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OCR A2 CHEMISTRY F324 and F325- 14th and 22nd June 2016- OFFICIAL THREAD watch

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    was was the enthalpy of hydration question?
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    The paper was quite dodgy. Not as hard as I expected though. And what's with the AS question, such as the shape the solubility of Iodine and the AgI question. Grade Boundaries will definitely be lower than last year.
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    (Original post by HJS14)
    Prediction for A*?
    Bit harder than last year, 84.
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    What did you have to do for the last question. All i did was 2.226g/16 and left it at that. Doubt that was right anyway :'(


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    (Original post by suibster)
    the shape is linear
    Phew! Had to spend about a minute digging that one up from AS memory...


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    (Original post by CaoimheMee)
    did anyone get 11.73 for ph of dilute NaOH?

    20cm^3 of 0.0270mol dm^3 NaOH diluted and made up to 100cm^3
    mole of Naoh= 5.4x10^-4
    concenctration of NaOH in 100cm^3 = 5.4x10^-3
    POH=2.267
    so pH= 11.73
    Hey were you supposed to use 100cm3 or 120cm3?
    Because if its diluted you should take the total volume of everything?
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    (Original post by bj1)
    How would you know it's yellow? I just said 'forms a precipitate'. I wrote out the relevant equations rather than saying eqb shifts 'left/right"

    Not sure why I got 4.5 at the end for X, my method and numbers beforehand seem to be the same as others, perhaps I rounded too early? Or used incorrect Mr?


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    F321 - yellow precipiate formed from Ag + I
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    (Original post by CaoimheMee)
    did anyone get 11.73 for ph of dilute NaOH?

    20cm^3 of 0.0270mol dm^3 NaOH diluted and made up to 100cm^3
    mole of Naoh= 5.4x10^-4
    concenctration of NaOH in 100cm^3 = 5.4x10^-3
    POH=2.267
    so pH= 11.73
    i got 11.72, what did u get for the ph of the buffer of HNO2 i got 2.12?
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    (Original post by CaoimheMee)
    did anyone get 11.73 for ph of dilute NaOH?

    20cm^3 of 0.0270mol dm^3 NaOH diluted and made up to 100cm^3
    mole of Naoh= 5.4x10^-4
    concenctration of NaOH in 100cm^3 = 5.4x10^-3
    POH=2.267
    so pH= 11.73
    It was at 60 degrees C not 25, you dont use 25 degrees C Kw which is 10^-14, you use the one it gave in the question as it said 60 degrees.Think the answer was 10.76

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    Anyone get 2.9x10-2 for the Kc value of the order's question because it said apportriate significant figures and standard form?
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    (Original post by LThomas694)
    At least we're not the only ones eh, yeah that's what I was thinking but I can't remember if I wrote it down or not? I feel like I didn't have time to write it down which is annoying but that was the only one I left blank so hopefully it will be alright. I think that paper was definitely harder than 2015 and probably 2014 too

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    I put the same stuff with reference to the equilibria, then I was talking about how you would see a mixture of yellow and grey-black precipitates? AgI is yellow and it says I2(s) is grey-black
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    For the last question I think I got 17
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    (Original post by mosheezie)
    Piss easy FULL UMS FOR ME! My whole college said it was easy af, you guys stop stressing!
    Grade boundaries
    A* -90
    A - 85
    Everything below mehh......
    lol don't be stupid, 85 for an A?? Lololol nah
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    (Original post by NervousBoy)
    Anyone get 2.9x10-2 for the Kc value of the order's question because it said apportriate significant figures and standard form?
    Same answer as you, it actually said 2 s.f. standard form though (doesn't matter cos you did it anyway lol) the one where it said appropriate was Kc questions I'm pretty sure
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    (Original post by k.russell)
    Slightly different method, but the same answer! Confident in that one because I did check it twice and and I've done quite a lot of those questions ( I used the value of Kw at 60'C)
    thank youuuu I know there's two ways of doing it!
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    I didn't finish....missed out Q7 and 8 completely. I feel so annoyed rn it's unbelievable 😩😓
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    (Original post by mosheezie)
    Piss easy FULL UMS FOR ME! My whole college said it was easy af, you guys stop stressing!
    Grade boundaries
    A* -90
    A - 85
    Everything below mehh......
    Yeah, agree it was quite easy but stop being obtuse!
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    (Original post by ToLiveInADream)
    F321 - yellow precipiate formed from Ag + I
    Sigh. Bet the resitters were laughing at that one and the linear one.

    It was 79 for an A last year, one of the highest it's ever been. This will certainly not be higher than that. Harder than this years F324 tbh.

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    (Original post by screwedmofo)
    i got 11.72, what did u get for the ph of the buffer of HNO2 i got 2.12?
    I got 2.12 as well. Not sure it's correct though :/
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    Why was H+ not a catalyst!? I said it doesn't speed up the rate of reaction and is not reformed ?
 
 
 
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