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Author Topic: ALL CIE CHEMISTRY DOUBTS HERE !!  (Read 122961 times)

Offline Arthur Bon Zavi

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #540 on: May 17, 2011, 12:11:34 pm »
Pretty easy it was.
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Offline TJ-56

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #541 on: May 19, 2011, 04:44:43 pm »
Regarding the E(cell) values, how do we know if a reaction can occur or not? For example: mj02, q4(c): (i)no reaction occurs, well how can we decide so? and (ii) a reaction occurs. Is there like a 'least value of an E(cell) of a reaction to occur'?. And also, can someone please explain which value we subtract from which in calculating this E(cell) value? I notice sometimes in every paper its different and I have found it really confusing.
Thanks in advance and I really appreciate the help.
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Offline EMO123

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #542 on: May 19, 2011, 04:48:59 pm »
Quote from: TJ-56 on May 19, 2011, 04:44:43 pm
Regarding the E(cell) values, how do we know if a reaction can occur or not? For example: mj02, q4(c): (i)no reaction occurs, well how can we decide so? and (ii) a reaction occurs. Is there like a 'least value of an E(cell) of a reaction to occur'?. And also, can someone please explain which value we subtract from which in calculating this E(cell) value? I notice sometimes in every paper its different and I have found it really confusing.
Thanks in advance and I really appreciate the help.

which year or which variant
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Offline TJ-56

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #543 on: May 19, 2011, 04:53:07 pm »
Quote from: EMO123 on May 19, 2011, 04:48:59 pm
which year or which variant
Thanks for trying to help. Well I just posted an example: May June 2002 Paper 4 Q4 (c), but as I wrote I found the topic a bit confusing.
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Offline EMO123

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #544 on: May 19, 2011, 04:53:57 pm »
Quote from: TJ-56 on May 19, 2011, 04:53:07 pm
Thanks for trying to help. Well I just posted an example: May June 2002 Paper 4 Q4 (c), but as I wrote I found the topic a bit confusing.
its k i will try to do that
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Offline aldehyde1612

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #545 on: May 19, 2011, 06:19:17 pm »
I do NOT understand mass spectrometry and that resonance thing??
can someone explain? .. like how we're supposed to do question 3.d. from May 2010 p42.
ANY helps appreciated.


***Thanks for the overwhelming amount of help you guys gave. lol jokes. i figured it out myself.
« Last Edit: May 21, 2011, 03:10:46 pm by aldehyde1612 »
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Offline TJ-56

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #546 on: May 20, 2011, 04:14:47 pm »
Ok I have another question regarding the E(cell) topic.
In October November 2005 Paper 4 Question 3 (c) (i): I got the H2O2 part, but not the KI. How do we know which to use: the K+ or I- half equation? This may be silly, but I am a bit confused :S
Thanx in  adv
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Offline da_rockstar

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #547 on: May 21, 2011, 05:09:02 pm »
guys can anyone explain why whether fluorinated compounds are hydrophobic or hydrophilic?
cuz i was going through the application booklet...and i saw in oil slick part that they use fluorinated molecules to repel water and absorb oil in sorbent boom.
but i had doubts over it since as far as i remember fluorine forms the strongest hydrogen bonds doesn't it?
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Offline leebux101

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #548 on: May 21, 2011, 10:01:10 pm »
URGENT
for those who are doing A2 this year, do we have to revise the AS stuff as well???
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Offline Arthur Bon Zavi

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #549 on: May 21, 2011, 10:11:19 pm »
Quote from: leebux101 on May 21, 2011, 10:01:10 pm
URGENT
for those who are doing A2 this year, do we have to revise the AS stuff as well???

Definitely.
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Offline TJ-56

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #550 on: May 21, 2011, 10:16:07 pm »
Quote from: Fidato on May 21, 2011, 10:11:19 pm
Definitely.

All of the topics?
I mean I have solved all papers from 2002 till 2010, but there are many AS topics that are not mentioned or required for the A2.
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Offline leebux101

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #551 on: May 21, 2011, 10:32:13 pm »
Quote from: TJ-56 on May 21, 2011, 10:16:07 pm
All of the topics?
I mean I have solved all papers from 2002 till 2010, but there are many AS topics that are not mentioned or required for the A2.
yeah i agree with TJ-56, "definitely" is the wrong answer.... for sure.
theres about 5 marks in total only for AS organic Chem, is anybody studying AS organic then?
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Offline Arthur Bon Zavi

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #552 on: May 21, 2011, 10:38:27 pm »
Quote from: leebux101 on May 21, 2011, 10:32:13 pm
yeah i agree with TJ-56, "definitely" is the wrong answer.... for sure.
theres about 5 marks in total only for AS organic Chem, is anybody studying AS organic then?

He didn't mention all topics, he mentioned AS topics. If I would have been there, I would revise all the AS topics atleast once.
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Offline TJ-56

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #553 on: May 21, 2011, 11:29:59 pm »
Quote from: Fidato on May 21, 2011, 10:38:27 pm
He didn't mention all topics, he mentioned AS topics. If I would have been there, I would revise all the AS topics atleast once.

Maybe it's best if we did so, but to be honest, it's easier said than done, plus, paper 4 is just a few days away and hence there's barely enough time to go through the past papers.
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Offline leebux101

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Re: ALL CIE CHEMISTRY DOUBTS HERE !!
« Reply #554 on: May 21, 2011, 11:37:13 pm »
yeah ur ryt fidato, but as Tj-56 said, theres barely time to revise all of A2 chem... i guess i will go over some AS organic chem though...
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