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

1. Can someone give me the "mark scheme style" definitions for initiation, propagation and termination (I understand them, just don't wanna lose silly marks for missing out key phrases if they do come up)
2. (Original post by Branny101)
Ahh awesome, thanks for the link

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no problem!
3. (Original post by ActaNonVerba)
Can someone give me the "mark scheme style" definitions for initiation, propagation and termination (I understand them, just don't wanna lose silly marks for missing out key phrases if they do come up)
I'll try
Propagation- radical replaced by another with a radical on both sides of equation
4. Hi does anyone know where I could find the grade boundaries for the legacy papers?
5. hey guys, really dreading this exam as i gather most of you are -_-
here's the question:

1f. Scientists monitor the composition of the Earth's atmosphere. They have found that the concentration of carbon dioxide in dry, unpolluted tropospheric air has increased from 300ppm to around 380ppm between 1900 and the present day.
i) Taking the present day value to be 380ppm, calculate the increase in the percentage of carbon dioxide in the air between 1900 and the present day.

I converted the values into percentages so,
380/100000=0.0038% and 300/100000=0.0030%
so the difference between these values is 0.008, therefore 0.008/0.003

but according to the mark scheme its meant to be 0.008/8*10^ -3.
Any help would be appreciated, its only one mark but its really frustrating me. Thanks in advance
6. (Original post by hen4r)
Hi does anyone know where I could find the grade boundaries for the legacy papers?
are there any ones you wanted in particular? cos we got them on the school VLE, i could download the one you wanted onto here if you want?
7. (Original post by Zarah01)
hey guys, really dreading this exam as i gather most of you are -_-
here's the question:

1f. Scientists monitor the composition of the Earth's atmosphere. They have found that the concentration of carbon dioxide in dry, unpolluted tropospheric air has increased from 300ppm to around 380ppm between 1900 and the present day.
i) Taking the present day value to be 380ppm, calculate the increase in the percentage of carbon dioxide in the air between 1900 and the present day.

I converted the values into percentages so,
380/100000=0.0038% and 300/100000=0.0030%
so the difference between these values is 0.008, therefore 0.008/0.003

but according to the mark scheme its meant to be 0.008/8*10^ -3.
Any help would be appreciated, its only one mark but its really frustrating me. Thanks in advance
You need to divide by ten thousand; not a hundred thousand.
8. (Original post by Zarah01)
are there any ones you wanted in particular? cos we got them on the school VLE, i could download the one you wanted onto here if you want?
That would be so wonderful if you could! Thanks! I'm looking for June 2008 if that's possible
9. (Original post by Zarah01)
are there any ones you wanted in particular? cos we got them on the school VLE, i could download the one you wanted onto here if you want?
Can you upload all old legacy papers please? I might have time to o them later on.
10. (Original post by krisshP)
Can you upload all old legacy papers please? I might have time to o them later on.
Are you kidding me? You haven't done them yet?! Each one takes around an hour and 45 minutes!

KIDDDING
11. (Original post by usycool1)
You need to divide by ten thousand; not a hundred thousand.
oh yeah >.< silly mistakes, still dont know how to do the q though
12. (Original post by hen4r)
That would be so wonderful if you could! Thanks! I'm looking for June 2008 if that's possible
13. (Original post by krisshP)
Can you upload all old legacy papers please? I might have time to o them later on.
the papers are on the ocr webage:
http://www.ocr.org.uk/qualifications...ers-h035-h435/
14. Thank you so much!
15. (Original post by Zarah01)
hey guys, really dreading this exam as i gather most of you are -_-
here's the question:

1f. Scientists monitor the composition of the Earth's atmosphere. They have found that the concentration of carbon dioxide in dry, unpolluted tropospheric air has increased from 300ppm to around 380ppm between 1900 and the present day.
i) Taking the present day value to be 380ppm, calculate the increase in the percentage of carbon dioxide in the air between 1900 and the present day.

I converted the values into percentages so,
380/100000=0.0038% and 300/100000=0.0030%
so the difference between these values is 0.008, therefore 0.008/0.003

but according to the mark scheme its meant to be 0.008/8*10^ -3.
Any help would be appreciated, its only one mark but its really frustrating me. Thanks in advance
You don't need to divide by 0.003 because they are in percentage, so the answer is just the difference between the two percentages.

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16. In Jan 2013 q4ci and q4d I don't understand how you get the marks scheme answers. Can somebody please explain?

Thanks
17. (Original post by krisshP)
In Jan 2013 q4ci and q4d I don't understand how you get the marks scheme answers. Can somebody please explain?

Thanks
is the answer for 4d thujone?
18. (Original post by nukethemaly)
is the answer for 4d thujone?
Yeah, but how did you know?
19. (Original post by krisshP)
Yeah, but how did you know?
because it's not an alkene haha
20. (Original post by nukethemaly)
because it's not an alkene haha
Q4ci?

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