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Chromatography: separating a mixture of inks

Quiz by Oak National Academy: GCSE Chemistry OCR Foundation

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6 questions
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  • Q1
    Which of the following is not part of preparing a chromatography paper?
    marking the solvent front
    drawing a sample line
    heating the paper
    adding a small volume of solvent
    30s
  • Q2
    Why do we use pencil to draw the sample line in chromatography?
    pencil marks dissolve in the solvent
    pencil is more visible than ink
    pencil reacts with the inks to help them separate
    pencil marks do not travel with the solvent
    30s
  • Q3
    What is the purpose of the stationary phase in chromatography?
    to change the colour of the inks
    to hold the substances as they separate
    to absorb the solvent
    to move the solvent
    30s
  • Q4
    True or false? The solvent front should be marked after the paper is removed from the container.
    true
    false
    True or False
    30s
  • Q5
    True or false? If two substances have the same Rf value then they must be the same substance.
    false
    true
    True or False
    30s
  • Q6
    Calculate the Rf value of a spot that travels 55 mm up from the sample line, where the chromatogram shows a solvent front of 86 mm.
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    30s

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