Law of conservation of mass

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that in a closed system, the mass of the reactants must equal the mass of the products in a chemical reaction.

Front

If a reaction starts with 20g of reactants, how much mass will the products have?

Back

20g of products.

Front

Which of the following is not a chemical reaction?

Back

Melting of ice.

Front

What is the measure of the amount of matter?

Back

Mass.

Front

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

Back

Both sides of the reaction must have the same number of atoms.

Front

In the reaction A + B -> C, if A has 5g and C has 9g, how much does B weigh?

Back

4g.

Front

What is a reactant?

Back

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

Front

What is a product?

Back

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

Front

What happens to mass during a chemical reaction?

Back

Mass is neither created nor destroyed; it is conserved.

Front

What is an example of a physical change?

Back

Melting of ice.