Understanding Freezing and Melting

What happens to a liquid when it reaches its freezing point?

• It turns into a solid.

• It remains unchanged.

• It becomes a gas.

• It evaporates.

Which of the following is an example of a substance that hardens when frozen?

• Water

• Bread

• Ice cream

• Salt

What is the opposite process of freezing?

• Sublimation

• Boiling

• Condensation

• Melting

Why might rain turn into sleet or snow?

• Due to very cold temperatures

• Because of high humidity

• Due to low pressure

• Because of strong winds

Why do saltwater and freshwater freeze at different temperatures?

• Freshwater is more abundant.

• Saltwater is denser than freshwater.

• Saltwater is warmer than freshwater.

• Saltwater contains impurities that lower its freezing point.