Particle model of solids, liquids and gases

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Across
  1. 2. The particles move around really fast.
  2. 4. Little bits of matter.
  3. 5. Solids, liquids and gases are all states of...
  4. 7. The atoms are all the same in this.
  5. 8. An idea that scientists come up with to explain something.
  6. 9. When 2 or more particles are stuck together.
  7. 13. Things do this when they are heated.
  8. 14. The particles are in a fixed pattern.
  9. 15. Idea about how something works, made by scientists.
Down
  1. 1. Anything made of matter.
  2. 3. When gas or liquid particles spread out.
  3. 4. This builds up when particles hit the sides of something.
  4. 6. The smallest particle of matter.
  5. 10. Things to this when they cool down.
  6. 11. These flow and have no fixed shape but a fixed volume.
  7. 12. When particles are packed very close together.