Understanding Freezing and Phase Changes

What happens to molecules in a substance when it is cooled?

• They evaporate into gas.

• They remain unchanged.

• They slow down and form crystals.

• They speed up and spread out.

At what temperature does water freeze?

• 0 degrees Celsius

• 212 degrees Fahrenheit

• 32 degrees Fahrenheit

• 100 degrees Celsius

Which of the following substances has a freezing point of minus 22 degrees Fahrenheit?

• Mercury

• Water

• Oil

• Alcohol

Why do foods like bread and meat harden in the freezer?

• The food absorbs cold air.

• The air inside the freezer is dry.

• The moisture within the food solidifies.

• The freezer removes all moisture.

What is the reverse process of freezing called?

• Melting

• Evaporation

• Sublimation

• Condensation