Across
- 2. a chemical reaction that gives off heat energy
- 4. the substances present before a chemical reaction
- 5. a chemical reaction that absorbs heat energy
- 7. a chemical reaction
Down
- 1. a chemical change
- 3. the substances that are formed during a chemcial reaction
- 6. a change in matter that doesnt affect its chemical compostion
- 8. material that has mass and takes up space