changes of state

• properties of solids

  • particles close together in a fixed, regular arrangement
  • not much energy so vibrate about a fixed point
  • strong forces of attraction
  • highest density
• properties of liquids

  • weaker forces of attraction than solids
  • particles close together, but can move & form irregular arrangements
  • more energy than solids
  • move in random directions at low speeds
  • less dense than solids
• properties of gases

  • particles far apart
  • no forces of attraction
  • most energy
  • free to move, travel in random directions at high speeds
  • low density