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    polarised when applied to a cl- ion: electron cloud around Cl- distorted?

    NH2- V-shaped 2 lone pairs?
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    the difference in EN decreases therefore less polar
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    yeah, i agree that all the textbooks say about hcl, is prevention of unwanted precipitates. I revised that section inside out, its a shame that the couldn't have asked the kinda questions they had done in previous papers on solubility.


    oooh and on the syllabus, we need to know about solubility of hydroxides and sulphates.. nothing about carbonates! well thats wat i can infer from the textbook
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    all the past papers were almost exactly the same as eachother

    this one was a complete anomaly
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    From what I know HCl is added to prevent the formation of BaSO3 which is also a white precipitate. I also know I was just fobbled by the question lol since I even started to write the equation Na2SO4 but I don't know why I just stopped and... :P
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    (Original post by theultimate)
    all the past papers were almost exactly the same as eachother

    this one was a complete anomaly
    Heh. You should know by now in chemistry that whenever there is a rule for anything, there is always an exception.
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    yes! i thort so.. thanx for the reassurance 'the ultimate'.

    the nh2 q... yes it was v shaped, although distorted tetrahedral would be accepted - thats wat i wrote.
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    So are you trying to insinuate the summer one will be back in line hence easier hence a little less complex lol.
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    i dont think distorted tetrahedral would be accepted

    i saw a previous mark scheme and only V shaped or bent were allowed

    because the BONDS do not make a distorted tetrahedral shape, even my teacher told me
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    Crap I wrote bent for the NH2- is that wrong?
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    yes, this was an anomaly. even with my maths paper yesterday there was an odd structure of questions. Why does it have to happen when its our turn to take the exam! This chem paper was more knowledge than application of knowledge
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    what was the answer to : EXPLAIN how they are detected (on one line)
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    (Original post by Lamba)
    Crap I wrote bent for the NH2- is that wrong?

    yep that is acceptable
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    bent is right.. theres loads of words to describe the shape. A revision guide wrote bent... however our teacher discourages it
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    i wrote distorted linear - don;t suppose that will merit a mark...was rushing and couldn't think..
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    (Original post by theultimate)
    what was the answer to : EXPLAIN how they are detected (on one line)
    something about a current being produced when the ions reach a detector.
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    what was the answer to : EXPLAIN how they are detected (on one line)
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    oooh about the detection 1, i wrote that the no. of electrons released when ions hit the detector is parallel to m/z ratio.. is that alrite?

    other people wrote it was simply that a current was produced at the detector

    itll be a shame if i mess this up.. i love chemistry and revised thoroughly for it
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    I wrote 'bent' too They usually accept bent on the mark schemes.
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    (Original post by Sahds)
    oooh about the detection 1, i wrote that the no. of electrons released when ions hit the detector is parallel to m/z ratio.. is that alrite?

    other people wrote it was simply that a current was produced at the detector

    itll be a shame if i mess this up.. i love chemistry and revised thoroughly for it

    lol proportional not parallel
 
 
 

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