Across
- 4. releases heat
- 5. breaking down
- 9. chemical that speeds up the reaction
- 11. one element takes the place of another
- 12. part that you can
- 14. brings change
- 15. two elements take the place of another
Down
- 1. changes in the experiment
- 2. burning
- 3. a response
- 6. doesn't change in the experiment
- 7. the space something takes up
- 8. combining part
- 10. amount of matter
- 13. absorbs heat