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    (Original post by ewjfksd)
    i got 2.86 but do you remember the questions
    The answer was 2.66g, not 2.86g
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    (Original post by SlippyDuck117)
    Did anyone else fine that exam rather difficult? I would've much preferred a paper like last year's ...

    Very few standard questions and no big nmr question too

    Been getting 50-55/60 on past papers, I don't think I've got more that 40 looking back at all the mistakes I've made.
    same
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    In my first Chemistry exam I was wearing novelty Christmas socks. They accidentally went off playing Christmas tunes. The examiner had to confiscate my socks.
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    (Original post by anndz3007)
    where do you put the charge on A ?? i thought nothing break down so i just leave it neutral ??
    In ms the particles are ionised and so the 'species' detected are always positive aren't they?
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    (Original post by lai812matthew)
    1. oh nh doesn't split 2. d2o is used
    i dont mean the spliting pattern, i mean the chemical shift value splitting was 2 doublet and 1 multiplet right ?
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    Can someone confirm, is the first answer saturated fat or the other unsaturated ones??
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    (Original post by SlippyDuck117)
    Did anyone else fine that exam rather difficult? I would've much preferred a paper like last year's ...

    Very few standard questions and no big nmr question too

    Been getting 50-55/60 on past papers, I don't think I've got more that 40 looking back at all the mistakes I've made.
    i agree and i think i got about 40 marks as well :/
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    Could you say that a use for polyamides is to make plastics?
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    (Original post by Michaelj99)
    Does it have to have the methyl?! I just did it as straight pentanone :/
    Because it is the only isomer with 4 carbon environments
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    (Original post by Hunnybeebee)
    I feel the exact same. Actually though 2015 was easy but this was awful

    Posted from TSR Mobile
    Exactly!

    NMR is like my specialty man, I got 6/7 on last years question because I didn't comment on the N-H peak!
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    (Original post by Hunnybeebee)
    I feel the exact same. Actually though 2015 was easy but this was awful

    Posted from TSR Mobile
    At least I'm not alone in thinking this! I'm hoping for full UMS on F325, I really need it after that terrible unit 4.
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    (Original post by anndz3007)
    i dont mean the spliting pattern, i mean the chemical shift value splitting was 2 doublet and 1 multiplet right ?
    ?yeah
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    For the polyamide question, was it a use of NYLON specifically or any polyamide?
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    (Original post by selenmer)
    Could you say that a use for polyamides is to make plastics?
    yep, nylon is a polyamide and is a plastic, so that should get you the mark
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    (Original post by popo111)
    Can someone confirm, is the first answer saturated fat or the other unsaturated ones??

    I wrote the one with 2 double bonds purely becuase it leads to more trans structures?
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    (Original post by adnan_ja01)
    for the equation of the reduction of the aldehyde to alcohol, would putting OH- as a second product be fine?
    no
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    (Original post by FluffyCommie)
    yep, nylon is a polyamide and is a plastic, so that should get you the mark
    OMG THANK YOU SO MUCH )) that has made me so much happier, i know its only one mark but one mark can make all the difference
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    (Original post by JennyMoorcroft)
    My friend wrote his structures in pencil, will the pencil pick up for marking?
    The invigilators always say 'pencils may be used for drawings and rough notes' so I should assume so! (i go over mine in pen afterwards though bc I worry)

    (Original post by Spwoosh)
    It wouldn't be branched at all, everybody just got a little over excited and over complicated it. It's literally ch3ch2ch2ch(oh)ch3. CNMR peaks are the distance of the carbons from the electronegative point. The Ch2 next to the Ch(oh) will have the same peak as the Ch3 on the other end of the Ch(oh) so there are only 4 peaks. We were right. The answer most people got was wrong because if you look at it carefully you'd see it only has 3 peaks.
    I don't think thats right? (CH3)2CHCH(OH)CH3 would give 4, not 3 peaks, as the two methyl groups are in identical environments.
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    (Original post by faglad202)
    I wrote the one with 2 double bonds purely becuase it leads to more trans structures?
    Yeah that's what I thought, but apparently it said that trans fats aren't naturally occuring and the fats were naturally occuring, so apparently they were cis??

    I know it's only like 1 mark lol, but as the first question it bloody well did trip me!
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    For the first step of the incomplete mechanism question (2 marks),

    I just put positive dipole on the carbon and negative dipole on the oxygen.
    And a curly arrow going from the double bond to the oxygen.

    Did we have to draw the OH- attacking the carbon with a curly arrow as well?
 
 
 
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