chemistry crossword

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Across
  1. 3. from a solid to a liquid
  2. 5. particles are closely packed together
  3. 7. from a liquid to a solid
  4. 9. elements and compounds not joined together
  5. 10. smallest part of an element
  6. 14. from a liquid to a gas
  7. 15. a gas we breathe out
Down
  1. 1. this can fill a container
  2. 2. made up of one type of atom
  3. 4. where all the elements are found
  4. 6. a gas that we breathe in
  5. 8. a form of carbon
  6. 11. how reactive something is
  7. 12. made up of two or more elements joined together
  8. 13. particles are far apart