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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?
Reply 41
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otrivine
14
Original post by Fatima0065
yep go on u start :smile:


right :smile:
Define: isoeletric point (2)
Define:zwiterrion (1)
and what happens if glycine is PH 1.6(2)
Original post by otrivine
right :smile:
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) :smile:
Definition for optical isomer:?

Why is it important that when forming a diazonium ion the temp is under 10C?
Reply 44
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otrivine
14
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) :smile:


Good just the last part yes it forms NH3+ and forms C00-
Reply 45
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otrivine
14
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
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?
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 :smile:
Reply 48
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otrivine
14
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-
Reply 49
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otrivine
14
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 :smile:


thanks i did not know that:wink:
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?
(edited 11 years ago)
Original post by otrivine
thanks i did not know that:wink:


no problem :smile:
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?
Reply 53
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otrivine
14
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 ?
otrivine..ur turn...
Reply 55
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otrivine
14
Original post by Fatima0065
oh do u know why?


No to be honest ? but i just learned it has to be NH3+ AND COO - ?
Reply 56
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otrivine
14
Original post by Fatima0065
otrivine..ur turn...


What are they doing to polymers to prevent landfill sites (2)
Original post by otrivine
oh my i have not revised that part yet is this chapter 1 ?


its part of the page on amines :smile:
Original post by otrivine
What are they doing to polymers to prevent landfill sites (2)


Making the biodegradable and photodegradable?
Why is TMS used for proton NMR?

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