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OCR A2 CHEMISTRY F324 and F325- 14th and 22nd June 2016- OFFICIAL THREAD watch

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    (Original post by rory58824)
    Something to do with why it dissolves, I began talking about blood but I think that's wrong. The ketone was 4 straight carbons with a methyl group in there as well if I can remember
    Dissolves because it can make hydrogen bonds with water surely? due to -OH group?
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    (Original post by 5824)
    Do you think you'd get error carried forward for the CNMR boxes?
    Yeah it will be
    3 for finding H
    1 for structure of H
    1 for F
    1 for G

    and then 1 for what you got for your H and what you got for your F to get the structure of I
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    I got 2.61 too! I think we used 60% instead of 61%, hopefully we'll get a couple marks though
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    (Original post by milutin767)
    what was that thing for lactic acid in bacteria/by chemical synthesis? i said something about getting a pure product rather than a mixture of products...
    I wrote about optical isomers but I'm not sure
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    (Original post by mattyk5)
    Dissolves because it can make hydrogen bonds with water surely? due to -OH group?
    Yes I had that in my mind, but water on the skin? Sweat? I don't know, it just didnt make sense to me lol.
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    GUYS, you know the tripeptide question, do you draw unit repeat format or a normal tripeptide with carboxylic acid and amine at either end?? (I did both)
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    (Original post by Lion2121)
    Yeah it will be
    3 for finding H
    1 for structure of H
    1 for F
    1 for G

    and then 1 for what you got for your H and what you got for your F to get the structure of I
    So for getting the alcohol structure wrong, you'd lose 3 marks?
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    (Original post by maisym00)
    I wrote about optical isomers but I'm not sure
    Chemical synthesis is a mixture of optical isomers
    the other one produces single stereoisomer
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    (Original post by rory58824)
    Something to do with why it dissolves, I began talking about blood but I think that's wrong. The ketone was 4 straight carbons with a methyl group in there as well if I can remember
    I think it dissolves because it forms hydrogen bond with water in blood?
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    (Original post by 5824)
    So for getting the alcohol structure wrong, you'd lose 3 marks?
    no 1 as the alcohol was F
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    (Original post by rory58824)
    Yes I had that in my mind, but water on the skin? Sweat? I don't know, it just didnt make sense to me lol.
    i was thinking stitches on fingers so water when washing hands etc
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    (Original post by maisym00)
    I wrote about optical isomers but I'm not sure
    yes you are absolutely right it was a chiral carbon and bacteria tend to produce only one isomer i am a complete moron
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    (Original post by sakuraton)
    GUYS, you know the tripeptide question, do you draw unit repeat format or a normal tripeptide with carboxylic acid and amine at either end?? (I did both)
    repeat format, as a tripeptide forms polypeptide i think
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    Pla break down because of hydrolysis living the acid as the product and then the acid form hydrogen bond with water ??
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    (Original post by milutin767)
    yes you are absolutely right it was a chiral carbon and bacteria tend to produce only one isomer i am a complete moron
    OH SH*T....
    I started talking about renewability.....-_-
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    i found the paper way too easy. What do u guys think about boundaries? i think it would be somewhere like 51
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    If I got the structure of F wrong would I get error carried forward for the other structures?


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    For the 7 marker analysis, i got the structure of G wrong, meaning I got F and I wrong , but still got H right as that was separate. If my working for H is right, what's the max I could get?


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    (Original post by 5824)
    If you used calculator unrounded figures, you got 2.67, but if you used yoru rounded working figures, you got 2.66
    I used calculator figures (fractions) and got 2.66
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    Can someone make an UNOFFICIAL MARKSCHEME please.
 
 
 
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