Chemical and Physical Changes

Front

What is a chemical change?

Back

A process where one or more substances are transformed into new substances with different properties.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

Example of a chemical change?

Back

A nail rusting.

Front

Example of a physical change?

Back

Melting ice.

Front

What happens during a chemical change?

Back

New substances are formed.

Front

What happens during a physical change?

Back

The substance may change form or appearance but remains the same substance.

Front

Is dissolving sugar in water a chemical change?

Back

No, it is a physical change because the sugar can be recovered.

Front

Is burning wood a chemical change?

Back

Yes, it is a chemical change because new substances (ash, smoke) are formed.

Front

What is an example of a reversible physical change?

Back

Freezing and melting of water.

Front

What is an example of an irreversible chemical change?

Back

Gasoline burning in a car engine.