8.5E - Law of 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 reactants equals the total mass of products.

Front

If 4 grams of hydrogen and 32 grams of oxygen react, what is the total mass of water produced?

Back

36 grams of water.

Front

What should the total mass of products be if a reaction starts with 75 grams of reactants?

Back

75 grams of products.

Front

In the reaction AB -> A + B, if AB has 12g and B has 5g, how much does A weigh?

Back

7 grams.

Front

What is produced when 2g of hydrogen reacts with 4g of oxygen?

Back

6 grams of water.

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

What is a reactant?

Back

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

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

How do you calculate the mass of a product if you know the mass of the reactants?

Back

The mass of the product is equal to the mass of the reactants, according to the Law of Conservation of Mass.

Front

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

Back

The mass of reactants remains constant and is equal to the mass of the products.