Atomic Structure and the Periodic Table

• Mixtures are two or more elements of compounds that are not chemically combined
• Components of a mixture retain their own properties
• Mixtures can be separated by physical processes such as filtration, crystallisation and distillation
• Crystallisation:

  • Mixture is gently warmed
  • Water evaporates leaving crystals of pure salt
• Fractional distillation:

  • used to separate mixtures where components have different boiling points
• Chromatography is used to separate different soluble coloured components of a mixture