[matt1107]

I sear it only asked for the 3d shape of the ligand, so would you have had to have included the brackets and charge?

[Princess Kawaii]

(Original post by InkyOne)
+3 - water was the ligand (and carries no charge) so the charge came from the central metal ion

Wasn't it NH2CH2CH2NH2 that was the ligand not water....is it same charge then?

[misspinx20]

(Original post by InkyOne)
I must say, this whole thread is just leading to one massive facepalm for me... I thought I knew it before the exam, I understand it now, but whilst in the exam? Nothing Bye bye Uni! I'm off to join the circus!

Exactly how i feel at the moment as well! Oh well i'm sure they'll get the grade boundaries down...all we can do is wait for results day....*sigh*

[sydney07]

How many didn't see the last question? Because I'm almost positive it said 'end of questions' before that question... and OCR normally has lots of additional lined paper at the back for you, if you need more space to write answers :/

[hannahwah]

(Original post by bateson1992)
Iron was the stronger oxidising agent electrons flow from most negative to least negative, chromium is -0.74 iron is -0.44, iron redued

Cr-----> Cr3+ 3e-

Do yall think il get the mark for saying chromium was the stronger reducing agent, rather than the other way around?

[mmmcitrus]

(Original post by icedragon)
So I did moles of Na2CO3 = 0.6625/106 = 6.25 x 10^-3. The moles of that in 10.8cm^3 is given by (6.25 x 10^-3) x (10.8/1000) = 6.75 x 10^-5. Its a 1:2 ratio from the equation so doubling that gives 1.35 x 10^-4 moles of cinnamic acid. Multiplying that by the Mr gives 0.0200 (to 4sf which the whole question was in) grams of cinnamic acid.

That's what I got anyway.

Thats what I got too, I hope were right I don't wanna have to redo the year or anything

[sydney07]

can we have more votes on http://www.thestudentroom.co.uk/show....php?t=2036476 to predict grade boundaries (: thanks

[sydney07]

(Original post by bsyedg)
Please, please, please tell me there is someone else who didn't see the 5 mark calculation on the back?! D:

I didn't notice it until 2mins before the "Pens down", I'm sure it said 'end of questions' before that question though haha, and there normally is lots of additional lined paper at the back...

I finished 10mins early, then checked through most of my answers then decided to flip the paper over and saw the 5 marks and lots of information and concentrations and volumes, heart sank!

[sammey123]

I multiplied 0.02grams by 20 cos the calculation find mass in 50cm3 whereas answer wants in 1dm3 i think.

Answer i got was 0.4grams which coincided with a friends answer (whos cambridge entrant....)

[montstar]

I also got 0.4g. I know someone who didn't see the back questions. Sneaky sneaky.

[Oliverfk93916]

(Original post by sydney07)
I didn't notice it until 2mins before the "Pens down", I'm sure it said 'end of questions' before that question though haha, and there normally is lots of additional lined paper at the back...

I finished 10mins early, then checked through most of my answers then decided to flip the paper over and saw the 5 marks and lots of information and concentrations and volumes, heart sank!

100% you will never make that mistake again :P I always check the back of every paper just out of curiosity before the test starts.

[bssjonny]

I must say that exam really made me think........about what i'll be doing in my inevitable gap year

[bateson1992]

(Original post by hannahwah)
Do yall think il get the mark for saying chromium was the stronger reducing agent, rather than the other way around?

yep

[racing_stripes]

Please can someone upload the paper with an unofficial marksheme. This paper was really hard

[misspinx20]

(Original post by InkyOne)
Grade boundaries predictions anyone? My guess would be a pretty average 64-65...

For an A? yeah that's why i'm thinking....because there were so many places where you could make small silly mistakes and so lose so many marks!

[bssjonny]

I think that at the end of all tests where there is a question on the back page, they should have written on the page before that, "THERE IS A QUESTION ON THE NEXT PAGE!"

[Anthony Soprano]

(Original post by bssjonny)
I think that at the end of all tests where there is a question on the back page, they should have written on the page before that, "THERE IS A QUESTION ON THE NEXT PAGE!"

They do, it says "please turn over for question 4f or 4whatever", and at the end it says "End of paper" :P

[sydney07]

(Original post by Oliverfk93916)
100% you will never make that mistake again :P I always check the back of every paper just out of curiosity before the test starts.

Yeah, I won't! My next (and last ) exam is biology on Friday, and the last question is worth 25 marks! So I think I'll keep my eye out for that one haha

[brucethedog]

(Original post by bssjonny)
I think that at the end of all tests where there is a question on the back page, they should have written on the page before that, "THERE IS A QUESTION ON THE NEXT PAGE!"

I completely agree! Under exam pressure it's so easy to miss things like that... there was also a gap between the last (ehem second the last) question and the bottom of the page, so my eyes just skimmed it. Ah! Such an idiot.

[Tan Theta]

Does any one have the paper or a mark scheme for this paper?