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    (Original post by homefind)
    What was the Q like?


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    It was just something like, "What did JJ Thompson find out? What experiment did Rutherford and his team conduct to find that the positive charge was all in the central nucleus?" Not really exam-styled xD
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    (Original post by Cheryladair)
    Hey does anyone know any good sites for revising organic chemistry.
    fractional distillation and cracking and all that kind of stuff?
    My Chemistry teacher who teaches the organic side of the course raves about Chemguide, I don't really like it (maybe just the yellow page-ness lol) I prefer using my Nelson Thornes book

    But here it is anyway:
    http://www.chemguide.co.uk/orgmenu.html#top
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    I know this might be a simple point but does anyone get confused about when you are supposed to say "VDW Between MOLECULES" or when its supposed to be VDW between ATOMS

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    (Original post by Cheryladair)
    Hey does anyone know any good sites for revising organic chemistry.
    fractional distillation and cracking and all that kind of stuff?

    I dont know if it's any good for those but docbrown is a good website as is chemguide
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    (Original post by gooner1886)
    I know this might be a simple point but does anyone get confused about when you are supposed to say "VDW Between MOLECULES" or when its supposed to be VDW between ATOMS

    Between molecules
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    http://a-levelchemistry.co.uk/

    is an excellent website.
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    (Original post by gooner1886)
    I know this might be a simple point but does anyone get confused about when you are supposed to say "VDW Between MOLECULES" or when its supposed to be VDW between ATOMS

    I get confused between Alkanes and Alkenes sometimes so ... xD
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    (Original post by Paulineuh)
    My Chemistry teacher who teaches the organic side of the course raves about Chemguide, I don't really like it (maybe just the yellow page-ness lol) I prefer using my Nelson Thornes book

    But here it is anyway:
    http://www.chemguide.co.uk/orgmenu.html#top

    Thanks! no mention of cracking though
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    (Original post by maryamnc)
    Between molecules


    Thanks.

    Its always between molecules right? Never atoms?

    Makes sense I suppose - since it is an interMOLECULAR force (oops)

    So e.g. when you're talking about why S has a higher melting point than P- you'd say it is a bigger atom, so has stronger VDW between molecules?
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    (Original post by gooner1886)
    http://a-levelchemistry.co.uk/

    is an excellent website.

    THANKYOU! They seem to have quite a bit
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    (Original post by gooner1886)
    Thanks.

    Its always between molecules right? Never atoms?

    Makes sense I suppose - since it is an interMOLECULAR force (oops)

    So e.g. when you're talking about why S has a higher melting point than P- you'd say it is a bigger atom, so has stronger VDW between molecules?
    Yup, it's a bigger atom and has more electrons so this means stronger VDW between molecules to more energy is required to overcome this
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    (Original post by maryamnc)
    Yup, it's a bigger atom and has more electrons so this means stronger VDW between molecules to more energy is required to overcome this


    Got it.

    Thanks!!
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    What two definitions has everyone learnt for the definition of "relative atomic mass"?
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    (Original post by gooner1886)
    What two definitions has everyone learnt for the definition of "relative atomic mass"?
    The weighed average of an atom of an element relative to 1/12th the relative atomic mass of C12.

    Also, the equation:

    Average mass of one atom of an element X 12/mass of an atom of 12C
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    (Original post by a.jiwa)
    your welcome! goodluck tomorrow
    Thank you, you too
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    In questions where you are asked for the molecular formula, will they give you the 'relative molecular mass of E' in the question?

    Thanks.
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    (Original post by Stanley Winchest)
    In questions where you are asked for the molecular formula, will they give you the 'relative molecular mass of E' in the question?

    Thanks.
    yes.

    Posted from TSR Mobile
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    Thank you. I usually answer my trivial questions as I'm writing them out.
    Good luck.
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    (Original post by gooner1886)
    What two definitions has everyone learnt for the definition of "relative atomic mass"?
    Why have you learnt two ?
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    Anyone got a copy of the unit 1 Jan 2013 makscheme?

    Posted from TSR Mobile
 
 
 
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