Official AQA GCSE Chemistry Unit 2 24th Janurary NEW SPEC Watch
Heres my 6-mark GC-MS answer.
The sample is vaporised. An unreactive carrier gas is injected which carries the sample through the coiled column. The compounds in the sample have different forces of attraction to the solid material in the column walls, meaning they will move through the column at different speeds. The compounds will have a different retention time. When the compounds reach the detector, a chart (chromatograph) is plotted. The mass spectrometer draws a mass spectrum which corresponds to the molecular mass number and percent abundance of the compounds.
+substance seperates and leaves at different times
+ also know why this is useful/downsides
Haha well I'd recommend myGCSEscience videos on youtube, just been making my way through all the C2 videos after only just discovering him!
I reckon it'll be a mix of everything to be honest, with lots of calculations thrown in! And after the biology, I think the 6 marker's likely to be something fairly unpredictable! Definitely think GC-MS and electrolysis will come up somewhere though
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June 2012 paper for New spec! :
QP - http://science.taskermilward.org.uk/...une 2012 H.pdf
MS - Can't find one, sorry!
I just types in paper code now and it came up!
I think we do my teacher recommended that we recap it use this web site http://www.bbc.co.uk/schools/gcsebit...ysisrev3.shtml
EDIT: Someone negged me, sorry if I'm wrong! I'm just looking through the spec now, doesn't mention purification of copper anywhere!