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

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Original post by Dinasaurus
Think I might go to sleep, and try and wake up for 6 or something for some last minute working.


Good luck my mate!
Original post by Dinasaurus
Hmm I got 4.42 hahaha, damn, tried again and got 4.12 any one else got an idea?


I did this paper yesterday and also got 4.12. It happens when you use the initial concentration (n=cV) instead of working out the amount of acid that is reacted with the sodium hydroxide, then using these moles to work out the concentration, then using this concentration in Kaacidoversalt


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We've got this guys!!
Morning :h: Any last minute equations/questions?
Original post by lai812matthew
glucose for photosynthesis


yeah i getmoles of glucose is 6
is Q for given in the question for one mole?
Original post by asunny465
yeah i getmoles of glucose is 6
is Q for given in the question for one mole?


carbon dioxide: glucose= 6:1 mole ratio so times 6.
Good luck everyone :smile:
what is the advantage of using hydrogen in a fuel cell?
what is the advantage of using methanol in a fuel cell?
Original post by lai812matthew
what is the advantage of using hydrogen in a fuel cell?
what is the advantage of using methanol in a fuel cell?


advantage of hydrogen fuel cell
- more efficient
-only produces water and CO2

advantages of methanol in fuel cell?
- made from biomas
-renewable
-source of hydrogen in liquid form hence easier to store
Original post by luckycactus1337
advantage of hydrogen fuel cell
- more efficient
-only produces water and CO2

advantages of methanol in fuel cell?
- made from biomas
-renewable
-source of hydrogen in liquid form hence easier to store


hydrogen fuel cells don't produce CO2 do they?
Guys!

pH of strong acids, when do you k ow you are supposed to take square root of Ka and minus log it?

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Original post by a209150
Guys!

pH of strong acids, when do you k ow you are supposed to take square root of Ka and minus log it?

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Yup
I mean when do we do this? Because normally we just minus log the concentration.

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Morning guys, you excited yet? I was just wandering if we need to know how to calculate the entropy change of the surrounding in this exam. Its not in the official textbook but it is in the revision guides ? thanks
Original post by a209150
Guys!

pH of strong acids, when do you k ow you are supposed to take square root of Ka and minus log it?

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For strong acids isn't the [H+] = to the [Acid]??? Then just -log it
For energy calculations do yu use temperature in kelvin or celcius
Original post by cicilyvontes
For energy calculations do yu use temperature in kelvin or celcius

Gibbs Free Energy? Kelvin :smile:
Good luck everyone :smile:
I got X as 4 not really sure tho, overall it was alright
Had no clue for half of q7, apart from that it was okay. Was this an easy or a hard paper?

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