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    Much harder than January, that question were we had an unknown substance for each letter of the friggin alphabet -_-
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    (Original post by keepontrying)
    would you kindly direct me to the unofficial mark scheme please

    (Original post by hussaincute)
    can somebody send me a link for unofficial mark scheme with marks otherwise i'll start cryin
    I don't have the link. Check through the thread for who to ask, or for answers to most of the questions.
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    (Original post by PythianLegume)
    If you're lucky, the marker won't notice and will give you 7/7 for the correct answer.
    Hopefully, i worked out the RFM of the molecules but predicted it was NiSO4.xH2O before working out the value of x , so its not in correct order
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    Would appreciate a copy of the unofficial ms also, for f322 someone managed to get the paper aswell?
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    (Original post by PythianLegume)
    I'm fairly sure.
    When you have KJmol-1 for units of enthalpy change. Think about how you work it out. The moles that you divide are the moles of the reactant not the moles of the product. I think the standard moles for that question was the 6 that was with the CO2. I think if you wanted to work out Glucose, you'd have to divide it by 6.

    Plus it was only 2 marks.
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    (Original post by emah123)
    what did people get for the order? i got first order because the half life was constant?
    I got first order because the half-life was relatively constant (mine varied by 2s). I then annotated the graph.
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    (Original post by PythianLegume)
    I don't have the link. Check through the thread for who to ask, or for answers to most of the questions.
    I cant find all the answers n i need everything in order so plz if anybody find a markscheme plz send it to me ..... ahhhhh this headache is killing me ....i m really stressed abt my exam i wont be able to go uni if I dont get a f....g B in chemistry....
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    For the god-awful Chlorate/Chlorine question I put that acidified chlorate ions are a better reducing agent than chloride ions because of the electrode potentials, so chlorate ions and chloride ions would form chlorine gas under acidic conditions. Then for alkaline conditions, I put that the redox equilibrium for the chlorate ion system would shift to the left to produce H+ ions to neutralise the alkali (like a buffer), so the other equilibrium would shift to the right and chlorine gas would then form chlorate ions and chloride ones. I put in some equations for the fun of it.

    Anybody do anything similar?
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    any one else going queen mary?
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    for the buffer question did the volumes of the reactants matter or was it only the concentrations ?
    ...
    it scared me
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    (Original post by hussaincute)
    I cant find all the answers n i need everything in order so plz if anybody find a markscheme plz send it to me ..... ahhhhh this headache is killing me ....i m really stressed abt my exam i wont be able to go uni if I dont get a f....g B in chemistry....
    No point worrying now, you can't change anything.


    (Original post by DavidH20)
    For the god-awful Chlorate/Chlorine question I put that acidified chlorate ions are a better reducing agent than chloride ions because of the electrode potentials, so chlorate ions and chloride ions would form chlorine gas under acidic conditions. Then for alkaline conditions, I put that the redox equilibrium for the chlorate ion system would shift to the left to produce H+ ions to neutralise the alkali (like a buffer), so the other equilibrium would shift to the right and chlorine gas would then form chlorate ions and chloride ones. I put in some equations for the fun of it.

    Anybody do anything similar?
    I did something vaguely similar. I wrote out the full, balance equation from the two half-equations and said it would work like an equilibrium.
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    (Original post by PythianLegume)
    I didn't have trouble with the paper, but I do think it was harder than usual.

    I wrote the element in.
    You sir are a complete tool
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    (Original post by mogg)
    for the buffer question did the volumes of the reactants matter or was it only the concentrations ?
    ...
    it scared me
    I think the volumes added up to 1dm3 anyway, didnt they?
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    (Original post by Sweatynerd)
    You sir are a complete tool
    Why, because I was confident on the paper? Someone has to do well.
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    was the equation

    Fe + 3/2cl2 -- > FeCL3


    was it FeO4 2-
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    (Original post by otrivine)
    was the equation

    Fe + 3/2cl2 -- > FeCL3


    was it FeO4 2-
    Yes, I got these, although I doubled everything on the first equation to get whole numbers (either will be correct).
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    does any one have pictures of the actual paper?
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    (Original post by PythianLegume)
    Yes, I got these, although I doubled everything on the first equation to get whole numbers (either will be correct).
    for the optical isomers will they allow ECF?


    Cause I did Fe in the middle with 2 C2o4 2- and 2 h2o


    cause I was thinking in order for optical to occur there either has to be 3 bidentate, or 2 mono or 2 bidentate,


    cause it put in bracket (C2O4)2
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    Can someone please explain how they got their answers for the rate of reaction after 40 seconds and the rate constant? Thanks
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    where you had to name the processes it was precipitation, redox, ligand substitution in that order right?
 
 
 
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