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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 joe1545)
    I split the question into two bits, temperature and catalyst, drew two diagrams for each, both correct, then said how a decrease in activation means more molecules now have the activation energy, and showed the increase by shading the diagram, and the same for temp so rate would increase
    yesssssss i did that so glad i put that
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    (Original post by the a* guy)
    does anyone want me to upload the paper?
    yes please
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    Wow that exam was very generous. I think i got the activation energy wrong, i put -611. I also think i got the suggest question wrong as i put that it was impure, when i think the answer was insufficient oxygen supply.
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    did anyone get carboxylic acid and ketone for the IR?
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    (Original post by niceguy95)
    I'm pretty sure it was

    IBr --------> I + Br. Initiation by homolytic fission

    Ch4 + Br --------> ch3 + hbr

    Ch3 + IBr -------> ch3I + Br

    Both. Being propagation

    Ch3. + Br ------> ch3br termination

    Not sure why people are getting I2 if it asked how ch3I and Hbr was formed
    i dont think a radical ibr can be recycled back into the equation
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    (Original post by the A* guy)
    Like If You would like me to upload the paper.
    lool nice liar we got here.
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    (Original post by the A* guy)
    Does anyone want me to upload the paper?
    yesssss plz
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    (Original post by Pataiiii)
    Did you get an answer in the 800's?
    Nope, 1600 ish I think
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    (Original post by the A* guy)
    Does anyone want me to upload the paper?
    Stupid question :P

    Yes please though
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    (Original post by Saif95)
    I probably lost a good ******* 30-40
    still potientailly a C dw
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    WHAT NO DISCUSSION!!!!



    :eek:
    :confused:
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    Loved this paper apart from the IR question..
    I was like.. err is that broad or sharp? Aldehyde? Ketone? 2 aldehydes? Lol.
    Ended up having butanal and butan-2-one but I think its wrong

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    (Original post by Dan_JR_12)
    Yeah I put N for the one which is extremely unreactive

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    Was N the first one on the list I can't remember haha
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    (Original post by yodawg321)
    Combustion Definition:

    I put the enthalpy change when a 1 mole of substance completely reacts with oxygen in standard conditions and states.
    Did you need the standard bits? It was enthalpy of combustion and not standard enthalpy of combustion


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    help!

    For the enthalpy change of formation,

    I didn't realise N2 was 0, so for my answer

    I wrote 4000 something + (9 x N2)

    How many marks?
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    (Original post by Farringtonn)
    Did you need the standard bits? It was enthalpy of combustion and not standard enthalpy of combustion


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    nope was only 2 marks, i put it there for safety :P
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    (Original post by Legal drugdealer)
    did anyone get carboxylic acid and ketone for the IR?
    It was Ketone and Aldehyde
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    (Original post by the A* guy)
    Does anyone want me to upload the paper?
    Yes!
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    (Original post by niceguy95)
    I'm pretty sure it was

    IBr --------> I + Br. Initiation by homolytic fission

    Ch4 + Br --------> ch3 + hbr

    Ch3 + IBr -------> ch3I + Br

    Both. Being propagation

    Ch3. + Br ------> ch3br termination

    Not sure why people are getting I2 if it asked how ch3I and Hbr was formed
    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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    boundaries are going to be quite high i think, it was a gift of a paper.
 
 
 
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