Analysing substance

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  • Created by: chanhs
  • Created on: 26-04-17 18:21
4 ways to separate substances
Filtration. Cystalisation. Distillation. Chromatography.
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Why use filtration
Separate insoluble substances to the soluble from a solvent
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Why use crystallisation
Separate dissolved solid form a solution
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Why use distillation
Separate solvent from solution or miscible liquids with different boiling points.
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In the condenser, does water go in from bottom or top
Bottom
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2 ways of using instruments to identify unknown compounds
Paper chromatography, gas chromatography + mass spectrometer
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Used to analyse artificial colours in food or dyes in inks
Paper chromatography
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Colour move differently depending on...
Solubility
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Retention factor=
Distance a spot travel ip the paper/ distance the solvent front travels
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Disadv of using paper chromatography
Less sensitive and accurate, slower, cant detect small samples
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Disadv of using instrumental methods
Expensive, takes special training to use, only known substance can be analysed
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It is used to find relative molecular mass of a compound
Mass spectrometer
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What is retention time
The time it takes for a compound in a mixture to pass through the column during gas chromatography
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Each peak shown on the detector of a gas chromatography is
A kind of substance
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Molecular ion peak is
The peak on the mass spectrum of a substance which tells us the relative molecular mass of the substance. The peak is produced by the heaviest positive ion shown on the mass spectrum
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Other cards in this set

Card 2

Front

Separate insoluble substances to the soluble from a solvent

Back

Why use filtration

Card 3

Front

Separate dissolved solid form a solution

Back

Preview of the back of card 3

Card 4

Front

Separate solvent from solution or miscible liquids with different boiling points.

Back

Preview of the back of card 4

Card 5

Front

Bottom

Back

Preview of the back of card 5
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