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Cambridge IGCSE Chemistry practice

Paper 3 structured question: Chromatography

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Chromatography

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Paper 3Theory (Core)2 marks

Comparison of unknown substances with known standards using chromatography.

Data Table

Chromatography Results

The table compares Rf values of unknown substances with known standards.

SubstanceRf Value
Unknown 10.4
Known A0.4
Known B0.6
Unknown 20.5
Known C0.5
  1. a

    Determine Which unknown substance matches a known substance?

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Chromatography

Paper 3Theory (Core)1 marks

Description

Chromatogram of Dyes

The chromatogram shows three distinct spots labeled A, B, and C, with Rf values of 0.5, 0.3, and 0.7 respectively.

  1. a

    State What can you conclude about the purity of the substance represented by spot A?

    Aim for approximately 1 distinct marking point.

    [1]