Change of State

123456789
Across
  1. 1. If the substance is pure, its melting point is _______________ to its freezing point under the same conditions.
  2. 3. The temperature remains the same during melting as heat energy absorbed is used to overcome the forces of _____________ holding them in their fixed positions.
  3. 5. A rise in temperature will cause the _____________ energy of particles to increase.
  4. 6. When temperature is constant during melting, the substance exist as a solid and liquid ________________.
  5. 7. The process when solids changes directly into a gas, skipping the liquid stage.
  6. 8. The change in state when liquid becomes solid.
Down
  1. 1. The process in which particles have enough energy to escape from the surface as gas.
  2. 2. Particles are close together and able to move around one another.
  3. 4. The temperature that is ________________ during boiling is the boiling point of the substance.
  4. 9. The temperature remains the same during freezing because heat energy is ________________ as particles take up fixed positions.