Chemical and Physical 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, or gas production.

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 or shape.

Front

Give an example of a chemical change.

Back

A rotting potato gives off a bad smell.

Front

Give an example of a physical change.

Back

Sugar dissolving in water.

Front

What happens to the chemical composition during a chemical change?

Back

The chemical composition changes as new substances are formed.

Front

What happens to the chemical composition during a physical change?

Back

The chemical composition remains the same; only the physical form changes.

Front

Is melting ice a chemical or physical change?

Back

Physical change.

Front

Is tarnishing of copper a chemical or physical change?

Back

Chemical change.

Front

What is an indicator of a chemical change?

Back

Signs include color change, temperature change, gas production, or formation of a precipitate.

Front

What is an indicator of a physical change?

Back

Signs include changes in state (solid, liquid, gas), shape, or size without new substances being formed.