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    (Original post by chignesh10)
    What about it?
    the other 2 people got the same answer but its different to the mark scheme and we cant figure out why its wrong.
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    I felt that June 2012 was awful.
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    (Original post by FailedMyExams)
    Wtf, if you add that to the half equation they give you, you get

    CH3OH + O2 --> H2O + 2H+ + 2e- + CO2

    Doesn't balance, neither do charges? Edit: Nvm it does balance I'm blind.

    Can someone shed some light on how you do it please?

    4bii http://ocr.org.uk/Images/65361-quest...d-elements.pdf
    Got the same answer as what you got aswell
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    (Original post by needtosucceed=))
    the other 2 people got the same answer but its different to the mark scheme and we cant figure out why its wrong.
    Well you have to multiply the oxygen half equation by 1.5 to get 1.5O2 and you go from there and you get the mark scheme answer
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    (Original post by Funtry)
    I felt that June 2012 was awful.
    what parts did you find hard? have you done the january 2013, it was much easier than that.
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    (Original post by needtosucceed=))
    what parts did you find hard? have you dont the january 2013, it was much easier than that.
    Yes, I've done Jan 2013, got 96, I got 84 in June 2012. Some of the questions were in my opinion pretty poorly worded, especially the one about the Strongest oxidising agent, as that seems to suggest 1 reagent, not two. I also screwed up the buffer pH question, as I forgot to change the [conjugate base] and so lost ALL 5 marks!! even though everything else I did, my working and all, was correct. Plus the fact that I lost a mark because I put [Ar] for an electron configuration is bull, because it's correct in every other paper I've done.
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    (Original post by chignesh10)
    Well you have to multiply the oxygen half equation by 1.5 to get 1.5O2 and you go from there and you get the mark scheme answer
    why would you multiply it by 1.5?
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    (Original post by needtosucceed=))
    why would you multiply it by 1.5?
    overall equation has 1.5O2 and the oxygen half equation has O2
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    (Original post by chignesh10)
    Well you have to multiply the oxygen half equation by 1.5 to get 1.5O2 and you go from there and you get the mark scheme answer
    oh dear, sent the email for nothing.

    Of course. Very nice.
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    (Original post by Pride)
    oh dear, sent the email for nothing.

    Of course. Very nice.
    no problem
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    (Original post by chignesh10)
    no problem
    what is a use of the trans-platin?
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    (Original post by eggfriedrice)
    Thanks. You've made it really clear.

    Also just to confirm, CuCl4 wouldn't react with aqueous silver nitrate since they're also covalently bonded?

    I have another question (not related to this one), if you or anyone else can explain would be awesome ;

    So in a fuel cell, say a Ni(s) and Ni2+(aq). Why does the Ni(s) gain or lose mass? I really don't understand it.

    I mean surely the only transfer we have are electrons but the mass of electrons are pretty much negligible so how is it possible we even have a measurable change in mass?
    Well Ni2+ in solution probably has the same mass as Ni, mole for mole, subtract the mass of the water. I say probably. Just as dissolved table salt has a mass (well the ions that make it a salt, Na+ and Cl-), even if it doesnt look like it does.
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    (Original post by otrivine)
    what is a use of the trans-platin?
    I don't know lol, i know hte use of only cis-platin
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    How long is everyone taking to complete these papers roughly?

    Any tips for working faster in this exam? Timing always gets me - erghhhh
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    (Original post by überambitious_ox)
    How long is everyone taking to complete these papers roughly?

    Any tips for working faster in this exam? Timing always gets me - erghhhh
    I don't even finish them :P
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    (Original post by chignesh10)
    I don't even finish them :P
    For copper and HNO3 reaction

    copper is oxidised and Nitrogen is reduced

    the half equation for copper

    is it

    Cu(s) ---> Cu2+ + 2e-


    e- + NO3- + 2H+ ---> NO2 + H20 ?
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    (Original post by otrivine)
    what is a use of the trans-platin?
    you mean cis-platin? Anti-cancer drug?
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    (Original post by otrivine)
    For copper and HNO3 reaction

    copper is oxidised and Nitrogen is reduced

    the half equation for copper

    is it

    Cu(s) ---> Cu2+ + 2e-


    e- + NO3- + 2H+ ---> NO2 + H20 ?
    yeah
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    (Original post by Pride)
    you mean cis-platin? Anti-cancer drug?
    No trans-platin ? is trans the harmful isomer of cis-platin /
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    (Original post by chignesh10)
    yeah
    thanks

    how are you feeling about this exam on Wednesday
 
 
 
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