HOW WAS CHEMISTRY P42 MAY/JUNE 2017 (POLL)

[darks]

when do we use the bond energy in the enthalpy change

1/2O2--->O(g) in born haber cycle.. right after DHatm of the metal.

 

[sara_queen]

1/2O2--->O(g) in born haber cycle.. right after DHatm of the metal.

thank youuuuuuuu

 

[replayzxc]

Bye, 10 marks.

 

[Qaussain]

Keq3= kstab2/ kstab 1
lattice energy was -2280 KJ
Delta G was -111.92
Delta H was 8
PH of amino acid was 5.43

 

[Irfanhaider0533]

What were the values of n?

 

[Qaussain]

What were the values of n?

I just simply wrote 0,1,2
Didn't calculated ,
I was stuck at this part .-.

 

[AnonymousX9]

Whoever voted for the paper being 'normal', MashaAllah man. Kudos to you. You're one special piece.

 

[Ecosora]

Any idea about the thresold ?

 

[Shafin Ahmed]

I hope the threshold is 40-45 for A. The worst gt I have seen was 48 but this year, it seemed to be one of the hardest question ever made.
It was really hard to complete such a question within 2 hours. It was like a 2.5-3 hours paper.

 

[anon457]

what were your answers for organic

 

[ALevel2017KID]

What about the Mr and RCOOH question guys?

 

[Cherry lava]

It was a mess
Can't even recall answers
Really depressed


 

[darks]

i think gt will be around 55 after looking at posts here... Although i did not find it 55 tough, and was thinking of a gt in 60-65 range after giving the paper.

 

[darks]

BIOLOGY P42 Was still tougher for me. Went wayy worse.

 

[Shafin Ahmed]

What about the Mr and RCOOH question guys?

Mr was 122 afai remember. R was C6h5 most probably

 

[darks]

Mr was 122 afai remember. R was C6h5 most probably

most friends and i got mr 185...

 

[HELLNO]

You guys scared me!! I am doing p41 in an hour! :/

 

[anon457]

how did u calculate?

most friends and i got mr 185...

 

[darks]

how did u calculate?

what did you get? i used moles of the previous part in n=m/mr. i think mr= 1/0.0054. Again i am not 100% sure that i am correct.

 

[Shafin Ahmed]

most friends and i got mr 185...

You took the remaining moles to calculate Mr and I took the initial no of moles in 1g acid to calculate Mr.
I calculated 1/(8.2 x 10^-3) = 122