Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change in which the form or appearance of a substance changes, but its chemical composition remains the same. Examples include melting ice or breaking a glass.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include rusting iron or burning wood.

Front

True or False: Melting is a physical change.

Back

True

Front

True or False: Rusting is a chemical change.

Back

True

Front

What happens to thermal energy when a solid melts?

Back

Thermal energy is added to the solid, causing it to change into a liquid.

Front

What happens to thermal energy when a liquid freezes?

Back

Thermal energy is removed from the liquid, causing it to change into a solid.

Front

What is boiling?

Back

Boiling is the process where a liquid turns into a gas when thermal energy is added.

Front

What is condensation?

Back

Condensation is the process where a gas turns into a liquid when thermal energy is removed.

Front

Give an example of a physical change.

Back

An example of a physical change is chopping wood.

Front

Give an example of a chemical change.

Back

An example of a chemical change is baking a cake.