July 21: Phase Change

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What defines a physical change in matter?

• A change in chemical composition.

• A change in size, form, or shape without altering chemical composition.

• The formation of new substances.

• A process that is always irreversible.

Which physical change involves a substance transforming from a liquid to a gas?

• Condensation

• Melting

• Evaporation

• Freezing

What process explains the formation of water droplets on the outside of a cold glass?

• Evaporation

• Melting

• Condensation

• Sublimation

Which pair of physical changes are opposite processes?

• Evaporation and Sublimation

• Melting and Freezing

• Condensation and Melting

• Freezing and Evaporation

What is the process where a solid changes directly into a gas without passing through a liquid phase?

• Evaporation

• Condensation

• Melting

• Sublimation