States of m.

• three states of matter

  
  

  1. Solid

  2. Liquid

  3. Gas
• Solid


  • Forces of attraction between the parts are strong
  • Particles are fixed and can only vibrate
• Liquid


  • Forces of attraction between the parts are weaker
  • Particles can move around each other but are still close together
• Gas


  • Forces of attraction between the parts are very weak
  • Particles can move around freely
• Melting


  1. Solid particles gain enough energy to overcome forces of attraction

  2. Particles can then move around each other and become a liquid
• Boiling


  1. Liquid particles gain enough energy to overcome forces of attraction

  2. Particles can then move freely and become a gas
• Freezing


  1. Liquid particles lose energy

  2. Forces of attraction hold particles in fixed positions and they become a solid
• The temperature at which melting/freezing occurs is called the melting/freezing point
• The melting point and freezing point of a substance can be exactly the same
• Deposition


  The process of a gas changing directly to a solid
• Sublimation


  The process of a solid changing directly to a gas
• some substances can change directly from a solid to a gas or from a gas to a solid, without going through the liquid phase