Change of state

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Across
  1. 4. - the melting point is_____ if the substance has impurities
  2. 7. temperature at which the substance turns into a liquid
  3. 9. when the solid turns into a gas
  4. 11. these are broken during a change of state
  5. 13. when the solid turns into a liquid
  6. 14. when the liquid turns into a gas
  7. 15. to check for this criteria check the melting point and boiling point
Down
  1. 1. particles at surface of liquid gain enough energy to break forces of attraction and escape as gas
  2. 2. a liquid which easily evaporates due to weak forces of attraction
  3. 3. temperature at which the solid turns into a liquid
  4. 5. when substances have high mpt or bpt they have ________ forces of attraction
  5. 6. when the temperature is increased particles _____ energy
  6. 8. when the liquid turns into a solid
  7. 10. when the temperature is lowered particles ______ energy
  8. 12. when gas turns into a liquid