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Equilibria, Energetics and Elements (F325) - June 2011 Exam. watch

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    Why does the water ligand have a bond angle of 107 not 104.5?
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    im so glad i need a C in this exam to get an A overall, i dont give a **** about a* anymore after just doin that jan 2011 paper
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    (Original post by voices1)
    Why does the water ligand have a bond angle of 107 not 104.5?
    imma say because one of the lone pairs is involved in a co-ordinate bond so its pyramidal
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    (Original post by cws121)
    im so glad i need a C in this exam to get an A overall, i dont give a **** about a* anymore after just doin that jan 2011 paper
    to get the a star do you need 90+% in the A2 practical as well?
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    (Original post by voices1)
    Why does the water ligand have a bond angle of 107 not 104.5?
    In the water ligand there is 3 bonding pairs one loan pair.
    In H20 increases loan pair-loan pair repulsion leads the the bonds being pushed closer together.
    As bonding pair-loan pair repulsion is less, the bonds can move further away from each other

    I believe it is something like this not 100% though
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    (Original post by waecskt)
    to get the a star do you need 90+% in the A2 practical as well?
    you need 270/300 ums on the whole A2 course
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    (Original post by waecskt)
    to get the a star do you need 90+% in the A2 practical as well?
    yeah average of 90% in 3 A2 units, i have full ums in f326 and i got 85 in F324 so i can still get it but theres no point puttin myself under pressure
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    is rate constant also only affected by temperature and nothing else?
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    I Like:
    Transition Metals
    Born Haber Cycles
    Entropy/Enthalpy
    Redox

    I Dislike:
    Electrode Potentials
    Buffers
    Hydrogen Fuel Cells
    Remembering sh*tty f*cking colours
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    (Original post by jontylol)
    I Like:
    Transition Metals
    Born Haber Cycles
    Entropy/Enthalpy
    Redox

    I Dislike:
    Electrode Potentials
    Buffers
    Remembering sh*tty f*cking colours
    I dislike transition metal in particular ligand substitution with the colours changes, also I dislike the hydrogen-oxygen fuel cell.

    Also for shapes of complex ions how do we know which are tetrahedral and which are square planar ?
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    (Original post by CoventryCity)
    I dislike transition metal in particular ligand substitution with the colours changes, also I dislike the hydrogen-oxygen fuel cell.

    Also for shapes of complex ions how do we know which are tetrahedral and which are square planar ?
    Umm I think CuCl4 2- is tetrahedral.

    Ni(NH3)2Cl2 is square planar. Also cis-platin is square planar.

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    (Original post by CoventryCity)
    I dislike transition metal in particular ligand substitution with the colours changes, also I dislike the hydrogen-oxygen fuel cell.

    Also for shapes of complex ions how do we know which are tetrahedral and which are square planar ?
    Damnn, must add hydrogen fuel cells to dislike list! Cheers for reminding me

    I think its just a case of learning those, and we'll probably be told to "describe + explain the different shapes of complex molecules" so it'll just be a recall question. Hopefully xD

    And also;

    Does anyone have any question predictions? For essay questions?
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    (Original post by jontylol)
    Damnn, must add hydrogen fuel cells to dislike list! Cheers for reminding me

    I think its just a case of learning those, and we'll probably be told to "describe + explain the different shapes of complex molecules" so it'll just be a recall question. Hopefully xD

    And also;

    Does anyone have any question predictions? For essay questions?
    I don't see much variation for essay Qs. Won't be any energetics stuff as that is mostly calculations.

    Will probably be buffer and transition metal Q, possibly one on determining rates of order, rate equation and constant.
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    The main thing im worried about is timing regarding this exam.
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    (Original post by apo1324)
    The main thing im worried about is timing regarding this exam.
    Yea the time for the January exam was a killer
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    how would you go about doing this question guys?

    the 250 cm3 always throws me off!
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    (Original post by Pandit Bandit)
    how would you go about doing this question guys?

    the 250 cm3 always throws me off!
    0.2 x 20.15/1000=
    Using the stoichiometry of the equations we can deduce the moles of S2O3- and Cu 2+ are the same
    x10 for 250 cm3
    / 250/1000 to figure concentration
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    is a reaction feasible if deltaG (free gibbs energy) is EQUAL to 0? so its not negative or positive :s
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    (Original post by 786girl)
    is a reaction feasible if deltaG (free gibbs energy) is EQUAL to 0? so its not negative or positive :s
    -ve

    what time is the exam on!? 1:30 wednesday!?
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    (Original post by arvin_infinity)
    -ve

    what time is the exam on!? 1:30 wednesday!?
    Hey, it (in my school at least) starts at 1:00pm Wednesday. Gl for Wednesday btw.
 
 
 
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