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, mass is neither created nor destroyed during a chemical reaction. The total mass of reactants equals the total mass of products.

Front

In a chemical reaction, what must be true for it to be balanced?

Back

A chemical reaction is balanced when both sides have the same number of atoms of each element.

Front

If 5g of reactant A and 4g of reactant B react to form product C, what is the mass of product C?

Back

The mass of product C is 9g, as per the Law of Conservation of Mass.

Front

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

Back

The mass of reactants remains the same before and after the reaction; it is conserved.

Front

What is an example of a chemical reaction that demonstrates the Law of Conservation of Mass?

Back

When magnesium (24g) reacts with fluorine (38g) to produce magnesium fluoride, the total mass of products (62g) equals the total mass of reactants.

Front

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

Back

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

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the Law of Conservation of Mass is upheld, showing that mass is conserved in the reaction.

Front

If 10g of hydrogen reacts with 80g of oxygen, what is the mass of water produced?

Back

The mass of water produced is 90g, as the total mass of reactants equals the total mass of products.

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.