C2, Chemistry, Analysing Substances 0.0 / 5 ? ChemistryAnalysing substancesGCSEAQA Created by: emmajane_Created on: 11-03-14 17:18 GAS CHROMOTOGRAPHY- What is gas chromotography? Separating mixtures on compounds 1 of 20 GAS CHROMOTOGRAPHY- How is the apperatus set out? Long glass tube, packed with powdered solid material- fitted into an oven 2 of 20 GAS CHROMOTOGRAPHY- Explain stage 1 of the gas chromotography process sample dissolved in substances- injected in 3 of 20 GAS CHROMOTOGRAPHY- Explain stage 2 of the gas chromotography process An unreactive gas (often nitrogen) is carried through the tube 4 of 20 GAS CHROMOTOGRAPHY- Explain stage 3 of the gas chromotography process Different substances travel through tube at different speeds, separating from each other 5 of 20 GAS CHROMOTOGRAPHY- Explain stage 4 of the gas chromotography process Substances leave the column- as they leave they are detected by a detector 6 of 20 GAS CHROMOTOGRAPHY-What is renention time? Time taken for substances to pass through column 7 of 20 GAS CHROMOTOGRAPHY-What does the detector do? produces a graph- each substance is a seperate peak 8 of 20 GAS CHROMOTOGRAPHY-What does the number of peaks on the graph mean? Number of compounds 9 of 20 GAS CHROMOTOGRAPHY-What does the position of the peaks on the graph mean? Renention time for each compound 10 of 20 MASS SPECTROMENY- What does mass spectromeny do? Identifies substances quickly and easily 11 of 20 MASS SPECTROMENY- When a GC and MC are combined, what does it do? Allows seperated substances leaving column to be detected 12 of 20 MASS SPECTROMENY- What does mass spectromeny provide for gas chromotography? provides a relative formula 13 of 20 MASS SPECTROMENY- What is a molecular ion peak? Furthest peak to the right in a mass spectrum 14 of 20 INSTRUMENTAL ANALYSIS- WHat does it rely on? Machines 15 of 20 INSTRUMENTAL ANALYSIS-What two things does it detect? some elements and some compounds 16 of 20 INSTRUMENTAL ANALYSIS- Name 3 advantages of instrumental analysis It's fast, accurate and sensitive 17 of 20 Name the 3 methods of analysing substances Paper chromotography, Gas chromotography and mass spectromeny 18 of 20 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 19 of 20 PAPER CHROMOTOGRAPHY- How does it work? COloured substances dissolve in liquid, then bond to paper and travel further up paper 20 of 20
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