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OCR Chemistry B (Salters) F334/F335 Exam Thread 2016 (14th/22nd June)

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Original post by lyricalvibe
It is but did they mention they added water though? I just did the me hnism for nucleophilic addition leaving the anion produced as it were

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I believe they stated that it was in a dilute acid so the product would have either received the hydrogen from H+ or from the water molecule.
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Original post by IBerrr
Look at the pic of the isomers for that answer I sent in this thread.


I have
Original post by millss
the grade boundaries are already out?? where?? i thought they only made them once all the papers had been marked :frown:


That's what I thought, I can't find it anywhere only 2015! Im so confused... :confused:
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Original post by ezaraf
4 points:
1. what a sh** paper
2. i got got got 2 e/z isomers
3. what is the type of copolymerisation
4. definitely a sh** paper


Copolymerisation is polyester
Original post by lyricalvibe
It is but did they mention they added water though? I just did the me hnism for nucleophilic addition leaving the anion produced as it were

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No didn't need water, it said acidic in the question, I added it just to show what is happening. So this is correct yeah
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Original post by ShalomieR
That's what I thought, I can't find it anywhere only 2015! Im so confused... :confused:


im fairly sure they have to look at how the whole country performed and then work them out based on percentiles??? like normally they come out the day before results day
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Original post by ShalomieR
That's what I thought, I can't find it anywhere only 2015! Im so confused... :confused:


The real OCR grade boundaries for this exam have not been produced yet - the exam hasn't been marked so you're not going to find any real grade boundaries. People have, however, estimated the rough grade boundaries by the relative difficulty though of course, until OCR publish the real grade boundaries, these are just 'theory'.

UMS boundaries however don't change much if at all from year to year (I think) so basically it's saying how many UMS points you get for a certain grade e.g. 80 UMS for an A grade.
(edited 7 years ago)
Last year an A was 65, this year it would be max 64 ... and minimum 62 ish ... what do you guys think?
I think they meant the UMS grade boundaries are out, which is the same every year, just taking a guess though tbh
Original post by _MAT_
Copolymerisation is polyester


ugh thats so stupid, why did have to ask it that way >:frown:
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Original post by ezaraf
ugh thats so stupid, why did have to ask it that way >:frown:


Bit of a strange question, I doubt many will have got that right
Original post by _MAT_
The real OCR grade boundaries for this exam have not been produced yet - the exam hasn't been marked so you're not going to find any real grade boundaries. People have, however, estimated the rough grade boundaries by the relative difficulty though of course, until OCR publish the real grade boundaries, these are just 'theory'.


Thank you so much I was freaking out and thought they were going to do something completely different this year!!
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Original post by ShalomieR
Thank you so much I was freaking out and thought they were going to do something completely different this year!!


Ahahah I suspect there's a large delay between the papers being done and people actually starting the marking to prevent leaking of the mark scheme?
I did one of the drawings in pencil would they still see it?
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Original post by Kira Yagami
I did one of the drawings in pencil would they still see it?


Yes in fact they ask for drawing in HB pencil

If you look at the examiner report for last year, one of the issues was examiners still being able to see rubbed out pencil so unless you have a really thin pencil (I don't know how you say it) it'll be fine.
(edited 7 years ago)
Original post by Kira Yagami
No didn't need water, it said acidic in the question, I added it just to show what is happening. So this is correct yeah


Ah ok, don't usually read context to save time :/ yeah the the product is correct but shouldn't the lone pair of electrons have come from the nitrogen?

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Original post by Kira Yagami
Last year an A was 65, this year it would be max 64 ... and minimum 62 ish ... what do you guys think?


I thinkas long as it's below 64 I will scrape an A, hbu?

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Original post by lyricalvibe
Ah ok, don't usually read context to save time :/ yeah the the product is correct but shouldn't the lone pair of electrons have come from the nitrogen?

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No. The lone pair is on the Carbon.
Original post by Kira Yagami
No. The lone pair is on the Carbon.


I don't even know why I was so sure it was the other way round, I've made so many errors like that, how many marks was the Q?

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