BRAINCAKEChromatography
Revision notes for Chromatography in AQA Chemistry (7405). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.
- ChromatographyChromatography is used to separate and identify the components of a mixture.
- Thin-Layer ChromatographyThin-layer chromatography (TLC) is a quick, cheap way to separate a small sample, check its purity or identify its components.
- Rf ValuesIn TLC, each component moves a characteristic distance relative to the solvent.
- Column ChromatographyColumn chromatography (CC) works on the same principle as TLC, but is used to separate and collect larger amounts of the components of a mixture…
- Gas ChromatographyGas chromatography (GC) separates mixtures of volatile substances: liquids or gases that can be vaporised without decomposing.
- Retention TimesIn gas chromatography, the retention time of a substance is the time taken from injection of the sample to that substance reaching the detector.
- Combining Chromatography with Mass SpectrometryGas chromatography separates a mixture very well, but retention times alone cannot always identify a component, because different substances can…
On the specification
- 3.3.16 Chromatography (A-level only) (page 69)