Across
- 2. chemical reaction that gives off heat energy
- 4. the substance present before a chemical change occurs
- 5. a chemical reaction that absorbs heat energy
- 7. a chemical reaction
Down
- 1. a chemical change
- 3. the substances formed during a chemical reaction
- 6. a change in matter that does not affect its chemical composition
- 8. material that has mass and takes up space