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IG Chemistry Paper 3 discussion

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thukon:
What else?? POST SOME QUESTIONS!!!

ADIN:
man I messed up the first two parts of the first question... for the separation I initially drew a chromatography diagram and then rubbed it out  :'( and then drew fractional distillation. i hope they allow that; it didnt specify that the pigments have the same boiling point

aquarian93:
my questions:
1) why do u wash the precipitate (i sed to remove impurities, dunno it its rite)
2) why do u put it in the oven ( i sed to get it in molten state)
3) exo thingi, wt did u guys get?
4) the source of nitrogen?
5) the adv of PLA
3) prove its an acid (i said use ph Meter)

my chorophyll and Tphospate thing is rong :(
the first question was a drawing of chromatography experiment rite?

if 10-15 marks r gone, is it still an A/A*?

jeez, now this is making me depressed :(

aquarian93:
ppl cn we pls discuss :(

qwert101:

--- Quote from: qwert101 on June 02, 2009, 06:23:10 am ---i guessed, said it would contain the p043- ion. Should be one of the three marks :-\

--- End quote ---

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