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OCR Chemistry F322~ 4th June 2013~ AS Chemistry Watch

  • View Poll Results: How did you find the exam
    Hard A= 72
    42
    15.22%
    It was okay A= 76
    99
    35.87%
    Easy A= 79
    75
    27.17%
    Very Easy A=82
    60
    21.74%

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    Thanks everyone! I'm just having fun cramming these conditions and equations.. fml

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    Someone help me with this question please! Thanks and much appreciated, in advance!
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    Maybe I'm just being stupid but I don't understand the answer to 4 e) ii) on the may 2012 paper. Could anyone explain it to me please? anyone?
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    (Original post by Blashnet)
    what're the conditions?
    400 Degrees Celsius, 200 Atmospheres, and an Iron Catalyst
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    Guys for oxidising agent [O], is it

    H2SO4/K2CrO7
    Or
    CrO7 2-/H+

    /

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    (Original post by nivvy21)
    Someone help me with this question please! Thanks and much appreciated, in advance!
    I would've done your calculation :confused:
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    you know when you find out empirical formula, they give you percentage composition- so you do that divided by the mr and you get moles for each element- do you have to then divide by the smallest mole number? Cause in the book you do- but in the mark scheme for the infrared questions you don't O_O
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    (Original post by wndms)
    Guys for oxidising agent [O], is it

    H2SO4/K2CrO7
    Or
    CrO7 2-/H+

    /

    Posted from TSR Mobile
    I believe you can use either, but personally acidified potassium dichromate is easier to remember

    EDIT: Essentially they're the same thing. The acidified part being the proton H+, replacing the metal ion and leaving a dichromate ion
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    How do you use mass spectrometry to 'determine relative isotopic masses'?
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    (Original post by wndms)
    What are the conditions of alcohol to ketone plz anyone

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    -heating
    -secondary alcohol
    -acidified potassium dichromate
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    (Original post by Jess96)
    How do you use mass spectrometry to 'determine relative isotopic masses'?
    The peaks will be at each isotope. You kook at the height of the peaks which tells you the abundance of each isotope, then you can do a calculation from there

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    that feeling when you've done so much revision but you feel like your brain is completely empty......just before the exam....
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    (Original post by Zebrajess)
    The peaks will be at each isotope. You kook at the height of the peaks which tells you the abundance of each isotope, then you can do a calculation from there

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    thanks! simpler than I realised, ha
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    Good luck to everyone! Hope you all get the grades you want
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    (Original post by cookiess)
    you know when you find out empirical formula, they give you percentage composition- so you do that divided by the mr and you get moles for each element- do you have to then divide by the smallest mole number? Cause in the book you do- but in the mark scheme for the infrared questions you don't O_O
    Ahhh I saw that! But in the markscheme on the side it shows mol calculations as well . I believe you get the same answer either way, so as long as you show your working out it should be fine
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    can anyone link me the the jan 2013 paper please it would be very helpful !
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    (Original post by Joey952)
    can somebody help on question 4 http://www.thestudentroom.co.uk/atta...hmentid=214241
    bump
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    Anyways guys! Thanks for all your help! hope I was of some help too! GOOD LUCK!
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    (Original post by Bambrianne)
    can anyone link me the the jan 2013 paper please it would be very helpful !
    first post
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    (Original post by CRW1996)
    Maybe I'm just being stupid but I don't understand the answer to 4 e) ii) on the may 2012 paper. Could anyone explain it to me please? anyone?
    It's really frustrating me, can someone plz give my a quick explanation?
 
 
 
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