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Across
  1. 1. the answer is in the title
  2. 4. I don't know, and you don't know
  3. 6. a compound or substance that has been purified, or prepared, especially man-made
  4. 12. anything that has mass or takes up space
  5. 13. the everyday-language name of a substance
  6. 14. the building blocks of matter
  7. 16. you breathe it in
  8. 17. a type of matter that is hard
  9. 18. a group of elements with similar chemical properties
  10. 19. a group of elements with similar chemical properties
Down
  1. 2. a subject dealing with chemicals, and/or life on Earth
  2. 3. a type of scientist that works with chemicals
  3. 5. the smallest thing in the world
  4. 7. when 2 substances combine to make a new substance
  5. 8. The creator of the table of elements
  6. 9. a code that represents the number and kinds of atoms in 1 particle of a substance
  7. 10. it's a big world out there
  8. 11. a particular kind of matter with unique properties
  9. 15. what is water?