Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

Front

What happens to thermal energy when a liquid freezes?

Back

Thermal energy is removed when a liquid freezes.

Front

What happens to thermal energy when a liquid boils?

Back

Thermal energy is added when a liquid boils.

Front

What state of matter has a definite shape and volume?

Back

Solid.

Front

What state of matter takes the shape of its container but has a definite volume?

Back

Liquid.

Front

What state of matter has no definite shape or volume?

Back

Gas.

Front

What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide.

Front

Why is melting ice considered a physical change?

Back

Because nothing new is created; it is just a change in the state of matter.

Front

What is an example of a chemical change?

Back

Burning wood, which produces ash and smoke.