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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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    (Original post by Kits)
    What's the average for an A in chem? 75 odd?
    I would say around that on average.
    This year?
    I reckon it will stay put t around 77-79 again...
    Much harsher than Biology and totally vile compared to Physics for those that studied it...



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    (Original post by CurtisDean)
    Guys how embarrassing! I spelt 'breathalyser' as 'breatherlyser' loool :-S


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    Not as bad as me, I spelt it as 'breathylyser'
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    (Original post by Konshi)
    What was the 2 mark Hess cycle answer?
    ‒4596 or ‒4956 something like that.
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    For 3 d ii
    I said I is the cis isomer and J is the trans, will i get a mark?

    For 4 b i
    I wrote 'Heat' it was a guess, is that right?
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    AHHHHHHHH I FORGOT ABOUT THE BREATHALYSER :mad:

    How many marks was that question ????
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    F322 QP (2013)


    Here I merged the photocopy and put it on a faster website to make life easier.
    Thanks for the paper.

    EDIT:
    These are new links for people that are having trouble:

    1.) Google Docs:
    https://docs.google.com/file/d/0Bwx_...Rzg/edit?pli=1

    2.) Dropbox:
    https://www.dropbox.com/s/ttht4j0glu...02013_F322.pdf
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    (Original post by jacksonmeg)
    for the one about formation of ozone, what were the two equations?
    I did O3 + O -> 2O2 and
    O2 + O -> O3
    is that right ?
    I am going to have to say that those equations - that could be expressed as one - was suppose to be included with the question ABOVE that one..

    That is showing the overall equation for this reaction breakdown.
    The ones below are showing the radical substitution!

    THESE ARE THEM:
    NO. + O3 goes to NO2. + O2
    Then...
    NO2. + O goes to NO. + O2.



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    (Original post by jacksonmeg)
    for the one about formation of ozone, what were the two equations?
    I did O3 + O -> 2O2 and
    O2 + O -> O3
    is that right ?
    I put the second one with reversible arrow. Isn't the first eqn breaking down of ozone. They asked how is it maintained? I gave the second eqn and said the reaction continues and while at this, absorbs UV and releases as heat with no net loss of ozone.
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    (Original post by Room4student)
    For 3 d ii
    I said I is the cis isomer and J is the trans, will i get a mark?
    You're right, and I think you will get the mark.

    For 4 b i
    I wrote 'Heat' it was a guess, is that right?
    I don't think that would be acceptable. UV light is essential to start a radical reaction.
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    I Hope the paper I uploaded Helps everyone in discovering an ESTIMATE of their mark, sorry for the delay.


    ~ The A* Guy ~
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    (Original post by Ché.)
    I am going to have to say that those equations - that could be expressed as one - was suppose to be included with the question ABOVE that one..

    That is showing the overall equation for this reaction breakdown.
    The ones below are showing the radical substitution!

    THESE ARE THEM:
    NO. + O3 goes to NO2. + O2
    Then...
    NO2. + O goes to NO. + O2.



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    thats what i did for the question above, but whats the answer for the ozone maintenance one ?
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    (Original post by Room4student)
    For 3 d ii
    I said I is the cis isomer and J is the trans, will i get a mark?

    For 4 b i
    I wrote 'Heat' it was a guess, is that right?
    It's e/z not cis/trans bro.

    I put uv light, but heat will almost certainly be allowed.
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    What is the UMS you need for an A* overall?
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    (Original post by freetown)
    F322 QP (2013)


    Here I merged the photocopy and put it on a faster website to make life easier.
    Thanks for the paper.
    Please teach me how to merge different pdf files in one? I have been wanting to know this all my life?????
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    (Original post by walkers38)
    I put the second one with reversible arrow. Isn't the first eqn breaking down of ozone. They asked how is it maintained? I gave the second eqn and said the reaction continues and while at this, absorbs UV and releases as heat with no net loss of ozone.
    if you just show the making of ozone that isnt maintaining, its increasing, right ?
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    (Original post by Room4student)
    For 3 d ii
    I said I is the cis isomer and J is the trans, will i get a mark?
    Yeah I put I is a Z-isomer and J is a an E-isomer
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    for the ozone depletion i used the equation and i explained it, would i get 2 marks for that?
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    (Original post by the A* guy)
    I Hope the paper I uploaded Helps everyone in discovering an ESTIMATE of their mark, sorry for the delay.


    ~ The A* Guy ~
    Thanks!

    Sorry for thinking you were lying
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    Guys if I did the propagation steps differently-
    Like reacted Ch4 with Br• and showed that
    Then Ch4 with I• and still got the required products- will that be ok?
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    Did anyone else get -4534 for the formation?
 
 
 
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