Across
- 4. reaction that forms water and carbon dioxide
- 5. substances that start chemical reactions
- 6. substances formed in a chemical reaction
- 7. the seven ________ molecules never appear alone
- 8. the process when new substances are formed
- 9. two reactants combine to form a single product
Down
- 1. representation of chemical reactions using element symbols
- 2. two compounds exchanging cations or anions
- 3. one element replaces another element in a compound
- 7. a compound breaks into two or more parts