OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012
Chemistry exam discussion - share revision tips in preparation for GCSE, A Level and other chemistry exams and discuss how they went afterwards.
-
- Reputation:
- Adored and Respected Member
- Posts: 501
Re: OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012about this one, could you just let me know which one happens at the positive electrode and which at the negative please. cheers(Original post by clownfish)
7dii) and the methanol fuel cell:
CH3OH + H2O --> CO2 + 6e- + 6H+
3/2 O2 + 6H+ + 6e- --> 3H2O
Hope that helps.
-
- Reputation:
- Adored and Respected Member
- Location: Surrey
Re: OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012Nope I've seen someone get 150/150 o.o They said they did a lot of past papers though(Original post by Klaw)
Is it impossible to get 140/150 UMS? -
- Reputation:
- Full Member
- Posts: 106
Re: OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012(Original post by Yonko)
can someone please help me with this ques....
How would u determine the order of a reaction experimentally?...
Determining the order of reaction is very easy.
http://www.youtube.com/watch?v=l_yY3H-hVmkLast edited by Carbon12; 26-05-2012 at 15:20. -
- Reputation:
- Overlord in Training
- Posts: 3,319
Re: OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012(Original post by Yonko)
can someone please help me with this ques....
How would u determine the order of a reaction experimentally?...
You have to set a few experiments where you keep the concentration of one reactant constant and change the other then monitor the rate of reaction and do the same for Reactant B. -
- Reputation:
- Adored and Respected Member
- Posts: 452
Re: OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012thank you soo much!!!!(Original post by Killjoy-)
I usually use this site for maths past papers, but there's no reason they shouldn't have chem ones:
http://www.xtremepapers.com/
-
- Reputation:
- New Member
- Posts: 14
Re: OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012Wow even with a lot of past papers I can't imagine getting that(Original post by Cath-ay)
Nope I've seen someone get 150/150 o.o They said they did a lot of past papers though
-
- Reputation:
- New Member
- Posts: 14
Re: OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012http://getrevising.co.uk/search?q=OC...+Chemistry&go=
There are a lot of notes and stuff there, such as a power point covering transition metals -
- Reputation:
- New Member
- Posts: 3
Re: OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012thanx....(Original post by Carbon12)
Determining the order of reaction is very easy.
http://www.youtube.com/watch?v=l_yY3H-hVmk -
- Reputation:
- New Member
- Posts: 3
Re: OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012thanx........(Original post by LifeIsGood)
You have to set a few experiments where you keep the concentration of one reactant constant and change the other then monitor the rate of reaction and do the same for Reactant B. -
- Reputation:
- Respected Member
- Posts: 180
Re: OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012Would this be an acceptable definition for 'Enthalpy Change of Hydration':
Enthalpy change which accompanies the formation of an infinitely dilute solution when 1 mole of gaseous ions completely dissolves in water to form 1 mole of aqueous ions -
- Reputation:
- Overlord in Training
- Location: Alagaësia
- Posts: 3,498
Re: OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012They're kind of the same thing, I would cut out the first one, and take the accepted definition in your textbook, can't go wrong with those.(Original post by --NWzD9--)
Would this be an acceptable definition for 'Enthalpy Change of Hydration':
Enthalpy change which accompanies the formation of an infinitely dilute solution when 1 mole of gaseous ions completely dissolves in water to form 1 mole of aqueous ions
Mine would be something like: The enthalpy change that occurs when one mole of isolated gaseous ions completely dissolves in water to form one mole of aqueous ions, under standard conditions.Last edited by Oromis263; 27-05-2012 at 12:31. -
- Reputation:
- Exalted and Worshipped Member
- Posts: 1,083
Re: OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012Paper was in this thread: http://www.thestudentroom.co.uk/show...2#post37542315(Original post by Raj K)
Has anyone got the Jan 2012 paper and mark scheme for this?
Link doesn't include the MS though. -
- Reputation:
- Adored and Respected Member
- Location: Surrey
Re: OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012(Original post by Killjoy-)
Paper was in this thread: http://www.thestudentroom.co.uk/show...2#post37542315
Link doesn't include the MS though.
MS is further down the page that killjoy link you to - posted by me(Original post by Raj K)
Has anyone got the Jan 2012 paper and mark scheme for this?
-
- Reputation:
- Benevolent Member
- Posts: 785
Re: OCR Chemistry A F325 Equilibria, Energetics and Elements Wed 13 June 2012thankyou !!!!!(Original post by Killjoy-)
Paper was in this thread: http://www.thestudentroom.co.uk/show...2#post37542315
Link doesn't include the MS though.
