Difference between revisions of "Chromatogram"
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| + | ==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]]. | ||
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| + | ===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== | ||
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==Key Stage 4== | ==Key Stage 4== | ||
===Meaning=== | ===Meaning=== | ||
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*Comparing the [[chromatogram]] of a [[sample]] to the [[chromatogram]]s of known [[chemical]]s. | *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. | *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=== | ===References=== | ||
Revision as of 17:20, 23 February 2022
Contents
Key Stage 3
Meaning
A chromatogram is the result of a chromatography experiment showing the relative distances moved by different chemicals in a sample.
About Chromatograms
Chromatograms can be used to identify chemicals in an unknown mixture because different solutes diffuse at different rates.==Key Stage 4==
Key Stage 4
Meaning
A chromatogram is the result of a chromatography experiment showing the relative distances moved by different chemicals in a sample.
About Chromatograms
Chromatograms can be used to identify chemicals in an unknown mixture by:
- Comparing the chromatogram of a sample to the chromatograms of known chemicals.
- Calculating the Retention Factor (Rf) of the chemicals in the sample and comparing it to known Rf values.
- Chromatography works because different solutes diffuse at different rates.
References
AQA
Edexcel
- Chromatogram, page 152, GCSE Combined Science, Pearson Edexcel
- Chromatogram, page 8, GCSE Chemistry, Pearson, Edexcel
- Chromatograms, page 40, GCSE Chemistry; The Revision Guide, CGP, Edexcel
- Chromatograms, pages 108, 109, 111, GCSE Chemistry, CGP, Edexcel