Matter

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Across
  1. 2. Theory A scientific model that explains the behavior of matter.
  2. 3. The process where particles of a substance mix with a liquid to form a solution.
  3. 4. The three physical forms in which matter can exist: solid, liquid, and gas.
  4. 7. The change of a liquid to a gas when heat is added.
  5. 10. Groups of atoms bonded together.
  6. 12. A state of matter where particles move around each other but remain close.
  7. 13. A state of matter where particles move quickly and are far apart.
  8. 14. The decrease in volume of a substance when cooled.
  9. 16. A measure of the average kinetic energy of particles in a substance.
  10. 17. Everything that has mass and takes up space.
  11. 18. A state of matter where particles are closely packed and vibrate in place.
Down
  1. 1. The energy of motion; increases as temperature rises.
  2. 5. The empty areas between particles that allow dissolving and mixing.
  3. 6. The smallest unit of matter that retains its properties.
  4. 8. A material made up of only one type of particle.
  5. 9. The amount of space an object or substance occupies.
  6. 11. The increase in volume of a substance when heated.
  7. 14. The change of a gas to a liquid when heat is removed.
  8. 15. The force that pulls particles toward each other.