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    Basically, what will I need to know on these specific unit 5 areas (becasue the specification is very unspecific):

    a) potassium manganate titrations in the first topic

    b) organic applications (I have never seen this asked in a past paper!)

    c) ways of measuring the rate of a reaction, quite ambiguous in my notes

    thanks for any help here
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    Potassium manganate - you just need to know the general method and it's used for estimating the conc of a reducing agent. And be able to do calculations based on it

    Organic applications I think refers to commercial uses. Things like polymers, fertilisers, drugs etc.

    Rates of reaction. Usually one of

    a. Measuring volume of gas produced
    b. If an acid/alkali is produced, remove a sample, stop the reaction and titrate with standard alkali/acid
    c. If Iodine produced, titrate with sodium thiosulphate
    c. Colour change. Can be used with iodine again (brown colour)
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    okay thanks. Have you done a lot for organic applications? we didn't do any in class and something tells me, with my luck, it's gonna be on the paper tomorrow. But it hasnt come up yet.

    I just know that groups such as -OH, -C=O, NH2 are water soluble so have a short retention time but are relased into the blood very fast, and fat soluble groups such as long alkyl chains have a long retention time..

    then fertilisers like NH4+ and NO3- are fast at delivering nitrogen but this might cause too much growth and urea is slower releasing.

    thats about it... (Im just typing it up to check I remember some of it)

    Need to work on the rest though, like polymers and fats/soaps?
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    cud u xplain visible and uv spectra 2 me bcos i was going thru spec and i havent dun it b4
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    (Original post by mik1w)
    okay thanks. Have you done a lot for organic applications? we didn't do any in class and something tells me, with my luck, it's gonna be on the paper tomorrow. But it hasnt come up yet.

    I just know that groups such as -OH, -C=O, NH2 are water soluble so have a short retention time but are relased into the blood very fast, and fat soluble groups such as long alkyl chains have a long retention time..

    then fertilisers like NH4+ and NO3- are fast at delivering nitrogen but this might cause too much growth and urea is slower releasing.

    thats about it... (Im just typing it up to check I remember some of it)

    Need to work on the rest though, like polymers and fats/soaps?
    Nope we didnt do anything at college, I assume it's the sort of thing they expect you to read up on yourself! Not sure how much they want though to be honest and yup, have a gut feeling it'll be there tommorow!
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    I'm gonna cram it tomorrow morning I think, work like mad. I still ahve a couple papers to go through. Did jan04 today and got 53/75, which was dissapointing but I did make some schoolboy errors, eg. forgot to put square brackets round the complex ion diagram. Also I think they want "ethoxyethane" instead of ether from the markscheme which is a bit strange.
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    yea ...i read some mark schemes with ethoxy ethate..but then sum with ether...im going for the long 1 2 b sure
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    (Original post by mik1w)
    I'm gonna cram it tomorrow morning I think, work like mad. I still ahve a couple papers to go through. Did jan04 today and got 53/75, which was dissapointing but I did make some schoolboy errors, eg. forgot to put square brackets round the complex ion diagram. Also I think they want "ethoxyethane" instead of ether from the markscheme which is a bit strange.
    I think its ethoxyethane or DRY ether. I've always used dry ether though.
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    Yea "dry" gets its own mark on the one I did today so good to remember that.
 
 
 
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