Karteikarten
Chromatography
Karten in diesem Stapel (8)
- 1What is chromatography?A technique used to separate and identify the components of a mixture
- 2How does chromatography work?It allows the molecules in the mixture to distribute themselves between a stationary and mobile phase
- 3What happens to more soluble molecules?They spend more time in the mobile phase and are carried up the paper faster
- 4How is chromatography used?To analyse coloured substances like dyes in food colouring or pens
- 5What is the mobile phase and what is the stationary phase?Mobile phase: the solvent eg water/alcohol
Stationary phase: the chromatography paper - 6How do you calculate Rf?Distance moved by the substance over distance moved by the solvent
- 7How are Rf values used to identify unknown substances?They are calculated and compared with Rf values in a database
- 8What two things do Rf depend on?1: The solvent used - different substances are more/less soluble in certain solvents
2: Temperature - higher temperature increases solubility
Informationen
- Beschreibung
- Year 10 Chemistry Karteikarten am Chromatography , erstellt von Saxon Channell am 18/01/2019.
- Erstellt von
- Saxon Channell
- Aufrufe
- 2
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- Erstellt von Alice Warburton · 10 Dez 2017
- Kopiert von Saxon Channell · 18 Jan 2019
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