Aqa chem4 15th june 2011 (resit) thread

Reply 580

king101

3

There can be two questions form that, either how a racemate is formed or why does a racemate not rotate light

Reply 581

king101

3

Original post by al_habib

guys rate determination step seem to come evry exam how do we know which reaction is the slowest

The reactants should both be in the Rate Equation.

Reply 582

FristyKino

2

Stupid me - I forgot my stationary case at home.
Worst thing that could happen to me - NOW im tensing :-s

Reply 583

al_habib

1

Original post by king101

There can be two questions form that, either how a racemate is formed or why does a racemate not rotate light

racemate- is it 50:50 mixture of equal enantiomers

Reply 584

SashaLuLu

some bases are stronger than others, for example when there is a methyl\ ethyl group that will be a stronger base than nh3. is that because it is ELECTRON RELEASING OR ELECTRON DRAWING relative to hydrogen?

Reply 585

MoMatrix

Original post by SashaLuLu

some bases are stronger than others, for example when there is a methyl\ ethyl group that will be a stronger base than nh3. is that because it is ELECTRON RELEASING OR ELECTRON DRAWING relative to hydrogen?

Electron are released toward the nitrogen increasing its electron density making it more attractive to protons i.e a better base.

good luck guys....

Good Luck everyone!!!!!!!!!!!!!!!!!

Reply 588

black_vine

Hated it.

Low grade boundaries or high?

Reply 589

hedon586

yeah, some of it sucked!

Reply 590

al_habib

1

was the rate determining step

Reply 591

black_vine

Original post by al_habib

was the rate determining step

I think it was Step 3

Reply 592

dolmio

7

****test exam evarrrr!

Reply 593

al_habib

1

how did you find the paper guys!

(edited 12 years ago)

Reply 594

al_habib

1

Original post by black_vine

I think it was Step 3

oh *** i wrote 1step

Reply 595

cheeseisnice

Thought it was okay when I was doing it, then came out to find I got different answers to everyone else!
What did people get for the pHs?
I got something like 4.7 for the first one then 13.01 for the second?!
I REALLY NEEDED AN A :frown:

Reply 596

eharrison93

Original post by cheeseisnice