Science 7 - Baehr - Physical and Chemical Changes

Front

What is a chemical change?

Back

A chemical change occurs when two or more substances join to form new substances with new chemical properties.

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.

Front

Give an example of a physical change.

Back

Changing the color of a wall by painting it.

Front

Give an example of a chemical change.

Back

Cooking eggs.

Front

What happens during a chemical change?

Back

During a chemical change, two or more molecules interact and the molecules change.

Front

What is combustion?

Back

Combustion is a chemical change that occurs when a substance burns, producing heat and light.

Front

What are 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 signs of a physical change?

Back

Signs of a physical change include changes in state (solid, liquid, gas), shape, and size.

Front

Is melting ice a physical or chemical change?

Back

Melting ice is a physical change.

Front

Is rusting of iron a physical or chemical change?

Back

Rusting of iron is a chemical change.