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OCR (Salters) AS Chemistry: Unit F332 (Post exam discussion Jan 2010) watch

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    (Original post by wellynelly)
    Just curious if anybody is retaking the paper from last year. I dropped chem at AS, but i'm retaking. Silly decision, I know.

    What do you guys think will come up on the paper? What do you find the most difficult? xxx
    I'm doing exactly what your doing. ><
    http://www.thestudentroom.co.uk/show....php?t=1148548
    good luck!
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    This exam is going to kill me!
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    (Original post by kinkin)
    so guys what do you think they will ask about extract treating the public water supply
    well they didnt ask anything about that lol
    went well got 104/150 last time, this time i smashed it for sure
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    So how did everyone find it??

    I thought it was okay, however, I'm not sure about how well I did, there was loads of little questions I found hard.
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    Thought it went well
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    I found it okay i think! x
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    Was that reaction thing electrophilic addition??
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    Brilliant paper!
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    Brilliant paper!
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    (Original post by I Have No Imagination)
    Was that reaction thing electrophilic addition??
    Mechanism one? I think you could choose either electrophilic addition or nucleophilic subsitition. Was it out of 6 marks? Or am i referring to another quest?
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    i think the one between methanol and hydrogen bromide was nucleophilic subsitiution, i put eltectrphic at first but methanol doesn have any double carbon bonds so hbr isnt polarised but i dont know lol
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    (Original post by FoOtYdUdE)
    Mechanism one? I think you could choose either electrophilic addition or nucleophilic subsitition. Was it out of 6 marks? Or am i referring to another quest?
    Erm no it wasn't 6 marks. The 6 mark question was the one on the greenhouse effect, right?
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    (Original post by houseo2)
    i think the one between methanol and hydrogen bromide was nucleophilic subsitiution, i put eltectrphic at first but methanol doesn have any double carbon bonds so hbr isnt polarised but i dont know lol
    But isn't Nucleophilic Substitution when the nucleophile has a lone pair of electrons? HBr doesn't have a lone pair of electrons? I'm so confused.
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    not sure doesnt the bromine?
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    hope to atleast get 20 more marks...
    Good paper
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    (Original post by I Have No Imagination)
    But isn't Nucleophilic Substitution when the nucleophile has a lone pair of electrons? HBr doesn't have a lone pair of electrons? I'm so confused.
    It was nucleophilic substitution as the bromine has 3 pairs of lone electrons...
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    was that reaction propagation on the second page
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    (Original post by Mija_Maryy)
    It was nucleophilic substitution as the bromine has 3 pairs of lone electrons...
    Noooo :'(
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    What was the mass of the sodium ions for the advance notice questions?
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    i think id worked out moles 800/1000 x the concn which i think was 0.002 or something and then x mr of Na
 
 
 
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