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# OCR B (Salters) F332 Tuesday 4th June 2013 Exam Discussion (Now Closed) watch

1. (Original post by madrevision)
just divide by 100 and multiply by 10 ^12 because if you had 2 pptv - it's the same as 2/1000 000 000 000 as a percentage is 2/1000 000 000 000 x 100.
or 2pptv is 2/ 10 ^12 percentage is 2/10^12 x 100 so you just undo what you've done(i.e divide where you've multiplied) this is kinda hard to explain with large numbers..
Ahhhhhhhhhhhh, ty

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2. (Original post by SyedaK)
I'm confused, is it basically:
pptv to percentage /10^12 x 100
percentage to pptv is x 10^12 /100?
yh basically (I prefer to start by dividing- by 100 to avoid confusion when you're working backwards) so you're right percentage to pptv is /100 then x 10^12
3. Can anyone draw vaccum filtration for me pls??
4. (Original post by tasniaa)
leave the gained electron clear? like this o
but colour the rest in?

I hope that makes sense xD
Put a square to show it came from something else
5. (Original post by madrevision)
yh basically (I prefer to start by dividing- by 100 to avoid confusion when you're working backwards) so you're right percentage to pptv is /100 then x 10^12
yeah but it's in parts per billion/trillion by VOLUME so it wouldn't be as simple to convert which confuses me!
6. In the jan 2011 paper i dont get the moles ratio question can somebody please explain it??

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7. (Original post by michmic)
Can anyone draw vaccum filtration for me pls??
This isn't on the spec?

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8. (Original post by super121)
Just open up the double bonds
The mark scheme has a double bond still in?

Take a look- June 2011 f332 Q 5. d) ii. I think!

Really confused :/
9. (Original post by NielsBohrsDad)
In the jan 2011 paper i dont get the moles ratio question can somebody please explain it??

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Imagine you had 58.5g of NaCl (Mr=58.5) that would mean you have 58.5/2g of KCl (because its 2:1 ratio of the compounds)

The moles=mass/Mr so (58.5/2)/74.5=0.39 (because it asks for moles ratio)
10. (Original post by diggerz)
i believe it is asking for the technique if its 3 marks or more so how you shake it with sodium hydrogen carbonate to remove acidic impurities then run off the chloroalkane layer and add anhydrous sodium sulfate to remove water then it is purified by distillation
Ohhh! Yeah I understand that. Thanks.
11. how do you draw a dot and cross for nitrous oxide?
12. Anyone has Jan 13 pastpaper and ms?
13. Is F332 an Am or Pm exam?
14. (Original post by carla6600)
yeah but it's in parts per billion/trillion by VOLUME so it wouldn't be as simple to convert which confuses me!
the volume thing shouldn't matter when you're simply converting from parts to percentage
15. (Original post by CoolRunner)
Is F332 an Am or Pm exam?
PM

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16. What could be some potential 7/6 mark questions, lots seem to have been on ozone so could they just repeat those questions?
17. Woot! I can finally go to sleep and revise early in the morning.
18. (Original post by Davelittle)
The mark scheme has a double bond still in?

Take a look- June 2011 f332 Q 5. d) ii. I think!

Really confused :/
Hmm, not sure myself! Is there anything in the advanced notice that might suggest why that is?

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19. (Original post by super121)
Hmm, not sure myself! Is there anything in the advanced notice that might suggest why that is?

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I didn't see anything that told you how to do it, I don't even get what has happened- it looks like one of the double bonds has broken and the other moved to the middle somehow :O
20. (Original post by LydiaO)
What could be some potential 7/6 mark questions, lots seem to have been on ozone so could they just repeat those questions?
Greenhouse gases, ozone formation and destruction, polymers which ones soluble etc.

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