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    Anyone else panicking now? Or just me that completely forgot about the pre-release :'( trawling the forums for as many possible questions as possible and just cramming tonight :/ At least I have tomorrow morning
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    (Original post by Alivere)
    Anyone else panicking now? Or just me that completely forgot about the pre-release :'( trawling the forums for as many possible questions as possible and just cramming tonight :/ At least I have tomorrow morning
    just revise the nitrogen part of atmosphere, look up the bolded words in the booklet, remember that they give you the booklet in the exam.
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    To anyone worry about tyhe ppbv and the ppmv, please learn to use that fact that you need to put the ppmv over a million and ppbv over a billion and multiply by 100, using 10,000 can confuse you in the exam and you mgiht divide by 10000 instead of a 100000 etc. so please do it properly.
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    (Original post by TheNote)
    To anyone worry about tyhe ppbv and the ppmv, please learn to use that fact that you need to put the ppmv over a million and ppbv over a billion and multiply by 100, using 10,000 can confuse you in the exam and you mgiht divide by 10000 instead of a 100000 etc. so please do it properly.
    You mean instead of 10,000,000


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    (Original post by super121)
    You mean instead of 10,000,000


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    Wait just to clear things up:
    ppm - 10000 multiplication/division
    ppbv - 100,000 multiplication/division?
    what about pptv?
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    (Original post by nukethemaly)
    Wait just to clear things up:
    ppm - 10000 multiplication/division
    ppbv - 100,000 multiplication/division?
    what about pptv?
    10,000,000 is ppb
    10,000,000,000 is ppt

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    (Original post by nukethemaly)
    Wait just to clear things up:
    ppm - 10000 multiplication/division
    ppbv - 100,000 multiplication/division?
    what about pptv?
    ppb is 10,000,000
    ppt is 10,000,000,000


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    so to work out a ppb, do we multiply the percentage by a billion and divide by 100?
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    (Original post by super121)
    ppb is 10,000,000
    ppt is 10,000,000,000


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    with this method I can just do the calculations straight away right? I don't need to first divide my percentage by 100 or anything, correct?
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    (Original post by nukethemaly)
    with this method I can just do the calculations straight away right? I don't need to first divide my percentage by 100 or anything, correct?
    Yep


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    hey guys i'm gonna post 4 questions from 11 till midnight every 10 mins ( found them online) to get us all thinking yh ? good idea or not ( I will post the whole document at the end as well )
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    is this for the advanced notice, or general questions? if they are general pop them up on the main thread.
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    (Original post by madrevision)
    hey guys i'm gonna post 4 questions from 11 till midnight every 10 mins ( found them online) to get us all thinking yh ? good idea or not ( I will post the whole document at the end as well )
    Yessss brilliant idea
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    (Original post by TheNote)
    is this for the advanced notice, or general questions? if they are general pop them up on the main thread.
    for the advance notice
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    for for it
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    1· How does photolysis play a part in the destruction of N2O in the stratosphere?
    · Use a series of equations to show how NO acts in the catalytic destruction of ozone?
    · What is meant by the term photolysis ?
    · Convert 100 parts per billion to a percentage, for the level of NOX in urban areas
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    1. Breaks down N2O, N2O absorbs the light and becomes excited which breaks the bonds.
    - NO + O3 > NO2 + O2
    NO is later restored when NO2 > NO + O so it's a catalyst.-
    photolysis describes a chemical reaction involving the absorbtion of light.
    - (100/10^9) * 100 = 1*10^-5%
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    And....2.· Why is the N2O (liquid) into N2O (gas) not a true dynamic equilibrium ?
    · Describe how photochemical smog can be harmful to:
    (a) the environment ? (b) Humans ?
    · The article mentions a reaction with HO radicals, what is a radical?
    Give examples of other radicals found in the stratosphere?
    · Suggest why the concentration of N2O in the atmosphere has increased since 1820 ?
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    (Original post by TheNote)
    1. Breaks down N2O, N2O absorbs the light and becomes excited which breaks the bonds.
    - NO + O3 > NO2 + O2
    NO is later restored when NO2 > NO + O so it's a catalyst.-
    photolysis describes a chemical reaction involving the absorbtion of light.
    - (100/10^9) * 100 = 1*10^-5%
    seeing as there are no answers can you keep posting and i'll create an answer document ? please thanks
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    hey guys, this is the question sheet that you wanted. I'd appreciate it if anyone could create an answer document please
    Attached Images
  1. File Type: pdf F332 adv notice (June 2013) predicted Qs.pdf (117.2 KB, 202 views)
 
 
 
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