English National Curriculum - Science Science
Mission Objectives
Describe how paper chromatography can be used to identify substances
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Words and meanings to learn
substance
Physical matter which exists within the world.
solvent
A substance which can dissolve differing substances.
rectify
To correct something by getting rid of any errors.
evaporate
The process of turning from liquid into vapour.
Rf
Retention factor that is used to identify and compare compounds in thin-layer chromatography.
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Resources: A 250 cm3 beaker, a wooden spill, a rectangle of chromatography paper, four known food colourings labelled A–D, an unknown mixture of food colourings labelled U, five glass capillary tubes, a paper clip, a ruler, a pencil.
Expert film
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