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OCR Salters B F334 Chemistry of Materials (24/06/2011)

arianna.k

I have no idea if this has been made yet...

So about a week to go. I'm so nervous, I didn't do it in jan :afraid:

Post papers, tips, answers etc
(and of course after exam discussion which I dread but need to satisfy my fears)

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did u do the F335?

F334 papers GALORE!!!!
http://www.4shared.com/file/9Dw-fIEy/f334.html

Reply 3

tkoki1993

Can someone PLEASE explain electrode potentials to me...or know a website I could go to at least thanks

Reply 4

feelbetter

Original post by tkoki1993

Can someone PLEASE explain electrode potentials to me...or know a website I could go to at least thanks

This may help :smile:

037_Standard_Electrode_Potentials_and_Cells.pdf82.7KB

Reply 5

tkoki1993

Original post by feelbetter

This may help :smile:

thanks... I just did like 8 Standard electrode potential questions... did not go well... I got every question wrong... lol

Reply 6

arianna.k

Original post by Intellectual Smart G

did u do the F335?

yes i did. and i ****ed it. spectacularly

you??

Reply 7

feelbetter

Original post by tkoki1993

thanks... I just did like 8 Standard electrode potential questions... did not go well... I got every question wrong... lol

Lol you'll get the hang of it. It took me a while to get a hang of it the first time round.

Reply 8

Spepper90

Original post by tkoki1993

thanks... I just did like 8 Standard electrode potential questions... did not go well... I got every question wrong... lol

What do you wanna know? Basically if your given two half cell values and the most negative is A and most positive is B then:

-(A)+B= value.

Reply 9

DCRichards

Original post by tkoki1993

Can someone PLEASE explain electrode potentials to me...or know a website I could go to at least thanks

In short:

--> Ecell = E(more positive potential) - E(more negative potential)
--> Ecell is ALWAYS positive.
-->The equation with the more negative potential becomes the negative electrode (cathode). The less negative becomes the positive electrode (anode).

-->To combine the half equations:

1. flip the more negative (so the electrons are on the right
eg. Cu --> Cu2+ + 2e-

2. Balance the number of electrons:

eg Fe3+ + e- --> Fe2+ would become
2Fe3+ + 2e- --> 2Fe2+

3. Add the equations, removing the electrons:

2Fe3+ + Cu --> 2Fe2+ + Cu2+

--> If one thing is a stronger reducing agent (the more negative one, the one which loses electrons and is oxidised) than another, then one will supply electrons to the other in a half cell, like the example above. This means that it is likely that these would react. Remember though that they may not react as the activation enthalpy of the reaction may be too high (this could easily be one of those sneaky one mark questions).

This is pretty much all you need to know I think. Sorry this is so brief, but I hope it helps a little. If you have not done so, try the January 2008 CofM paper, as it has a nice electrode question, and the example I gave above is from that question :smile:

Edit: there is also a slightly long winded, but quite nice explanation on here: http://www.chemguide.co.uk/physical/redoxeqia/introduction.html :smile:

(edited 12 years ago)

Reply 10

sBoon

I think this list covers most of the topics likely to be in F334.

Electrode potentials.
Kinetics (order of reactants).
Transition metals (their colour and ligands).
Polymers (bonding and property change with temp).
Optical isomerism (amino acids).
FeCl3 as phenol test.
Synoptic topics (esp. mass spec; IR; chromatography)

Can anyone add anything else?

(edited 12 years ago)

Reply 11

feelbetter

Original post by sBoon

I think this list covers most of the topics likely to be in F334.

Electrode potentials.
Kinetics (order of reactants).
Equilibrium constants.
Transition metals (their colour and ligands).
Polymers (bonding and property change with temp).
Optical isomerism (amino acids).
FeCl3 as phenol test.
Synoptic topics (esp. mass spec; IR; chromatography; NMR)

Can anyone add anything else?

NMR won't be in their, neither will equilibrium constants (i.e Kc, they're only f335) However I feel a translation/transcription question will probably come up.

Reply 12

Mr.Messy

I hope they give us loads of rate of reaction calculation questions. Love that.
Hate it when they make us draw the graph though.. but then again its just plotting in a few numbers find the relationship and maybe the half life, easy 3/4 marks!

Feeling better about this paper than unit 4 seeing as though its not that synoptic tbh. But I hope the examiners don't **** us over like on Wednesday. *****.

Reply 13

sBoon

Original post by feelbetter

NMR won't be in their, neither will equilibrium constants (i.e Kc, they're only f335) However I feel a translation/transcription question will probably come up.

NMR occasionally pops up, but only 1-3 marks
Kc - Jun 09 Q1 f

Reply 14

feelbetter

Original post by sBoon

NMR occasionally pops up, but only 1-3 marks
Kc - Jun 09 Q1 f

June 09 was the old specimen :smile:

they altered it slightly since then, taking away the nmr etc, which is onlyf335, even though it'svery similar. They changed it when the new a* grade was introduced, they only papers that have been for this specimen are jan 10, jun 10 and jan 11 :smile:

It was paper 2849 back then not f334,but it's still very similar though :smile:

Reply 15

sBoon

Original post by feelbetter

June 09 was the old specimen :smile:

It was paper 2849 back then not f334,but it's still very similar though :smile:

I'll take your word for it, updated the original post :smile:

Reply 16

AGM

I feel a bit more confident doing this exam now I've done F335. I feel a lot of this topic lays the foundations for F335, but I don't want to speak too soon! Could be a nightmare come Friday.