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    (Original post by GawdHeresEmmie)
    It wasn't a repeat unit they wanted though wasn't it a tripeptide? So with a full nh2 and cooh group at either end.
    I must have got it wrong then
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    Ketone for G and secondary alcohol for F , ester for I and carboxylic acid mr=74 anyone correct me f I'm wrong
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    (Original post by grannyG)
    Lactic acid has a chiral carbon, meaning chemical synthesis produces optical isomers whereas biological synthesis (fermentation) doesn't
    Do you remember how many marks that question was?
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    Use of polyamide?
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    (Original post by EricPiphany)
    So you put three chiral centers on the tripeptide like a good boy?
    Haha
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    (Original post by dapter444)
    Use of polyamide?
    I put fibres in clothing
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    (Original post by Hollyht)
    Don think it could have been a straight line coz there was 5 carbons but only 4 carbon environments so I did 4 in a row then a methyl group on end and Ketone on 2nd carbon


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    Yeah I did the same as you
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    (Original post by safhassan)
    That was an awesome paper.
    Proud to say like the trolls in TSR exam threads it was a walk in the park.
    Tsk, you always looked down at them, and now it's you.
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    (Original post by angrybirdzzz)
    No, calculator unrounded gave 2.66 for me. 2.65645.....
    I agree i also got2.66 using unto undead calculator figures you're right
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    It couldn't have been because the Carbon -13 NMR gave 4 carbon environments, but your one would only have 3 as it would be symmetrical
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    (Original post by 5824)
    I put fibres in clothing
    Do you think they'll give me the mark for bullet proof vests?
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    (Original post by NervousBoy)
    It couldn't have been because the Carbon -13 NMR gave 4 carbon environments, but your one would only have 3 as it would be symmetrical
    I got that wrong too, how many marks do you think ill drop because of that?
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    (Original post by maisym00)
    Oh god, I wrote about them being photobiodegradavle on exposure to UV😕 Oops
    I put that too!

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    I put both down as I thought because its 3 marks they want a longer answer - I think both are valid points !
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    Questionable, it was nylon not Kevlar. But I don't really know.

    (Original post by nicoleemmak)
    Do you think they'll give me the mark for bullet proof vests?
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    (Original post by Lion2121)
    I must have got it wrong then
    Well I did both. May odds be in my favour
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    I talked about it being photodegradable. The thing that made me think that was the "technical terms spelt correctly". Photodegradable has been a 'spelling' mark on a previous paper.
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    what was the skeletal for the trans it was just a straight chain alkene at 12 right?

    and for the triglyceride will they accept skeletal for the fatty acid chains?
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    I used 60% for the percentage yield question and got 2.61 , how many marks will I get out of 3?
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    also any predictions for 100ums (please don't say 60 lol)
 
 
 
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