Final answer:
A chemical change is a reaction that results in the formation of new substances. Chemical bonds are broken, and atoms rearrange themselves to form new substances with new chemical bonds.
Step-by-step explanation:
A chemical change, also known as a chemical reaction, occurs when one or more substances are changed into one or more new substances. In a chemical change, the chemical bonds of the substances break, and the atoms rearrange themselves to form new substances with new chemical bonds. Examples of chemical changes include the burning of gasoline and the formation of water from hydrogen and oxygen.