20,345
edits
Changes
→About Chromatograms
==Key Stage 3==
===Meaning===
[[File:ChromatographyDiagram2.png|right|300px|thumb|The [[chromatogram]] is on the far right having been produced in a [[chromatography]] [[experiment]].]]
A [[chromatogram]] is the result of a [[chromatography]] [[experiment]] showing the relative [[distance]]s moved by different [[chemical]]s in a [[sample]].
===About Chromatograms===
[[Chromatogram]]s can be used to identify [[chemical]]s in an unknown [[mixture]] because different [[solute]]s [[diffusion|diffuse]] at different rates.
==Key Stage 4==
===Meaning===
*Comparing the [[chromatogram]] of a [[sample]] to the [[chromatogram]]s of known [[chemical]]s.
*Calculating the [[Retention Factor|Retention Factor (R<sub>f</sub>)]] of the [[chemical]]s in the [[sample]] and comparing it to known [[Retention Factor|R<sub>f</sub>]] values.
: [[Chromatography]] works because different [[solute]]s [[diffusion|diffuse]] at different rates.
===References===
====OCR====
:[https://www.amazon.co.uk/gp/product/17829456950198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=17829456950198359829&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 90e8d7b4f039d53035238fa0320fe00b ''ChromatographyChromatograms, pages 102, 10346-49, Gateway GCSE Combined Science; The Revision GuideChemistry, CGPOxford, OCR '']