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

1. am i right in thinking there are only three papers for us to practice with??
june 2010
jan 2011
and a specimen?
2. (Original post by Flux_Pav)
it is the voltage when no current flows
so like the cell potential but what does it actually mean??
3. (Original post by Perky perks)
what is e.m.f??
electron motive force..... so the ability of an electron to readily be lost. The greater emf value the more oxidising ability
4. (Original post by volvicstar)
silly question but how do you work out concentration?
....moles divided by volume
5. (Original post by Jtking3000)
....moles divided by volume
lol...
6. (Original post by volvicstar)
silly question but how do you work out concentration?
n=c x v if v is is dm^3 if it's in cm^3 then divide it be 1000.
7. (Original post by Perky perks)
so like the cell potential but what does it actually mean??
tbh i don't know the deeper understanding - i'm just memorizing definitions LOL it works for me
8. (Original post by asem93)
electron motive force..... so the ability of an electron to readily be lost. The greater emf value the more oxidising ability

(Original post by Flux_Pav)
tbh i don't know the deeper understanding - i'm just memorizing definitions LOL it works for me
Thanks guys
9. actually, I'm a bit confused on free enrgy feasiblity. Can someone go throug all the options explaining them, please?
10. How does concentration of one solution in a half cell affect the Electrode Potential? How do you if it will be higher or lower?!
11. (Original post by sportycricketer)
How does concentration of one solution in a half cell affect the Electrode Potential? How do you if it will be higher or lower?!
You use le Chatelier's principle...For example if you increase conc of Cu2+ in Cu2+ + 2 e- =Cu equilibrium moves to the right to minimise change so electrons are removed from the equilibrium causing electrode potential to become less negative (higher).
12. (Original post by sportycricketer)
How does concentration of one solution in a half cell affect the Electrode Potential? How do you if it will be higher or lower?!
If the concentration is different, e.g. not standard conditions, then the Electrode Potential will be different from the Standard value given in the table.
If its lower or higher depends on which half cell (Oxidising agent or reducing agent) has had its concentration changed.

I believe.
13. How do you calculate lattice enthalpy using enthalpy changes of solution and hydration ???
14. (Original post by 2141)
How do you calculate lattice enthalpy using enthalpy changes of solution and hydration ???
you have to use the other form of Born Haber cycle...

Solution + LE = Hydration

Then you rearrange accordingly...... I think anyway (maybe wrong, this is from memory)
15. (Original post by HappyEverLaughter)
You use le Chatelier's principle...For example if you increase conc of Cu2+ in Cu2+ + 2 e- =Cu equilibrium moves to the right to minimise change so electrons are removed from the equilibrium causing electrode potential to become less negative (higher).
so more electrons removed the higher the electrode potential is?? and vice versa?
16. (Original post by sportycricketer)
so more electrons removed the higher the electrode potential is?? and vice versa?
Yes.
17. Does pKa = pH?
18. (Original post by SteveScott)
Does pKa = pH?
NO! NO! NO!
19. (Original post by Perky perks)
what is e.m.f??
Electromotive force.
20. (Original post by SteveScott)
Does pKa = pH?
OH GOD NO! don't get yourself confused 3 hours before the exam.
just forget you ever said that....in fact can you delete it so no one else reads that and questions themselves.

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