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 the reactants equals the total mass of the products.

Front

What happens to mass during a chemical reaction?

Back

During a chemical reaction, the total mass remains constant; it does not change.

Front

If 100 grams of coal are burned, how much mass should be present in the products?

Back

The mass of the products should also be 100 grams, according to the Law of Conservation of Mass.

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

True or False: The mass of the reactants is always equal to the mass of the products.

Back

True.

Front

If you start with 230 grams of sliced apple, what is the mass after cutting it?

Back

The mass remains 230 grams; cutting does not change the mass.

Front

What is an example of a chemical reaction?

Back

Burning wood is an example of a chemical reaction where reactants (wood and oxygen) produce products (ash, smoke, and gases).

Front

How many grams of oxygen are needed to show conservation of mass in a reaction with 100 grams of coal?

Back

7 grams of oxygen are needed.

Front

What does it mean if mass is 'destroyed' in a reaction?

Back

It means that the mass would disappear, which contradicts the Law of Conservation of Mass.