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

1. (Original post by darkiee)
I doubt Buffer would come up again, it already came up twice like an essay question, if it comes out it cant be for 7marks or nothing like that,
thats true !

can you quickly explain the concept of feasibility of a reaction in terms of entropy..
when i think i understand it, i find out i dont
2. (Original post by Ayostunner)
thats true !

can you quickly explain the concept of feasibility of a reaction in terms of entropy..
when i think i understand it, i find out i dont
Basically watch this clips, he teaches good

^=delta

^G= ^h-t^s

if ^G<0 reaction is feasible,

and That man explains it well as I dont know what part you dont understand
3. (Original post by darkiee)
Basically watch this clips, he teaches good

^=delta

^G= ^h-t^s

if ^G<0 reaction is feasible,

and That man explains it well as I dont know what part you dont understand
Thanks
4. (Original post by Ayostunner)
Thanks
No Problemo, you will enjoy his lesson, I hope OCR doesnt mess up and ruin my chance of UNI
5. (Original post by darkiee)
LOOL so do i, goodluck AYO, bornhaber or enthalpy change of solution defo is coming, I can bet my house on that. Also essay on Transition metal, lattice eenthlapy or STANDARD ELECTRODE POTENTIAL
Lol like the 20 mark one in the specimen?
6. (Original post by darkiee)
LOOL so do i, goodluck AYO, bornhaber or enthalpy change of solution defo is coming, I can bet my house on that. Also essay on Transition metal, lattice eenthlapy or STANDARD ELECTRODE POTENTIAL
Buffer are more or less guaranteed to come up cos OCR love them. And what do you mean by the essay on Lattice Enthalpy and Standard Electrode Potential??
7. arghhhhh
8. (Original post by sportycricketer)
Buffer are more or less guaranteed to come up cos OCR love them. And what do you mean by the essay on Lattice Enthalpy and Standard Electrode Potential??
The long questions, worth like 7-11 marks where you have to explain yaself well
9. (Original post by Sereni)
Lol like the 20 mark one in the specimen?
Yeah Like that very scary
10. Early start, hope I don't fall asleep in the exam lol
11. wen do u use a pt electrode in a half cell?
12. (Original post by raj16)
wen do u use a pt electrode in a half cell?
when the other half cell is a non-metal
13. (Original post by Flux_Pav)
when the other half cell is a non-metal
thanks wat about wen the charges r different? like Cu2+ and Fe3+?
14. (Original post by Flux_Pav)
when the other half cell is a non-metal
What about an Fe2+/Fe3+ pt half cell joined to a Copper strip/Cu2+ half cell?
15. (Original post by raj16)
thanks wat about wen the charges r different? like Cu2+ and Fe3+?
For Charges and Non Metals

Pt is used

lets Say Fe2+ --> Fe3+

and

2Br- ---> Br2.

But the Solution contain "Equimolar Amouts of the Product and Reactant"

IOW, The solution should have 1 Mol Br-/Br and a Platinum Catalyst.
16. (Original post by raj16)
thanks wat about wen the charges r different? like Cu2+ and Fe3+?
this is an exception because the two metals exist in more than one oxidation state so platinum electrodes used
17. Haven't seen a question about calculating buffers yet, you can bet your life there will be one today.
18. is the rate constat, K, only affected by temperature too? just like Kc?
19. Zn ---> Zn2+ + 2e (-0.76)
if you increase the concentration of Zn2+, euilibrium shifts to the LHS.
Why does the whole cell potential be lower?

Cu2+ + 2e ---> Cu (+0.34)
increasing Cu2+, it shifts to the RHS
why is the whole cell potential higher?

is the end point of manganese and iron titration from colourless to the first hint of permanent pink?

if someone can help me with that, thank you.
20. cheers, cleared that confusion up , can any1 quickly explain oxidation numbers please,???

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