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Edexcel Chemistry AS Unit 2- 16th January 2013 Watch

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    (Original post by david tennant)
    does anyone know what the first step for the formation of no radicals is, the george facer book does't give it...
    no2 ---> no* + o* ?
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    (Original post by David Tennant)
    Does anyone know what the first step for the formation of NO radicals is, the George Facer book does't give it...
    Which bit do we need that for?
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    (Original post by Weaselmoose)
    Which bit do we need that for?
    Green chemistry ...
    Ok question guys:



    Why do HFC's not break down in the stratosphere?
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    (Original post by Exams v__v)
    no2 ---> no* + o* ?
    Yeah, thanks ...
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    (Original post by David Tennant)
    Green chemistry ...
    Ok question guys:



    Why do HFC's not break down in the stratosphere?
    hi
    the h means it can be oxidised ?

    so cl. are not released so easily
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    (Original post by jojo1995)
    hi
    the h means it can be oxidised ?

    so cl. are not released so easily
    Yeah brilliant...
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    Can someone help me with Jan 2012 Mcq 16)a)? :s why not A?
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    And why are HCFCs considered better than CFCs?
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    (Original post by David Tennant)
    Yeah brilliant...
    yay thanks
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    (Original post by Exams v__v)
    Can someone help me with Jan 2012 Mcq 16)a)? :s why not A?
    because the equilibrium moves towards the right, but both n204 and 2no2 aRE still present, just more n202 being formed than before so the colour becomes less brown
    sorry this is really muddled
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    (Original post by jojo1995)
    because the equilibrium moves towards the right, but both n204 and 2no2 aRE still present, just more n202 being formed than before so the colour becomes less brown
    sorry this is really muddled
    Got it, thank you soo much!
    But then technically, shouldn't part b be pale brown too? :s
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    (Original post by Exams v__v)
    Got it, thank you soo much!
    But then technically, shouldn't part b be pale brown too? :s
    No because the forward reaction is exothermic and so when you increase the temperature, to decrease the temperature it will shift in the endothermic direction (to the left) to make it darker brown...
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    (Original post by David Tennant)
    No because the forward reaction is exothermic and so when you increase the temperature, to decrease the temperature it will shift in the endothermic direction (to the left) to make it darker brown...
    Thanks! ^^
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    What are the conditions of reacting nh3 with a halgoenoalkane?
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    (Original post by Exams v__v)
    What are the conditions of reacting nh3 with a halgoenoalkane?
    Ethanolic under reflux?
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    (Original post by David Tennant)
    Ethanolic under reflux?
    Oh sure? I read that somewhere, and somewhere else, just nh3 at rtp.
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    The redox equations for H2SO4 --> SO2 and HNO3 --> NO2? :|
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    good luck for tomorrow guys !!!
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    (Original post by constandinos)
    good luck for tomorrow guys !!!
    Thanks
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    I'll be contributing to a lower grade boundaries for you guys
 
 
 
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