Law of Conservation of Mass 7th

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that matter cannot be created or destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What is a sign that a chemical reaction has occurred?

Back

Formation of a gas is a sign that a chemical reaction has occurred.

Front

What does it mean for a chemical reaction to be balanced?

Back

A chemical reaction is balanced when both sides have the same number of atoms.

Front

If Maria fills a bowl with 200 g of water and freezes it, what will be the mass of the frozen water?

Back

The mass of the frozen water will be 200 g.

Front

What happens to the mass of reactants in a chemical reaction?

Back

The mass of the reactants remains the same as the mass of the products.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change.

Front

What does it mean when we say matter is not created or destroyed?

Back

It means that in a closed system, the total amount of matter remains constant during a chemical reaction.

Front

How can you tell if a chemical reaction has occurred?

Back

Signs include color change, temperature change, formation of a gas, or formation of a precipitate.

Front

What is a reactant?

Back

A reactant is a substance that undergoes a chemical change in a reaction.