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    (Original post by Pippy12345)
    What did everyone get for the characteristics of chromium chemistry question?
    Formation of complex ions
    Coloured ions
    Variable oxidation states
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    (Original post by idk97)
    Why is the purity 94 and not 50.7???/
    I too got 50.7 but apparently its wrong
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    (Original post by Hopefulmedic15)
    I sat last years paper and this year's and I think they're about the same in difficulty although the calculation on this year's may have tripped up more people so I think the grade boundaries will be about the same if not one ums less for each grade boundary compared to last year
    I think after chem 4 a lot of people have just found this paper a lot easier in comparison. But I agree. It wasn't an extremely easy paper, but not insanely difficult.


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    (Original post by randoms132)
    No it didnt :-)


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    Ok phew!
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    (Original post by randoms132)
    Straight horizontal line?


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    crap i put it would increase first then stay constant
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    (Original post by ravichauhan11)
    same question came up in 2014, mark scheme : " Allow same number and type of bonds broken andformed"
    But that was from a reactant of [Co(NH3)6]2+



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    Damn lost two marks on the alkaline fuel cell question, couldn't work it out in time.

    Also got 35.2% for the % purity question but that's % by mass so think i lost like 4 marks from both of those^^

    i said increase in pressure increases emf because when more oh- formed/reaction speeds up not sure if that's right tho :/

    For the last 3 marks what did people say? I talked about mixing two solutions indifferent proportions one containing ligand and one containing mn04- then shine light through a filter at the solution and use data logger to measure absorbance then find ratio at max absorbance.
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    (Original post by sk123456)
    I too got 50.7 but apparently its wrong
    I also got 50.7 and so did quite a few others at my school
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    (Original post by SirRaza97)
    That was the nicest paper in the god damn world. Apart from the 7 marker calculation question it was so easy. Definite A*
    what do you think grade boundaries will be?????
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    (Original post by randoms132)
    No - the starting reactant was [Co(H2O)6]2+ and the product was [Co(h2nch2ch2nh2)3]2+ not same type of bonds are broken as are formed but same number yes


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    You're breaking water bonds and then reforming them
    You're breaking ethane-1,2-diamine bonds and then reforming them
    Plus this came up before

    (Original post by Pippy12345)
    What did everyone get for the characteristics of chromium chemistry question?
    Variable oxidation state
    Form coloured ions
    Catalytic activity

    (Original post by Matt Johnson)
    I had Mn2+ and H2SO4
    Let's hope it's right!

    (Original post by Pippy12345)
    Did it ask for examples?
    Nope.
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    (Original post by RME11)
    +ve was O2 + 2 H20 + 4e -> 4OH-

    The conditions were in alkaline so you can't have H+ ions in your equation.
    Ohh that makes sense...
    do you remember how many marks that was?
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    (Original post by randoms132)
    Could you also get a mark for saying the collision frequency is very very low ?


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    i guess because that makes sense
    • Welcome Squad
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    Welcome Squad
    Should I do an unofficial or is there already done unofficial ms or anyone started doing one
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    (Original post by ManOfJustTin)
    Did anyone else pick sulphur for X?
    I'm such an idiot 😂😂😭

    Still such an easy paper I'm so happy
    Probably my worst error on the paper. That was what, 3 marks?
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    (Original post by 12284)
    Isn't the positive and negative electrodes the wrong way around?
    The example I gave may be the wrong way around yup!
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    (Original post by DDan123)
    I think after chem 4 a lot of people have just found this paper a lot easier in comparison. But I agree. It wasn't an extremely easy paper, but not insanely difficult.


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    Yeah I didn't resit chem 4 this year so I don't have that to compare to, and it's a bit inaccurate to compare chem 5 to chem 4 grade boundaries because they're completely different papers.
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    (Original post by ravichauhan11)
    everyone remember to include that deltaH was approx 0 because same amount and type of bonds being broken and formed? for the thermo stability Q
    what thermo stability question?
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    For increase O2 pressure I put decrease EMF?

    because Ecell=Ered-Eox

    Reduction EQM would shift to left to oppose change, decreasing Ered, therefore decreasing Ecell?
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    (Original post by 12284)
    Ohh that makes sense...
    do you remember how many marks that was?
    1 mark for each half equation
    1 mark for overall equation
    = 3

    (Original post by no-1)
    Probably my worst error on the paper. That was what, 3 marks?
    Yup.
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    (Original post by no-1)
    Probably my worst error on the paper. That was what, 3 marks?
    Yep. I'm pretty sure the rest of it was fairly good unless I slipped up somewhere and haven't realised.
 
 
 
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