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    (Original post by shooting_stars)
    They asked for silicate (which means it has oxygen) not silicon ion.. I did the same mistake
    Oh dear
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    -196?
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    (Original post by shooting_stars)
    That's the same thing I did... I didnt realise they asked for silicate not slicon one
    Great, that's already like 10 marks down the drain. There goes my A

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    (Original post by DominoMatrix227)
    Who else got 278 for the volume of the gas?
    Me!
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    (Original post by shooting_stars)
    They asked for silicate (which means it has oxygen) not silicon ion.. I did the same mistake
    Yep. It asked for silicate. Don't worry plenty of people made that mistake as well.
    (SiO3)2- is probably the right answer. Messed it up and only realised after.
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    Can we get an Unofficial Mark scheme going?
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    (Original post by HecTic_H)
    Can we get an Unofficial Mark scheme going?
    Yes please.

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    yeah no deff got the last one wrong... dropped a few marks for sure

    not to sure about the Hr decomposition enthalpy question!
    any help?
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    Question 2 enthalpy calculation? What did you guys get?
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    (Original post by Kichelle)
    Question 2 enthalpy calculation? What did you guys get?
    +196

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    -196 or +196 for enthalpy change question?
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    (Original post by Eddyamz)
    -196 or +196 for enthalpy change question?
    + because it was formation, had to redo that question many times

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    (Original post by Eddyamz)
    -196 or +196 for enthalpy change question?
    i got -196 because it was +376-572= -196
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    (Original post by TheGreatImposter)
    + because it was formation, had to redo that question many times

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    It was decomposition of hydrogen peroxide, not formation


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    (Original post by TheGreatImposter)
    + because it was formation, had to redo that question many times

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    But i have seen questions where formation is exothermic sometimes.. I drew the Hess's cycle and both were minus values but then the first value you had to change it to a + because you had the change the arrow to make the Hess's cycle work..
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    For the electron energy question (5 marks), my answer was:

    Energy lost as electrons drop from higher to lower energy levels
    E = hv
    This gives a specific line
    Energy gaps specific for each element
    Diagram.

    Did anyone else get these points?
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    (Original post by DominoMatrix227)
    For the electron energy question (5 marks), my answer was:

    Energy lost as electrons drop from higher to lower energy levels
    E = hv
    This gives a specific line
    Energy gaps specific for each element
    Diagram.

    Did anyone else get these points?
    Did the exact same
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    (Original post by shooting_stars)
    But i have seen questions where formation is exothermic sometimes.. I drew the Hess's cycle and both were minus values but then the first value you had to change it to a + because you had the change the arrow to make the Hess's cycle work..
    But part 2 confirmed that the reaction produced heat so it had to be exothermic, so I put my value as negative (can't remember what it was)
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    I put 109 for the bond angle, but did it ask for the expected or actual bond angle?
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    Was the actual bond angle greater or smaller than the predicted?
 
 
 
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