chemistry crossword puzzle

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Across
  1. 3. bonded group of substances
  2. 6. combining substance
  3. 7. change
  4. 9. average warmths
  5. 12. something that takes up space
  6. 14. smallest substance
  7. 15. space,the amount
  8. 17. stuff stored in substances
  9. 18. energy between
Down
  1. 1. chemically combined elements
  2. 2. change different chemical transformation
  3. 4. combination to form structures
  4. 5. reaction materials
  5. 8. the science of substance
  6. 10. combination
  7. 11. substance that cant be broken down
  8. 13. chemicals formed
  9. 16. large space, no shape