States of Matter

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Across
  1. 4. Tiny piece of matter, like an atom or molecule
  2. 7. Process of a liquid changing to a gas
  3. 8. Energy transferred from a warmer object to a cooler one
  4. 9. Ratio of mass to volume, varies by state of matter
  5. 11. Process of a solid changing to a liquid
  6. 12. State of matter with no fixed shape or volume
  7. 16. Force exerted on an object, can affect state changes
  8. 17. Process of a gas changing to a liquid
  9. 18. Process of a liquid changing to a gas at a specific temperature
Down
  1. 1. Process of a solid changing directly to a gas
  2. 2. Fourth state of matter, like lightning or the sun
  3. 3. Measure of the average kinetic energy of particles, affects state changes
  4. 5. Amount of space that matter occupies
  5. 6. Process of a liquid changing to a solid
  6. 9. Process of a gas changing directly to a solid
  7. 10. State of matter with a fixed volume but no fixed shape
  8. 11. Amount of matter in an object
  9. 13. State of matter with a fixed shape and volume
  10. 14. Solid with a repeating pattern of particles, like ice or diamond
  11. 15. Solid state of water that forms directly from water vapor