Question

this passage describes a chemical reaction. read the passage. then, follow the instructions below.
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.
complete the sentence.
in this chemical reaction, oxygen is a ______.
reactant product

Explanation:

In a chemical reaction, reactants are the substances that undergo a change. The passage states that gasoline and oxygen are mixed and burned. So, oxygen is a reactant as it is part of the starting substances in the reaction.

Answer:

reactant