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    What an absolute beautiful paper! only thing I feel like I messed up on was redox alkali half equations and the effect of pressure. Which was five marks altogether, though I may stil have got a few. Talked to A* kid in my class and got the same results as him for most calculations and got 94. Something % for impurity thing. i will be surprised if I don't get an A*. This paper has certainly made up for the horrendous unit 4 paper
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    I got 94.4% purity and ticked hno3 kms
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    Does the pressure have an effect on the emf? I said the emf increases eqbrm shift blah blah, but wasn't sure on that
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    I got something like -197 for enthalpy change and -182? Or something for entropy cant remember 100%
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    (Original post by berries366)
    I got something like -197 for enthalpy change and -182? Or something for entropy cant remember 100%
    Think I got -196 for enthalpy
    and -189 for entropy
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    Hi I have some questions and answers if anyone wants to add to it?

    Lattice dissociation of K2O being less endothermic than Na2O:

    K+ ions are bigger than Na+ ions
    Weaker electrostatic force of attraction between K+ and O2- ions/weaker ionic bonding
    Less energy needed to break the ionic lattice

    Solubility of MgCl2 decreases
    Forward reaction is exothermic
    Equilibrium shifts left to oppose increase in temperature

    Enthalpy of solution = -155 kJ/mol
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    (Original post by Number Nine)
    I got 94.4% purity and ticked hno3 kms
    I think it was h2so4, that's what I put
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    What did people get in the percebtage purity question? Anyone get around 50% ish?
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    Did anyone else pick sulphur for X?
    I'm such an idiot 😂😂😭

    Still such an easy paper I'm so happy
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    How many marks would i lose for getting 50% not 94%? I forgot to times c2o4 moles by 3..
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    (Original post by berries366)
    I got something like -197 for enthalpy change and -182? Or something for entropy cant remember 100%
    (Original post by thehollowcrown)
    Think I got -196 for enthalpy
    and -189 for entropy
    It wanted standard enthalpy change, hence you do it for one mole hence you divide answers by 2 I believe (that's what happened on a previous mark scheme)
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    (Original post by cowie)
    I thought hydrogen oxygen cell was my reversible and hence lie chateliers principle wouldn't have any effect?


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    What are you talking about
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    (Original post by thehollowcrown)
    Think I got -196 for enthalpy
    and -189 for entropy
    Yeah think thats what i got lol cant remember 😆
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    (Original post by Hannahbram)
    How many marks would i lose for getting 50% not 94%? I forgot to times c2o4 moles by 3..
    You'd still get most of them, normally those questions are around 5 marks but this one was 7 because it had the extra step so maybe you lost like 2?
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    (Original post by Hannahbram)
    How many marks would i lose for getting 50% not 94%? I forgot to times c2o4 moles by 3..
    You divide c204 moles by 3
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    that test man fhuuuuck
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    (Original post by Suits101)
    It wanted standard enthalpy change, hence you do it for one mole hence you divide answers by 2 I believe.
    ohh really??
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    (Original post by ManOfJustTin)
    Did anyone else pick sulphur for X?
    I'm such an idiot 😂😂😭

    Still such an easy paper I'm so happy
    Was X the one that formed an acid? If so I did S too
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    Was the ratio 2:5??
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    (Original post by Suits101)
    It wanted standard enthalpy change, hence you do it for one mole hence you divide answers by 2 I believe.
    I remember thinking that and was unsure about whether to divide, so I just left it undivided and did the calculation that way
 
 
 
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