Edexcel IAL, Unit 5: Transition Metals and Organic Nitrogen Chemistry. 22-Jun-2016

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Can anyone plx tell me that if a reaction has a positive total entropy will it be feasible even if the activation energy is very high bcux ik Enthalpy does not determine spontaneity cux reactants can be kinetically very stable. Does the same apply to Total entropy???

Reply 81

sabahshahed294

Original post by All rounder

It can be made feasible by changing the temperature or by lowering the activation energy otherwise it won't take place even if the total entropy is positive.

Reply 82

Mehodax

All the best guys for Unit 6 tomorrow!

Be sure to check the pastpapers.

Reply 83

dnac5

Hii,

Does anybody know of a chemistry A2 group IAL. Im really looking forward to joining one .
Ty :smile:

Reply 84

Aimen.

Original post by dnac5

Hii,

Does anybody know of a chemistry A2 group IAL. Im really looking forward to joining one .
Ty :smile:

http://www.thestudentroom.co.uk/showthread.php?t=4079863&page=10&p=64853927

Reply 85

Leen.A1998

Original post by All rounder

If s total is positive then the reaction is feasible/spontaneous, but sometimes the reaction will not occur even s total is positive since the activation energy is very high so we say that the reaction is kinetically inert.

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Reply 86

sabahshahed294

Hi! Is there any thread for Physics Unit 4 and Unit 5 for June 2016 Exams?

Reply 87

DonPedrodoc

Does anyone understand why the answer to 10 a is B. I've got no clue.

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Reply 88

dpoojaraa

Original post by DonPedrodoc

Does anyone understand why the answer to 10 a is B. I've got no clue.

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Can't see the image for some reason.. can you post it again pls?

Reply 89

Mehodax

Original post by DonPedrodoc

Does anyone understand why the answer to 10 a is B. I've got no clue.

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The attachment is invalid so unable to view it

Reply 90

DonPedrodoc

Sorry about that. Question 10a

http://qualifications.pearson.com/content/dam/pdf/A%20Level/Chemistry/2013/Exam%20materials/6CH04_01_que_20120307.pdf

Reply 91

thymolphthalein

Original post by DonPedrodoc

Sorry about that. Question 10a

http://qualifications.pearson.com/content/dam/pdf/A%20Level/Chemistry/2013/Exam%20materials/6CH04_01_que_20120307.pdf

I answered 10 B at first, oops. :colonhash:

My Chem is a bit rusty now, but from what I've learnt, all aldehydes (except methanal) AND unsymmetric ketones form racemic mixtures as they form products with a chiral carbon.

B is the only symmetric ketone (C2H5 on either side of the C=O) and your final product would not have a chiral carbon and the mixture would not be racemic.

Reply 92

thymolphthalein

And if anyone's interested, I might make Unit 4 notes on some of the larger topics similar to the notes I've made for Unit 5. (I posted them earlier on this thread). :smile:

Reply 93

PlayerBB

Original post by thymolphthalein

And if anyone's interested, I might make Unit 4 notes on some of the larger topics similar to the notes I've made for Unit 5. (I posted them earlier on this thread). :smile:

Yeah, that would be great!! And thank you :h:

Reply 94

sabahshahed294

Original post by thymolphthalein

And if anyone's interested, I might make Unit 4 notes on some of the larger topics similar to the notes I've made for Unit 5. (I posted them earlier on this thread). :smile:

Yes that would be helpful! Thank you! :smile:

Reply 95

Aimen.

Original post by thymolphthalein

And if anyone's interested, I might make Unit 4 notes on some of the larger topics similar to the notes I've made for Unit 5. (I posted them earlier on this thread). :smile: