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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 Jimmy!
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    how is everyone feeling about this exam? as the Jan 2013 was reasonably good and unit 1 paper in may 2013 was really easy I think this is going to be either hard or doable.
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    I just looked over the specification and it seems we don't need to state Hess' Law?

    Can anyone confirm this ??
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    Heres more questions people forget. What type of UV light does the ozone absorb? What UV light causes skin cancer? How does the ozone layer work?
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    Thanks Jimmy!

    (Might just say it as well to get a thumbs up)
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    Could anyone pls help me with question 6c)i on June 2010 paper?

    http://www.ocr.org.uk/Images/65130-q...-resources.pdf
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    (Original post by sohailkm96)
    Sorry I don't think I typed out it correctly, I meant that a high atom economy shows a high amount reactants is being converted to the desired product.
    Is this sohail from beckfoot school lol?
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    Suggest two factors that affect the contribution of a greenhouse gas to global warming (2)
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    (Original post by Shaadi Baba)
    Could anyone pls help me with question 6c)i on June 2010 paper?

    http://www.ocr.org.uk/Images/65130-q...-resources.pdf
    On same question:
    (c) Only a small proportion of the candidates in (i) realised that the 909 kJ of heat released
    comes from 4 mol of NO; so the correct answer was 5.68 × 107 kJ.
    In (ii), candidates needed to be more specific in their answers – it was not sufficient to write that
    energy would be provided.

    IDK how to do it though
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    (Original post by Beanjamin)
    Is this sohail from beckfoot school lol?
    Lol Ben yeah it's me.
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    (Original post by JimmyA*)
    Heres more questions people forget. What type of UV light does the ozone absorb? What UV light causes skin cancer? How does the ozone layer work?
    UV-C is absorbed by the ozone, both UV-B and UV-C can cause skin cancer, and I'm not sure about the last one, does it just absorb the UV?
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    (Original post by Beanjamin)
    Is this sohail from beckfoot school lol?
    Don't tell me you are Ben from from beckfoot school?
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    Hi everyone! Can anyone define le chatelier's principle for me?
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    (Original post by sohailkm96)
    Lol Ben yeah it's me.
    Hahah that's well funny, so are you feeling prepared for the exam?
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    Does anybody have the january 2013 and the mark scheme? Please can I have it?
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    (Original post by simifeltham)
    Suggest two factors that affect the contribution of a greenhouse gas to global warming (2)
    The absorption of infrared radiation and the atmospheric concentration
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    (Original post by Shaadi Baba)
    Could anyone pls help me with question 6c)i on June 2010 paper?

    http://www.ocr.org.uk/Images/65130-q...-resources.pdf
    You divide the enthalpy change by four to find the enthalpy change for 1 mole of NO. Then you multiply it by the number of moles given to find energy
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    (Original post by Sara_A)
    The absorption of infrared radiation and the atmospheric concentration
    make sure you say the the IR absorption depends on the type of bond present. also the lifetime of ghgs
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    (Original post by JimmyA*)
    Here's a few good questions:
    Why does the pi-bond break and not the sigma bond?(it's a question which alot of people forget and hasn't come up for a while)
    What is the advantage of using the ziegler-natta process over radical polymerisation?
    What are the current problems with storing Carbon in stable minerals?
    Would you be able to post the answers to those questions please?

    Posted from TSR Mobile
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    (Original post by shomshomni)
    Hi everyone! Can anyone define le chatelier's principle for me?
    The position of equilibrium will shift so to minimize the effect of any change in conditions.
 
 
 
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