Chemical and Physical Changes

Front

What is a physical change?

Back

A change that does not alter the chemical composition of a substance. Examples include melting, freezing, and tearing.

Front

What is a chemical change?

Back

A change that results in the formation of one or more new substances with different properties. Examples include burning, rusting, and baking.

Front

What happens to the weight of matter during a physical change?

Back

The weight stays the same.

Front

What happens to the weight of matter during a chemical change?

Back

The weight stays the same, but the substances change.

Front

Can you give an example of a physical change?

Back

Tearing paper or melting ice.

Front

Can you give an example of a chemical change?

Back

Baking a cake or burning wood.

Front

What is the law of conservation of mass?

Back

In a closed system, mass is neither created nor destroyed during a chemical or physical change.

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

Burning wood or cooking an egg.

Front

What are reactants in a chemical reaction?

Back

The starting substances that undergo change.