Chemical Equations

In a chemical reaction, we use the word reactants for

• the substances we start with

• the substances we end up with

In the chemical equation shown, the reactants are indicated by

• A

• B

The reactants in a chemical equation appear

• on the left side of the arrow

• on the right side of the arrow

In a chemical reaction, we use the word products for

• the substances we start with

• the substances we end up with

In the chemical equation shown, the products are indicated by

• A

• B

The products in a chemical equation appear

• on the left side of the arrow

• on the right side of the arrow

Which of the following is a chemical formula?

• A

• -->

• N₂ + 3 H₂

• NH₃

Which of the following is a chemical formula?

• H₂

• 3 H₂

• B

• 3

The coefficients in this equation are

• black

• blue

• red

• green

coefficients tell us

• How many of each kind of atom are in a molecule

• How many of each kind of molecule are needed in a balanced chemical reaction

• which formulas are reactants and which are products