Chemical and Physical Changes

Front

What is a chemical change?

Back

A chemical change is a process that alters the identity of a substance, resulting in the formation of one or more new substances.

Front

What is a physical change?

Back

A physical change is a process that does not alter the identity of a substance; the substance remains the same even though its form may change.

Front

Give an example of a chemical change.

Back

Rusting of a nail is an example of a chemical change.

Front

Give an example of a physical change.

Back

Melting of an ice cube is an example of a physical change.

Front

What happens to the identity of a substance during a chemical change?

Back

The identity of the substance changes during a chemical change.

Front

What happens to the identity of a substance during a physical change?

Back

The identity of the substance remains the same during a physical change.

Front

Is copper tarnishing a physical or chemical change?

Back

Copper tarnishing is an example of a chemical change.

Front

What is an indicator of a chemical change?

Back

An indicator of a chemical change can include color change, gas production, or the formation of a precipitate.

Front

What is an indicator of a physical change?

Back

An indicator of a physical change can include changes in state, such as melting or freezing.

Front

Can a chemical change be reversed?

Back

Chemical changes are often not reversible, unlike physical changes which can usually be reversed.