Chapter 16

2. energy is taken in or absorbed
7. mass the sum of the atomic masses of the atoms in a molecule
8. insoluble substance that crystallizes out of solution
10. one element displaces another from a compound
11. a substance that slows down a chemical reaction
12. a substance that undergoes a chemical change; substance to the left of a yield sign in an equation
14. the number placed in front of a symbol or formula; used in balancing chemical equations
16. reaction a chemical change in which two or more elements or compounds unite to form one compound

1. the positive part of one compound unites with the negative part of another compound
3. an inhibitor; slows down the decay by retarding the processes that cause the decay
4. a substance formed as a result of a chemical change; substance to the right of a yield sign in an equation
5. a chemical change in which a substance breaks down or decomposes into other substances
6. a shorthand description of a chemical reaction; tells the reactants and products and their ratios
9. a substance that increases the rate of a chemical reaction without being permanently changed itself
13. sum of the average atomic masses of the atoms or ions present in the formula of a compound
15. energy is released or given off