AQA CHM4: Usual Suspects?

Year 12s: what will be the first way you research your future options? >>

Scroll to see replies

Reply 40

Carlo08

The oh- removes h+ so it will replace it by moving to the right therefore producing more salt and becoming more basic

Reply 41

Revd. Mike

Last question, where you had the structures of V and W, and you had to name them, what did people name W? I'd never seen something like that before! I think I guessed at something like dimethyl ethandioate :confused:

H3CO---C---OCH3
|
H3CO---C---OCH3

Reply 42

Carlo08

it was di methyl ethandioate but i missed out the first di grrr and for the ethanoic anhydride i said ethanoyl anhidride grrrr :s thats 2 marks wasted!

Reply 43

yoyoyomo

that was weird!!!!!!!! does anyone think grade boundaries will be slightly lowered? i know ive got the buffer question wrong, and i must have lost some marks on the isomers question, and on the regeneration of catalyst question. i'll be very happy with 70/90!

Reply 44

Carlo08

The buffer was hard, the catalyst one was just:

Alcl3 + R-ocl --------> Alcl4- + R-o+
C6H6 + Ro+ -------> C6H5-RO + H+
Alcl4- + H+ ------> Alcl3 + HCl

Reply 45

bringthenoise

I've done really badly on this paper, actually worse than the first time round!! answered abotu 20 marks off the whole paper.. but at least it means i dont have to bother revising for the synoptic and module 5 next week!