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    yeah i can't figure out the last one! its not DNA. so what is it??? anymore clues on the 'weird hydrocarbon'? :confused:
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    The difference between the Carbon and the Hydrogen is 1.
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    Any other clues?
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    anyone know the silver answer :/
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    (Original post by Degreen)
    Something to do with Polycyclic Aromatic Hydrocarbons?
    It's a bicyclic hydrocarbon that is a diene, used in homoegenous catalysis.
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    (Original post by savage903)
    anyone know the silver answer :/
    What was silver; the name of the reaction?
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    i think im going along the right lines for the last one
    i dont know how to do a spioler so i will do my next paraghrapgh in white, will somebody able to tell me if im right?
    you find the density of soduim. find volume of the sphere. but i dont know why it gives you the other value for distance.... and then you just do some maths with it to get moles?
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    (Original post by chill543)
    i think im going along the right lines for the last one
    i dont know how to do a spioler so i will do my next paraghrapgh in white, will somebody able to tell me if im right?
    you find the density of soduim. find volume of the sphere. but i dont know why it gives you the other value for distance.... and then you just do some maths with it to get moles?
    You do [ SPOILER ] sidiudbusabicbas [ / SPOILER ]

    without the spaces

    Also, yes, you do do what you wrote and the answer starts with a 5, to keep you on track.
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    (Original post by loopy786)
    You do [ SPOILER ] sidiudbusabicbas [ / SPOILER ]

    without the spaces

    Also, yes, you do do what you wrote and the answer starts with a 5, to keep you on track.
    i must have been clos my answer started with 6!
    Spoiler:
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    but it was to like 5 places (e.g 10000 = 5 places) + thanks for the tip on spoilers!
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    (Original post by chill543)
    i must have been clos my answer started with 6!
    Spoiler:
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    but it was to like 5 places (e.g 10000 = 5 places) + thanks for the tip on spoilers!
    No problem

    Spoiler:
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    You might find the number 24.804 useful... just saying.
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    (Original post by chill543)
    i think im going along the right lines for the last one
    i dont know how to do a spioler so i will do my next paraghrapgh in white, will somebody able to tell me if im right?
    you find the density of soduim. find volume of the sphere. but i dont know why it gives you the other value for distance.... and then you just do some maths with it to get moles?
    Spoiler:
    Show
    Your answer probably started with a 6 because you didn't know why it gives you the other value for distance. This would be because the liquid sodium is bounded by the outer sphere AND the inner sphere and so only occupies the region between. Therefore the volume of sodium is the volume of the larger sphere minus the volume of the smaller sphere.
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    ok im back everyone and this is my working out so far. Dont cheat (even though its wrong!)

    Spoiler:
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    Density of sodium = 0.97g/CM3 = 0.0422mol/cm3 = 0.0422x10^6mol/cm3

    then vol of sphere.
    1.333piR^3 = 13 (for first) and 0.5 for second.
    diffrence is 12.5

    then 12.5*4.22*10^4= mol = 527500...

    seems a bit big, but any way its wrong :P
    corrected then for density at melting piont but i still cant see what im doing wrong.. unless its in the math.... ill look out for that number though loopy :P
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    (Original post by loopy786)
    What was silver; the name of the reaction?
    after which famous chemist is the reaction named after :/
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    no sorry its the one where it says whos the first scientist to publish synthesis of this molecule
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    (Original post by savage903)
    no sorry its the one where it says whos the first scientist to publish synthesis of this molecule
    Ohhhhh that one! Well, it's a total synthesis thing, right?

    It's a drug to treat cancer, and is harvested from pacific yew. That's an hint.
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    (Original post by chill543)
    ok im back everyone and this is my working out so far. Dont cheat (even though its wrong!)

    Spoiler:
    Show

    Density of sodium = 0.97g/CM3 = 0.0422mol/cm3 = 0.0422x10^6mol/cm3

    then vol of sphere.
    1.333piR^3 = 13 (for first) and 0.5 for second.
    diffrence is 12.5

    then 12.5*4.22*10^4= mol = 527500...

    seems a bit big, but any way its wrong :P
    corrected then for density at melting piont but i still cant see what im doing wrong.. unless its in the math.... ill look out for that number though loopy :P
    Okay it's because of how you've done some of it.

    Spoiler:
    Show


    So the difference exactly is 12.48, actually, without rounding.

    Then you make that into cm-3 which is 12480000

    12480000/ [22.8... aka molar mass/ 0.927 aka density at melting point]

    Which is 12480000/24.804 or something



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    (Original post by loopy786)
    Okay it's because of how you've done some of it.

    Spoiler:
    Show


    So the difference exactly is 12.48, actually, without rounding.

    Then you make that into cm-3 which is 12480000

    12480000/ [22.8... aka molar mass/ 0.927 aka density at melting point]

    Which is 12480000/24.804 or something



    you are a star!
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    (Original post by chill543)
    you are a star!
    No problem, good luck with the rest of it if you haven't finished already.
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    Finished
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    Been looking into the last question for ages! Seriously can't find anything to help anywhere! Someone help!! On the other hand, I've found out lots about Arecibo which I don't really care about! Haha
 
 
 
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