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 reactants equals the total mass of products.

Front

What happens to the mass of a substance when it changes state, such as melting?

Back

The mass remains the same when a substance changes state, such as melting, because no mass is lost or gained.

Front

If a chemical reaction starts with 50 grams of reactants, what should be the total mass of the products?

Back

The total mass of the products should also be 50 grams, according to the Law of Conservation of Mass.

Front

In a chemical reaction, if 10 grams of substance A reacts with 5 grams of substance B, what is the total mass of the products?

Back

The total mass of the products will be 15 grams, which is the sum of the masses 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

If 20 grams of reactants produce 20 grams of products, what does this demonstrate?

Back

This demonstrates the Law of Conservation of Mass, showing that mass is conserved in the reaction.

Front

What is the mass of a balloon filled with air when it is warmed?

Back

The mass of the balloon stays the same, even though the air inside expands and the balloon gets larger.

Front

In the reaction 2H2 + O2 -> 2H2O, if you start with 4 grams of hydrogen and 32 grams of oxygen, what is the mass of water produced?

Back

The mass of water produced will be 36 grams, which is the sum of the masses of hydrogen and oxygen.

Front

What is the significance of measuring mass in chemical reactions?

Back

Measuring mass is important in chemical reactions to ensure that the Law of Conservation of Mass is upheld.