Chemical vs. Physical Changes

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances, often with different properties.

Front

What is a physical change?

Back

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

Front

Give an example of a chemical change.

Back

Rust forming on your bike.

Front

Give an example of a physical change.

Back

Rolling a ball of dough into a flat pizza.

Front

What is evidence of a chemical change?

Back

A new substance is formed.

Front

What happens to the properties of substances during a chemical change?

Back

The properties change because new substances are formed.

Front

What happens to the properties of substances during a physical change?

Back

The properties may change, but the substance remains the same.

Front

Are chemical changes reversible?

Back

No, chemical changes are usually irreversible.

Front

Are physical changes reversible?

Back

Yes, many physical changes are reversible.

Front

What is an example of a reversible physical change?

Back

Melting ice and then freezing it again.