Hey there! Sign in to join this conversationNew here? Join for free
    Offline

    0
    ReputationRep:
    Is there an unofficial mark scheme anywhere?
    Offline

    2
    ReputationRep:
    increase the surface area
    then impurities poison the catalyst for 2 marks 2 differetn questions
    Offline

    1
    ReputationRep:
    (Original post by FireBLue97)
    You know what I think there was another one of AQAs infamous typos the question was supposed to say standard enthalpy and instead they put enthalpy by accident so it means that this question will probably be free marks for everyone who has either put the 135 or the 62.5 hopefully
    this definitely won't be the case as the question clearly implied to use the full reaction instead of 1 mole produced. Also, AQA never give out free marks lol.
    Offline

    1
    ReputationRep:
    (Original post by chloeabeki)
    Would I lose marks for not having my coordinate bonds as arrows? I drew them like normal covalent bonds and now I'm kicking myself!
    **** i did the same
    Offline

    2
    ReputationRep:
    Canu put nh3 as the reagent to form R in the chromium question?
    I did R as Cr (oh)4 - so i was wondering
    Offline

    2
    ReputationRep:
    return of the potato cell so what are ur thoughts dividing by 2 or not dividing by 2
    Offline

    2
    ReputationRep:
    For the complex that we had to draw I used arrows instead of lines is that okay?
    Offline

    0
    ReputationRep:
    (Original post by SuruthiG)
    Canu put nh3 as the reagent to form R in the chromium question?
    I did R as Cr (oh)4 - so i was wondering
    I did that! I'm kicking myself for not thinking of CO2. Maybe its still right?
    Offline

    2
    ReputationRep:
    (Original post by SuruthiG)
    Canu put nh3 as the reagent to form R in the chromium question?
    I did R as Cr (oh)4 - so i was wondering
    I put R as [cr(oh)6]3- and the reagent as NaOH, NH3 would give [cr(nh3)6]3+ wouldnt it?
    Offline

    1
    ReputationRep:
    (Original post by FireBLue97)
    return of the potato cell so what are ur thoughts dividing by 2 or not dividing by 2
    You shouldn't have divided by 2. The answer was -135 or something similar.
    Offline

    1
    ReputationRep:
    (Original post by Jonnyss)
    Standard just means standard conditions tho??
    Like pressure and temp.
    yeah an enthalpy change does not have to be for one mole, only the case if it's one of the definition ones eg enthalpy of atomisation, that must produce one mole. So I don't see why you'd divide by 2.
    Offline

    2
    (Original post by Anam)
    Why a small pellet of vanadium used?
    (Original post by FireBLue97)
    increase the surface area
    then impurities poison the catalyst for 2 marks 2 differetn questions
    Spot on.

    (Original post by SuruthiG)
    Canu put nh3 as the reagent to form R in the chromium question?
    I did R as Cr (oh)4 - so i was wondering
    Wasn't R Cr(H2O)3(OH)3? If so then yes.

    (Original post by shiney101)
    For the complex that we had to draw I used arrows instead of lines is that okay?
    That's the proper way to do it
    Offline

    1
    ReputationRep:
    (Original post by Suits101)
    Was Gibbs free worth 3 marks?

    Also can anyone confirm for MgCl2 solubility one:

    Solubility decreases
    Forward reaction is exothermic
    Equilibrium shifts left to oppose increase in temperature
    That's what I put!
    Offline

    2
    (Original post by Lolaturface)
    That's what I put!
    Woo!
    Offline

    1
    ReputationRep:
    (Original post by Ginpls)
    Can someone please explain to me why the emf would increase if pressure of oxygen increases? Thanks!
    bumping this up because im wondering the same thing
    Offline

    1
    ReputationRep:
    (Original post by Darthsion100)
    I got something like 2328 KJ Mol-1 at first, then I halved the atomisation of oxygen to get 2404, but I think the original answer of 2328 was correct, because atomisation is for one mole, and you got 1 mole of O
    I got 2328!!
    Offline

    2
    ReputationRep:
    (Original post by Anam)
    I put R as [cr(oh)6]3- and the reagent as NaOH, NH3 would give [cr(nh3)6]3+ wouldnt it?
    Only in xs tho
    Offline

    1
    ReputationRep:
    http://www.thestudentroom.co.uk/show...2#post66014002

    Unofficial ms
    Offline

    2
    ReputationRep:
    (Original post by Suits101)
    Spot on.



    Wasn't R Cr(H2O)3(OH)3? If so then yes.



    That's the proper way to do it


    I think i got the letter wrong i mean the solution formed after Cr (oh)3 (h2o)3
    Offline

    2
    (Original post by SuruthiG)
    I think i got the letter wrong i mean the solution formed after Cr (oh)3 (h2o)3
    [Cr(OH)6]3-

    Reagent is NaOH (excess)
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Would you like to hibernate through the winter months?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.