Across
- 3. A chemical reaction where heat is absorbed
- 4. The arrangement of electrons in an atom
- 6. The energy required to break bonds in reactants
- 8. A measure of the concentration of hydrogen ions in a solution
Down
- 1. The process of breaking down a compound into its elements
- 2. A negatively charged ion
- 5. A substance that increases the rate of a chemical reaction without being consumed
- 7. A chemical reaction where heat is released