Across
- 4. a number placed in front of a formula to balance a chemical equation
- 5. a reaction where one element is substituted for another element in a compound
- 8. a substance that changes during a reaction
Down
- 1. reaction where a compound breaks down into two or more simpler substances
- 2. when two or more reactants combine to form a single product
- 3. a reaction where the positive and negative ions of two ionic compounds form two new compounds
- 6. combination of a substance with oxygen, involving the production of heat and light
- 7. a substance that is present at the end of a chemical reaction