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    The aluminium ionic equation should be

    6H+ + 2Al -----> 2Al3++3H2

    Also, for the tin and iodine compound reaction - do you think they'll allow the addition of OH- to the right hand side instead of water?

    So

    6H+ + 5Sn2++2IO3- -------> 5Sn4+ + I2 + 6OH-
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    (Original post by otrivine)
    Will I get the mark

    for saying, h2o was not present in rate equation ?

    In mark scheme they put TdetaS< DETA G

    I put detaG> TdetaS ? is that fine
    Yes, that's fine! And that depends on the question...?
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    (Original post by DudeBoy)
    But It was CH3 CH3 not O O
    It was (COO-)2


    (Original post by Jed_)
    Good news then! were we given a molar mass? I must have overlooked that entirely.
    Yeh, it was 211.8 I think.
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    Did anyone get FeCl3 in one of the equations? I would be more specific but my memory is awful!
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    (Original post by JimmyA*)
    The equation for the reaction when zinc powder was added was also 2 marks not 1.
    Okay good! Then I think we have all marks accounted for when we get the figure for gibbs!
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    (Original post by PythianLegume)
    For the delta G, I believe it was 2879 + 298x0.256 = 2955. It was worth at least 2 marks.
    I too got this number
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    (Original post by Kat12395)
    Yes, that's fine! And that depends on the question...?
    which question?
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    (Original post by Kat12395)
    WE HAVE FINISHED THE MARK SCHEME (Finally!)
    https://docs.google.com/document/d/1...it?usp=sharing
    YOU'RE WELCOME!
    2/5 marks missing is the
    Ni
    Ni2+

    Electron configuration

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    (Original post by Benjy100)
    The aluminium ionic equation should be

    6H+ + 2Al -----> 2Al3++3H2

    Also, for the tin and iodine compound reaction - do you think they'll allow the addition of OH- to the right hand side instead of water?

    So

    6H+ + 5Sn2++2IO3- -------> 5Sn4+ + I2 + 6OH-
    wait sorry! just realised that there is even charge so sure! yes you would get the marks
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    i just wanted to ask on buffer of ph did anyone use this method...??

    of working out both the individuals moles and taking away from each other.converting ka to pka

    e.g:
    3 c(ii)
    http://www.ocr.org.uk/Images/135166-...ments-june.pdf
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    (Original post by keepontrying)
    I too got this number
    Is delta G not Delta H - TDS? (Not add?)
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    (Original post by scorpio22)
    i just wanted to ask on buffer of ph did anyone use this method...??

    of working out both the individuals moles and taking away from each other.converting ka to pka

    e.g:
    3 c(ii)
    http://www.ocr.org.uk/Images/135166-...ments-june.pdf
    If it's the henderson model, and you got the same PH- you'll get the marks, np.
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    (Original post by Kat12395)
    Is delta G not Delta H - TDS? (Not add?)
    dS was negative, so -TdS was positive; that was the point of why it is never feasible.
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    (Original post by PythianLegume)
    dS was negative, so -TdS was positive; that was the point of why it is never feasible.
    But it was --! ;D
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    (Original post by Kat12395)
    Is delta G not Delta H - TDS? (Not add?)
    I don't understand your question, perhaps if you rephrase please?
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    (Original post by keepontrying)
    I don't understand your question, perhaps if you rephrase please?
    Dw, I was just confused because the before person wrote it as plus; but that's only because I always think of it as minus minus!
    (Check delta G on the Mark Scheme!)
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    (Original post by master y)
    that one was ok, i got 5.1 x 10^16. you knew G was that energy, then divide by delta H to give moles. Then times 44 to get the mass (n = m/mr)
    thats what I did and got the same answer as you
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    (Original post by Kat12395)
    Dw, I was just confused because the before person wrote it as plus; but that's only because I always think of it as minus minus!
    (Check delta G on the Mark Scheme!)
    sure ,i totally understand
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    can someone show a breakdown of the mark of the 7 mark at the end thanks
    • Study Helper
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    (Original post by Kat12395)
    Dw, I was just confused because the before person wrote it as plus; but that's only because I always think of it as minus minus!
    (Check delta G on the Mark Scheme!)
    From this mark scheme it is only 15 marks I'll lose, but should get 5 for special consideration so I think I've actually hit the 90's for this one!!!! I'm ecstatic and ready to ace C3 tomorrow
 
 
 
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