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# OCR Chemistry F322~ 4th June 2013~ AS Chemistry watch

• View Poll Results: How did you find the exam
Hard A= 72
42
15.22%
It was okay A= 76
99
35.87%
Easy A= 79
75
27.17%
Very Easy A=82
60
21.74%

1. (Original post by GeneralOJB)
Attachment 221928

Here's a challenging question for you all - if you can do this you can do any on the exam.

Attachment 221935

Even harder
What exam board is that. It took me about half an hour to do the first one. Surely that is not AS level. Is it -11 btw, it best be, if not can you please explain it
2. http://www.ocr.org.uk/Images/65130-q...-resources.pdf

Thanks ))
3. (Original post by ellie2996)
http://www.ocr.org.uk/Images/65130-q...-resources.pdf

Thanks ))
You know 4 moles of NO releases 909KJ. 1 mole of NO would therefore release 909/4 KJ. 2.5x10^5moles therefore releases 2.5x10^5x(909/4)=56812500 which iirc is shortened to 3 sig figs but you don't have to.
4. (Original post by ellie2996)
http://www.ocr.org.uk/Images/65130-q...-resources.pdf

Thanks ))
Divide 2.5x10^5 by 4 and then multiply but 909kJ
5. (Original post by JimmyA*)
What exam board is that. It took me about half an hour to do the first one. Surely that is not AS level. Is it -11 btw, it best be, if not can you please explain it
Yeah I tried working it out and got -11 as well that is one tough question, will not come in the exam hopefully

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6. (Original post by Jimmy20002012)
Yeah I tried working it out and got -11 as well that is one tough question, will not come in the exam hopefully

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I'm sure my way must be a bad way it took ages. I divided the equations and swapped them around until they all cancelled out. Is that how you did it?
7. (Original post by JimmyA*)
I'm sure my way must be a bad way it took ages. I divided the equations and swapped them around until they all cancelled out. Is that how you did it?
I reversed the reactions to master overall equation, then just cancelled we won't get this type of question in the exam will we, as it took me like 30 minutes to do

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8. (Original post by JimmyA*)
I'm sure my way must be a bad way it took ages. I divided the equations and swapped them around until they all cancelled out. Is that how you did it?

(Original post by Jimmy20002012)
I reversed the reactions to master overall equation, then just cancelled we won't get this type of question in the exam will we, as it took me like 30 minutes to do

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I highly doubt it lol. most cycles/enthalpy calculations can be done in a few minutes at the most.
9. (Original post by needtosucceed=))
I highly doubt it lol. most cycles/enthalpy calculations can be done in a few minutes at the most.
If they did I'm sure there will be a few unhappy people on here on Tuesday.
10. (Original post by needtosucceed=))
I highly doubt it lol. most cycles/enthalpy calculations can be done in a few minutes at the most.
Takes me a minute max to do the Hess's calculations

Always works
11. (Original post by JimmyA*)
What exam board is that. It took me about half an hour to do the first one. Surely that is not AS level. Is it -11 btw, it best be, if not can you please explain it
It's not from an exam board, it's from a work sheet. The answer is indeed -11 KJ, well done.

Half an hour is a bit much though!
12. (Original post by TheFootyKing19)
Takes me a minute max to do the Hess's calculations

Always works
Not the one above, that one is solid

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13. How many UMS mark in an A just for F322 guys???
14. (Original post by TheFootyKing19)
Takes me a minute max to do the Hess's calculations

Always works
same! doing the formulas kinda confuses me.
15. Is this your last exam ... ?

I got two and i am DONEE
16. (Original post by Jimmy20002012)
I reversed the reactions to master overall equation, then just cancelled we won't get this type of question in the exam will we, as it took me like 30 minutes to do

Posted from TSR Mobile
Hi could u briefly explain how to do thse kinda questions... it even cam up in Jan 2012 paper Question 3 b ii

THANK YOUU
17. (Original post by GeneralOJB)
It's not from an exam board, it's from a work sheet. The answer is indeed -11 KJ, well done.

Half an hour is a bit much though!
18. (Original post by Jacksgap)
Is this your last exam ... ?

I got two and i am DONEE
Nope I've got 8 left. F322, F324, F325, C3, C4, BY5 and General studies(2 exams)
19. (Original post by JimmyA*)
Nope I've got 8 left. F322, F324, F325, C3, C4, BY5 and General studies(2 exams)

Retake student? Good luck...
20. (Original post by jazzynutter)

Hope this helps?

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