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

Can you give an example of a physical change?

Back

Melting ice into water.

Front

What is an example of a chemical change?

Back

Burning wood, which produces ash and smoke.

Front

What happens to gallium when it melts?

Back

It changes from a solid to a liquid but remains gallium.

Front

What is the role of oxygen in burning candles?

Back

Oxygen is needed for the candle to burn; without it, the candle goes out.

Front

What gas is produced when a candle burns?

Back

Carbon dioxide is produced when a candle burns.

Front

What is blending fruits an example of?

Back

A physical change, as the fruits retain their original properties.

Front

What sound does hydrogen make in a flame test?

Back

A pop sound.