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

just wondering, is there only Specimen, Jan 2011 and June 2010 papers available for this exam not including legacy papers??

Reply 461

nestle

Original post by stellanocte

Wow, very efficient!
Thank you so much!! I need to read questions extraa carefully, haha. :smile:

did you find that on the specimen paper for 2 (d). the mark scheme was x10 out?? or is that just me?
i got 0.013 moldm^-3

and the mark scheme got 0.13?

cos its, [c6h5o-] = (1.3x10^-10 x 0.2) / 1.95x10^-9

which = 0.013

??

Reply 462

blush.ox

15

Original post by TheAwkwardBalloon0

dichromate is orange and CrO42- is yellow :smile:

Why do i not know this? Are these bits of random info im missing out or what? Is it in the textbook? I mean how do you answer a Q like this if you havent seen it before or do i just fail in chem in general :sigh:

.

This exam is seriously stressing me out now, one min i feel like i can do all the Qs and the next i find myself staring at a Q with no idea whatsoever :sad:

.

Why the neg reps? :lolwut:

(edited 12 years ago)

Reply 463

BeekieBoo

I don't know whether this has already been asked, but does anybody have a table/sheet/website or just some pretty notes with all the colours we need to know of complexes of transition metals and reaction with certain compounds?

Reply 464

BeekieBoo

Ok, so I did a bit of textbook searching and with the help of the internet came up with this. Can anybody tell me if something's missing or is something's incorrect!

Hope it helps someone! :smile:

IMAG0134.jpg455.0KB

Reply 465

BeekieBoo

Original post by arvin_infinity

Ive been told that we wont be asked about explaining differences in ligands colour !

There is like 10 mark question in 2007 ..but apparently it was taken out from syllabus some time later

Don't know whether anyone had answered this for you but have a look at my last post :smile:

Reply 466

jontylol

11

http://www.knockhardy.org.uk/sci.htm
There's some great notes and revision materials, its tailored to our spec to so none of the unnecessary stuff. :biggrin:

http://www.knockhardy.org.uk/ppoints.htm
And also lots of power points going step by step through stuff :smile:

(edited 12 years ago)

Reply 467

k256_93

How do you come up with an overall equation?
E.g for the question:

NO(g) + 1/2O2(g) -> NO2(g)
NO2(g) -> NO(g) + O(g)
O2(g) + O(g) -> O3(g)

Reply 468

sportycricketer

Can anyone please answer this question for me? I just want to verify if my answer is correct as the mark scheme may be wrong! My answer is double the answer in the textbook so can the entropy be double the value?

Original post by sportycricketer

Can anyone please answer this question for me? I just want to verify if my answer is correct as the mark scheme may be wrong! My answer is double the answer in the textbook so can the entropy be double the value?

I get -183.1 j mol-1

Reply 470

sportycricketer

Original post by haydyb123

I get -183.1 j mol-1

man thats wrong even in the back of the textbook :P

Reply 471

wilsea05

1

Original post by sportycricketer

Can anyone please answer this question for me? I just want to verify if my answer is correct as the mark scheme may be wrong! My answer is double the answer in the textbook so can the entropy be double the value?

-131.65
its products minus reactants so Na2O- (2xNa+0.5xO2)

Reply 472

ViralRiver

16

Hmm, I haven't even opened up the textbook to start learning the content yet alone revising >< . I'm gonna start today but I'm not in a position where I can devote all my time to it (since it's not really part of my offer) - but something inside me still wants to get a decent grade and not let the last 1.5 years of chemistry go to waste. So with that being said, what are the easier topics to get marks on, where there's not too much application but just quoting formulae, sticking numbers in etc? You know, things such as definitions where you just learn it and they're easy marks? If I can get 46/150 in this I'll be happy - I just don't think I have the time to learn everything xD .

Reply 473

sportycricketer

Original post by wilsea05

-131.65
its products minus reactants so Na2O- (2xNa+0.5xO2)

Yeah I got double that answer :s-smilie:

is that gonna be wrong then?
cos I did
2 x (Na2O) - [(4xNa) + (1xO2)]

Reply 474

jontylol

11

Ahhhh, just worked out i need at least a middle C to meet my offer :'(

Reply 475

Wor Carroll

Original post by k256_93

How do you come up with an overall equation?
E.g for the question:

NO(g) + 1/2O2(g) -> NO2(g)
NO2(g) -> NO(g) + O(g)
O2(g) + O(g) -> O3(g)

You can cancel out the things that are on either side of the equation.
NO cancels
NO2 cancels
O cancels

Leaving O2 + 1/2O2 -> O3 I think :smile:

Reply 476

arvin_infinity

3

Original post by BeekieBoo

Don't know whether anyone had answered this for you but have a look at my last post :smile:

My question is totally different..but dw since its not gonna come up
Thanks for reply :wink:

Reply 477

k256_93

Original post by Wor Carroll

You can cancel out the things that are on either side of the equation.
NO cancels
NO2 cancels
O cancels

Leaving O2 + 1/2O2 -> O3 I think :smile:

Awesome, thank you very much :smile:

Reply 478

Teva

Original post by nestle

did you find that on the specimen paper for 2 (d). the mark scheme was x10 out?? or is that just me?
i got 0.013 moldm^-3

and the mark scheme got 0.13?

cos its, [c6h5o-] = (1.3x10^-10 x 0.2) / 1.95x10^-9

which = 0.013

??

i also got 0.013. what's the correct answer?