States of Matter and Phase Changes

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Across
  1. 3. gas -> solid
  2. 5. solid, liquid, and gas are the three __________ of matter
  3. 8. this theory tells us that all matter is made of particles and those particles are in constant motion
  4. 11. this occurs when matter changes from one state to another state
  5. 13. gas -> liquid
  6. 15. liquid -> gas
  7. 16. this state has particles that are close together but can move past each other
Down
  1. 1. this occurs when thermal energy is removed, particles slow down and move closer together
  2. 2. liquid -> solid
  3. 4. solid -> gas
  4. 6. solid -> liquid
  5. 7. heat
  6. 9. the energy of motion
  7. 10. this state has particles that spread out and move freely to fill any container
  8. 12. this state has particles that are tightly packed and vibrate in place
  9. 14. this occurs when thermal energy is added, particles move faster and spread apart