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OCR Chemistry F322~ 4th June 2013~ AS Chemistry

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Original post by joe1545
I split the question into two bits, temperature and catalyst, drew two diagrams for each, both correct, then said how a decrease in activation means more molecules now have the activation energy, and showed the increase by shading the diagram, and the same for temp so rate would increase


yesssssss i did that so glad i put that
Reply 3221
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Aijahs
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Original post by the a* guy
does anyone want me to upload the paper?


yes please
Reply 3222
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JimmyA*
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Wow that exam was very generous. I think i got the activation energy wrong, i put -611. I also think i got the suggest question wrong as i put that it was impure, when i think the answer was insufficient oxygen supply.
did anyone get carboxylic acid and ketone for the IR?
Original post by niceguy95
I'm pretty sure it was

IBr --------> I + Br. Initiation by homolytic fission

Ch4 + Br --------> ch3 + hbr

Ch3 + IBr -------> ch3I + Br

Both. Being propagation

Ch3. + Br ------> ch3br termination

Not sure why people are getting I2 if it asked how ch3I and Hbr was formed


i dont think a radical ibr can be recycled back into the equation
Reply 3225
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Dizzie31
Original post by the A* guy
Like If You would like me to upload the paper.


lool nice liar we got here.
Original post by the A* guy
Does anyone want me to upload the paper?


yesssss plz
Reply 3227
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zangorou
Original post by Pataiiii
Did you get an answer in the 800's?


Nope, 1600 ish I think
Original post by the A* guy
Does anyone want me to upload the paper?


Stupid question :P

Yes please though :smile:
Original post by Saif95
I probably lost a good ******* 30-40

still potientailly a C :smile: dw
WHAT NO DISCUSSION!!!!



:eek:
:confused:
Reply 3231
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wndms
1
Loved this paper apart from the IR question..
I was like.. err is that broad or sharp? Aldehyde? Ketone? 2 aldehydes? Lol.
Ended up having butanal and butan-2-one but I think its wrong :frown:

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Reply 3232
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Lysipud
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Original post by Dan_JR_12
Yeah I put N for the one which is extremely unreactive :smile:

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Was N the first one on the list :s-smilie: I can't remember haha
Original post by yodawg321
Combustion Definition:

I put the enthalpy change when a 1 mole of substance completely reacts with oxygen in standard conditions and states.


Did you need the standard bits? It was enthalpy of combustion and not standard enthalpy of combustion


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help!

For the enthalpy change of formation,

I didn't realise N2 was 0, so for my answer

I wrote 4000 something + (9 x N2)

How many marks?
Reply 3235
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Dizzie31
Original post by Farringtonn
Did you need the standard bits? It was enthalpy of combustion and not standard enthalpy of combustion


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nope was only 2 marks, i put it there for safety :P
Original post by Legal drugdealer
did anyone get carboxylic acid and ketone for the IR?


It was Ketone and Aldehyde
Reply 3237
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Saif95
12
Original post by the A* guy
Does anyone want me to upload the paper?


Yes!
Reply 3238
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wndms
1
Original post by niceguy95
I'm pretty sure it was

IBr --------> I + Br. Initiation by homolytic fission

Ch4 + Br --------> ch3 + hbr

Ch3 + IBr -------> ch3I + Br

Both. Being propagation

Ch3. + Br ------> ch3br termination

Not sure why people are getting I2 if it asked how ch3I and Hbr was formed


Exactly what I got! I got confused so I wrote a mechanism for HBr which was easier, then replaced H with I...

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boundaries are going to be quite high i think, it was a gift of a paper.

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