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Author Topic: CHEMISTRY PAPER 1 HERE  (Read 38361 times)

Offline shafiq_92libra

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Re: CHEMISTRY PAPER 1 HERE
« Reply #345 on: June 12, 2009, 04:02:53 am »
wat is an oxidation state??? i hhave no ide, i never paid attention in class when da teacher was teaching us ><, is it da same as valency??
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Offline kam

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Re: CHEMISTRY PAPER 1 HERE
« Reply #346 on: June 12, 2009, 04:10:40 am »
Quote from: shafiq_92libra on June 12, 2009, 04:02:53 am
wat is an oxidation state??? i hhave no ide, i never paid attention in class when da teacher was teaching us ><, is it da same as valency??

you can say tht yes
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Offline amy.mym

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Re: CHEMISTRY PAPER 1 HERE
« Reply #347 on: June 12, 2009, 04:12:17 am »
thanks guys I owe u

REP+ for angell
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Offline shafiq_92libra

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Re: CHEMISTRY PAPER 1 HERE
« Reply #348 on: June 12, 2009, 04:15:39 am »
thnnxx =D
and guys this question made no sense to me at all
ryt 2004 nov
question 11

11. A substance X is heated in an evaporating basin until there is no further change.
mass of basin and contents
before heating 25.52 g
after heating 26.63 g
What could X be?
A copper
B copper(II) carbonate
C copper(II) oxide
D hydrated copper(II) sulphate

da answer is a bt i hav no idea why
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Offline kam

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Re: CHEMISTRY PAPER 1 HERE
« Reply #349 on: June 12, 2009, 04:23:26 am »
Quote from: shafiq_92libra on June 12, 2009, 04:15:39 am
thnnxx =D
and guys this question made no sense to me at all
ryt 2004 nov
question 11

11. A substance X is heated in an evaporating basin until there is no further change.
mass of basin and contents
before heating 25.52 g
after heating 26.63 g
What could X be?
A copper
B copper(II) carbonate
C copper(II) oxide
D hydrated copper(II) sulphate

da answer is a bt i hav no idea why

luk, u heat the copper and forms copper 2 oxide
which is a black powder
so mass increases
it cant be the others cuz they all give out  either a gas or water or somat
gettit?
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Offline shafiq_92libra

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Re: CHEMISTRY PAPER 1 HERE
« Reply #350 on: June 12, 2009, 04:43:12 am »
yea  :D
Thanks
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Offline Petrol

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Re: CHEMISTRY PAPER 1 HERE
« Reply #351 on: June 12, 2009, 05:28:40 am »
Quote from: madee on June 11, 2009, 07:18:08 pm
Quote from: nid404 on June 11, 2009, 07:14:03 pm
Quote from: Petrol on June 11, 2009, 07:11:09 pm
can u explain further ... and please are u 100%?

yes im 100% sure. See when the two react, KOH is in excess..it still remains in the solution after the reaction is over. The pH of the solution increases as the alkali is in excess. I've tried my best to explain it.
luk man der is no other possibility by which the pH can increase so its simple tht KOH is in excess

oo thanks i get it now :)
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Offline susman

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Re: CHEMISTRY PAPER 1 HERE
« Reply #352 on: June 12, 2009, 05:38:10 am »
any gave the paper?
how was it?
easy or hard?
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Offline 3bood

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Re: CHEMISTRY PAPER 1 HERE
« Reply #353 on: June 12, 2009, 08:15:59 am »
i did it
it was so easy
only 2-4 questions were tricky
and the rest of the exam was easy
good luck for all
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Offline leebux101

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Re: CHEMISTRY PAPER 1 HERE
« Reply #354 on: June 12, 2009, 08:34:58 am »
easy paper....and yeah only a couple of questions were tricky....dont freak out and just calm down...ok...good luck
and i am done with papers...(momentarily cuz i am giving more in november).....YAYY!!!!!!!!!!!!
 ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D
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Offline shafiq_92libra

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Re: CHEMISTRY PAPER 1 HERE
« Reply #355 on: June 12, 2009, 09:47:26 pm »
it wwasss soooo easyyy xDDD
i was only confused about da last question
as memory serves da answer shudve been naphta bt der was no choice ><
but i put paraffin =D
wich i think is ryt
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Offline Fibonacci

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Re: CHEMISTRY PAPER 1 HERE
« Reply #356 on: June 12, 2009, 10:29:01 pm »
naphta is actually used for a feedstock por plastics i think. so it was parafin, also named kerosene
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Offline Christy

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Re: CHEMISTRY PAPER 1 HERE
« Reply #357 on: June 13, 2009, 05:32:16 am »
no the last answer is A :P :P
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Offline therealhyebyekadal

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Re: CHEMISTRY PAPER 1 HERE
« Reply #358 on: June 13, 2009, 06:22:08 am »
what was the last question??
and anyway for the question on aircraft fuel its definately paraffin theres a exact same
past question
like this and then i had looked at  my text and it said that parrafin=kerosine
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PEOPLE this is hyebyekadal (LOST old pass)
Heres papers for edexcel and CIe (2000-2008)( some also have 1993)
Chem:http://uploading.com/files/YV3SJA73/Chemistry.rar.html

Offline MR.BooMBastiC

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Re: CHEMISTRY PAPER 1 HERE
« Reply #359 on: June 13, 2009, 11:18:49 am »
they even gav da clue...that its used in aircraft........
so its paraffin/kerosine 
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