C2, Chemistry, Analysing Substances

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  • Created by: emmajane_
  • Created on: 11-03-14 17:18
GAS CHROMOTOGRAPHY- What is gas chromotography?
Separating mixtures on compounds
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GAS CHROMOTOGRAPHY- How is the apperatus set out?
Long glass tube, packed with powdered solid material- fitted into an oven
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GAS CHROMOTOGRAPHY- Explain stage 1 of the gas chromotography process
sample dissolved in substances- injected in
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GAS CHROMOTOGRAPHY- Explain stage 2 of the gas chromotography process
An unreactive gas (often nitrogen) is carried through the tube
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GAS CHROMOTOGRAPHY- Explain stage 3 of the gas chromotography process
Different substances travel through tube at different speeds, separating from each other
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GAS CHROMOTOGRAPHY- Explain stage 4 of the gas chromotography process
Substances leave the column- as they leave they are detected by a detector
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GAS CHROMOTOGRAPHY-What is renention time?
Time taken for substances to pass through column
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GAS CHROMOTOGRAPHY-What does the detector do?
produces a graph- each substance is a seperate peak
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GAS CHROMOTOGRAPHY-What does the number of peaks on the graph mean?
Number of compounds
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GAS CHROMOTOGRAPHY-What does the position of the peaks on the graph mean?
Renention time for each compound
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MASS SPECTROMENY- What does mass spectromeny do?
Identifies substances quickly and easily
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MASS SPECTROMENY- When a GC and MC are combined, what does it do?
Allows seperated substances leaving column to be detected
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MASS SPECTROMENY- What does mass spectromeny provide for gas chromotography?
provides a relative formula
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MASS SPECTROMENY- What is a molecular ion peak?
Furthest peak to the right in a mass spectrum
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INSTRUMENTAL ANALYSIS- WHat does it rely on?
Machines
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INSTRUMENTAL ANALYSIS-What two things does it detect?
some elements and some compounds
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INSTRUMENTAL ANALYSIS- Name 3 advantages of instrumental analysis
It's fast, accurate and sensitive
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Name the 3 methods of analysing substances
Paper chromotography, Gas chromotography and mass spectromeny
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PAPER CHROMOTOGRAPHY- What is it used for? name 3 examples
Analysing coloured substances, e.g. coloured pigments in plants and artificial colours used as food additives
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PAPER CHROMOTOGRAPHY- How does it work?
COloured substances dissolve in liquid, then bond to paper and travel further up paper
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Other cards in this set

Card 2

Front

GAS CHROMOTOGRAPHY- How is the apperatus set out?

Back

Long glass tube, packed with powdered solid material- fitted into an oven

Card 3

Front

GAS CHROMOTOGRAPHY- Explain stage 1 of the gas chromotography process

Back

Preview of the front of card 3

Card 4

Front

GAS CHROMOTOGRAPHY- Explain stage 2 of the gas chromotography process

Back

Preview of the front of card 4

Card 5

Front

GAS CHROMOTOGRAPHY- Explain stage 3 of the gas chromotography process

Back

Preview of the front of card 5
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