Mixtures

• Define the term 'mixture' in terms of chemistry

  two or more elements or compounds not chemically combined together
• State the five ways mixtures can be separated


  -filtration

  -crystallisation

  - simple distillation

  -fractional distillation

  -chromatography
• What is the purpose of filtration? give an example


  separate an insoluble solid from a liquid. (e.g. Separating sand from water).
• What is the purpose of evaporation? give an example


  separate a soluble solid from a liquid. e.g (Obtaining salt crystals from saltwater)
• What is the purpose of Crystallisation? give an example


  obtain pure crystals of a soluble solid e.g (Making copper sulfate crystals)
• What is the purpose of Distillation? give an example


  separate a liquid from a mixture based on boiling points. e.g (Obtaining water from saltwater)
• State an example of fractional distillation


  Separating ethanol and water.
• What is the purpose of chromatography? give an example


  separate substances in a mixture based on their solubility and movement through a medium. e.g ( Separating dyes in ink).