[otrivine]

(Original post by Fatima0065)
Making the biodegradable and photodegradable?

brilliant

[otrivine]

(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?

hmm is it HBR and NH4BR?

[Fatima0065]

(Original post by otrivine)
brilliant

is taht right..aren't there any more reasons?

Why is TMS used for proton NMR?

[otrivine]

(Original post by Fatima0065)
Why is TMS used for proton NMR?

to be able to identify any OH groups present

[otrivine]

(Original post by Fatima0065)
is taht right..aren't there any more reasons?

Why is TMS used for proton NMR?

nope those 2 are perfect and would get you 2 marks

[Oromis263]

https://sites.google.com/site/mathsl...s-and-analysis

You can find my notes for this exam via that link. I really enjoyed it, and miss organic chem now we moved on to F325 Good luck everyone sitting this exam!

[Oromis263]

(Original post by otrivine)
to be able to identify any OH groups present

That is upon the addition of D20. TMS or tetramethylsilane is used as a reference peak, as it is very close to a 0 value.

[Fatima0065]

(Original post by otrivine)
hmm is it HBR and NH4BR?

yep, basically when a halogen alkane is added to excess amonia...for example

ch3ch2cl + 2nh3 ---> ch3ch2nh2 + nh4cl

so an ammonium chloride ion is formed. but when ammonia is not in excess
HCL is formed ...does that make sense?

[Fatima0065]

(Original post by Oromis263)
https://sites.google.com/site/mathsl...s-and-analysis

You can find my notes for this exam via that link. I really enjoyed it, and miss organic chem now we moved on to F325 Good luck everyone sitting this exam!

THANKS..very helpful but is this the same as the alevelchem wensite question packs?

[otrivine]

(Original post by Fatima0065)
yep, basically when a halogen alkane is added to excess amonia...for example

ch3ch2cl + 2nh3 ---> ch3ch2nh2 + nh4cl

so an ammonium chloride ion is formed. but when ammonia is not in excess
HCL is formed ...does that make sense?

oh yes i got it thanks
ok
Do u do bio F214 cause i am revising bio now?

[Fatima0065]

(Original post by otrivine)
to be able to identify any OH groups present

D20 helps identify the 0H groups
TMS is used for a refeerence peak as it is:

chemically inert so it doesn't react with the sample and
volatile so it can easily be removed afterwards...

[Fatima0065]

(Original post by otrivine)
oh yes i got it thanks
ok
Do u do bio F214 cause i am revising bio now?

nope im doing f215...did f214 in jan

[otrivine]

(Original post by Fatima0065)
nope im doing f215...did f214 in jan

oh how was it ? do you mind if we revise bio F215 cause i am scared if i revise chem i get mixed up sorry

[Fatima0065]

(Original post by otrivine)
oh how was it ? do you mind if we revise bio F215 cause i am scared if i revise chem i get mixed up sorry

i din't do too wel cuz tehre was a stupid glas beads questions..you might have heard about but yh...i like learning the stuff but i didn't liek the exam..have you done f215?

[Fatima0065]

and nope you acrry on revsiing for the bio..speak 2 u lter...

[otrivine]

(Original post by Fatima0065)
i din't do too wel cuz tehre was a stupid glas beads questions..you might have heard about but yh...i like learning the stuff but i didn't liek the exam..have you done f215?

no its first time ? but the paper was nice i did it as mock the Jan 2012 and got a high B

[otrivine]

(Original post by Fatima0065)
and nope you acrry on revsiing for the bio..speak 2 u lter...

im sorry

[Oromis263]

(Original post by Fatima0065)
THANKS..very helpful but is this the same as the alevelchem wensite question packs?

No, these were personal notes.

[Fatima0065]

(Original post by otrivine)
no its first time ? but the paper was nice i did it as mock the Jan 2012 and got a high B

thats erally good! whats first time? so your doing f215? and f324 and f325? and u did f322..hw r u coping?

[Fatima0065]

(Original post by Oromis263)
No, these were personal notes.

oh okai..thanks anywais..would rep u but i dnt know how to lol what did u get for f324..hav u got any tips etc..? and is it okai if i ask for help if i need it?