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    (Original post by Kat12395)
    WE HAVE FINISHED THE MARK SCHEME (Finally!)
    https://docs.google.com/document/d/1...it?usp=sharing
    YOU'RE WELCOME!
    Thanks alot
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    Anyone know generally what the raw mark will be for 150 ums? Usually I just scale up the difference between boundaries like this (from Jan 13):

    60% - C - 56
    70% - B - 63
    80% - A - 70

    Difference between grades is 7 marks, so extrapolating gives...

    90% - A* - 77
    100% - 84

    Reckon this is a valid method to use?
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    (Original post by Raj Kang)
    No your wrong because kc can decrease by increasing concentration of reactants and decreasing the concentration of products it's all in the question
    Kc is a constant - it's value cannot change.
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    (Original post by Thatasianguy)
    does anyone remember the values for the Kc question, i just want to reconstruct it and see what i got.
    The values like the equilibrium concentrations and the volume
    Volume was 1dm3
    I think it was 2x10-3 for H2 at start, then 3x10-4 at equilibrium
    Then maybe 4x10-3 I2
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    (Original post by Kat12395)
    WE HAVE FINISHED THE MARK SCHEME (Finally!)
    https://docs.google.com/document/d/1...it?usp=sharing
    YOU'RE WELCOME!
    thanks a lot!!!! now I can relaxed
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    (Original post by Kat12395)
    WE HAVE FINISHED THE MARK SCHEME (Finally!)
    https://docs.google.com/document/d/1...it?usp=sharing
    YOU'RE WELCOME!
    thank you, a quick question for h2o not added, I put because it is not in the rate equation?


    I put Deta G> Tdeta S

    you put TdetaS < Deta G means same thing right?
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    (Original post by TauMuon)
    Anyone know generally what the raw mark will be for 150 ums? Usually I just scale up the difference between boundaries like this (from Jan 13):

    60% - C - 56
    70% - B - 63
    80% - A - 70

    Difference between grades is 7 marks, so extrapolating gives...

    90% - A* - 77
    100% - 84

    Reckon this is a valid method to use?
    Yes the difference between grades (deciles) is always the same.
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    (Original post by Kat12395)
    WE HAVE FINISHED THE MARK SCHEME (Finally!)
    https://docs.google.com/document/d/1...it?usp=sharing
    YOU'RE WELCOME!
    Fantastic!
    Thank you to everyone that contributed!
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    For the optical isomerism i put the right structure but did not put brackets, line in the middle and the charge of the ion how many marka out of three will i get
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    (Original post by Kat12395)
    WE HAVE FINISHED THE MARK SCHEME (Finally!)
    https://docs.google.com/document/d/1...it?usp=sharing
    YOU'RE WELCOME!
    Some edits:
    The cell potential is 2.71, not 1.71 - the values were -2.34 and 0.37
    Redox reactions:
    2I- + 2Fe3+ --> I2 + 2Fe2+
    2Al + 3I2 --> 6I- + 2Al3+
    Al + 3Fe+ --> Al3+ + 3Fe2+

    Fe3+ + 3Cl- --> FeCl3(s) - the product must have no overall charge because it is insoluble.

    Ionic equation of Al and acid: 2Al + 6H+ --> 2Al3+ + 3H2
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    (Original post by Kat12395)
    WE HAVE FINISHED THE MARK SCHEME (Finally!)
    https://docs.google.com/document/d/1...it?usp=sharing
    YOU'RE WELCOME!
    Ooh, I think I remember one of the questions that could contribute to the 5 marks!
    Was there a question after calculating delta S about calculating delta G for the reaction at 298 K?
    Thank you again for doing the mark scheme though, it's much appreciated!
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    (Original post by Kat12395)
    WE HAVE FINISHED THE MARK SCHEME (Finally!)
    https://docs.google.com/document/d/1...it?usp=sharing
    YOU'RE WELCOME!
    Thank you for all your time and help, I feel from this that I've only dropped 14 marks at a push which is great to know, is there still parts that are missing though?
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    FAILED
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    The bidentate ligand: Did it have to be the E-isomer or could it have been the Z? As in would this be acceptable? Name:  Untitled.png
Views: 83
Size:  3.7 KB
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    (Original post by Jack9909)
    The bidentate ligand: Did it have to be the E-isomer or could it have been the Z? As in would this be acceptable? Name:  Untitled.png
Views: 83
Size:  3.7 KB
    That's not only acceptable, it's correct . If I remember, it showed you the structure?
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    On the unofficial mark scheme, isn't the lattice enthalpy -3800 something?
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    (Original post by PythianLegume)
    That's not only acceptable, it's correct . If I remember, it showed you the structure?
    Just double checking as the mark scheme they made showed it differently
    I wasnt sure if there could be rotation of the C-C bond as its not a double bond
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    Have you (whoever wrote the mark scheme) included the electron configuration? Maybe I missed it in your mark scheme?

    Posted from TSR Mobile
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    (Original post by Jack9909)
    Just double checking as the mark scheme they made showed it differently
    I wasnt sure if there could be rotation of the C-C bond as its not a double bond
    Ignore me Im getting mixed up and confused with questions! Haha
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    (Original post by Amz1217)
    On the unofficial mark scheme, isn't the lattice enthalpy -3800 something?
    No, They've got the right figure, people are in agreement.


    (Original post by Jack9909)
    Just double checking as the mark scheme they made showed it differently
    I wasnt sure if there could be rotation of the C-C bond as its not a double bond
    Are you sure you're not confusing the two ligands - the one with nitrogen in it is shown as a trans isomer in the unofficial mark scheme.
 
 
 
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