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    (Original post by student.1997)
    In the one where you had to draw ethanoic anhydride and another product, was the other product ethanoic acid?
    Yeah yeah - Ethanoic acid.
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    (Original post by Cal 1)
    For the first question it was the THIRD fatty acid. The question asked which is 'most LIKELY' to cause heart disease. The third fatty acid is most LIKELY to have at least one trans bond, and therefore most likely to be a trans fatty acid. It is TRANS FATTY ACIDS that act like SATURATED FATS. Key point to note here is there is a difference between TRANS FATS and TRANS FATTY ACIDS.
    trans fats are potentially more damaging than saturated fats as they not only increase ldl levels but they reduce hdl levels according to the spec. I think you could get either fatty acid 1 or 3 depending on your explanation both can be argued
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    (Original post by Cal 1)
    Some trans fats are made naturally. Literally type 'are trans fats naturally occurring' into google and you'll find that some are.
    maybe so, but according to the text book and ocr, the link we're supposed to make is cis are naturally occuring and trans are produced via processes like making margerine
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    (Original post by Notahugetsrfan)
    mate saturated fatty acids caused increased ldl production, you're wrong just accept and stop being a berkshire hunt with your arrogant insistence
    So do trans fatty acids? why are you in denial? trans fatty acids increase LDL and it is likely that the third will have a trans bond that's all I am saying.
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    (Original post by Cal 1)
    So do trans fatty acids? why are you in denial? trans fatty acids increase LDL and it is likely that the third will have a trans bond that's all I am saying.
    Answer to the first question was the first acid bro, the saturated one.
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    (Original post by johnjims828)
    trans fats are potentially more damaging than saturated fats as they not only increase ldl levels but they reduce hdl levels according to the spec. I think you could get either fatty acid 1 or 3 depending on your explanation both can be argued
    I totally agree. Thanks for clearing this one up.
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    I didn't take this but what's the general consensus?
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    Alright in my opinion
    Question 6
    f= ch3ch2chohch2ch3
    g= chech2coch2ch3
    h= ch3ch2cooh
    i= ch3ch2cooch((ch3ch2)(ch3ch2ch2))
    j= (ch3)3choh, becuase 0.221/2.85x10- = 74
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    (Original post by Cal 1)
    So do trans fatty acids? why are you in denial? trans fatty acids increase LDL and it is likely that the third will have a trans bond that's all I am saying.
    YES, TRANS FATTY ACIDS ARE INCREASE LDL LEVELS - NO ONE IS DENYING THAT IF YOU PAY ATTENTION TO WHT EVERYONE ELSE IS WRITING. What we are saying is that the SATURATED FAT - THE FIRST ONE - WILL GUARANTEE FORM A SATURATED FATTY ACID WHICH IS BAD. THE THIRD FATTY ACID MAY OR MAY NOT FORM A TRANS FAT, WHICH IS ALSO BAD, BUT WE CAN'T TELL AND IT'S MORE LIKELY TO BE A CIS FAT BECAUSE THE QUESTION SAID NATURALLY FORMING FATTY ACIDS FOR A REASON AND NATURALLY FORMING FATTY ACIDS ARE USUALLY CIS AND SO WILL FORM CIS FATS.
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    Anyone got an unofficial mark scheme up?
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    (Original post by S.Ahmad)
    Both for 3marks.

    explain that condensation polymers:
    (i) may be photodegradable as the C=O bond absorbs radiation,
    (ii) may be hydrolysed at the ester or amide group.
    i totally missed out the photodegradable part as i thought the stitches are too small to absorb radiation. all i write after saying that PLA could be hydrolyse is that lactic acid is a liquid, so the stitches would just flow away and dissolve lol, sounds so stupid but i cannot think of other answer.
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    (Original post by Timon512)
    YES, TRANS FATTY ACIDS ARE INCREASE LDL LEVELS - NO ONE IS DENYING THAT IF YOU PAY ATTENTION TO WHT EVERYONE ELSE IS WRITING. What we are saying is that the SATURATED FAT - THE FIRST ONE - WILL GUARANTEE FORM A SATURATED FATTY ACID WHICH IS BAD. THE THIRD FATTY ACID MAY OR MAY NOT FORM A TRANS FAT, WHICH IS ALSO BAD, BUT WE CAN'T TELL AND IT'S MORE LIKELY TO BE A CIS FAT BECAUSE THE QUESTION SAID NATURALLY FORMING FATTY ACIDS FOR A REASON AND NATURALLY FORMING FATTY ACIDS ARE USUALLY CIS AND SO WILL FORM CIS FATS.
    calm your farm
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    (Original post by lai812matthew)
    i totally missed out the photodegradable part as i thought the stitches are too small to absorb radiation. all i write after saying that PLA could be hydrolyse is that lactic acid is a liquid, so the stitches would just flow away and dissolve lol, sounds so stupid but i cannot think of other answer.
    Hahaha don't stress, I managed to remember the photodegradable bit, but not the hydrolysis - I'm a mess.
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    (Original post by S.Ahmad)
    Both for 3marks.

    explain that condensation polymers:
    (i) may be photodegradable as the C=O bond absorbs radiation,
    (ii) may be hydrolysed at the ester or amide group.
    Just going to add to this personally I don't think photodegradable is right because it specifically says in text book "c=o absorbs uv radiation when contained in polymer 'backbone'" but this c=o bond wasn't in the backbone so isn't photodegradable...
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    (Original post by Cal 1)
    So do trans fatty acids? why are you in denial? trans fatty acids increase LDL and it is likely that the third will have a trans bond that's all I am saying.
    No it isn't likely, trans fats only super super rarely occur in nature and especially unlikely as if I remember correctly the acid was linoleic acid (otherwise known as Omega - 6 and is an essential fatty acid for health.) - linoleic acid literally is cis cis (although it might be another acid, not entirely sure it was linoleic)
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    (Original post by S.Ahmad)
    Hahaha don't stress, I managed to remember the photodegradable bit, but not the hydrolysis - I'm a mess.
    so let's say each hydrolysis and photodegradable for 1, what would be the last point for.
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    (Original post by CalistaJupiter)
    Just going to add to this personally I don't think photodegradable is right because it specifically says in text book "c=o absorbs uv radiation when contained in polymer 'backbone'" but this c=o bond wasn't in the backbone so isn't photodegradable...
    I can't imagine how hydrolysis would be three marks, that's why I personally think its a viable answer and most likely will be credited for in the markscheme. But I defo agree.
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    (Original post by Cal 1)
    So do trans fatty acids? why are you in denial? trans fatty acids increase LDL and it is likely that the third will have a trans bond that's all I am saying.
    You guys are arguing over nothing. None of use know the answer 100% but I personally see a flaw with your argument because the question specifies "naturally occurring fatty acids" and the textbook says "naturally occurring unsaturated acids are cis"
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    For the nylon question asking for the type of condensation polymer do you think theyll accept 'amide' since it asked for the type of condensation polymer inferring poly anyway?
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    (Original post by lai812matthew)
    so let's say each hydrolysis and photodegradable for 1, what would be the last point for.
    Photodegradable --> broken down into CO2 and H2O -MAYBE?
 
 
 
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