Across
- 1. takes up space
- 3. when reaction complete
- 4. material release energy when burned
- 6. substance you have to begin with
- 10. chemist uses to control rates
- 12. make or become different
- 13. the formula of a form
- 15. energy releases
- 17. # placed in front of chemical formula
- 18. two or more elements
- 19. used to decrease rate of reaction
- 20. cells in body contain biological catalysts
Down
- 2. 2 elements in different compounds trade spots
- 5. material increases rate of reaction
- 7. breaks down compounds
- 8. attraction between 2 atoms
- 9. solid forms solution during chemical reaction
- 11. energy not absorbed
- 14. rapid reaction between oxygen & substance
- 16. study of matter and how it changes