Chem ch 10 Test Review

Liquids diffuse more slowly than gases because

• liquid particles are not mobile

• liquids always exist at lower temperatures

• liquids can not be compressed

• attractive forces in liquids restrict movement

According to the kinetic-molecular theory, particles of an ideal gas

• repel each other and collide

• collide but do not attract

• attract each other and collide

• do not collide or attract/repel each other

When heated, a pure crystalline solid will

• gradually soften, then melt

• melt over a wide temperature range

• melt at a temperature slightly above its freezing point

• melt at a defined temperature

As atmospheric pressure increases, a substance's boiling point

• increases

• decreased

• remains unchanged

• shows no correlation

Sublimation involves changing from a

• liquid to a gas

• gas to a solid

• solid to a gas

• gas to a liquid

This occurs in a closed system when opposing changes happen at the same rate.

• equilibrium

• sublimation

• deposition

• fluidity

The force that pulls a liquid's surface together to minimize its surface area is called

• boiling point

• equilibrium

• surface tension

• amorphous

The spontaneous mixing of two fluids is called

• vapor point

• capillary action

• effusion

• diffusion

The movement of gas particles through a small opening is called

• diffusion

• an elastic collision

• effusion

• vaporization

Which shape most minimizes surface area and surface tension?

• sphere

• cube

• cylinder

• pyramid