Science Crossword Puzzle

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Across
  1. 5. the particles break free slowly, one at a time
  2. 6. state of matter where the particles speed up and start to spread out
  3. 7. property of an object that tells how much matter it contains
  4. 9. removing heat to change a liquid to a solid
  5. 10. the characteristics or traits that make something unique
  6. 11. state of matter where the particles are moving the fastest
  7. 12. more than one atom together
  8. 14. when the particles in a solid reach a certain speed and break free
Down
  1. 1. particles break free suddenly, in large groups
  2. 2. the scientific word for "stuff'
  3. 3. how tightly the particles are packed together
  4. 4. removing heat to change a gas to a liquid
  5. 8. how much space a material takes up
  6. 13. state of matter where the particles move slowly in one place