Chemistry unit 6 June 2016

Original post by Ayman!

No, it's alright to discuss IAL straight away because most people sit the exams at the same time. TSR closes down the threads for the ones that aren't fine to discuss.

Anyway, what were all of your errors for the last experiment?

Vanadium electrode and the wrong salt bridge. Also not sure about this but i wrote that V3+ ions should not be added as they will produced after reduction

Reply 222

Mehodax

This paper was supposed to be the easier one of the trio! :tongue:

I dread to think what else Edexcel has in store for us. Will find out only in June

And to think we were relying on this paper to rescue our overall grade xD

Reply 223

Original post by RizK

oh my god
i forgot that step
i screwed up the next one too

It's not like I got the same answer with that step...but close.. :s-smilie:

Reply 224

rheabehrends

The concentration of the Aluminium solution should've been 0.5 moldm3 because the thing dissolved in he solution had Al2

Reply 225

Original post by RizK

-pt wire should be salt bridge
-Vanadium electrode cannot be used
-H should be in 2mol concentration

I wrote about the Pt wire & salt bridge.
-the Al and V half cells were the other way around...cause I remember our teacher saying that the more reactive one should be on the left? Idk
- and wrote about excluding H+

Unfortunately, I think only the salt bridge part is right.

May the grade boundaries be in our favour!

Reply 226

Original post by rheabehrends

The concentration of the Aluminium solution should've been 0.5 moldm3 because the thing dissolved in he solution had Al2

But for it to be standard shouldn't it be 1.00 mol dm-3 ?

Reply 227

TheMadHatteress

15

What do you guys reckon the grade boundaries will look like? :frown:

Reply 228

RizK

20

Original post by xbuttermelon

I wrote about the Pt wire & salt bridge.
-the Al and V half cells were the other way around...cause I remember our teacher saying that the more reactive one should be on the left? Idk
- and wrote about excluding H+

Unfortunately, I think only the salt bridge part is right.

May the grade boundaries be in our favour!

Question was about the setup, not the diagram :tongue:

so its alright even if it was the wrong way..

Yes, may the grades be ever in our favour

Reply 229

Ayman!

15

Original post by RizK

-pt wire should be salt bridge
-Vanadium electrode cannot be used
-H should be in 2mol concentration

Original post by good_a_level_guy

Vanadium electrode and the wrong salt bridge. Also not sure about this but i wrote that V3+ ions should not be added as they will produced after reduction

I wrote the first two points of both of your answers, unsure about my last one.

Original post by xbuttermelon

I- and wrote about excluding H+

This was my last point, haha - not sure how valid it is, but I feel like it's wrong. :redface:

Original post by TheMadHatteress

What do you guys reckon the grade boundaries will look like? :frown:

No clue - I really, really hope it's something like the January paper's boundaries (or lower!). Do any of you feel like this was harder than that one?

Reply 230

good_a_level_guy

Original post by TheMadHatteress

What do you guys reckon the grade boundaries will look like? :frown:

This one was even harder than Jan 16 so logically grade boundaries should be similar or a bit lower but you never really know :/

Posted from TSR Mobile

Reply 231

rheabehrends

Original post by xbuttermelon

But for it to be standard shouldn't it be 1.00 mol dm-3 ?

Yes, you needed the Al^3+ to be 1 moldm-3, so when something with Al2(blahblah) dissolves, then you get twice as much... its just mole ratios

Reply 232

Original post by rheabehrends

Yes, you needed the Al^3+ to be 1 moldm-3, so when something with Al2(blahblah) dissolves, then you get twice as much... its just mole ratios

I see.. I wonder just how much did I mess up :colonhash:

Reply 233

aldamon

i actually BARELY mangaed to finish in time, the thing was so damn long for me for some reason
i didn't even get to finish the last part of the last question, i wrote plat wire used and filter ppr soaked in conc potassium nitrate should be used, and vanadium electrode used for mistake, and plat electrode used for correction, i couldnt think of the last mistake in time IM SAD

Reply 234

aldamon

Original post by Angelina johnson

What was the Kc value ?

KC vaule for me in 3 sig fig was 0.351, same with my friend

Reply 235

sonam_28

What were the burette and pipetter answers? Does the volume change?
And was zinc Zn(OH)6 or Zn(OH)4???

Reply 236

Kash97

Sm1 plz tell me that the grade boundary for a* will b below 30 this time?? Plz share yr expected grade boundaries!! I m too scared 😭

Reply 237

abdullahharis

Original post by Kash97

Sm1 plz tell me that the grade boundary for a* will b below 30 this time?? Plz share yr expected grade boundaries!! I m too scared 😭

LOL all we have to is hope for the best

Reply 238

AvWOW