Intro - Law of Conservation of Mass Review

Front

What does the Law of Conservation of Mass state?

Back

Mass cannot be created nor destroyed, it can only change form.

Front

What are reactants in a chemical reaction?

Back

Reactants are the starting substances in a chemical equation.

Front

What are products in a chemical reaction?

Back

Products are the substances that are produced in a chemical reaction.

Front

True or False: Gases produced in a reaction do not need to be accounted for because they weigh nothing.

Back

False

Front

Which model of a chemical reaction best represents the Law of Conservation of Mass?

Back

Model A represents the Law of Conservation of Mass.

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the mass of reactants equals the mass of products, in accordance with the Law of Conservation of Mass.

Front

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

Back

The total mass of substances remains constant; it is neither created nor destroyed.

Front

How can you demonstrate the Law of Conservation of Mass in a laboratory experiment?

Back

By measuring the mass of reactants before a reaction and the mass of products after the reaction, you can show that the total mass remains the same.

Front

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

Back

The combustion of methane (CH4 + 2O2 -> CO2 + 2H2O) illustrates that the total mass of reactants equals the total mass of products.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.