BBC Learning Zone Clips

CLIP 2295

Separating mixtures of materials

Separating mixtures of materials
Key Info
  • Separating mixtures of materials
  • Duration: 01:36
  • An introduction to separating mixtures. When salt is added to water most of it dissolves to make a solution - salt is soluble in water. When sand is added to water it either hangs in the water or forms a layer at the bottom of the container. Sand therefore does not dissolve in water - it is insoluble. It is easy to separate sand and water by filtering the mixture. Salt can be separated from a solution through evaporation. The water can also be recovered as well as the salt if the water vapour is trapped and cooled to condense the water vapour back into a liquid. This process is called distillation.
  • Subject:



    Separating Mixtures of Materials

  • Keywords: salt, water, dissolve, solution, soluble, insoluble, filter, filtration, evaporation, vapour, condense, liquid, distillation
Ideas for use in class
  • This clip would be useful when learning about separating mixtures of materials. It could be shared with pupils before they carry out some hands-on experiments of their own. It might be used in place of some experiments which take some time to observe, such as the distillation process. It would also be a good clip to use to reinforce learning which has taken place over several weeks, or for revision.
Background details
  • Clip language : English
  • Aspect ratio : 16x9

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