Edexcel Chemistry Unit 1 IAL (WCH01) Core principles of chemistry - 23rd May 2014 Watch

Fattyma97
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The first question was also included :lolwut: how on earth did u find out about it!!!!
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Ripper Phoenix
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#122
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(Original post by Fattyma97)
The first question was also included :lolwut: how on earth did u find out about it!!!!
i dont even know! i was just googling the c6h13br question and came across it!
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Fattyma97
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Woahhh ur good.. seems like they may also use it for unit 2 chem. Never thought of solving other exam boards other than edexcel, thanks for notifying us!
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saifulahmed
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(Original post by hhalai96)
isn't bond enthalpy values positive?
yah but their value was negative.
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hhalai96
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(Original post by Paras Agarwal)
see question 6 and 15 here!!! http://www.docstoc.com/docs/11915013...es-and-Alkenes


the last question was kinda hard
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hhalai96
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(Original post by saifulahmed)
yah but their value was negative.


so would it be wrong if you kept your answer as a positive one ?
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hhalai96
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(Original post by hhalai96)
the last question was kinda hard

what were the answers in that document of question 6 and 15 ?
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samakawg
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I wrote irritant :P I actually had an experience xP
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samakawg
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(Original post by avishyaa)
would it be right to say that the hazard related to hydrogen bromide is that it's toxic/poisonous?
I wrote irritant :P I actually had an experience xP
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saifulahmed
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(Original post by hhalai96)
so would it be wrong if you kept your answer as a positive one ?
i don really know. the value they gave was enthalpy change of reaction. may be the reaction was exothermic, and the bond energy might be positive. now i'm thinking positive might be correct cause the question was for 2 marks. so may be you are correct!
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hhalai96
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what was the answer for the last question on ionisation...



i wrote about the ionisation increases as electrons are removed but there is a big jump from 6 to 7...
this shows that the 7th and 8th electron are next to the nucleus and the rest are in another shell.. this shows that oxygen atom has electrons filled in the 2 electron shells only
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Ripper Phoenix
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(Original post by hhalai96)
what was the answer for the last question on ionisation...



i wrote about the ionisation increases as electrons are removed but there is a big jump from 6 to 7...
this shows that the 7th and 8th electron are next to the nucleus and the rest are in another shell.. this shows that oxygen atom has electrons filled in the 2 electron shells only
lol didnt u see my post?? the questions are in that paper with mark scheme
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hhalai96
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(Original post by Paras Agarwal)
MARK SCHEME
https://www.google.com/search?q=ocr+...sm=93&ie=UTF-8

OPEN FIRST LINK! SCROLL DOWN!!! CHECK FOR THE C6H13BR QUESTION!!

scroll down to page 17.. few questions there also
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Fattyma97
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Why is it positive :eek::eek::eek::eek:

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hhalai96
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(Original post by Fattyma97)
Why is it positive :eek::eek::eek::eek:

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because its bond enthalpy... endothermic reaction breaking of bonds....
the enthalpy change given was for enthalpy of reaction ....
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hhalai96
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(Original post by hhalai96)
scroll down to page 17.. few questions there also


Thats 38 marks from OCR ...
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Lorri97
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(Original post by hhalai96)
because its bond enthalpy... endothermic reaction breaking of bonds....
the enthalpy change given was for enthalpy of reaction ....

Yeah but they will probably just say ignore sign in the mark scheme as they usually do... the important part of the question was the calculation not the sign lol
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Ripper Phoenix
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i wish i hadnt stumbled upon the mark scheme!! grrrrr!!
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samakawg
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(Original post by Paras Agarwal)
i wish i hadnt stumbled upon the mark scheme!! grrrrr!!
Lol jobless fellow xP
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Vivekmaj
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The question about "why do the CIS and TRANS isomers form the same product" which is in the MSc, my answer is different I wrote "they are geometric isomers and hence originate from hexene this give the same product at the end"
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