OCR F324-June 2013 Chemistry

want to revise

yeah ... I am worried though because loads of people on here have retook so many times and still havnt got A

Does everone know what they need to get an A/B in A2 chemistry?

Yea, need 39 for a B and 99 for an A, trying really hard to get the A* though as I've worked extremely hard over the past 2 years and I would be really gutted if I miss out on it.

Hey how is F324 going.

Yea it's going ok, quite enjoying it but I'm not going to revise till Easter, if I start too early I'll just get bored. Mostly it is quite simpler, a lot more so than F325, just a lot more to learn.

Dont worry! Just key thing about this unit is to just be careful with the connectivity and learn mechanism and reagent, do lots of questions and revise! better start revising ASAP!

ok

What do you understand by the process of 'transesterification' and describe (3)

Wait...which one is that one?

It is in chapter 1 , ill give you a clue , something to do with Biodesiel

I've almost finished covering F324 now
Just finishing up on Spectroscopy and such.
I will be done before Easter.
I'm sitting this for the first time and resitting F325 and F322

It is in chapter 1 , ill give you a clue , something to do with Biodesiel

I remember glycerol and something is used to make the biofuel

yes , you are getting there.

Its literally got to do with the fact that , this is the process in which Bio diesel is made and is where a triglyceride reacts with methanol or ethanol in the presence of either sodium or potassium hydroxide catalyst forming biodisel and glycerol.

But good for saying that glycerol is formed cause you would get some marks.

My turn

Talk to me about azo dyes!

Why does bromine react more readily with phenol than benzene?

Good Luck , I am sure you will do well

Want to revise F324 for a bit/

Can you ask me from carobxylic acid all the way to chapter 2.

My friend , nice to see you again !!!


Azo dyes !

Firstly, the process of making aromatic amines are that a nitrobenzene has to react with a mixture of concentrated HCL(aq) and Sn and the process has to be done under reflux for phenylamine to be made.

Then there are two reactions , Diazotisation and coupling reaction.
In dizotisation , this is where the nitrous acid is reacted with phenyl amine and with concentrated HCL to form the diazonium ion.HNO2 is made in reaction mixture in-situ and reaction is kept <10 degrees.

couping reaction is where the diazonium ion is reacted with an alkaline so is under alkaline conditions and forms the azo dye which is a brighly coloured compound/