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ALL CIE CHEMISTRY DOUBTS HERE !!

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Amelia:

--- Quote from: iluvme on May 25, 2011, 10:26:08 am ---November 2007 Paper1 Q 5, 9, 21 and 32.

Please help!

--- End quote ---

Q5 - as you know already is A.

Q9 - It's B. The 50 cm3 metal salt reacted with 25 cm3, so the oxidation state will be 1:1. The orginal oxidation state was +3, hence, the new state will be +2.

Q21 - It's A. (Ch3)4Pb, supplies methyl radicals. And we do require methyl radicals to react with chlorine to give off the products.

Q32 - It's A. All three options are right. *Carbon monoxide is a strong reducing agent because it is easily oxidised to carbon dioxide - where the oxidation state is the more thermodynamically stable +4.

iluvme:
Thanks Lia and Emo. :)

Though I yet didn't get Q9 :/

aneeta:
Does any one know where I can get chemistry past papers, paper 1 2000?

EMO123:

--- Quote from: aneeta on May 27, 2011, 12:21:49 am ---Does any one know where I can get chemistry past papers, paper 1 2000?


--- End quote ---
of Cie AS levels is it there
i dont think so


--- Quote ---Thanks Lia and Emo. Smiley

Though I yet didn't get Q9 :/
--- End quote ---
ohh i also dint get that so not posted

iluvme:
I've got more doubts, Can somebody please explain?

June 2009, Paper 1
10
11
15
18
20
29
30
38 and
40

Thank You :)

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