Physical and Chemical 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. It involves a change in the identity of the substance, such as rusting, burning, or cooking.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is an example of a sign that a chemical reaction has occurred?

Back

Formation of a gas, such as bubbles in a liquid.

Tags

NGSS.MS-PS1-2

Front

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

Back

Chemical changes alter the substance's identity, while physical changes do not.

Front

Is melting butter for popcorn a chemical or physical change?

Back

Physical change.

Front

What is an example of a physical change?

Back

Crumpling paper.

Front

What is NOT an example of a physical change?

Back

Rusting of iron.

Front

What evidence indicates a chemical change?

Back

Signs include a change in color, formation of a gas, and production of a solid from liquids.

Tags

NGSS.MS-PS1-2

Front

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

Back

The identity of the substance changes.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

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

Back

The identity of the substance remains the same.

Tags

NGSS.MS-PS1-4