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 total mass of reactants before a chemical reaction is equal to the total mass of products after the reaction.

Front

If a reaction starts with 75g of reactants, what should the total mass of products be?

Back

75g

Front

How many Nitrogen (N) atoms are in 4NH₃?

Back

4

Front

What happens to the total mass of substances after a chemical reaction?

Back

It remains the same.

Front

According to the law of conservation of mass, what must be true about the mass of the products in a chemical reaction?

Back

It must be equal to the mass of the reactants.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical 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

In a closed system, if 10g of hydrogen reacts with 15g of oxygen, what is the mass of the water produced?

Back

25g

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.