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    For the ligand substidution thing, i thought it involved zn?? not al...
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    did anyone else not even attempt the last 7 mark q?
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    (Original post by MathsNerd1)
    It was tolerable is what I would say, but definitely more maths and buffer based really
    a.k.a poison to moi.

    No, but I'm sure I'd have liked it a bit more if I liked/understood Maths. On the plus side, they did manage to give us two definitions.
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    (Original post by Benjy100)
    I drew the iron with three of those bidentate ligands around it. I think you could also have taken two of the bidentate ligands and left two waters on there. Not sure really.
    2 bidentates and two waters would be incorrect, because it said mixture of two, not 3, optical isomers.
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    (Original post by Sarangtaec)
    I put the O-
    Damn, I did the =O. I thought this paper went well, but now I think that maybe I flunked it...
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    I kind of raced through one of the questions because I thought what it was asking was ridiculously easy - so perhaps I got it wrong.

    IO3- was the oxidising agent right because Sn was oxidised from +2 to +4?
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    (Original post by Benjy100)
    I drew the iron with three of those bidentate ligands around it. I think you could also have taken two of the bidentate ligands and left two waters on there. Not sure really.
    I did the same! , did you draw the whole ligand out I did... think you was meant to but not sure? and did u get 3- charge?
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    Has anyone got access to the unofficial mark scheme? Or know where it is? I ask because there was an unofficial mark scheme for the Biology exam yesterday
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    (Original post by chignesh10)
    alright chapitos? that was an alright paper
    It wasn't too bad really, I made a few slip ups but that's it really. 90+ for you?
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    (Original post by PythianLegume)
    Because it's in such great excess, that any change in concentration is negligible.

    Omg I totally guessed. :') the funny thing is that if I had time to go back and check I probably would have changed it.
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    (Original post by Sarangtaec)
    Does anyone remember what the alkali we had to work pH out from was? I swear it's Ca(OH)2 and I forgot to multiply the concentration by 2 =( Unless it was NaOH then I did it right LOL
    It was NaOH.
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    For the CO2 one I divided the photosynthesis one by 6 (cause there was 6 co2) and then (X) Mr (44) cause it wanted mass so I did n (x) Mr.. I don't know whaether anyone else did same.... ??
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    (Original post by keepontrying)
    what did everyone draw for the optical isomers????
    Fe in the middle and 6 bonds with that DMsomething and charge of 3-
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    So was I not the only one completely fishing for marks in the last Q? :/
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    (Original post by Sarangtaec)
    Does anyone remember what the alkali we had to work pH out from was? I swear it's Ca(OH)2 and I forgot to multiply the concentration by 2 =( Unless it was NaOH then I did it right LOL
    pretty sure it was NaOH
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    (Original post by MathsNerd1)
    I got the same equations as you did, I'm hopefully going for 85+!!
    I don't want to disappoint, but Al forms 3+ ions.
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    I've got quite a bit right from what I've seen so far, but on the mass of CO2 question I worked out the number of moles of glucose formed by using energy/enthalpy, then multiplyed that by 6 (as I assumed it was the enthalpy of formation) and multiplyed that by (12+(2(16))) to get some crazy ass number, something to the 17 I think.
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    (Original post by PythianLegume)
    2 bidentates and two waters would be incorrect, because it said mixture of two, not 3, optical isomers.
    So they wanted the three bidentates around it with a 3- charge? If so that's what I did
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    (Original post by Alex Bampton)
    NaOH - relax!
    THANK YOU!! Omg I was panicking haha, only 2 marks but I want as much as I can get (ofc) ^-^
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    (Original post by Allotropy)
    Overall I thought the paper was hard but doable. Looking through the answers people have posted I seem to be the only one who calculated a value of 3.55 for the buffer solution pH, did anyone else get this?
    This is how you find the pH
    Charco is officially a BAMF! XD




    (Original post by PythianLegume)
    It was acting as a base.
    at this point in the exam all my basic chemistry knowledge dissappeared! lol
 
 
 
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