Thermal Properties of Matter

Some ice is melting in a glass of water.Which is correct?

• The temperature of the ice increases.

• The internal energy of the ice increases.

• The internal energy of the water increases.

Internal energy of a substance decreases when

• its temperature decreases.

• its temperature increases.

• it is absorbing heat.

While a liquid is boiling, its temperature

• decreases.

• increases.

• remains constant.

During condensation, the gas

• loses heat.

• absorbs heat.

• neither loses nor absorbs heat.

The diagram shows a cooling curve. What state(s) of matter is P-Q?

• solid

• liquid

• liquid and gas

A heating curve is shown. Which process takes place at B-C?

• solidification

• melting

• boiling

When water evaporates,

• more energetic molecules escape from the surface.

• less energetic molecules escape from the surface.

• molecules collide more often.

When a liquid evaporates,

• its temperature increases.

• Its temperature decreases.

• its temperature stays the same.

Which is correct about both boiling and evaporation?

• The liquid absorbs heat to change to gaseous state.

• The liquid temperature remains constant.

• The liquid molecules move faster.

Why does a swimmer feel cold when coming out of the sea?

• Water is a good conductor of heat.

• The water freezes on his skin.

• The water evaporates from his skin.