Does it matter?

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Across
  1. 3. study of composition, structure, and properties chemical substance with a definite composition
  2. 5. a mixture that is the same through out
  3. 7. category of elements
  4. 10. change of state
  5. 12. characteristic of matter
  6. 13. amount of matter
  7. 14. vertical column
  8. 16. state of matter
  9. 17. combination of 2 or more types of compounds
Down
  1. 1. knowledge of natural events
  2. 2. a type of mixture
  3. 4. change of state
  4. 6. periodic table unit
  5. 8. not a metal
  6. 9. horizontal row
  7. 11. semiconductor
  8. 12. a type of change
  9. 15. state of mater