States of matter

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Across
  1. 4. anything that has mass and takes up space
  2. 5. a substance with a definite volume that takes the shape of its container; incompressible
  3. 8. to increase in volume
  4. 9. to use pressure to reduce the volume of a substance
  5. 11. two words: a substance that sublimates at room temperature
  6. 13. the quantity of matter in a substance
  7. 15. the things that could be changed in an experiment
  8. 21. the amount of space that a substance occupies
  9. 22. two words to describe Democritus' idea about matter
  10. 23. changing from liquid to solid
Down
  1. 1. changing from liquid to gas
  2. 2. volume can be measured in this unit
  3. 3. the characteristics of a substance
  4. 6. two words: the gas produced when vinegar is added to sodium bicarbonate
  5. 7. a substance that takes the shape and volume of its sealed container; compressible
  6. 10. mass can be measured in this unit
  7. 12. a substance with a definite shape and volume; incompressible
  8. 14. changing from solid to gas
  9. 16. the gas produced when yeast is added to hydrogen peroxide
  10. 17. liquids and gases do this; solids do not
  11. 18. two words meaning to change one thing, measure one thing and keep everything else the same
  12. 19. changing from gas to liquid
  13. 20. changing from solid to liquid