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Chromatography: separating a mixture of inks

Quiz by Oak National Academy: GCSE Combined Science AQA Foundation

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6 questions
Show answers
  • Q1
    True or false? Rf values can be calculated from a chromatogram of unknown samples. These Rf values can be compared against sample data to identify unknown substances.
    true
    false
    True or False
    30s
  • Q2
    Which of these does not need to remain constant for a fair comparison of Rf values between two chromatograms?
    the temperature of the solvent
    the concentration of the solvent
    the size of the paper
    the samples being analysed
    the type of paper used
    30s
  • Q3
    If a substance is insoluble in the chosen solvent, which of the following would happen?
    the substance will stay at the sample line
    the substance will have a negative Rf value
    the substance will move with the solvent front
    the substance will have an Rf value above 1
    30s
  • Q4
    What is the Rf value of a solvent front that travels 8.0 cm and a substance spot that travels 20 mm?
    Users enter free text
    Type an Answer
    30s
  • Q5
    True or false? The temperature does not affect the outcome of the chromatography process.
    false
    true
    True or False
    30s
  • Q6
    A chromatogram is collected and two different substances have similar Rf values. What might have caused this? They must have similar ______ in the solvent used.
    Users enter free text
    Type an Answer
    30s

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