Conservation of Mass

Front

What does the Law of Conservation of Mass state?

Back

Matter cannot be created or destroyed in a chemical reaction.

Front

What is the mass of an object after a physical change, such as boiling an egg?

Back

The mass remains the same; for example, a 55-gram egg remains 55 grams after boiling.

Front

What are the substances called that are formed as a result of a chemical reaction?

Back

Products.

Front

When sodium and chlorine react to form sodium chloride, what is sodium chloride classified as?

Back

A product.

Front

Is melting butter for popcorn a chemical or physical change?

Back

Physical change.

Front

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

Back

A chemical change results in the formation of new substances, while a physical change does not change the substance's chemical identity.

Front

Can mass change during a chemical reaction?

Back

No, the total mass of reactants equals the total mass of products.

Front

What is an example of a physical change?

Back

Melting, boiling, or dissolving.

Front

What is an example of a chemical change?

Back

Burning, rusting, or cooking.

Front

What happens to the atoms in a chemical reaction?

Back

Atoms are rearranged to form new substances, but they are not created or destroyed.