Law of Conservation of Mass

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 are reactants in a chemical equation?

Back

Reactants are the starting substances in a chemical reaction that undergo change to form products.

Front

In the equation N2 + H2 → NH3, identify the reactants.

Back

The reactants are N2 and H2.

Front

How many hydrogen atoms are in one molecule of NH3?

Back

There are 3 hydrogen atoms in one molecule of NH3.

Front

How many hydrogen atoms are in 4NH3?

Back

There are 12 hydrogen atoms in 4NH3 (4 x 3 = 12).

Front

What does it mean for a chemical equation to be balanced?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved.

Front

Is the equation N2 + 3H2 → 2NH3 balanced?

Back

Yes, this equation is balanced.

Front

Is the equation N2 + H2 → NH3 balanced?

Back

No, this equation is not balanced.

Front

How many nitrogen atoms are in 4NH3?

Back

There are 4 nitrogen atoms in 4NH3 (4 x 1 = 4).

Front

What is a product in a chemical reaction?

Back

Products are the substances formed as a result of a chemical reaction.