Physical and Chemical Changes

Front

What is a Physical Change?

Back

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 change that results in the formation of new chemical substances.

Front

Give an example of a Chemical Change.

Back

Burning wood, rusting iron, or exploding fireworks.

Front

What happens to a substance during a Physical Change?

Back

The substance may change shape, size, or state, but its chemical identity remains the same.

Front

What is Mass?

Back

The amount of matter in a substance, which depends on how much of the substance there is.

Front

What is Density?

Back

The mass of a substance divided by its volume; it does not depend on the amount of substance.

Front

What is Evaporation?

Back

The process by which liquid turns into vapor.

Front

What is Condensation?

Back

The process by which vapor turns back into liquid.

Front

What is Melting?

Back

The process of a solid turning into a liquid when heated.

Front

What is Freezing?

Back

The process of a liquid turning into a solid when cooled.