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Author Topic: Edexcel CHEMISTRY DOUBTS!!!!  (Read 254137 times)

Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1500 on: November 18, 2011, 02:08:34 pm »
Ohh then it's goot be two ,right ?
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1501 on: November 18, 2011, 07:02:24 pm »
Quote from: ~ The Golden Girl~ on November 18, 2011, 02:08:34 pm
Ohh then it's goot be two ,right ?
well I think your first trial is fine as I did it like that too
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1502 on: November 18, 2011, 07:14:04 pm »

sorry but another Q is here to tell me why it is C not B
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Offline Romeesa-Chan

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1503 on: November 18, 2011, 07:31:48 pm »
Quote from: ~ Miss Relina ~ on November 18, 2011, 07:14:04 pm
sorry but another Q is here to tell me why it is C not B
attached

The reaction is between a strong acid and a strong base.

We know that endpoint for this reaction will be 7.

Thymolphthalein gives pH range of 8.3-10.6 which is specific for our end point.

Universal indicator has a wider range of pH, look for a pH range that's more specific to the endpoint.

Hope that's cleared. (:
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1504 on: November 18, 2011, 08:39:35 pm »
Quote from: Romeesa-Chan on November 18, 2011, 07:31:48 pm
The reaction is between a strong acid and a strong base.

We know that endpoint for this reaction will be 7.

Thymolphthalein gives pH range of 8.3-10.6 which is specific for our end point.

Universal indicator has a wider range of pH, look for a pH range that's more specific to the endpoint.

Hope that's cleared. (:

Jazaki Allah Kairan my beloved  ;)

well I want to ask u about unit 6B actually I've tested myself by doing the  specimen but it really sucks  :'( :'( :-X
and when I browsed pastpapers of unit 6 they really don't help I thought that old papers  would be helpful as in last year of unit 3

so what should I do ........ :-\ :-\ as I need to be well prepared for jan  :-[
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Offline Romeesa-Chan

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1505 on: November 18, 2011, 08:52:09 pm »
Quote from: ~ Miss Relina ~ on November 18, 2011, 08:39:35 pm
Jazaki Allah Kairan my beloved  ;)

well I want to ask u about unit 6B actually I've tested myself by doing the  specimen but it really sucks  :'( :'( :-X
and when I browsed pastpapers of unit 6 they really don't help I thought that old papers  would be helpful as in last year of unit 3

so what should I do ........ :-\ :-\ as I need to be well prepared for jan  :-[
JazakAllah khairon. <3

Your giving 6B in Jan ?

Have you covered up Unit 4 and Unit 5 already ?

Well, use the notes here and after you learning these then read and go through the chemistry practical investigations.

Make sure that your concept on both Unit 4 and 5 of Chemistry is very clear. ;)

Do the papers again and again. Read the ER. The exam question pattern must be stamped into your head.

If you need anything else, please feel free to ask. ;)
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1506 on: November 19, 2011, 08:18:40 am »
Quote from: Romeesa-Chan on November 18, 2011, 08:52:09 pm
JazakAllah khairon. <3

Your giving 6B in Jan ?

Have you covered up Unit 4 and Unit 5 already ?

Well, use the notes here and after you learning these then read and go through the chemistry practical investigations.

Make sure that your concept on both Unit 4 and 5 of Chemistry is very clear. ;)

Do the papers again and again. Read the ER. The exam question pattern must be stamped into your head.

If you need anything else, please feel free to ask. ;)

yes I'll do it in Jan isA

yes but not quite well prepared I studied from that blue book of Ann fullick and seems it is not sufficient  :-[

I'll try but.........as I find some difficulties while anwsering jan  2011 so are there any resources which are covering up the syllabus or even giving hints about what the syllabus want as it's really vague..... :-\ :-\ :-\


Thanks for advice Jazaki Allah Kairan  :)
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1507 on: November 20, 2011, 06:06:08 pm »
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Offline Romeesa-Chan

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1508 on: November 22, 2011, 10:38:55 pm »
Quote from: ~ Miss Relina ~ on November 22, 2011, 05:35:24 pm
anyone plz do  reply  ???

Do you have the final answer ? :)
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Offline dk bose

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1509 on: November 24, 2011, 11:03:51 am »
hey,people!! could anyone try to solve my this doubt???the question is as follows-

(a)Aluminium is extracted by electrolysis of Al2O3.What is the maximum mass of the metal that could be obtained from 1 tonne of the oxide?
(b)If the yield of the electrolysis plant is 90%,what mass of the oxide must be used to produce 1 tonne of aluminium?
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1510 on: November 28, 2011, 04:57:06 pm »
reaction of adrenaline and hot alkaline KMno4......... ???

why the product is benzoic acid ???

anyone  :-[
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1511 on: November 29, 2011, 01:55:14 pm »
Quote from: Romeesa-Chan on November 22, 2011, 10:38:55 pm
Do you have the final answer ? :)

it's -60 Kjmol
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Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1512 on: November 29, 2011, 02:25:18 pm »
Quote from: ~ Miss Relina ~ on November 28, 2011, 04:57:06 pm
reaction of adrenaline and hot alkaline KMno4......... ???

why the product is benzoic acid ???

anyone  :-[

I've seen this QUESTION before and it made me go from this :) to this >.< :P

Anyways one sec,

firstly I'm ONLY doing Unit 4 so I've very sorry but if it's Unit 5 then I'm not the one to answer  :-\


What I know is that KMnO4 is an oxidizing agent so the Oh groups will disappear but that's all I can answer you for now.


I hope I helped =]
« Last Edit: November 29, 2011, 02:30:05 pm by ~ The Golden Girl ~ »
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Offline guMnam

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1513 on: November 29, 2011, 05:18:22 pm »
Quote from: ~ Miss Relina ~ on November 28, 2011, 04:57:06 pm
reaction of adrenaline and hot alkaline KMno4......... ???

why the product is benzoic acid ???

anyone  :-[
where did you get this question from :S
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1514 on: November 29, 2011, 05:25:35 pm »
Quote from: guMnam|The Mask on November 29, 2011, 05:18:22 pm
where did you get this question from :S
http://www.xtremepapers.com/Edexcel/Advanced%20Level/Chemistry/1997%20Jan/Question%20Paper%20Jan%201997%20Unit-4.pdf

Q5 (a) (iv)
plz tell me the steps or how it came out

and if you know how to reply to my previous post about enthalpy of reaction plz do reply

Thanks in advance  ;)  :-[
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