Flashcard on the 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 is a Physical Change?

Back

A Physical Change is a change that affects one or more physical properties of a substance without altering its chemical composition, such as water freezing into ice.

Front

What is a Chemical Change?

Back

A Chemical Change is a change that results in the formation of new chemical substances, such as rust forming on iron.

Front

In the reaction H₂ + O₂ → H₂O, what is the total mass of the reactants?

Back

The total mass of the reactants is the sum of the masses of H₂ and O₂, which is 3.4g + 10g = 13.4g.

Front

What is the mass of H₂O produced when 3.4g of H₂ reacts with 10g of O₂?

Back

The mass of H₂O produced is 13.4g, according to the Law of Conservation of Mass.

Front

True or False: The mass of the products in a chemical reaction is always less than the mass of the reactants.

Back

False. The mass of the products is equal to the mass of the reactants.

Front

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

Back

The total mass of substances remains constant; it is conserved.

Front

What is an example of a gas?

Back

An example of a gas is oxygen (O₂).

Front

What is an example of a solid?

Back

An example of a solid is ice.

Front

What is an example of a liquid?

Back

An example of a liquid is water.