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Cambridge Chemistry Challenge

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Applying to Uni? Let Universities come to you. Click here to get your perfect place 20-10-2014
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    The last question is so confusing >.<
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    did u finish it in the end? and are we all ready for the final quiz of the year!!
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    Done it! I may be 168th and most likely the last person but ah well! Only knew it existed about a week into may and stopped for exams for most of it
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    anyone doing this month's challenge?
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    done it
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    same - it was an easier one this month
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    I cant even do the entry question

    Im getting almost purple but cant work it out =/
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    Im stuck on the second, i feel sooo smart >.<
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    (Original post by Emissionspectra)
    I cant even do the entry question

    Im getting almost purple but cant work it out =/
    do you know what the 2 purple atoms in the structure are?
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    (Original post by CM23925)
    do you know what the 2 purple atoms in the structure are?
    I did it im on silver but have no idea what the reaction even is
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    (Original post by Emissionspectra)
    I did it im on silver but have no idea what the reaction even is
    you don't need to, search for the reaction involving those reagents
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    (Original post by CM23925)
    you don't need to, search for the reaction involving those reagents
    yeah but i thought it may help me to work out who its named after
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    (Original post by Emissionspectra)
    yeah but i thought it may help me to work out who its named after
    yeah but if you already knew what the reaction was you wouldn't need to think about the question. the point is you have to work/find out what the reaction is. and i just told you how ^
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    Can anyone give me a hint for the second?
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    (Original post by dream_merchant)
    Can anyone give me a hint for the second?
    [EtOH] = concentration of ethanol in the wine
    find the density of ethanol on the internet
    then use the equation density=mass/volume
    as 13.5% , so 135cm3 of C2H5OH in 1dm3 of wine
    and then work out the mass of the ethanol
    then finally work out the concentration!
    hope this help !
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    Done It
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    (Original post by gwengwen)
    [EtOH] = concentration of ethanol in the wine
    find the density of ethanol on the internet
    then use the equation density=mass/volume
    as 13.5% , so 135cm3 of C2H5OH in 1dm3 of wine
    and then work out the mass of the ethanol
    then finally work out the concentration!
    hope this help !
    Ahh, so your finding the concentration of ethanol.. No wonder ive been confused, been doing everything right but been finding the moles :/ Silly me

    Thanks
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    (Original post by dream_merchant)
    Ahh, so your finding the concentration of ethanol.. No wonder ive been confused, been doing everything right but been finding the moles :/ Silly me

    Thanks
    good luck!
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    (Original post by CM23925)
    do you know what the 2 purple atoms in the structure are?
    Apparently not... because the answer i put down isnt correct
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    Goooooooooooooooooooooooooooold

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