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Equilibria, Energetics and Elements (F325) - June 2011 Exam.

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Horrible paper :/ all through lessons i've been quite good at the rates, acids, Kc, all of the maths parts, so I pretty much ignored those in my revision and have done three solid days of transition metals as I hate those and could never remember the reactions or colours, but then hardly any of that came up! and i can't remember once being asked for a colour :frown:

so was a complete fail. I actually quite like the 2,2'-bipy question lol :P doesn't mean I got it right though. Really hope I didn't do as badly as I think I did because even if the grade boundaries are as low as they usually are, I didn't get higher than a D maximum, but I need a B, preferably an A for University :frown:

Sorry for the long post!

Reply 1861

abloomfield

I got 720 for kc.. so many people got like 45 :s-smilie:

Reply 1862

Teva

Original post by Jsmalley1

720 for the value of Kc?

yeah me too, except im not sure what the right answer is... :/

Reply 1863

bl0b

i used ethanoic acid and sodium ethanoate for the magic tang and got a ratio of 1 to 200 and something :s-smilie:

Reply 1864

student777

Original post by Kalamari Dave

Yes!

That monomer unit question was a bit random, no?
And did you just have to find the difference in the half cell voltages for that one mark for Ecell? I did that, but i'm not sure because one produced 1 electron, the other took 2 :s-smilie:

hjhsadfjklhasdjklhjkfladskflhadjklfsdjf

So random!
You just had to take one from the other, electrode potentials are not dependent on the amount of electrons produced. That's what my revision guide says anyway :P

Reply 1865

sk_93

the worst exam ever. ran out of time and missed the 9 marker at the end. did all the past papers and got a's on those i doubt i'll even get c on this. hate ocr

Reply 1866

KnuckleheadNinja

Original post by brobro

i thought the biology was a piece of piss compared to this. This chem paper was the hardest ever.

agree. some people walked out of my school crying after the chem this afternoon.

Reply 1867

joe3469

Original post by GreenVet

I thik i got the same too, just the Magic Tang question and some ionic equations caught me out.

Omg similar to me. Some ionic equations were annoying (especially the CaOH and acid one, couldn't balance for the H20 so added a H2) and the electrolyte producing O2 and H2 was dodgy too. Although I think I blagged the Magic Tang by saying how its not just about pH but also the taste of the acid and about making a conjugate base and acid and using ph=pka + log (A-/HA) to get a ratio (even though I used lactic acid cos I thought it had to one from the table). I think I choked the polymer question too (started drawing it as the invigilators started collecting papers) and only put half the cycolamine thing linking the monomers...

(edited 12 years ago)

Reply 1868

J DOT A

Very very hard paper.... even my Chemistry teacher who has a PHD said that was a "*****".

Reply 1869

jontylol

Was there an actual method to working out which acid to use for the 'magic tang'? Because i said that all the acids would work so i just picked lactic acid and went with it :/ And i got a 1:2 ratio of salt:acid

Reply 1870

JakeChocz

Original post by abloomfield

I got 720 for kc.. so many people got like 45 :s-smilie:

I got it in the 700's aswell, can't remember exactly but I think the 45 would come from if you deduced BR2 as second order and 700's if you got it as first order? I could be wrong though

Reply 1871

Sceaga

Original post by bl0b

i used ethanoic acid and sodium ethanoate for the magic tang and got a ratio of 1 to 200 and something :s-smilie:

that sounds ok , I used acetic acid and got 16:1

Reply 1872

Gemma2010

A girl waqs crying in my college :frown:

I swear we got the worst questions all in one paper - most haven't even come up at all in the past papers - and i evern did a couple legacy ones :frown:

damn you Q at the end and buffer Q with only a PH and Pka value!!!!

Reply 1873

*QueenBeee

Original post by Sceaga

did everyone else get -108 for the gibbs question?

Yes!!! im pleased hahaaa

Reply 1874

viksta1000

that paper was 'orrible....seems OCR didn't learn from that horrible exam in January....looking forward to OCR embarrassing themselves with a 50% for an A grade boundary

and if Pat from my school sees this comment....wassup Patrick!!! :biggrin:

(edited 12 years ago)

Reply 1875

KnuckleheadNinja

Original post by J DOT A

Very very hard paper.... even my Chemistry teacher who has a PHD said that was a "*****".