View attachment 64621 Need help with (ii)
Atomic mass is the weighted average of isotopic masses:
10.8 = 19.78%(10.0129) + 80.22%(m)
m = 10.9941 (6sf)
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View attachment 64621 Need help with (ii)
How did you ended up with 10.8?Atomic mass is the weighted average of isotopic masses:
10.8 = 19.78%(10.0129) + 80.22%(m)
m = 10.9941 (6sf)
Atomic weight from periodic table.How did you ended up with 10.8?
Please explain iiView attachment 64625
There are some qs where its of 6 marks the best thing you could for it is Practice, Practice actually helps alot.Having problem/confusion in deducing molecule thorugh NMR pattern.
Taking alot alot of time and it is of only 1-2 or maximum 3 marks.
what should i do not getting better in it?How you people doing?
The rate equation depends on the slow step in the mechanism. Here step one is the slow and it needs no Y atoms and two X atoms.Also for this one , why is N zero order, why not first? Thanks a lot in advance
For step 4: why is the reagent aqueous Hcl and heat? We are turning amide to amine so shouldn’t it be reduction with LiAlH4?
https://www.facebook.com/463818014075291/posts/671605593296531/?sfnsn=modoes anyone have the 2019 march paper4?
But the amine will react with the acid and form ammonium ion in acidic hydrolysisThere is two ways to turn an amide to an amine
1) Hydrolysis, using HCL(aq) and heat
This breaks the amide linkage completely and you end up with two molecules, the amine and the acid
2) Reduction, using LiAlH4
Here you end up with one molecule, an amine, the carbons in the carboxylic acid group remain attached while the oxygen is removed
I think its supposed to be NaOH(aq) + HeatFor step 4: why is the reagent aqueous Hcl and heat? We are turning amide to amine so shouldn’t it be reduction with LiAlH4?
Fair enough, edited.But the amine will react with the acid and form ammonium ion in acidic hydrolysis
It's electrophilic addition of bromine across the double bond.For this compound Q, if we add excess Bromine , why does bromine get added to the right end side? I thought it was only on the benzene ring but in the marking scheme they said bromine is added on benzene and on the right end side
chemistry 0620I really need chemistry paper 6 march 2019 paper please someonse send it
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