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    i thought it was okay but last years one was easier
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    Anyone know where the grade boundaries go?
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    well it was 50/75 to get a last year
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    (Original post by Asian cutie)
    well it was 50/75 to get a last year
    50?
    really?
    phew. I was worrying after i thought i'd dropped 10 or so marks... heh
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    schweeet
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    (Original post by Asian cutie)
    well it was 50/75 to get a last year
    thats IT? :O....well..yay!
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    thats blatently gonna b higher tho...
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    (Original post by mackin boi)
    thats blatently gonna b higher tho...

    hmm.....more than what I need anyway
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    (Original post by Mathemagician)
    it was acidified potassium dichromate
    how could it have been that when that wasn't even involved in the reaction? Iodine is reduced to I-, so it must have been that? Or not?

    Unit 4:
    I got also got -303.5 for ea...and 0.003 something for the kp question...
    Why doesnt SiO2 react with water? is it because of the giant atomic lattice?
    Why is dissociation only 2kjmol different? is it because OH- takes away H+ and therefore encourages dissociation?
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    for last q
    i drew sodium phenate
    i drew 2 4 6 tribromophenol
    i drew phenylethanoate
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    what did you guys put for the optical isomer question?
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    (Original post by Toffee)
    how could it have been that when that wasn't even involved in the reaction? Iodine is reduced to I-, so it must have been that? Or not?
    the question asked for the conversion of A to B (or the otherway around)
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    (Original post by Asian cutie)
    well it was 50/75 to get a last year
    I did the June 2004 papers as a mock and everyone in my class got D's E's and U's. One person got a C... those papers was ridiculously hard. completely different league to the ones this year.

    (Original post by Mathemagician)
    the question asked for the conversion of A to B (or the otherway around)
    i was thrown on that first. but yeah B oxidises to give A, so A is reduced. you could tell because of the O-H peak on B and the C=O peak on A... i think well thats what i put!

    all in all though, except from the propagation question and a couple of the reactions, both papers went pretty good for me. I was so surprised.
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    i had to draw that propogation out like 3 times...ran out of space and put it on 'additional paper'
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    (Original post by Mathemagician)
    the question asked for the conversion of A to B (or the otherway around)
    i was almost sure that when it asked us to specify the oxidising agent it was referring to the iodoform....it was right underneath the info about the iodoform...

    I hope i didn't misread all the questions!
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    (Original post by mackin boi)
    i had to draw that propogation out like 3 times...ran out of space and put it on 'additional paper'
    same as me .
    I draw it below the 1b)i) question cuz I still got a space there. Is it ok?
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    damn ... I read ...triiodomethane contains Iodine ... my thought was I2 molecule
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    This paper is damn hard.... much harder than past papers
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    ive jus been busy calculating the values and it seems as if its normally around 56, and 53 for unit 4 and 5 respectivly.
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    The reason Si02 cant dissolve is thje fact that strong covalent bonds in qa repeating giant covalent structure must be broken for this to occur. The activation energy for this is phenomenally high so insufficient energy is available
 
 
 
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