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

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Original post by super121
How did everyone find it overall?


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Very average. I think the grade boundaries might go up to like June 2012 to around 80 for an A.
Original post by NielsBohrsDad
for the funct group i wrote alkene
and the one after that i wrote phenol!!


It said in that question not to write down the hydroxyl group, so it's not phenol, but ether :smile:
Reply 802
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super121
5
Original post by abzy1234
Very average. I think the grade boundaries might go up to like June 2012 to around 80 for an A.


Yea, I think so too. I sat the June and I found this one easier


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Reply 803
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tasniaa
I wrote ester instead of ether, damn.
I thought it was alright, how bout everyone else?

I know of one mark I've dropped (first question I had 2 Br on the molecule not 4!)

Did everyone remember to convert 200kg to 200000g? :tongue:
Original post by super121
Yea, I think so too. I sat the June and I found this one easier


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Wholly agree. The pre-release questions in this paper were more straight forward I feel in comparison to last year.
Reply 806
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juniorx
2
Original post by abzy1234
2 marks :smile:


wait i probably didn't put diene i might have remebered it wrongly but if you draw out 2,6 di methyl oct5 ene is that also the same as 2ethyl 6 methyl hept 2 ene ? can someone confirm this by drawing it out now????
(edited 10 years ago)
Reply 807
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tasniaa
I thought the exam went well, now I'm not too sure. unofficial mark scheme anyone?
Q 1. Was 3,7-dimethyloct-3-ene
Original post by Davelittle
I thought it was alright, how bout everyone else?

I know of one mark I've dropped (first question I had 2 Br on the molecule not 4!)

Did everyone remember to convert 200kg to 200000g? :tongue:


Yah, I thought it was a really nice paper!

And yeah, but I nearly got caught out by the mole ratio! If I'm correct, this was the way to do it:

200kg= 200,000g

Mr of NaCl= 58.5

No. of moles in NaCl= 200000/58.5

2 moles of NaCl is required to produce one mole of chlorine, so (200000/58.5)/2.

Then 24dm3 multiplied by (200000/58.5)/2. Which should give an answer of around 41,000 to 3.sf.
Reply 810
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Fillly
What did people put for that question about the relationship between global warming and the concentration in the trophosphere etc? Cant remember it exactly..
Reply 811
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super121
5
Original post by abzy1234
Yah, I thought it was a really nice paper!

And yeah, but I nearly got caught out by the mole ratio! If I'm correct, this was the way to do it:

200kg= 200,000g

Mr of NaCl= 58.5

No. of moles in NaCl= 200000/58.5

2 moles of NaCl is required to produce one mole of chlorine, so (200000/58.5)/2.

Then 24dm3 multiplied by (200000/58.5)/2. Which should give an answer of around 41,000 to 3.sf.


Didn't we have to work out the Mr of 2NaCl, apart from that I did the same steps


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Original post by abzy1234
Yah, I thought it was a really nice paper!

And yeah, but I nearly got caught out by the mole ratio! If I'm correct, this was the way to do it:

200kg= 200,000g

Mr of NaCl= 58.5

No. of moles in NaCl= 200000/58.5

2 moles of NaCl is required to produce one mole of chlorine, so (200000/58.5)/2.

Then 24dm3 multiplied by (200000/58.5)/2. Which should give an answer of around 41,000 to 3.sf.



It didn't ask for sig fig so I put 41025dm^3

Seems right to me though!
Reply 813
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tasniaa
Original post by super121
Didn't we have to work out the Mr of 2NaCl, apart from that I did the same steps


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I worked out 2nacl too
Reply 814
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super121
5
Original post by Fillly
What did people put for that question about the relationship between global warming and the concentration in the trophosphere etc? Cant remember it exactly..


There's a correlation between higher levels of greenhouse gases and increasing temp. It came up in one of the past papers


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Original post by super121
Didn't we have to work out the Mr of 2NaCl, apart from that I did the same steps


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No just NaCl, the 2:1 ratio of NaCl to Cl2 meant you had to half the moles of NaCl (not multiply the Mr by 2).
Reply 816
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juniorx
2
Original post by juniorx
wait i probably didn't put diene i might have remebered it wrongly but if you draw out 2,6 di methyl oct5 ene is that also the same as 2ethyl 6 methyl hept 2 ene ? can someone confirm this by drawing it out now????


if this is wrong can someone tell me why it is wrong?
I put the same as you did, don't worry I'm pretty sure the mark scheme will accept both - in past papers they always do :smile:
Reply 818
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super121
5
Original post by Davelittle
No just NaCl, the 2:1 ratio of NaCl meant you had to half the moles of NaCl (not multiply the Mr by 2)


I did 2 NaCl them divided the no. of moles by 2 :/


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Reply 819
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juniorx
2
Original post by Davelittle
It didn't ask for sig fig so I put 41025dm^3

Seems right to me though!
might lose 1 mark for accuracy?
(edited 10 years ago)

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