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AQA Chemistry CHM4 12th June 2008

Thought i'd make a proper thread for discussion.

How did you find it?

I thought it was harder than past papers but i think did alright overall.
I know i messed up Q7aii cus i didn't recognise that one was an acid and not a ketone... put down Tollen's instead of Na2CO3.

Other than that it was ok. Very very last question was a bit of an odd one.

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Reply 1

Wenzel

I found it harder than past papers too, but think I've done ok overall, should get me what I need. I know I've screwed up the primary amine though and think I might have got the names in the last question on the paper wrong.

Reply 2

happy-and-lost

I couldn't name that acid anydride or that diester at the end, but it was nonetheless a fair paper. I feel it went well :smile:

Reply 3

paul10590

i said hydrogen cyanide for the ketone + acid one..... not sure if that count though lmao. couldn't think of why it would distinguish them but i knew it wasn't tollens. oh well

Reply 4

Fointy

Ah I'm guted about that question for the acid test tbh because if i recognised what species it was than i could have named the test perfectly. Really should get over it tho.

For the names in the last Q i put ethanoic anhydride and and dimethyl-ethandioate. Just my best guess really. I suggested that the anhydride's single peak would be 0.7-1.2 and the other was in the ester range point.

what was your test to distinguish benzene and the cyclohexene? I went for bromine water.

Reply 5

Misc

a bit harder than past papers! i just don't like isomers! :s-smilie:

Reply 6

Bandit Queen

What values did everyone get for the buffer solution? I think I got 4.23 or 4.24.

Overall, not horrific, but am getting increasingly nervous about Mod 5 and 6!

Reply 7

boffin_89

4.23!! overall i rekon a friggin tough paper !! !! !!

Reply 8

HarisF1

I didn't do that one completely...

Reply 9

Fointy

Good i'm glad most people here think it was harder than past papers...most people at my school thought it was a similar difficulty to past ones.
Means the grade boundaries should be a bit nicer.

Reply 10

boffin_89

nearly everyone in my college said it was harder than previous papers!! and also.. BIOLOGY TOMORW EEEK!

p.s. qu on partial pressures was a wee bit harddddddddd !

Reply 11

happy-and-lost

Oh! Q1, last bit. Why was the partial pressure over half? Couldn't figure that one out at all!

Reply 12

HarisF1

I found it pretty easy... But the last time I found CHM4 easy was when I got 53-D. Starting to get nervous about it...

Reply 13

HarisF1

happy-and-lost

Oh! Q1, last bit. Why was the partial pressure over half? Couldn't figure that one out at all!

I wrote that when V is reduced, the pressure increases. Equilibrium works to decrease pressure, so favours the backward reaction towards Hydrazine.

Reply 14

Botticello

Easier than january (that was a hideous one) and the organic bits were easier and the maths was alright.

The problem I had was the distinguishing thing -
Bromine water for benzene
KMnO4 for the ketone/ acid, which i think is wrong ( ketone doesnt decolourise,)
K2Cr2O7 for the alcohols - I think thats right
I wrote the bottom 2 the wrong way round and changed the numbers and did swaps arrows to make the Mn reagent for the ketone/acid

Reply 15

zzzzzoe

there wasnt a question 8?

Reply 16

zzzzzoe

i thought it was quite a hard paper too, especially tthe first question. thought a lot of section B was easy though hmmmm

Reply 17

apple18

What did u guys have for the deduce the PH when 100cm3 of water is added? I said it doesnt change so quoted the PH they gave.

Reply 18

boffin_89

yes same! i rote 4.20 again :smile:

Reply 19

Zwitter Ion

I thought the paper was hard....
I made a very silly mistake on the last question i was running out of time although i knew you had to compare chemical shifts! and the compound Q i thought was 1-4-methyl ethanoate :s-smilie:

and the other one i wrote was ethanoic anhydride ..
I reallyy hated the question on isomerisim with the different peaks...For the question asking us to distinguish between cyclobenzene and benzene i really didnt know what to write and so resorted to writing that one forms nitrobenze and the other dosent as it dosnt contain delocalised electrons however now im having second thoughts as it was bromine water :frown: