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    For the I2 solubility question, I talked about permanent dipole-dipole forces not H bonds, do you think both are acceptable? Just googled this actually and apparently H bonds are technically a subset of permanent dipole-dipole forces
    Just hope OCR see it that way lol
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    As somebody who likes maths and isn't actually that great at chemistry, didn't enjoy that paper very much. Was a distinct lack of maths, 2 questions on complex ions which is my worst topic and only about 4 marks for entropy which is my favourite topic. Overall still think I did fairly well, answered every question, didn't enjoy it as much as most of the past papers though.

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    (Original post by NervousBoy)
    Step 1: H2O2 + I- ---> HI + HO2-Step2: Forgot?
    Step 3: Given
    Step 4: H+ + OH- ---> H2O

    Anyone got anything along these lines?

    I'm sure the mark scheme accepts other versions too
    HIO + OH- for step 1, instead of what you got.
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    (Original post by katiemckkk)
    was the water at 60c alkaline/acidic??
    I put alkali. Because i worked out neutral ph as 6.5 so 7 is greater than 6.5 therefor alkali.
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    (Original post by Vannzzoo)
    Tbh I was expecting something way more challenging, especially the titration type calculations, I think the calculation to find X was only 5 marks, I thought they would include one which was worth more marks
    Idk I think it was better to have fewer marks on the titration question so there could be more questions overall? I ended up getting X= 5.33 but I'm hoping I'll get the method marks because I wrote out each step. I'm just annoyed about the AS stuff because I didn't retake F321

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    (Original post by fghj1)
    Nope pale yellow to clear
    Was this Q 1 or 2 marks for both parts?
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    (Original post by BioStudentx)
    You're right and he's wrong. Didn't even add acid, it was adding salt.

    -log(Ka/1.25) would have gave you the right answer.
    god bless u sir
    I used Henderson-Hasselbach tho x
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    Can anyone explain how x=4 for the last question if you remember your working out.
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    (Original post by HFancy1997)
    Everything correct except for the first number, it said 2 sf so 0.029

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    Cool!
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    im dead I start to think I lack talent to get good grades in chemistry
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    (Original post by saira123x)
    Why was H+ not a catalyst!? I said it doesn't speed up the rate of reaction and is not reformed ?
    Wasn't sure I put about non-standard conditions looool
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    (Original post by BioStudentx)
    It was bae.

    Finished with 30 mins to spare, and yes I got 4H2O. Grade boundaries will be disgustingly high though. Similar to last year, maybe 1 higher.
    you are literally so annoying, me and 3 others from my college that are going to oxbridge said that it was definitely harder than last years and a lot of people found it hard. don't be so patronising to the other people you snob
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    (Original post by BioStudentx)
    Acidic. Position of eqbm shifts to right at higher temperature, as it's endothermic.

    The "actual pH" was 6.03
    It asked whether a ph of 7 is acidic/alkaline at 60 degrees, so using the new Kw, you get that the concentration of oh- is larger than the conc of H+ so it is alkaline
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    (Original post by biostudentx)
    hio + oh- for step 1, instead of what you got.
    h2o2 + i- > hoi + oh-
    hoi + i- > i2 + oh-
    given
    2oh- + 2h+ > 2h2o
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    Everything correct except for the first number, it said 2 sf so 0.029 it also said standard from so 2.9x10-2 I'm afraid probs -1 mark tho so not too much to worry about, didn't spot that one till second time round
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    (Original post by BioStudentx)
    pH of the buffer was 3. something. Anyone who wrote anything else got it wrong.
    (Original post by EricPiphany)
    Some answers I scribbled down:

    0.0285
    104.2
    2.12
    3.43
    10.76
    4

    Hopefully I did well enough for an A overall. Chemistry is now over. Hell yeah!
    Yes bois

    I think I lost a mark on the first one for wrong s.f :/

    And the buffer one, you were simply adding x moles NO2-...
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    (Original post by BioStudentx)
    Acidic. Position of eqbm shifts to right at higher temperature, as it's endothermic.

    The "actual pH" was 6.03
    im sure it was Alkaline...Or did I make a *****y error-.-

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    (Original post by sophiewei)
    I put alkali. Because i worked out neutral ph as 6.5 so 7 is greater than 6.5 therefor alkali.
    i did it by finding out the concentration of (h+) and the concentration of (oh-) and since the concentration of (oh-) was most than (h+), this shows that it was in fact alkaline, but few others did it your way too so i assume your method might be correct
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    (Original post by tomlam)
    Anyone think that exam was bae?

    (oh, except that question at the bottom of the second to last page)

    Anyone get 4H2O for the last Question?
    Anyone finish with 45 minutes to spare?
    Im sure when i say this. I speak on the behalf of majority of students that this exam was not "bae" .. but paper was adequate.
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    (Original post by HFancy1997)
    Everything correct except for the first number, it said 2 sf so 0.029

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    Didn't it also say in standard form? I put 2.9 X 10^-2
 
 
 
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