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OCR Chemistry A F324 Rings, Polymers and Analysis Tue 19 June 2012

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    What are the conditions needed for nitartion of benzene?
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    (Original post by Fatima0065)
    yep go on u start
    right
    Define: isoeletric point (2)
    Define:zwiterrion (1)
    and what happens if glycine is PH 1.6(2)
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    (Original post by otrivine)
    right
    Define: isoeletric point (2)
    Define:zwiterrion (1)
    and what happens if glycine is PH 1.6(2)
    oh i'm not good at teh definition but okai:
    isolectric point: the point at which an amino acid acts as a zwitterion

    zwiterrion: has no overall charge. the cooh group is acidic so loses a H+ and the nh2 is basic therefore gains a H+

    if glyicine is at ph 1.6: it froms an NH3+ ion ??? (not sure)
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    Definition for optical isomer:?

    Why is it important that when forming a diazonium ion the temp is under 10C?
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    (Original post by Fatima0065)
    oh i'm not good at teh definition but okai:
    isolectric point: the point at which an amino acid acts as a zwitterion

    zwiterrion: has no overall charge. the cooh group is acidic so loses a H+ and the nh2 is basic therefore gains a H+

    if glyicine is at ph 1.6: it froms an NH3+ ion ??? (not sure)
    Good just the last part yes it forms NH3+ and forms C00-
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    (Original post by Fatima0065)
    Definition for optical isomer:?

    Why is it important that when forming a diazonium ion the temp is under 10C?
    optical isomer is where a carbon atom is attached to 4 other atoms/groups chiral carbon

    it is important as it has to be its conditions and not to cause any side affects/not sure
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    (Original post by otrivine)
    Good just the last part yes it forms NH3+ and forms C00-
    why coo- isn't that jsu in the alkaline conditions?
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    (Original post by otrivine)
    optical isomer is where a carbon atom is attached to 4 other atoms/groups chiral carbon

    it is important as it has to be its conditions and not to cause any side affects/not sure
    first one's correct but
    2nd one: because the N2+ is unstable so any temp above 10c it would decompose to form phenol, n2 and h20
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    (Original post by Fatima0065)
    why coo- isn't that jsu in the alkaline conditions?
    that was exactly what i was thinking but saw the jan 2012 paper and so for PH 1.6 they did NH3+ and COO-
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    (Original post by fatima0065)
    first one's correct but
    2nd one: Because the n2+ is unstable so any temp above 10c it would decompose to form phenol, n2 and h20
    thanks i did not know that
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    in the presnece of excess ammonia when ffromig a halogenalkane which two products are formed
    soory thats worded wrong excess amonia to a halogen alkane..what two products are formed?
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    (Original post by otrivine)
    thanks i did not know that
    no problem
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    (Original post by otrivine)
    that was exactly what i was thinking but saw the jan 2012 paper and so for PH 1.6 they did NH3+ and COO-
    oh do u know why?
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    (Original post by Fatima0065)
    in the presnece of excess ammonia when ffromig a halogenalkane which two products are formed
    soory thats worded wrong excess amonia to a halogen alkane..what two products are formed?
    oh my i have not revised that part yet is this chapter 1 ?
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    otrivine..ur turn...
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    (Original post by Fatima0065)
    oh do u know why?
    No to be honest ? but i just learned it has to be NH3+ AND COO - ?
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    (Original post by Fatima0065)
    otrivine..ur turn...
    What are they doing to polymers to prevent landfill sites (2)
  18. Offline

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    (Original post by otrivine)
    oh my i have not revised that part yet is this chapter 1 ?
    its part of the page on amines
  19. Offline

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    (Original post by otrivine)
    What are they doing to polymers to prevent landfill sites (2)
    Making the biodegradable and photodegradable?
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    Why is TMS used for proton NMR?

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