Chemical vs. Physical Changes

Front

What is a physical change?

Back

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

Front

What is a chemical change?

Back

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

Front

What happens to the state of matter during a physical change?

Back

The state of matter can change (like solid to liquid) but the substance remains the same.

Front

What is an example of a physical change?

Back

Melting ice into water.

Front

What is an example of a chemical change?

Back

Burning wood.

Front

What is the flame test used for?

Back

To identify the presence of certain gases, like hydrogen.

Front

What happens when hydrogen gas is ignited?

Back

It produces a 'pop' sound.

Front

What is the difference between a physical change and a chemical change?

Back

Physical changes do not create new substances, while chemical changes do.

Front

Can a physical change be reversed?

Back

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

Front

Can a chemical change be reversed?

Back

Most chemical changes cannot be easily reversed.