Chemical vs. Physical Changes

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new substances. Examples include burning, rusting, and cooking.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without changing its chemical composition. Examples include melting, freezing, and dissolving.

Front

When something burns, is it a chemical or physical change?

Back

It is a chemical change.

Front

What happens to the gas when a physical change occurs?

Back

The same gas is present before and after the change.

Front

What are changes between states of matter?

Back

Changes between states of matter, like solid to liquid or liquid to gas, are often physical changes.

Front

What caused the candles to go out when blown on?

Back

The carbon dioxide from the breath caused the candles to go out.

Front

Is mixing air into egg whites a physical or chemical change?

Back

It is a physical change.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

Can a physical change be reversed?

Back

Yes, many physical changes can be reversed, like freezing and melting.