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    (Original post by Dim0nIX)
    Yep. Solid - liquid Entropy increases. Energy is needed to break the bonds in the lattice (ice) so energy needs to be put in so delta H is +
    Thanks. Thought so
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    (Original post by jontylol)
    Really?! I may have a chance at the A* yet!
    jan 2011 had 65/100 for an A with 7/8 mark increments so presumably that meant 73 for an 90% ums. if this paper is so much harder than jan 2011 like everyone says it is then it might even be slightly lower.
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    That paper was truly insane.
    Why on earth would they include a question on sweets? The Battery question threw me as well. The rest was relatively okay.
    Am I right in assuming that any acid would get you the mark for that Buffer question, along with any valid concentrations as the paper gave you no guidance?
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    not looking forward to results day....
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    I need a low B to get an A overall, what do you guys think will be the grade boudanry for a B? Does 57-60 for a B sound fair?
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    please please can someone help me!!
    what was the answer to the KOH electrolyte question??
    where we were given two pka values and we had to write equations??
    what did everyone put?!
    xx
    major rep for life!
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    + REP anyone?
    i've had nothing at all to do tonight haha.

    questions, marks, and the answers. (some of them are just my attempt at it, e.g. the decomposition of KOH, and i'm also not 100% about the marks for each question but i've made it =100 so 1 question maybe +/- 1mark than its actually worth)

    http://www.mediafire.com/?g779xf52up4b79p
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    Was anyone's initial rate 4.44x10-5 and k 4.44x10-3 ??
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    On the bipy one, I'm fairly sure that the N atoms were on opposite sides of the ring to the C-C bond...

    I got stuck on Q1
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    (Original post by *QueenBeee)
    please please can someone help me!!
    what was the answer to the KOH electrolyte question??
    where we were given two pka values and we had to write equations??
    what did everyone put?!
    xx
    major rep for life!
    I think with the 2 pKa values they gave you...you had to write the equation that dissociated both the H+ ions i.e -OOCCOO- next to the lower pKa value and write the equation that dissociated one of the H+ ions i.e HOOCCOO- next to the higher pKa value.
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    would i get a few marks for putting lactic acid and writing out the equations for salt and conjugate base?

    also what did people put for the koh question?

    i put

    2KOH + 2e- -----> H2 + 2KO

    also strength of acid : extend of dissociation of h+ ions and i put down equations!
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    (Original post by sc0307)
    Was anyone's initial rate 4.44x10-5 and k 4.44x10-3 ??
    mine mate!!!
    It did exactly like it is shown on the edexcel book.

    Initial rate = 0.01/(+ or - 225)

    we are prob right
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    (Original post by RodrigoB)
    mine mate!!!
    It did exactly like it is shown on the edexcel book.

    Initial rate = 0.01/(+ or - 225)

    we are prob right
    Yay!!!!!!! I worked out mine differently cos I made my tangent slightly smaller (0.01-0.006/90-0) but at least our answers are the same and hopefully right :-D
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    (Original post by sc0307)
    Yay!!!!!!! I worked out mine differently cos I made my tangent slightly smaller (0.01-0.006/90-0) but at least our answers are the same and hopefully right :-D
    there will be a range between what they accept. i had (0.01-0.0065)/100 so my answer for initial rate was 3.5x10^-5
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    (Original post by wilsea05)
    + REP anyone?
    i've had nothing at all to do tonight haha.

    questions, marks, and the answers. (some of them are just my attempt at it, e.g. the decomposition of KOH, and i'm also not 100% about the marks for each question but i've made it =100 so 1 question maybe +/- 1mark than its actually worth)

    http://www.mediafire.com/?g779xf52up4b79p
    Are you sure the mark allocations are correct for the rate constant question
    and the boxer ticker on entropy?
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    (Original post by wilsea05)
    there will be a range between what they accept. i had (0.01-0.0065)/100 so my answer for initial rate was 3.5x10^-5

    (Original post by sc0307)
    Yay!!!!!!! I worked out mine differently cos I made my tangent slightly smaller (0.01-0.006/90-0) but at least our answers are the same and hopefully right :-D
    I got mine as 4.0 x 10^-3
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    (Original post by Masderchef)
    Are you sure the mark allocations are correct for the rate constant question
    and the boxer ticker on entropy?
    like i said, might be a few marks that aren't accurate as they were cut out of the photos taken
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    i think there were only 2 marks given for the tick the box q on entropy
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    what do you think the grade boundary will be for an A?

    around 65 / 70?

    i hope its similar to jan ..
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    (Original post by sportycricketer)
    I got mine as 4.0 x 10^-3
    for ur k?
 
 
 
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