Pretest Answers

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3

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
4

Why are liquids well suited for hydraulics?

A
Liquids are incompressible.
B
Liquids change volume easily.
C
Liquids have few molecules.
D
Liquids have low densities.
5

Which postulate of the kinetic-molecular theory applies to the particles of a liquid?

A
They can be compressed, which causes a large change in volume.
B
They do not move freely but vibrate in a stationary position.
C
They have enough kinetic energy to easily slide by each other.
D
They have so much kinetic energy that their intermolecular forces are negligible.
7

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

A
cause molecules to become stationary.
B
that hold the molecules together are negligible.
C
leave little space between the molecules.
D
create large spaces between the molecules.
8

Melting can be best described as a process in which molecules

A
lose kinetic energy and remain stationary.
B
lose kinetic energy and move slowly.
C
gain kinetic energy and escape into the atmosphere.
D
gain enough kinetic energy to get past each other.
9

What happens when a solid is dissolved into a liquid?

A
Solid particles sink down toward the bottom layer of liquid particles.
B
Solid particles become suspended in the middle of liquid particles.
C
Solid particles become evenly dispersed among liquid particles.
D
Solid particles float toward the surface layer of liquid particles.

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Pretest Answers — Chemistry