x Turn on thread page Beta
 You are Here: Home

# Edexcel A2 Chemistry Exams -6CH04 (14th June) and 6CH05 (22nd June) Discussion Thread watch

1. (Original post by Neha121101)
Attachment 554127

hi, could someone explain why this is C. I thought a negative delta S total means that Kp would also be negative?
thanks
https://youtu.be/RW9rinOP5Lg?t=6m8s check this video out. The guy goes through that question.
2. Does anyone have the jan 2016 IAL paper and the mark scheme?
3. please can someone explain june 2013 r paper question 16? dont see why it cant be A?
4. (Original post by ihaspotato)
Thanks! and when do we multiply? like I have solved questions where..

C : H
0.1 : 0.2
becomes
1 : 2 <-- ?

I never really understood at what situation I am supposed to do this.
It's the same process. Divide each number by the smallest number of the group.
0.1/0.1 = 1
0.2/0.1 = 2

Multiplying makes it way too complicated :P
5. (Original post by RUNSran)
Does anyone have the jan 2016 IAL paper and the mark scheme?
hope that helps
Attached Images
6. Jan 2016W QP.pdf (516.8 KB, 39 views)
7. Jan 2016W MS.pdf (269.6 KB, 48 views)
8. (Original post by RUNSran)
Does anyone have the jan 2016 IAL paper and the mark scheme?
Attached Images
9. Jan 2016 QP.pdf (516.8 KB, 52 views)
10. Jan 2016 MS.pdf (269.6 KB, 35 views)
11. (Original post by Z.e.e)
hope that helps
Nooooo you beat me!!!! :c
12. (Original post by Blazyy)
Nooooo you beat me!!!! :c
ahhh sorry
13. (Original post by Z.e.e)
https://youtu.be/RW9rinOP5Lg?t=6m8s check this video out. The guy goes through that question.
thanks!
14. (Original post by Blazyy)
It's the same process. Divide each number by the smallest number of the group.
0.1/0.1 = 1
0.2/0.1 = 2

Multiplying makes it way too complicated :P
Oh man! all this time I was thinking they were multiplying by 10

Thanks a lot mate! best of luck for your exam and revision!
15. (Original post by Z.e.e)
Attachment 554137

How would you go about this question? I'm guessing the increase is due to ppt being made and the decrease is due to ppt dissolving. How would you find the formula??

Thanks
Reading the graph, the maximum colour intensity should be looked at.

The ratio of the volume of X to the volume of Y at the maximum colour intensity should give you rough numbers that can help you with determining the formula.
16. (Original post by Neha121101)
Attachment 554127

hi, could someone explain why this is C. I thought a negative delta S total means that Kp would also be negative?
thanks
You kind of have to think a bit mathematically about this. You rightly point out that ΔStotal is proportional to Kp

The relationship is ΔStot = RlnK

Knowing R is a positive constant, we need a value of K which makes the RHS negative. Natural log of any positive number less than 1 will do this, hence C is the correct answer.
17. (Original post by Z.e.e)
ahhh sorry
Thank you very much guys
18. (Original post by Funky_Giraffe)
You kind of have to think a bit mathematically about this. You rightly point out that ΔStotal is proportional to Kp

The relationship is ΔStot = RlnK

Knowing R is a positive constant, we need a value of K which makes the RHS negative. Natural log of any positive number less than 1 will do this, hence C is the correct answer.
You don't really tbh. Can't be negative as pressure/pressure would never be -ve as partial pressure >=0. Reaction unfavourable so will be less products than reactants so since kp =partial pressure products/reactants if reactants is bigger then kp less than 1
19. guys, is there the unofficial mark scheme for unit 4? 😊

jan 2015 IAL paper - ew
21. Why is the answer B? Couldn't it also be A?
22. hey guys i was wondering if you knew any papers that had questions on copper and chromium complexes have a real hunch theyre gonna come up?!
ALso any questions of back titrations - thiosulfate and persulfate or permangenate
23. (Original post by noctisff)
Why is the answer B? Couldn't it also be A?
It cant be A becaue for Ag silver to be a reducing agent you would have to flip the second half eqution and therefore the sign would change from +0.8 to -0.8 and since -0.8 is less than 0, it is a weaker reducing agent.
Remeber the values they give you are the reduction potentials . In that equation silver was being oxidised .
Do you get it now?
24. (Original post by noctisff)
Why is the answer B? Couldn't it also be A?
samb1234 can you explain pls?

Turn on thread page Beta
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: September 21, 2016
Today on TSR

### Four things top students are doing

Over the Easter break

Poll
Useful resources

## Make your revision easier

Can you help? Study Help unanswered threadsStudy help rules and posting guidelines

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE