Chemistry unit 6 June 2016

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At least know the simple chromatography for seperation of the amino acids.

Don't forget the different types of chromatography and ofcourse the phases and most of all learn the technique, it may come as a question in the form of parts

Reply 201

Adorable98

Original post by abdullahharis

Don't forget the different types of chromatography and ofcourse the phases and most of all learn the technique, it may come as a question in the form of parts

Which past paper have you seen it ?

Reply 202

abdullahharis

Original post by Adorable98

Which past paper have you seen it ?

I don't quite recall which paper however there is a likely chance that a question like this may come and you could always refer your notes or the text book

Reply 203

Adorable98

This question doesn't make sense in (iv).
the iron (ii) sulfate was titrated with a solution of acidified potassium manganate(VII) but the value was lower than (v)

whereas (v) was measured using an ecell and it's value was higher than iv.

So shouldn't the answer be Fe²⁺ was oxidised by potassium manganate or am I reading the whole question wrong :redface:

??

http://qualifications.pearson.com/content/dam/pdf/International%20Advanced%20Level/Chemistry/2013/Exam%20materials/Question-paper-Unit-6-(WCH06)-June-2014.pdf

Question 2(c)(viii)

jkj.png39.2KB

Reply 204

PlayerBB

Original post by samb1234

Whenever you see 'white' and a transition metal in the same sentence, this will always be the way to go about it as all transition metal compounds are coloured unless they have full d orbitals.

Thank you!! Do you know the difference between a high resolution and low resolution NMR other than the high allow for the splitting pattern to be observed ? And for the NMR spectrum, the hydrogen environments that are shielded, their chemical shift will be closer to zero or much further from zero ?

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(edited 7 years ago)

Reply 205

samb1234

Original post by PlayerBB

Do you know what chemical shift actually is? The only real difference between high and low res is being able to see splitting patterns

Reply 206

RizK

WHAT IN THE NAME OF HOTH WAS THAT!?
An excuse for slaughter, that paper :L

Reply 207

Ayman!

Felt like it was a Unit 4 or Unit 5 paper. It wasn't that difficult in hindsight, but I will not do well because I expect grade boundaries to be a little steep.

Edit: most of my friends believe that the scaling will be similar to that of the Jan paper. I do hope so!

(edited 7 years ago)

Reply 208

Amit_deb

It was more of a theorical practical paper T_T my equilibrium answers are pretty ****ed up.

Reply 209

pinksmartiee

Thats was SO BAD... It couldn't be worse. Will and when would we get a theoretical mark scheme?

i died

I wanted to cry 😭

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Reply 212

Nimra99

I think grade boundaries are going to be low.... Hope for the best

Reply 213

Angelina johnson

What was the Kc value ?

Reply 214

RizK

Original post by Angelina johnson

What was the Kc value ?

Don't discuss the paper within 12 hours. You will only raise the grade boundaries.

That being said, I kept getting 0.056 for that show that question, wtf

Reply 215

xbuttermelon

Original post by RizK

Don't discuss the paper within 12 hours. You will only raise the grade boundaries.

That being said, I kept getting 0.056 for that show that question, wtf

SAME! Then i went ahead a subtracted from the initial moles and got 0.097 lol so close idk what happened

Reply 216

Mahmuduls3

Can anyone tell me how to find the moles in question no. 2??

Reply 217

Ayman!

Original post by RizK

Don't discuss the paper within 12 hours. You will only raise the grade boundaries.

That being said, I kept getting 0.056 for that show that question, wtf

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?