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Cambridge AS & A Level Chemistry

37.2Gas/liquid chromatography

Gas/liquid chromatography in Cambridge AS & A Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 37.2.1Describe the stationary phase, mobile phase and retention time.
  2. 37.2.2Interpret gas chromatograms to find the percentage composition of a mixture.
  3. 37.2.3Explain retention times by interaction with the stationary phase.

Lessons

  • Gas-liquid chromatography and HPLC

    40 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Gas/liquid chromatography: sample question

1 mark

The oven temperature of a gas chromatograph is raised from 80 °C to 120 °C, with everything else unchanged. What happens to the retention times?

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