PHYSICAL CHANGES

• Solid


  Melts when it is heated - particles gain energy - moves further apart (turn to liquid)
• Liquids


  Evaporate when heated - particles gain energy moves further apart (turn to gas)

  
  

  Freezes when cooled - particles lose energy - moves closer together (turns to solid)
• Gases


  Condense when cool - particles loose energy - move closer together (turn to liquid)
• When does evaporation Happen quickest?


  Boiling point
• A saturated solution is....


  When you cannot dissolve any more solvent into the solute
• Which gas is most soluble in water?

  Ammonia (NH3)
• Chemical formula for nitrogen


  N2
• Chemical formula for oxygen

  O2
• Chemical formula for Ammonia

  NH3
• Carbon dioxide chemical formula


  CO2