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 happens to mass in a chemical reaction?

Back

The total mass remains constant; it does not change, even if the substances change.

Front

What is an open system?

Back

An open system is one that can exchange both matter and energy with its surroundings.

Front

What is a closed system?

Back

A closed system is one that can exchange energy but not matter with its surroundings.

Front

Can a chemical reaction produce more mass than it started with?

Back

No, a chemical reaction cannot produce more mass than it started with; it can only rearrange existing mass.

Front

What is an example of a gas escaping in a chemical reaction?

Back

When baking soda reacts with vinegar, carbon dioxide gas is produced and escapes, causing a decrease in mass.

Front

True or False: In a chemical reaction, there is always one product.

Back

FALSE. A chemical reaction can produce multiple products.

Front

If a reaction starts with 20g of reactants, how much mass should the products have?

Back

The products should also have a total mass of 20g.

Front

What is the difference between reactants and products?

Back

Reactants are the starting substances in a chemical reaction, while products are the substances formed as a result of the reaction.

Front

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

Back

The combustion of methane: CH4 + 2O2 → CO2 + 2H2O, where the total mass of reactants equals the total mass of products.