Physical & Chemical Change

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 changes in size, shape, or state of matter.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of one or more new substances with different properties. This often involves a reaction and may produce light, heat, gas, or a color change.

Front

Give an example of a physical change.

Back

An example of a physical change is melting ice into water.

Front

Give an example of a chemical change.

Back

An example of a chemical change is rust forming on iron.

Front

What happens to the substances in a physical change?

Back

In a physical change, the substances retain their original properties and composition; they do not change into new substances.

Front

What happens to the substances in a chemical change?

Back

In a chemical change, the original substances are transformed into new substances with different properties.

Front

What are some signs of a chemical change?

Back

Signs of a chemical change include the production of gas, a change in color, the formation of a precipitate, and the release or absorption of heat.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not create new substances, while a chemical change results in the formation of new substances.

Front

What is an example of a change in state of matter?

Back

An example of a change in state of matter is water boiling and turning into steam.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.