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Author Topic: Edexcel CHEMISTRY DOUBTS!!!!  (Read 269091 times)

Offline NightHawkerr

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1080 on: May 20, 2011, 03:50:19 pm »
Quote from: 7d on May 20, 2011, 01:22:57 pm



well
im studying chem and i was wondering if anyone cn give me some advice on how to study organic chemistry and unit3
the problem with unit 3 is the detailed questions following the experiments
is there any site where i cn find experiments and their details and unit3 revision in general ?!
i already have the cgp revision guide...


also
in the syllabus it says :

explain why a metal halide and concentrated sulphuric acid should not be used when making a bromoalkane or an iodoalkane


treatment of haloalkanes iwth water containing dissolved silver nitrate ??


demonstrate an understanding of why it is helpful to classify reagents



help/?? i dont understand these topics any help will be appreciated
thank you so much :)




Can you please post the syllabus link here..? Thankyou.. :)
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Offline guMnam

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1081 on: May 20, 2011, 03:55:37 pm »
Quote from: ~ The Golden Girl ~ on May 20, 2011, 03:49:34 pm
free radical is  a specie that has an unpaired electron  where as -ve ion is an atom that has one less electron

I hope I helped :)
one more electron *


see the problem is tht they both have one more elctron than normal .. the way i see it ... in an ion the electron is in the orbitals... and in free radical its not :S
for eg.
cl- and .cl
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Offline Malak

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1082 on: May 20, 2011, 04:13:52 pm »
Quote from: guMnam on May 20, 2011, 03:55:37 pm
one more electron *


see the problem is tht they both have one more elctron than normal .. the way i see it ... in an ion the electron is in the orbitals... and in free radical its not :S
for eg.
cl- and .cl

They both dont have one more electron thn normal..
A negative ion is the one which has Gained one electron but
a free radical is just a specie with an unpaired electron for e.g all the halogens, they all have one unpaired electron..its not about losing or gaining electron here..
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Offline guMnam

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1083 on: May 20, 2011, 05:12:33 pm »
Quote from: ang3l on May 20, 2011, 04:13:52 pm
They both dont have one more electron thn normal..
A negative ion is the one which has Gained one electron but
a free radical is just a specie with an unpaired electron for e.g all the halogens, they all have one unpaired electron..its not about losing or gaining electron here..
.. wen something gains an electron tht means tht it has one more electron (than its ground state) ??-.-

so all molecules like Li, H ,Na , K(who have one unpaired e-)are also free radicals ?
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1084 on: May 21, 2011, 07:10:49 am »
Unit 2 Jan 2011 need Q:15 pplw
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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1085 on: May 21, 2011, 07:12:33 am »
Quote from: Relina on May 21, 2011, 07:10:49 am
Unit 2 Jan 2011 need Q:15 pplw

Attach the file.
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**RoRo**

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1086 on: May 21, 2011, 09:06:16 am »
When they ask us to draw the ionic structure of NaCl, we need to do that in 3D, right? How do you draw it? Can someone please upload a photo, or link me with one?
Thanks a lot! :)
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Offline EMO123

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1087 on: May 21, 2011, 09:17:42 am »
Quote from: The Secret on May 21, 2011, 09:06:16 am
When they ask us to draw the ionic structure of NaCl, we need to do that in 3D, right? How do you draw it? Can someone please upload a photo, or link me with one?
Thanks a lot! :)
may be like this it also works

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1088 on: May 21, 2011, 09:21:39 am »
Quote from: EMO123 on May 21, 2011, 09:17:42 am
may be like this it also works



That'd take ages for me to draw, thanks! :)
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Offline EMO123

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1089 on: May 21, 2011, 09:37:02 am »
Quote from: The Secret on May 21, 2011, 09:21:39 am
That'd take ages for me to draw, thanks! :)
oh that was easy and
glad to help
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Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1090 on: May 21, 2011, 11:53:27 am »
I've just uploaded something for the coming Unit 3 exam , check it over here  ;

https://studentforums.biz/revison-notes/useful-websites/45/ 

GG :D
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Offline Malak

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1091 on: May 21, 2011, 12:10:43 pm »
Quote from: ~ The Golden Girl ~ on May 21, 2011, 11:53:27 am
I've just uploaded something for the coming Unit 3 exam , check it over here  ;

https://studentforums.biz/revison-notes/useful-websites/45/ 

GG :D
Thx :D

Adding on one more

http://chem-ilp.net/

Great website for practical techniques
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Offline Malak

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1092 on: May 21, 2011, 12:47:49 pm »
2010 Jan Question 3d (v) and (vi)

Why is the temperature change double? There are same no. moles in both :s

Thx
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Offline NightHawkerr

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1093 on: May 21, 2011, 02:41:45 pm »
Thanks GG for the notes  :D

Does anyone have the link to AS chem Unit 3B Jan 2011? I cant seem to find it anywhere.. ;/

merci ^^
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1094 on: May 21, 2011, 03:22:46 pm »
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