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OCR A2 CHEMISTRY F324 and F325- 14th and 22nd June 2016- OFFICIAL THREAD

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Think 70/100 will be a B?
Original post by MrZebraCookie
Think 70/100 will be a B?


Very likely.
My sister took the exam yesterday and she looks anxious..I just want to know how much of the exam was repeated questions..how much are new questions..thanks
Original post by pezhman
[H+]= square root of Kw at 60c
[H+]= square root 9.313*10^-14
[H+]= 3.05*10^-7
-log 3.05*10^-7= 6.5
Since 6.5<7 so pH 7 is alkaline


hey i did exactly this is this right or?
Original post by lai812matthew
what do u mean by guessing


My sister took the exam yesterday and she looks anxious..I just want to know how much of the exam was repeated questions..how much are new questions..thanks
Reply 3965
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yiz
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Did anyone use redox systems 6 and 7 in that 6 marker?
Original post by Shakikila
My sister took the exam yesterday and she looks anxious..I just want to know how much of the exam was repeated questions..how much are new questions..thanks


if you are good enough, you actually don't have to guess any of them. it is an easy paper with f325 standards. (even though i made a lot of mistakes......)
it's normal to feel anxious after the exam if you need a very good grade, one careless mistake could cause everything.
Original post by yiz
Did anyone use redox systems 6 and 7 in that 6 marker?


I can't remember the numbers but were 6 and 7 the dichromate one and the complicated Fe one? I used those, I'm pretty sure u had to to show Cr 3+ acting as a reducing agent


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Reply 3968
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Original post by 1lilypad1
I can't remember the numbers but were 6 and 7 the dichromate one and the complicated Fe one? I used those, I'm pretty sure u had to to show Cr 3+ acting as a reducing agent


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I did that too. I was just wondering cos I saw that someone used 5 and 6 and I got a bit worried haha
1 and 2,6 and 7 were the two equations needed

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(edited 7 years ago)
Reply 3970
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Original post by HFancy1997
1 and 2,5 and 6 were the two equations needed

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We're 5 and6 the dichromate one and the Fe one?
Original post by yiz
We're 5 and6 the dichromate one and the Fe one?


Sorry I meant 6 and 7, edited now

But it was CrO7 <----> Cr3+
and the FeO4- one for 6 and 7

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Reply 3972
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Original post by HFancy1997
Sorry I meant 6 and 7, edited now

But it was CrO7 <----> Cr3+
and the FeO4- one for 6 and 7

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Thanks so much
Has an unofficial mark scheme been made yet?
Is there an unofficial markscheme ?
Grade boundary predictions from the A-Level Chemistry Twitter:

A*- 85
A- 77
B- 69
C- 61
D- 53
E- 44
Original post by GetOverHere
Calculate moles of acid and conjugate base, divide by 1000 to get concentration, use Kaacidoversalt to get [H+], - log to get 3.43 IIRC


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why do you have to work out concentration, didnt they give you the concentrations of the acid
Original post by lukemurp890
Grade boundary predictions from the A-Level Chemistry Twitter:

A*- 85
A- 77
B- 69
C- 61
D- 53
E- 44


Yeah I thought these too lol.

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Reply 3978
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four4
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For the redox 6 marker, i thought that we had to write the equation with each system and i wrote 2 with each system. Would i still get yhe mark for the 2 equations that we were actually meant to write or will it be marked wrong?
Original post by rachelsmith12
why do you have to work out concentration, didnt they give you the concentrations of the acid


original concentration not concentration in buffer

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