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OCR A Chemistry F324 Rings, Polymers and Analysis Thu 26 Jan 2012 watch

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    (Original post by arvin_infinity)
    Yh that makes more sense !

    Whats wrong with having heart pace maker and using MRI scan !! ??
    cant put metal in an MRI scanner for one thing (i assume theyre made of metal) also the EM waves interfere with the pacemaker which could stop someones heart or give them an irregular heart beat :eek:
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    (Original post by --NWzD9--)
    I think the broad peaks is due to the fact tha O-H and N-H can form hydrogen bonding (i think thats the most we need to know)

    CDCl3 doesn't produce any peak on proton NMR because there are no hydrogens. the deuterium has two nucleons, which cancel out each others spin, therefore no residual spin, and so are not detected on the NMR spectra

    When they mean 'broad' what they usually mean is that the base of the peak is slightly wider than other peaks
    correct except when they say broad i think they mean the peak can be in a broad range
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    (Original post by High VOLTAGE)
    oh ok , so would i just place cl- next toNH3?
    Write it as NH3+Cl-
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    (Original post by Mike-nificent)
    Write it as NH3+Cl-

    (Original post by Stevo F)
    NH3+ Cl- is what u have to do

    thanks
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    (Original post by Stevo F)
    cant put metal in an MRI scanner for one thing (i assume theyre made of metal) also the EM waves interfere with the pacemaker which could stop someones heart or give them an irregular heart beat :eek:
    How do you know so much! I'm so jealous, I feel like I know nothing when I read your posts
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    Hi guys ... if possible can someone explain to me the dehydration of the compound and then it somehow become cyclic ... and I can't really find any comprehensive notes in the book :s
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    (Original post by Gemxx)
    Hi guys ... if possible can someone explain to me the dehydration of the compound and then it somehow become cyclic ... and I can't really find any comprehensive notes in the book :s
    If you have NH2CH2CH2CH2COOH - imagine just joining the COOH end with the NH2 end to release a water molecule --> it will be in a cycle because u are joining the head and tail together - cant draw it, but just do a condesnation reaction between those groups both of on the same molecule and it become cyclice and dehydrated as you have lost water
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    How is NMR used in medicine to diagnose illness? 3 marks
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    (Original post by cheesebase)
    If you have NH2CH2CH2CH2COOH - imagine just joining the COOH end with the NH2 end to release a water molecule --> it will be in a cycle because u are joining the head and tail together - cant draw it, but just do a condesnation reaction between those groups both of on the same molecule and it become cyclice and dehydrated as you have lost water
    Thank you
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    (Original post by arvin_infinity)
    How is NMR used in medicine to diagnose illness? 3 marks
    pfft learnt this in physics, havent covered it in chemistry
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    What is the pH called at which zwitterions will exist?
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    (Original post by Stevo F)
    What is the pH called at which zwitterions will exist?
    the isoelectric point
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    (Original post by Stevo F)
    What is the pH called at which zwitterions will exist?
    isoelectric point. varies according to the R group
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    (Original post by arvin_infinity)
    How is NMR used in medicine to diagnose illness? 3 marks
    Do you have the answer to this............................ ............or are you asking
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    isoelectric point

    ----

    wats the answer to that question ..havent made it up btw
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    (Original post by Mike-nificent)
    isoelectric point. varies according to the R group

    (Original post by StuartCB)
    the isoelectric point
    good, good just testing :P
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    (Original post by Mike-nificent)
    Do you have the answer to this............................ ............or are you asking
    not in the syllabus dont worry
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    (Original post by Mike-nificent)
    Do you have the answer to this............................ ............or are you asking
    Hahah..sorry am asking
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    How do you improve the atom economy of fermentation? What can the companies do with the CO2?
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    (Original post by LifeIsGood)
    Oh my 7?! How many do you have in Summer?
    oops missed ur post there :L errm 5 + retakes which will probs be about 3 aaahh
 
 
 

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