Complete the sentence.
In this chemical reaction, nitrogen is a ().

 - product
 - reactant
Read the underlined text carefully. Look for information about what happens to nitrogen in this chemical reaction.
Did you know that lightning helps provide nutrients to plants on Earth? When lightning strikes, the air around it becomes extremely hot. This leads to the formation of nitric oxide from the nitrogen and oxygen gases in the air. Nitric oxide plays an important role in helping plants grow.
The underlined text tells you that when nitrogen and oxygen combine, nitric oxide is formed. When nitrogen and oxygen react, or go through a chemical change, their atoms are rearranged to form nitric oxide. Because nitrogen reacts in this chemical reaction, nitrogen is a reactant.