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 the reactants equals the total mass of the 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

What are products in a chemical equation?

Back

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

Front

How do you determine if a chemical equation is balanced?

Back

A chemical equation is balanced when the number of atoms of each element is the same on both sides of the equation.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has equal numbers of each type of atom on both sides, reflecting the Law of Conservation of Mass.

Front

In the equation 2H2 + O2 → 2H2O, what are the reactants?

Back

The reactants are 2H2 and O2.

Front

In the equation 2H2 + O2 → 2H2O, what are the products?

Back

The products are 2H2O.

Front

How many oxygen atoms are in the equation 2H2 + O2 → 2H2O?

Back

There are 2 oxygen atoms in the reactants.

Front

What does it mean for an equation to be unbalanced?

Back

An unbalanced equation has unequal numbers of atoms of one or more elements on either side, violating the Law of Conservation of Mass.

Front

If 4NH3 decomposes, how many nitrogen atoms are produced?

Back

4 nitrogen atoms are produced.