SC1 & SC2

• what is desalination and how is it done?


  Process of removing salt from seawater to make pure water

  -water is separated from salts using distillation
• what is sedimentation and chlorination?


  • sedimentation filters water from rivers or lakes to remove larger particles and impurities
  • chlorination is where chlorine id added to kill microorganisms in the treated water
• what is fractional distillation and what is it used for?


  Separation process. Used to separate components of a mixture based on boiling points is used to make alcoholic drinks and separate out the gasses in the air
• how do you find the Rf value in chromatography?


  Rf=distance moved by the spot/distance moved by the solvent
• why is distillation used?


  makes pure water by separating it from the undissolved solids

  it evaporates the water and then condenses it again using a still
• why can physical changes be reversed?

  the chemical properties dont change as only the arrangement of particles change
• what are the states of matter?


  solid, liquid and gas