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

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    amide hydrolysis question with HCL did you get nh3+ for the amine that had the alcohol attached to it as well?
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    (Original post by Yazmin123)
    also any predictions for 100ums (please don't say 60 lol)
    At a guess, anything in the range 58-60.

    How about...

    90/90 - 58
    A* - 54
    A - 50
    B - 46
    C - 42
    D - 38
    E - 34
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    (Original post by Yazmin123)
    also any predictions for 100ums (please don't say 60 lol)
    49/50 for A
    53 for A*
    57 for full ums

    it was fairly easy probs be like june 2013 boundaries
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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 wrote about the cooh and oh groups on lactic acid hydrogen bonding with water in the body?? Didn't wanna get to biological bc its a chemistry exam.
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    hated this paper gonna get a u
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    What did everyone get for the NMR table?
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    (Original post by Yazmin123)
    amide hydrolysis question with HCL did you get nh3+ for the amine that had the alcohol attached to it as well?
    Yep.
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    Was there 3 chiral carbons for tripeptide, 2 on the middle carbon of the amino acids apart from glycine and 1 on the R group for the aminoacid with the long r group?
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    "find out the identity of compounds ASDFGHJKL" OCR says as they give us literally 0 space
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    (Original post by KB_97)
    I wrote about the cooh and oh groups on lactic acid hydrogen bonding with water in the body?? Didn't wanna get to biological bc its a chemistry exam.
    Yeah I did begin to talk about hydrogen bonding. I then talked about lactic acid being a fairly polar molecule, so it will dissolve in water?
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    I got that too.

    (Original post by Sahil_)
    Was there 3 chiral carbons for tripeptide, 2 on the middle carbon of the amino acids apart from glycine and 1 on the R group for the aminoacid with the long r group?
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    1. Was there 3 chiral carbons for tripeptide, 2 on the middle carbon of the amino acids apart from glycine and 1 on the R group for the aminoacid with the long r group?
    That's what I got yeah - the one with the branched alkyl R group has a chiral carbon in the R group if I remember correctly
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    Confused on the acid hydrolysis. Textbooks give conflicting answers- CGP says its NH2 but main textbook says its NH3+, i put NH2 since it was dilute HCL hydrolysis. Think OCR would give me sympathy marks?
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    (Original post by sydneyl3igh)
    What did everyone get for the NMR table?
    I did this on literally in the last 30 seconds so might not remember correctly, but I think I got a doublet at 1-2 due to CH3, a hextet at 2-3 due to HC-N? (This is the one I wasn't sure on lol) and a doublet at 3-4 due to HC-O
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    The real mystery is what happened to the third amino acid.
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    Was a nice exam overall, hopefully I will get an A. But I got the percentage yield question wrong annoyingly. Would you get a mark for ECF and a mark for correct significant figures?
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    why on earth would the teacher dissolve a peptide with dilute hcl? waste of lab space and money. illogical ffs
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    Is there an unofficial mark scheme?
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    (Original post by Lion2121)
    Yes as it required no working out it was worth 1 mark, you'd probably lose the ketone mark as well thats it
    So could I lose a max of 2 marks for that question


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    (Original post by sydneyl3igh)
    What did everyone get for the NMR table?
    It was a double, multiplet and doublet for the splitting pattern
 
 
 
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