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# Advanced notice paper F332 OCR SALTERS B watch

1. 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
2. (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.
3. 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.
4. (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.

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5. (Original post by super121)

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

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

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8. so to work out a ppb, do we multiply the percentage by a billion and divide by 100?
9. (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?
10. (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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11. 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 )
12. is this for the advanced notice, or general questions? if they are general pop them up on the main thread.
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
14. (Original post by TheNote)
is this for the advanced notice, or general questions? if they are general pop them up on the main thread.
15. for for it
16. 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
17. 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%
18. 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 ?
19. (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
20. hey guys, this is the question sheet that you wanted. I'd appreciate it if anyone could create an answer document please
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21. F332 adv notice (June 2013) predicted Qs.pdf (117.2 KB, 210 views)

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