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. Examples include freezing, melting, 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 chemical reaction and the rearrangement of atoms. Examples include burning, rusting, and cooking.

Front

Is freezing water a chemical or physical change?

Back

Freezing water is a physical change.

Front

Is making Chex Mix a chemical or physical change?

Back

Making Chex Mix is a physical change.

Front

Are fireworks a chemical or physical change?

Back

Fireworks are a chemical change.

Front

What happens when hydrogen and oxygen combine to create water?

Back

This is a chemical change because new substances (water) are formed.

Front

Is dyeing your hair a chemical or physical change?

Back

Dyeing your hair is a chemical change.

Front

What are some signs of a chemical change?

Back

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

Front

What are some signs of a physical change?

Back

Signs of a physical change include changes in state (solid, liquid, gas), shape, and size without changing the substance's chemical identity.

Front

Can physical changes be reversed?

Back

Many physical changes can be reversed, such as melting ice back into water.