Rio Salado Community College

• CHEMISTRY 107

• Name: _______________________________ Date: ______________ Period: ______ Unit 11: Chapter 7 - Chemical Reactions Review Answer Key Define: 1. Reactant: A substance that undergoes change in a chemical reaction. 2. Product: New substances formed as a result of a chemical reaction. 3. Catalyst: A substance that affects the rate of a chemical reaction without being used up in the reaction. 4. Coefficient: Numbers that appear before a formula in a chemical equation to show the relative proportions of each reactant and product. 5. Subscript: A number written lower in a chemical formula indicating the amount of atoms present of an element (this number is not to be changed once written in chemical formula). 6. Law of Conservation of Mass: Matter cannot be created nor destroyed; only changed (atoms can be rearranged). 7. Synthesis reaction (include an example): A chemical reaction in which two or more substances react to form a single substance. (A + B  AB) 8. Decomposition reaction (include an example): A chemi