Across
- 2. organic catalysts
- 7. mixtures
- 10. period
- 11. H2O
- 13. mass
- 15. a table of chemical elements
- 17. charged atom
- 18. groups
- 19. mass number-atomic mass
Down
- 1. fire
- 3. releases heat energy
- 4. workplace hazardous materials information system
- 5. shinny
- 6. oxygen combines with a substance
- 8. absorbs heat
- 9. burning
- 12. reaction
- 14. physical substance
- 16. air combine with metal