Chemical vs. Physical Changes

Front

What is a physical change?

Back

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

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, involving a rearrangement of atoms.

Front

Give an example of a physical change.

Back

Melting of ice into water.

Front

Give an example of a chemical change.

Back

Rusting of iron.

Front

What happens to the chemical composition during a physical change?

Back

The chemical composition remains the same.

Front

What happens to the chemical composition during a chemical change?

Back

The chemical composition changes, resulting in new substances.

Front

Is boiling water a physical or chemical change?

Back

Boiling water is a physical change.

Front

Is burning wood a physical or chemical change?

Back

Burning wood is a chemical change.

Front

What is an indicator of a chemical change?

Back

Indicators of a chemical change include color change, gas production, temperature change, and formation of a precipitate.

Front

What is the significance of the pop sound in a hydrogen flame test?

Back

The pop sound indicates the presence of hydrogen gas, which reacts explosively with oxygen.