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

 - reactant
 - product
Read the underlined text carefully. Look for information about what happens to carbon dioxide in this chemical reaction.
Gasoline provides the energy that powers many car engines. In an engine, gasoline and oxygen are mixed together and burned, creating carbon dioxide gas and water vapor. This process releases energy that the engine uses to turn the wheels, making the car move.
The underlined text tells you that carbon dioxide forms when gasoline combines with oxygen. Because carbon dioxide is produced by this chemical reaction, carbon dioxide is a product.