Physical and Chemical Changes

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances, often accompanied by energy changes, color changes, gas production, or precipitate formation.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition, such as changes in state, shape, or size.

Front

Give an example of a chemical change.

Back

Burning wood, rusting iron, or digesting food.

Front

Give an example of a physical change.

Back

Melting ice, boiling water, or cutting paper.

Front

What is rust?

Back

A chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide.

Front

What happens during digestion?

Back

Food undergoes a chemical change as it is broken down into simpler substances by enzymes.

Front

What is fizzing an indicator of?

Back

Fizzing often indicates a chemical change, typically due to the release of gas.

Front

Is crumpling paper a physical or chemical change?

Back

Crumpling paper is a physical change because the paper's chemical composition remains the same.

Front

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

Back

A physical change alters the form or appearance of a substance without changing its identity, while a chemical change results in the formation of new substances.

Front

What is an example of a physical change that can be reversed?

Back

Freezing and melting water.