8CH02 Paper 2 EDEXCEL CHEMISTRY Friday 10th June 2016

Original post by clairebear101

i swear it was a dehydrated Di-ol

Dehydration would be going from an alcohol to an alkene, but this was oxidisation of the alcohol to a carboxylic acid. I think :P

Reply 42

iasilva

hmm... I sat for the same paper, but the questions seem different. Was there a weird Iodine monochloride titration question in Section C of your paper?

Reply 43

Astro_Joe

1

Original post by Florent venhari

It was the reaction of carboxylic acid which made something else which had a -diol and 2 double oxygen bonds ....... So it couldn't be K2Cr2O7 because that's for oxidation of an alcohol to form a carboxylic acid

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Actually, now that I remember, it was the reaction of a diol to form a dicarboxylic acid. Which I think does react in that way.

Reply 44

Original post by Florent venhari

It was the reaction of carboxylic acid which made something else which had a -diol and 2 double oxygen bonds ....... So it couldn't be K2Cr2O7 because that's for oxidation of an alcohol to form a carboxylic acid

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yeah i rushed and just saw a double bond and thought it was dehydration ;/ will i get a mark for saying heat under reflux? :/

Reply 45

who else got that that for one of the first questions there ere nly 3 ismoers? and who else got -77.2 for hess cycle?

Reply 46

OP

Original post by clairebear101

who else got that that for one of the first questions there ere nly 3 ismoers? and who else got -77.2 for hess cycle?

I got a positive number in the 70s ?? See, i didn't know which way the arrows were supposed to go so I did it like it was a formation reaction

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Reply 47

Original post by Florent venhari

I got a positive number in the 70s ?? See, i didn't know which way the arrows were supposed to go so I did it like it was a formation reaction

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hmm i put both the arrows down wards and so did a few others i know as well but i dunno

Reply 48

OP

Original post by clairebear101

who else got that that for one of the first questions there ere nly 3 ismoers? and who else got -77.2 for hess cycle?

I got all 4 but Im not sure if they're correct:

1) CH3-CH2-CH2-CH2-CH2(OH)

2) CH3-CH2-CH(CH3)-CH2(OH)

3) (CH3)3-C-CH2(OH)

4) (OH)CH2-CH2-CH(CH3)-CH3

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Reply 49

Original post by Florent venhari

I got all 4 but Im not sure if they're correct:

1) CH3-CH2-CH2-CH2-CH2(OH)

2) CH3-CH2-CH(CH3)-CH2(OH)

3) (CH3)3-C-CH2(OH)

4) (OH)CH2-CH2-CH(CH3)-CH3

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tbh i cant emeber if i got 4 now, oh well only 1 mark, more the other questions i am worried aobut! what did everyone put for the praticals

Reply 50

OP

What did people get for question 2 (a). It was to name the E/Z isomer. I think I put A

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Reply 51

I think it was the D because the higher priority groups were on the same side and the groups on either side with different so it had to be Z-...
I think, correct me if I'm wrong

Reply 52

OP

Original post by zak_121

I think it was the D because the higher priority groups were on the same side and the groups on either side with different so it had to be Z-...
I think, correct me if I'm wrong

ImageUploadedByStudent Room1465578953.406445.jpg

Here's the drawing of it

I swear A was Z-2-bromo-1-chloroprop-1ene ????

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Reply 53

OP

Did the Chlorine in question one have a sigma bond right? And it was homolytic fission????

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Reply 54

blueangel328

8

Is there a thread for the 6CH02 paper edexcel?

Reply 55

Original post by Florent venhari

Here's the drawing of it

I swear A was Z-2-bromo-1-chloroprop-1ene ????

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Yh it was that I can't remember the letter😂
I remember D for one of the questions tho

Reply 56

How did you find the whole paper in general, how many marks do you think you got?

Original post by Florent venhari

Did the Chlorine in question one have a sigma bond right? And it was homolytic fission????

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I got that too

Reply 57

OP

Original post by zak_121

Yh it was that I can't remember the letter😂
I remember D for one of the questions tho

I think D was the one before it! 🤗🤗🤗The sigma bond and homolytic fission for the Cl2

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Reply 58

OP

Anyone know the answer, I think to the dehydrating agent multiple mark question? I think I put Na2SO4, which was D? I can't remember the options. I just remember reading that H2SO4 is a good dehydrating agent in a book and Na2SO4 seems similar?????????

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Reply 59