Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of the reactants equals the total mass of the products.

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

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

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 burning wood.

Front

What happens to the mass of substances during a chemical reaction?

Back

The mass of the substances remains the same before and after the reaction, according to the Law of Conservation of Mass.

Front

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

Back

A physical change does not create a new substance, while a chemical change does.

Front

What is an example of a change in size?

Back

Cutting a piece of paper in half is an example of a change in size, which is a physical change.

Front

If 4 grams of sodium combine with chlorine, how much chlorine is needed to make 10 grams of table salt?

Back

6 grams of chlorine are needed.

Front

What is an example of a reversible physical change?

Back

Freezing and melting water is an example of a reversible physical change.