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Gas chromatography — OCR GCSE Combined Science A Definition

Home
Combined Science
Key terms
Gas chromatography

GCSE Combined Science · key term

Gas chromatography

Definition

Chromatography in which an unreactive carrier gas carries a vaporised sample through a column containing the stationary phase.

Used by OCR

How each exam board covers it

OCR GCSE Combined Science A · J250

Specification C2.1k · Chemistry Paper 1

Paper chromatography, thin-layer chromatography and gas chromatography can all help distinguish pure substances from mixtures.
Revise: Chromatography for Purity Testing

OCR Combined Science A past papers

Exam tips

1
When suggesting a method, link it to the sample: soluble dyes suit paper chromatography or TLC; gases and liquids that can be vaporised suit gas chromatography.

Related key terms

Chromatogram
Chromatography
Impure substance
Mobile phase
Paper chromatography

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Stationary phase

Thin-layer chromatography (TLC)