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    I think I did well enough in this exam. Not bad at all.
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    (Original post by scarlet ibis)
    yeah i thought that
    i was like, where are the 6 marks in this?
    at least now i have a chance of getting an overall A
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    yeah same. i really need an A!
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    (Original post by emporium)
    wow someone did question 4 hehe, congratulations you must be one of about 3 in the country
    Weird isn't it: everyone at my college did 4, very few did 2. Probably, it depends on the teachers.

    I got 4.something for the ozone, probably it's me that's wrong
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    Nobody in my school was able to to that calculation in the first question. It seems all of you guys could do it! Is there like a set method for it that we just wern't taught? I somehow got x=3! Just wondering if anyone could show me???
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    Even at my school.... most ppl did 4..... ozone answer was

    H---c=c----H
    _ _H/ \c2h5

    quite a few did 2... said they found it easy.....
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    method for tthe first calculation:

    you got AgCl as a ppt, that other huge compound had 3 Cl's in it therefore the ratio was 1:3

    you find moles of AgCl

    divide 3 to get moles of that huge compound

    then do mass over males to get the Molar mass which was 277.5
    then minus the Relative atomic mass of K and Cl and Mg and all that crap, leaving just the xh20

    that equals 108 left and cos h20 is 18 you do 108 divided by 18, giving 6
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    oh god so did not do that, but I get how you got there!
    DAMN!!!!!!! How FRUSTRATING???
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    (Original post by ravs)
    method for tthe first calculation:

    you got AgCl as a ppt, that other huge compound had 3 Cl's in it therefore the ratio was 1:3

    you find moles of AgCl

    divide 3 to get moles of that huge compound

    then do mass over moles to get the Molar mass which was 277.5
    then minus the Relative atomic mass of K and Cl and Mg and all that crap, leaving just the xh20

    that equals 108 left and cos h20 is 18 you do 108 divided by 18, giving 6
    Thanks for showing the method. It makes sense. I'd never seen one of those questions before and stupidly got x=0.12!!! So I will have lost loads of marks (got the no of moles of AgCl so hopefully one mark!), but think I did ok on the rest of the stuff. I did Q2,3 as did most ppl at my school. I tried Q4 as had time left, and they do give you the 2highest marks from the 3questions, but I gave up as didnt like it!

    Oh well, can't change the past now, and I'm still feeling quite confident, so hopefully I will have got my A. If not, then I can still get my A in biology and hopefully meet my Uni offer! Just glad it's all over...
 
 
 
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