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

What evidence supports the Law of Conservation of Mass in a chemical reaction?

Back

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

Front

If 5g of reactant A and 4g of reactant B are used, what is the total mass of the products?

Back

The total mass of the products will be 9g, which is the sum of the masses of reactants A and B.

Front

What happens to atoms during a chemical reaction?

Back

Atoms are rearranged to form new substances, but they are neither created nor destroyed.

Front

Define 'molecule'.

Back

A molecule is a group of atoms bonded together.

Front

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

Back

B must be 4g to satisfy the 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

If 24g of magnesium reacts with 40g of fluorine, what is the mass of magnesium fluoride produced?

Back

64g of magnesium fluoride is produced.

Front

What does it mean when we say matter can be transformed?

Back

It means that matter can change forms or states, but the total mass remains constant.