[SmithytheDrummer]

(Original post by DavidMRoper)
What was question 6? Or have you labelled it wrong


This was posted from The Student Room's iPhone/iPad App

to my knowledge there were only 7 questions and the person that begun this mark scheme labelled it wrong to start with and I forgot to change it.

[rain_039]

For the Co2 in equilibrium question. I said that the Co2 reacts with the H20 and it causes a decrease in the concentration of H20 so the equilibrium shifts to the left side to restore the lost H20. This was a last minute thought.

[otrivine]

(Original post by rain_039)
For the Co2 in equilibrium question. I said that the Co2 reacts with the H20 and it causes a decrease in the concentration of H20 so the equilibrium shifts to the left side to restore the lost H20. This was a last minute thought.

i think u would get 1/2 marks u should say shift to right?

and the question on feasible i said cause temp increase deta g>0 therefore not feasible and i said like deta h - deta t s will become more postivie as temp increases so not feasible something along those lines?

[RTJP]

How can anyone remember what answers whatanswers they gave ! I am just wondering how the grade boundaries will be hopefully not too high !

[njb]

I know it's late, but for the question:

"b) Using Cu2+, give example of a precipitation reaction and ligand substitution reactions including colour changes/observation, reagents and balanced equation (6)"

Would using [Cu(H2O)6]2+ + 4Cl- -> [CuCl4]2- + 6H2O be sufficient?

I haven't seen anyone use this formula, but I think it's correct - I mentioned the colours changes (blue->green->yellow) and using concentrated HCl as the reagent. Could someone just confirm whether this is right?

Thanks very much

[myyrh]

(Original post by njb)
I know it's late, but for the question:

"b) Using Cu2+, give example of a precipitation reaction and ligand substitution reactions including colour changes/observation, reagents and balanced equation (6)"

Would using [Cu(H2O)6]2+ + 4Cl- -> [CuCl4]2- + 6H2O be sufficient?

I haven't seen anyone use this formula, but I think it's correct - I mentioned the colours changes (blue->green->yellow) and using concentrated HCl as the reagent. Could someone just confirm whether this is right?

Thanks very much

Yeah that would be fine.

[otrivine]

(Original post by njb)
I know it's late, but for the question:

"b) Using Cu2+, give example of a precipitation reaction and ligand substitution reactions including colour changes/observation, reagents and balanced equation (6)"

Would using [Cu(H2O)6]2+ + 4Cl- -> [CuCl4]2- + 6H2O be sufficient?

I haven't seen anyone use this formula, but I think it's correct - I mentioned the colours changes (blue->green->yellow) and using concentrated HCl as the reagent. Could someone just confirm whether this is right?

Thanks very much

Yes is fine want to discuss the paper

[otrivine]

(Original post by myyrh)
Yeah that would be fine.

hi myyrh can i ask quickly you know where we had to complete the born harber if i still put the 1/2F2 instead of F? cause it means same thing is that fine or not?

[myyrh]

(Original post by otrivine)
hi myyrh can i ask quickly you know where we had to complete the born harber if i still put the 1/2F2 instead of F? cause it means same thing is that fine or not?

nope once it's been atomised it becomes F you would lose a mark for writing 1/2F2

[otrivine]

(Original post by myyrh)
nope once it's been atomised it becomes F you would lose a mark for writing 1/2F2

the advantages of methanol i said can be transported easily and can be generated from biomass?

[myyrh]

(Original post by otrivine)
the advantages of methanol i said can be transported easily and can be generated from biomass?

easily transported because it is a liquid (In the past that was required for the mark). Generated from biomass should be okay but it was referring to methanoic acid and not methanol.

[otrivine]

(Original post by myyrh)
easily transported because it is a liquid (In the past that was required for the mark). Generated from biomass should be okay but it was referring to methanoic acid and not methanol.

really but the book did not say liquid said easily transported? snap unless i put but not sure

[myyrh]

(Original post by otrivine)
really but the book did not say liquid said easily transported? snap unless i put but not sure

Yeah in January 2011 you had to state it was a liquid. Unfortunately the book doesn't include all the correct answers needed.

[otrivine]

(Original post by myyrh)
Yeah in January 2011 you had to state it was a liquid. Unfortunately the book doesn't include all the correct answers needed.

lets hope for the best , and was this paper similar to jan 2012 difficulity

[myyrh]

(Original post by otrivine)
lets hope for the best , and was this paper similar to jan 2012 difficulity

yep.

[otrivine]

(Original post by myyrh)
yep.

so boundaries like 76 ?

the question on making salt i mentioned like adding the conjugate base and acid to make salt and siad add NAOh to something cant remember to give salt enough for 2 marks?

[myyrh]

(Original post by otrivine)
so boundaries like 76 ?

the question on making salt i mentioned like adding the conjugate base and acid to make salt and siad add NAOh to something cant remember to give salt enough for 2 marks?

Higher, I'm estimating 78-80. Lol search the thread, you've already asked this question like four times

[otrivine]

(Original post by myyrh)
Higher, I'm estimating 78-80. Lol search the thread, you've already asked this question like four times

hahaha woow high , please is this wrong ? sorry mate cause i didnt quite understand it before

[jukebox123]

(Original post by otrivine)
hahaha woow high , please is this wrong ? sorry mate cause i didnt quite understand it before

Mate can you stop asking stupid questions about grade boundaries, the exam took place a month ago!!
You've got summer holidays for goodness sake, which are for chilling and have fun!

[myyrh]

(Original post by otrivine)
hahaha woow high , please is this wrong ? sorry mate cause i didnt quite understand it before

Here's my reply to the question, It's about as clear as I can explain it.
http://www.thestudentroom.co.uk/show...e#post38147259