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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 Pataiiii)
    What did everyone get for the functional groups of the biodiesel molecule, ester and an alkene?
    Yeaaaaaaah!
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    (Original post by Blashnet)
    Is there a limit on what the grade boundary could be? Like, max for an A?
    Not really, but it won't be higher than 85 I reckon. For this paper I expect it to be about 80. Could be slightly more slightly less depending on how people did.
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    (Original post by Pataiiii)
    What did everyone get for the functional groups of the biodiesel molecule, ester and an alkene?
    Oh no.. I put carboxyl and carbonyl...

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    (Original post by Cheese man)
    As soon as I came out of the exam someone told me it was heterolytic fission as the I and Br have different electro negativities... I was sure it was homolytic as it was on about radical substitution... Dno
    I put heterolytic...not sure if its right though.
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    Wonder how many pages this thread will hit. This time I will be the first post on the 200th page.
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    (Original post by pataiiii)
    i don't think you could because no hbr would be able to form.
    you're wrong.
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    (Original post by Pataiiii)
    What did everyone get for the functional groups of the biodiesel molecule, ester and an alkene?
    yup that's what i got
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    Now to revise for Physics and Psychology (
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    Aldehyde and ketone for the IR?
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    (Original post by the A* guy)
    I am not joking

    How many minutes until it goes up?
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    (Original post by TheFootyKing19)
    Questions for define Enthalpy change of combustion:

    - Enthalpy change when 1 mole of a substance
    - Burns completely in oxygen

    ^ the above is the marking points. You didn't need to say 'under STANDARD conditions' because it didn't say standard. If you did mention it then examiners would just ignore it
    I didnt say in oxygen but all the rest
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    (Original post by joe1545)
    I dont think so, thats more the biochemistry, ie colour changes, as if you were to do a IR spec on a urine or blood sample alot of bonds would appear.
    Breathilisers is especially one used by the OCR spec in the book
    Urk, if I spelled breathalysers wrong will I get the mark?:L


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    Hold on chemistss

    it had to be butanal as the molecular formula would not be appropriate for butaone.

    Try drawing butaone
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    (Original post by wndms)
    In the question, they asked for one termination step in a bullet point. So I think that should worth a mark

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    Yeah!

    Marking points will be:

    - Radical Substitution
    - Homolytic Fission
    - names of 2 steps = initiation and propagation
    - termination step equation (any)

    That's 4 marks:
    And other 3 marks will be for the 3 equations
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    (Original post by wndms)
    Exactly what I got! I got confused so I wrote a mechanism for HBr which was easier, then replaced H with I...

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    isnt the Br or I supposed to act as a catalyst and be regenerated? so how would you start with an element I or br and then regenerate a different molecule likr ibr as the catalyst
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    (Original post by TheFootyKing19)
    Questions for define Enthalpy change of combustion:

    - Enthalpy change when 1 mole of a substance
    - Burns completely in oxygen

    ^ the above is the marking points. You didn't need to say 'under STANDARD conditions' because it didn't say standard. If you did mention it then examiners would just ignore it
    hey do you know what the molecular formula of alcohol g was?
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    (Original post by LH78)
    I put heterolytic...not sure if its right though.
    the mechanism was free radical substitution which involves homolytic fission rather than heterolytic fission.
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    The fission for the IBr question HAS to be homolytic because it is radical substitution.
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    (Original post by Hawthorns)
    How many minutes until it goes up?
    i am trying to upload the first 5 pages now, But it is taking AGES.
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    (Original post by the A* guy)
    I am not joking
    Then please do, will be much appreciated
 
 
 
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