attractive forces

A
cause molecules to become stationary.
B
leave little space between the molecules.
C
create large spaces between the molecules.
D
that hold the molecules together are negligible.
22
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A group of students are wandering around a room. When their teacher claps, the students sit down wherever they are.This situation best models the formation of which type of solid?

A
an amorphous solid because the particles do not have a regular structure
B
an amorphous solid because the motion of the particles stopped
C
a crystalline solid because the moving particles lock into fixed positions
D
a crystalline solid because the particles have a long-range order
23

Which statement best describes the compressibility of a gas?

A
Increasing the temperature of a gas decreases the pressure.
B
Increasing the temperature of a gas increases the pressure.
C
Increasing the pressure on a gas decreases the volume.
D
Increasing the pressure on a gas increases the volume.
24

Which is an example of the kinetic-molecular theory not holding true for a gas?

A
The average kinetic energy of particles depends only on the temperature.
B
The particles in a gas travel in straight lines in a continuous, random motion.
C
The attraction between particles causes a gas to condense at low temperatures.
D
The particles in a gas make up a small portion of the total volume of the gas.
25

What is produced on the top of a pool of water by the mutual attraction between water molecules?

A
surfactant
B
surface tension
C
a much smaller volume
D
a much higher density

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