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    I think this paper was hard..... Hopefully the grade boundaries is similar to jan 2013
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    (Original post by Kat12395)
    This is ridiculous. I've created a new document- if you're going to take it seriously; private message me and I'll link you.
    can you send me it please!
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    (Original post by needtosucceed=))
    thats all you had to put? it was 5 marks so I thought 3 for the calculation and 2 for explaining or something
    It'll be the 2 for explanation (identifying and defining strong and weak acid) and 3 for calculation.
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    (Original post by PythianLegume)
    That's about what I got - I think it's right




    Personally, yes, I didn't find jan 2013 that hard :dontknow:
    I got 0.0425 for the rate not 0.00
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    Yup.

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    (Original post by chignesh10)
    I got 0.0425 for the rate not 0.00
    Oops, misread the person I quoted. Yeh, I got 0.045.
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    (Original post by taylor1995)
    can you send me it please!
    can u also send it to me please?
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    (Original post by _HabibaH_)
    Just putting this out there...

    Please no one take their life or do something else stupid. 'Tis not worth it. Everyone seems pretty upset, for good reason obv.
    I once purely JOKED about 'Jumping off a bridge' if I were to get a bad grade in an exam I did..on the results day for that exam my mum refused to leave me alone and I only later noticed why lol :rolleyes:
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    (Original post by PythianLegume)
    Oops, misread the person I quoted. Yeh, I got 0.045.
    Same here!! Then did you divide by 34 to get the k value?
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    The low grade boundaries and difficulty of this paper is only to be expected, after the high grade boundaries and not so difficult f324 unit that most of us sat in January..
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    can someone tell the answers for the Cl2 and ClO thanks
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    (Original post by hussaincute)
    can u also send it to me please?
    To me as well?
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    For the table with concentration changes, was it the Iodine that had its concentration increased?

    If so, I put HI to increase and hydrogen to decrease, and Iodine to have increased, in order to keep the value of Kc constant.

    If you think about it, Kc is constant, increasing Iodine increase the bottom of the fraction, so the value of the Kc expression decreases. We need to increase it again, so we need to increase the top and decrease the bottom, so HI rises, Hydrogen decreases, and Iodine decreases relative to its inital concentration (but relative to the previous experiment it has still increased).

    Anyone agree (if it was hydrogen that had its concentration increased, my answer is the same but swap hydrogen and Iodine around)?
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    (Original post by MathsNerd1)
    Same here!! Then did you divide by 34 to get the k value?
    3.4, not 34.
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    (Original post by MathsNerd1)
    Same here!! Then did you divide by 34 to get the k value?
    I done that!

    3.4 that is
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    does anyone know why there isn't a unofficial mark scheme yet?
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    (Original post by fayled)
    For the table with concentration changes, was it the Iodine that had its concentration increased?

    If so, I put HI to increase and hydrogen to decrease, and Iodine to have increased, in order to keep the value of Kc constant.

    If you think about it, Kc is constant, increasing Iodine increase the bottom of the fraction, so the value of the Kc expression decreases. We need to increase it again, so we need to increase the top and decrease the bottom, so HI rises, Hydrogen decreases, and Iodine decreases relative to its inital concentration (but relative to the previous experiment it has still increased).

    Anyone agree (if it was hydrogen that had its concentration increased, my answer is the same but swap hydrogen and Iodine around)?
    If initial [H2] is increased, then [I2] cannot increase if [H2] decreases. It's just not possible, because the moles of each is linked.
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    (Original post by MathsNerd1)
    Same here!! Then did you divide by 34 to get the k value?
    3.4 I hope? haha
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    (Original post by kuku2013)
    does anyone know why there isn't a unofficial mark scheme yet?
    Just check through this thread from about page 175, most of the answers are up.
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    (Original post by Nuna)
    I once purely JOKED about 'Jumping off a bridge' if I were to get a bad grade in an exam I did..on the results day for that exam my mum refused to leave me alone and I only later noticed why lol :rolleyes:
    Oh my God seriously, that is so adorable of her though. Bless, your mumma cares to say the least!
 
 
 
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