Physical Changes versus Chemical Changes and States of Matter

Front

What is a physical change?

Back

A physical change is a change in which matter retains its identity and properties. Examples include slicing, freezing, and melting.

Front

What is a chemical change?

Back

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

Front

Can a chemical change be undone?

Back

No, a chemical change cannot be easily undone.

Front

What happens to the molecules in a solid?

Back

In a solid, molecules are closely packed together and vibrate in place.

Front

What happens to the molecules in a liquid?

Back

In a liquid, molecules are close together but can move past one another, allowing liquids to flow.

Front

What happens to the molecules in a gas?

Back

In a gas, molecules are far apart and move freely, filling the space available.

Front

Give an example of a physical change.

Back

Slicing apples is an example of a physical change.

Front

Give an example of a chemical change.

Back

Rusting of a bike is an example of a chemical change.

Front

What is the state of matter where molecules are most spread out?

Back

Gas is the state of matter where molecules are most spread out.

Front

What is the definition of matter?

Back

Matter is anything that has mass and takes up space.