States of matter

12345678910
Across
  1. 4. The force that pulls particles towards each other.
  2. 6. What happens to most materials when they are cooled and become smaller.
  3. 7. The process where a liquid changes into a solid when cooled.
  4. 9. The process in which a solid changes into a liquid when heated.
  5. 10. What happens to most materials when they are heated and become larger.
Down
  1. 1. The process by which a liquid changes into a gas at its surface.
  2. 2. The movement of particles from an area of high concentration to an area of low concentration.
  3. 3. The process where a gas changes into a liquid when cooled.
  4. 5. The amount of mass in a given volume of a substance.
  5. 8. The force exerted on a surface per unit area.