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Author Topic: Edexcel CHEMISTRY DOUBTS!!!!  (Read 254126 times)

Offline Malak

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1050 on: May 15, 2011, 01:14:04 pm »
How do you draw the line on the graph?
My vertical line was at 3 min not at 3.5 as the ms says..

Its Q2 from may 2009 3b

Thx
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1051 on: May 15, 2011, 01:50:13 pm »
Quote from: ang3l on May 15, 2011, 01:14:04 pm
How do you draw the line on the graph?
My vertical line was at 3 min not at 3.5 as the ms says..

Its Q2 from may 2009 3b

Thx
as u added the i think reactant zinc or what ever at 3.5 so u should extend the line from there to get the x temp reached  :D
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Offline Malak

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1052 on: May 15, 2011, 01:58:32 pm »
Quote from: Relina on May 15, 2011, 01:50:13 pm
as u added the i think reactant zinc or what ever at 3.5 so u should extend the line from there to get the x temp reached  :D
Oh thx...Ugh i should read the question carefully :D
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Offline Assi1993

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1053 on: May 15, 2011, 03:54:38 pm »
i have a few doubts...

>whats the relation of Gibbs free energy with the solubility and spontanity of the reaction?

>in the attachment, the answer of activation energy is supposed 2 be -78kJmol^-1 but idk how its calculated!
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Offline Assi1993

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1054 on: May 15, 2011, 03:57:59 pm »
2b!!
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Offline EMO123

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1055 on: May 16, 2011, 09:23:50 am »
Quote from: Assi1993 on May 15, 2011, 03:54:38 pm
i have a few doubts...

>whats the relation of Gibbs free energy with the solubility and spontanity of the reaction?

>in the attachment, the answer of activation energy is supposed 2 be -78kJmol^-1 but idk how its calculated!
i think it is done by hess law

hope it may be right
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Offline Malak

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1056 on: May 16, 2011, 01:17:11 pm »
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Offline Aadeez || Zafar

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1057 on: May 16, 2011, 08:54:20 pm »
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Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1058 on: May 16, 2011, 09:03:20 pm »
you know the syllabus changed from 2008 , so this is not included.

P.S. sorry ,Can't help.
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Offline Malak

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1059 on: May 17, 2011, 06:05:14 pm »
Q in attachment..

Why is the answer B?
I thought that since cyclohexanol will have OH bond therefore it would dissovle in water ? :S

Thx
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Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1060 on: May 17, 2011, 08:21:40 pm »
there is no attachment.
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Offline Malak

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1061 on: May 17, 2011, 08:53:09 pm »
Oh Sorry...
Attached now...
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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1062 on: May 18, 2011, 04:43:32 am »
Quote from: ang3l on May 17, 2011, 08:53:09 pm
Oh Sorry...
Attached now...

Although, cyclohexane does have hydrogen bonds it would NOT be a very polar compound due to the massive carbon ring it contains.

Hence, it wouldnt be able to break the Hydrogen bonds between water.

Effectively, propanone is the best answer.
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Offline SkyPilotage

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1063 on: May 18, 2011, 09:43:08 am »
Quote from: Ari Ben Canaan on May 18, 2011, 04:43:32 am
Although, cyclohexane does have hydrogen bonds it would NOT be a very polar compound due to the massive carbon ring it contains.

Hence, it wouldnt be able to break the Hydrogen bonds between water.

Effectively, propanone is the best answer.
So cyclohexane is less soluble in butanone for example? cz it has more Van-der-waals so its harder to break right?
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Offline NightHawkerr

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1064 on: May 18, 2011, 08:01:34 pm »
Hi ya'll. Im doing AS Chem, and i was wondering if you guys could help me out.. What should I be studying for Unit 3 Alt. to Practical? Are there like specific experiments I should concentrate more on? & the syllabus has changed since 2008 right, that means I should only study past papers from 2009 and 2010?
 Thanks, you guys are the best  :D
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