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IG Chemistry Paper 3 discussion

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posten:

--- Quote ---what was the answer for chorophyll?
--- End quote ---
-do chromatography for the cholorophyll sample and compare the results with the one drawn above it will give one spot matching with the same height in both.

thukon:

--- Quote from: LoCo93 on June 02, 2009, 01:42:54 pm ---i rote sumthin like add a magneisum (or any metal) ribbon and if its acidic it'll react..  ??? ??? ::) dont kno tho..

--- End quote ---
But GUYS.... the question asked how you could determine the compounds contained the same COOH group!! Just because it reacts with a base or a carbonate wont tell that its a COOH group.

aquarian93:
u guys, i drew a chormatography diagram for the first, its okay rite?
for the energy thing i got -530
for the adv of PLA i rote, its non biodegradable and wont pollute the environment wen burnt with harmful gases (CO2) :S
the source for nitrogen, i said nitrogen fixation bacteria :(
i said we wash the precipitate to remove impurities
and put it in the oven to get it in molten state if needed

cn anyone pls verify my answers..?

the question after the limiting agent one, was how much of mass of SiF was collected rite? i forgot
by the look of it, i think i lost 10-15 marks :(
does anyone, by any chance noe if that cn still be an A/A*

i thoght the paper was too long, we usually get 7 questions. and it was a whole lotta math/bio, weird.

bibo the wa7sh:
heY everYone,
wat about electrolysis of dilute sodium chloride???
Cathode..........
anode..............
and wat happens to the electrolyte???.....
WaiTinG 4 uR RepLies!!xD!! :o

ETCH:
at the cathode hydrogen is produced, at the anode oxygen is produced and the electrlyte becomes more concentrated.

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