Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
Vin:
--- Quote from: the golden girl on May 07, 2010, 07:13:43 pm ---thx alot , both of u !! ....... i feel like i awe u alot .....really thx alot !!
~VIN1094~ - i just wanna kno how did u get ot feel there too easy ..in other words , what did u do to feel so not worried/so comfortable with chemistrey paper1 or even such question?...
thx in advance
--- End quote ---
ur welcome
its all practice which made me confidant .. if i had to say jus kno ur concepts well .. the thing is chemistry paper 1 wasn't too easy until a month ago but as u might kno im preparing fo boards now n obvi i might hav studied chemistry ..
but i lack miserably in stoichiometry .. i cant even spell it properly !! :p
i'd recommend u study from "complete igcse by RoseMarie Gallaghar and Paul Ingram" .. an amazing book gets all your doubts cleared !! :)
if u dont hav it u might consider visiting ur school library .. its still not late :)
in fact complete is good for all 3 sciences ..
gud luck !! :) (guess wat this is my 100th lucky post .. :P)
CatAly$t:
can somebody tell me what's the difference between ester link and amide link???
Vin:
--- Quote from: CatAly$t on May 07, 2010, 08:17:30 pm ---can somebody tell me what's the difference between ester link and amide link???
--- End quote ---
Esters are basically umm.. when u react alcohols with carboxylic acids u get esters ..
say ..
propanoic acid + butanol <===> butylepropanoate
they are reversible .. (pls. dont go over my spellings, another thing im concerned about my exams)
amide link is where a couple of monomers have joined .. im sorry i dont have any means to show you in a graphical way .. :(
nid404:
amide link or peptide link is formed when the amine group of one monomer reacts with the carboxylic acid of another in a condensation polymerisation reaction...
O
||
NH2 -(R1) -C-N- (R2)-COOH
|
H
the CONH bond is the amide link. R1 and R2 represent different monomer units(amino acids). By product of this reaction is water
Vin:
hmm Thanks .. :)
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