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Edexcel A2 Chemistry 6ch04/05 JUNE 2015 watch

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    (Original post by Wahid1)
    I put hexane


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    Nah definitely was the cyclohexanol because of the OH - makes it polar - interacts with microwaves


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    (Original post by hsheahan)
    The first question was Z-2-chloro-pent-2-ene or something like that, and I got O2 as the gas which wasn't suitable, -12 is right
    Why did you choose O2? It's an inert gas so I thought it was CO2 cos its more polar... :/

    (Original post by AnishaJayne)
    Was it separating funnel? And drying agent etc I spoke to my teacher and he said this would be the best from what I could remember the question being


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    I put separating funnel but tbh I don't think we'll have any idea of the answer unless the scientists in Pennsylvania tell us or Edexcel release the markscheme :')
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    (Original post by MoHoosen9167)
    I've literally got George Facer open right now and it says:

    "The carrier gas can be Hydrogen, Argon, Oxygen, Nitrogen or Air,"

    Therefore, CO2 is unsuitable, as CO2 would be present in Air just not a lot of it. Whereas pure Oxygen is allowed.
    Mine says the opposite.
    And for constant calculation i got 0.56
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    (Original post by MoHoosen9167)
    I've literally got George Facer open right now and it says:

    "The carrier gas can be Hydrogen, Argon, Oxygen, Nitrogen or Air,"

    Therefore, CO2 is unsuitable, as CO2 would be present in Air just not a lot of it. Whereas pure Oxygen is allowed.
    George facer textbook or revision guide ? I put same as you and said Carbon dioxide inappropriate



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    (Original post by cerlohee)
    I put cyclohexanol and it was microwaves, cos polar
    Also got 4 before the 0.56 question
    Also I got 12.0 for the pH?
    + What were your three points for the pH>7 question
    I was like: ∆H is +ve, therefore an increase in temperature would shift the equilibrium to the right, making the value for Kw larger. pKw would decrease as it is a negative log, so the pH would decrease too. Therefore, he is incorrect.
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    (Original post by Wahid1)
    I put hexane


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    Same...the answer was hexanol though I think
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    (Original post by rasil23)
    Mine says the opposite.
    And for constant calculation i got 0.56
    Yeah 0.56 and the first part was 4.


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    (Original post by neverstop)
    George facer textbook or revision guide ? I put same as you and said Carbon dioxide inappropriate



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    Textbook
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    (Original post by cerlohee)
    I put cyclohexanol and it was microwaves, cos polar
    Also got 4 before the 0.56 question
    Also I got 12.0 for the pH?
    + What were your three points for the pH>7 question
    Ahh, well. Cyclohexane was a guess so not surprised that was wrong. Did you round your values throughout the pH question? I didn't, so maybe mine was lower :/ A lot of people got 12.0 though.
    For the three points, I put:
    - titrating weak acid with strong base
    - strong base ionises fully whereas weak acid doesn't
    - hence more OH- ions in solution so slightly higher pH than 7.
    No idea if this is right though :/
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    Alright Multiple Choice questions

    -2601
    -12 ( I can't remember )
    4
    0.56
    KOH
    Z2chloro
    Cyclohexanol
    2 methylcyclohexane
    Oxygen ( Cofirmed is correct )


    pH
    12.0
    Ph does change of water

    Rate=k(A)(X)
    k=0.21
    tonnes=3.1
    The biodiesal catalyst anything OH


    Section C:
    delta H -311
    System= -567


    nmr thing:
    triplet, quartet,
    1.8-3.0
    10.0-12.0
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    (Original post by neverstop)
    Yeah 0.56 and the first part was 4.


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    Hahah I spent ages on it then I realised that they'd told us the MF! First I tried doing it with 1 mol NO2 and 0 mol N2O4 initially, and then I wound up with an answer that wasn't there! I must have spent about three minutes on that question then kicked myself when I got it ahaha
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    (Original post by MoHoosen9167)
    I've literally got George Facer open right now and it says:

    "The carrier gas can be Hydrogen, Argon, Oxygen, Nitrogen or Air,"

    Therefore, CO2 is unsuitable, as CO2 would be present in Air just not a lot of it. Whereas pure Oxygen is allowed.
    Lol in my book it says CO2 is suitable?

    suitable gases are: " nitrogen, helium, argon, CO2 " in the Ann Fullick book
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    (Original post by frozo123)
    Lol in my book it says CO2 is suitable?

    suitable gases are: " nitrogen, helium, argon, CO2 " in the Ann Fullick book
    Ann Fullick is renown for her mistakes, check the lack of a negative sign on the Arrhenius equation plus Boron Trifluoride having Gallium as the central atom (in AS).
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    (Original post by HappyCheesecake)
    Ahh, well. Cyclohexane was a guess so not surprised that was wrong. Did you round your values throughout the pH question? I didn't, so maybe mine was lower :/ A lot of people got 12.0 though.
    For the three points, I put:
    - titrating weak acid with strong base
    - strong base ionises fully whereas weak acid doesn't
    - hence more OH- ions in solution so slightly higher pH than 7.
    No idea if this is right though :/
    That's EXACTLY what I wrote haha


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    Lol wtf is the answer to the suitable gas . Knowing edexcel , the most right answer will be a gas that isn't even on the bloody question paper !


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    (Original post by MoHoosen9167)
    I've literally got George Facer open right now and it says:

    "The carrier gas can be Hydrogen, Argon, Oxygen, Nitrogen or Air,"

    Therefore, CO2 is unsuitable, as CO2 would be present in Air just not a lot of it. Whereas pure Oxygen is allowed.
    OMG YAY +1 MARK

    I swear you keep making my day better since before the exam lol
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    (Original post by MoHoosen9167)
    Ann Fullick is renown for her mistakes, check the lack of a negative sign on the Arrhenius equation plus Boron Trifluoride having Gallium as the central atom (in AS).
    Oxygen sounds more plausible though because things can get oxidised in oxygen?
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    (Original post by Wahid1)
    That's EXACTLY what I wrote haha


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    Me too
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    (Original post by neverstop)
    Which one increased the equilibrium yield of CN? I swear they were trying to catch us trying to make us pic KCN because that's what we learn but I actually chose KOH because of the way OH reacting with H and therefore equilibrium moves to right ? Or maybe the answer is KCN?


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    KOH cos it reacts with the H+, so position moves to rhs
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    (Original post by Nautic4l)
    OMG YAY +1 MARK

    I swear you keep making my day better since before the exam lol
    Hahah I really hope I'm helping someone, because I can't see myself losing any less than 20 marks in this paper.
 
 
 
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