Chemical and 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. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include burning, rusting, and cooking.

Front

Is melting butter for popcorn a chemical or physical change?

Back

Physical change.

Front

Is burning wood a chemical or physical change?

Back

Chemical change.

Front

What happens when heat is taken away from a container of water?

Back

It will become a solid.

Front

What is an example of a physical change?

Back

Melting ice, dissolving sugar in water, or breaking a glass.

Front

What is an example of a chemical change?

Back

Burning paper, rusting iron, or baking a cake.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not change the substance's chemical identity, while a chemical change results in new substances being formed.

Front

What happens to ice cream when left out at room temperature?

Back

It melts, which is a physical change.

Front

What is an indicator of a chemical change?

Back

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