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Author Topic: Edexcel CHEMISTRY DOUBTS!!!!  (Read 254143 times)

Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1485 on: November 11, 2011, 05:14:47 pm »
Quote from: Crooky :P on November 10, 2011, 03:34:33 pm
The sc parts are there to build your knowledge on that particular topic in a practical way. I dont think they come up in exam but its good to do some research about it as it might help
ok Thanks alot
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1486 on: November 11, 2011, 05:15:03 pm »
Quote from: Most UniQue™ on November 09, 2011, 04:21:09 pm
By double post , I mean posting one after another and not including them all in one post...

aha..now I understood Thanks
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Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1487 on: November 12, 2011, 09:54:50 am »
It's Q.37]d) and b) in the Unit 4 qp (if you have it please check it )


(b)   Alanine reacts with both acids and bases. Give the structural formulae of the compounds you would expect if alanine reacts with
   hydrochloric acid

– NH3 +Cl– on the amino group (1)


   sodium hydroxide

–COO– Na+ on the carboxyl group


                                                                         ....................................

d) Polyamides are made from a diacid dichloride and a diamine; they are condensation polymers.


(ii)   Suggest the structural formula of a diacid dichloride and a diamine that could be reacted to form a polyamide.



(ii)   any CIOC***COCl (1) and H2N*CH2*NH2 (1)   


 
(iii)   Draw sufficient of the polymer chain that would result from the reaction of the compounds in (ii) to make the structure of the polymer clear.




(iii)   structure consequential on answer to (ii) showing amide link (1)
and extension of the chain



 

(iv)   Alanine could be converted to CH3CH(NH2)COCl which on its own could polymerise to a polyamide. Draw the structure of the polymer chain showing three alanine repeating units and all the bonds in the amide links.


(iv)    couldn't copy it -.-




I really didn't know how to draw them =[ so someone please draw them and tell me why it turned the way you drew it, Thanks =D 
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Offline Malak

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1488 on: November 12, 2011, 12:18:44 pm »
^ Can you tell the year and month?
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Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1489 on: November 12, 2011, 12:20:12 pm »
It's old syllabus (don't know which one is it).

Relina , if you're out there and know what I'm talking about , please do reply :$

Thanks =]
« Last Edit: November 12, 2011, 12:28:38 pm by ~ The Golden Girl~ »
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Offline Galleria

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Help me answer these questions; AS Chemistry
« Reply #1490 on: November 13, 2011, 09:21:13 am »
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Offline Malak

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Re: Help me answer these questions; AS Chemistry
« Reply #1491 on: November 13, 2011, 01:41:21 pm »
Quote from: Galleria on November 13, 2011, 09:21:13 am
On reaction kinetics:
http://www.chemsheets.co.uk/AS/CHEM2.2/AS.CHEM2.2.004.pdf

On enthalpy change:
http://www.chemsheets.co.uk/AS/CHEM2.1/AS.CHEM2.1.008.pdf
http://www.chemsheets.co.uk/AS/CHEM2.1/AS.CHEM2.1.009.pdf

PLEAAAASE AND THANK YOU ^_^

I have merged your post with this thread, please post all your doubts in the specific thread from now on.
Thanks.

Kinetics:

3 (b) i - 3, its basically the same 'cause the volume is halved and conc. is doubled
     ii - Temperature is lowered so rate will decrease therefore its 4
     iii - Conc. doubles so the volume produced doubles, its curve 1
     iv - Catalyst therefore rate increases, its curve 2

(b) Do you want me to draw the graph for you?

ii - Of course, higher temperature because more molecules gain energy greater than or equal to the activation energy and therefore more successful collisions take place

iii - For a successful collision particles must collide in the correct orientation and with sufficient energy.
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1492 on: November 13, 2011, 03:32:52 pm »
Quote from: ~ The Golden Girl~ on November 12, 2011, 12:20:12 pm
It's old syllabus (don't know which one is it).

Relina , if you're out there and know what I'm talking about , please do reply :$

Thanks =]

it is not related to unit 4 I think it's from unit 5  
tell us  in which topic in examwizard u found that questions   :-\ :-\
« Last Edit: November 13, 2011, 05:59:49 pm by ~ Miss Relina ~ »
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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1493 on: November 13, 2011, 05:08:43 pm »
Turns out IT IS from Unit 5 , no wonder I thought it was weird o.O

Thanks again =]
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1494 on: November 13, 2011, 05:59:09 pm »
Quote from: ~ The Golden Girl~ on November 13, 2011, 05:08:43 pm
Turns out IT IS from Unit 5 , no wonder I thought it was weird o.O

Thanks again =]
hahahaha............fine  :P
you're welcome
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1495 on: November 16, 2011, 10:30:29 pm »
well here we go  ;)
attached
Thanks in advance
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Offline Romeesa-Chan

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1496 on: November 16, 2011, 10:45:09 pm »
I tried. Didn't get it.

Sorry. :-[

Was never good at the whole nmr thing. ::)
« Last Edit: November 16, 2011, 11:41:28 pm by Romeesa-Chan »
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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1497 on: November 17, 2011, 08:11:55 pm »
Quote from: Romeesa-Chan on November 16, 2011, 10:45:09 pm
I tried. Didn't get it.

Sorry. :-[

Was never good at the whole nmr thing. ::)


thx for trying I really appreciate it  ;)
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Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1498 on: November 18, 2011, 01:38:17 pm »
Quote from: ~ Miss Relina ~ on November 16, 2011, 10:30:29 pm
well here we go  ;)
attached
Thanks in advance

I just made a random Guess but not sure if it's right.

It says CycloHexEne and Bromine.

1 for Bromide
1 for the DOUBLE Bond since it's an alkEne
1 for the C-H

I hope I helped =]
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Offline Romeesa-Chan

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1499 on: November 18, 2011, 01:55:17 pm »
Quote from: ~ The Golden Girl~ on November 18, 2011, 01:38:17 pm
I just made a random Guess but not sure if it's right.

It says CycloHexEne and Bromine.

1 for Bromide
1 for the DOUBLE Bond since it's an alkEne
1 for the C-H

I hope I helped =]
But, it said the product of reaction between cyclohexene and bromine. :-\
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