Aqa chem4 15th june 2011 (resit) thread

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for the pH one..

if we didn't do half neutralisation...but just used the excess, what do you guys think AQA would do when marking?

because they normally give us titration graphs etc and then ask question about half neutralisation etc...never mind lol

I have no idea about the half neutralisation method, i just do it...normally :P

Reply 781

lou12

Original post by JK471993

As long as it was half-neutralisation, none. In fact you should be awarded bonus marks for your astuteness!

haha thanks :smile:

wish you were marking my paper

Reply 782

kingsmod1

wat grade did u lot get in chem 4? in jan

wat grade did u lot get in chem 4? in jan

wat grade did u lot get in chem 4? in jan

Reply 783

empop92

Original post by JK471993

With the fragmentation question, will I be okay if I drew out benzene instead of writing it as CH3 etc?

i did that too, i think its allowed seeing as they left us a massive space to write the equation!

Reply 784

i3kel

Original post by timcull

Can't really remember to be honest hahaa. I think.........
Triplet for a and Singlet for b i'm afraid! :/

yeah thats what I got

Reply 785

rachel0593

Original post by i3kel

it was 3 on the left and 2 on the right

Yeah but we're wrong unfortunately, looking at about 2/4 marks for it, and I think since I forgot to divide by the new volume I would get 2/4 in the second part 2. Really frustrating that I just rushed those parts.

yeah, I read on a bit further and saw that. I always forget that it's in mol and not moldm.. ah well

Reply 786

empop92

Original post by kingsmod1

wat grade did u lot get in chem 4? in jan

wat grade did u lot get in chem 4? in jan

wat grade did u lot get in chem 4? in jan

mid B! you?

Reply 787

jwest

Original post by rachel0593

I got
increase
increase <-- i thought when the volumes increased, the pressure decreases and the equilibrium shift to the side with the most moles of gas which was the side of P?
decrease
no change

yeh i think i got that, what was the no change for? i think i put that but can't remember

Reply 788

Mobs25

Original post by jwest

yeh i think i got that, what was the no change for? i think i put that but can't remember

no change to the value of Kc

Reply 789

kingsmod1

Original post by empop92

mid B! you?

low B, decided to leave it there, but hve to do much better in chem 5!

wat grade did u lot get in chem 4? in jan

Reply 790

jwest

Original post by empop92

i did that too, i think its allowed seeing as they left us a massive space to write the equation!

yeh when i saw the massive gap i just went for it, are we meant to put a + and a . on the fragments?

Reply 791

cleo101

wat did everyone name the compound which had amine group alcohol and cooh :confused:

Reply 792

uxa595

CycloAlkene > Haloalkane (C6H5BR)
Nuc Add
HBR

Then
Haloalkane > Amine
Nuc Sub (can't be add-eli as only BR and NH2 changed places??)
Excess NH3?

would that be right?

Reply 793

username401136

Original post by jwest

yeh when i saw the massive gap i just went for it, are we meant to put a + and a . on the fragments?

Yeah bro

Reply 794

lou12

for the questions about the splitting patterns, there were only 3 parts to each, right?
the splitting pattern
the name of the compound
and something else but i can't remember?
keep thinking i've missed out questions!

Reply 795

MoMatrix

Original post by cleo101

wat did everyone name the compound which had amine group alcohol and cooh :confused:

2aminohydroxypropanoic acid something along those lines......

Reply 796

username401136

Original post by uxa595

CycloAlkene > Haloalkane (C6H5BR)
Nuc Add
HBR

Then
Haloalkane > Amine
Nuc Sub (can't be add-eli as only BR and NH2 changed places??)
Excess NH3?

would that be right?

It's electrophilic isn't it? You're breaking a double bond with HBr?