Chemistry crossword

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