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Edexcel A2 Chemistry Exams -6CH04 (14th June) and 6CH05 (22nd June) Discussion Thread watch

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    (Original post by ChemIsTry_harder)
    Attachment 553834
    Hi guys... Can anyone explain to me how can you solve this????
    The answer is A btw.
    C0balt can explain it to you !
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    (Original post by Don Pedro K.)
    Lemme guess...this is from an IAL paper.
    No actually, that's the hard truth

    It's from June 2014/01
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    (Original post by C0balt)
    Thats UK 2014
    Crap.
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    (Original post by PlayerBB)
    No actually, that's the hard truth

    It's from June 2014/01
    I haven't done this one yet, doing it tomorrow :s sorry!
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    (Original post by ChemIsTry_harder)
    Attachment 553834
    Hi guys... Can anyone explain to me how can you solve this????
    The answer is A btw.
    The gas contracted because 20cm3 of H2O was condensed down as it was at room temperature. 10 of hydrocarbon therefore produces 20cm of water. Water has 2 H atoms per molecule, so from the hydrocarbon:water ratio you know that a mole of the hydrocarbon will have 4 moles of H atoms
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    (Original post by Don Pedro K.)
    I haven't done this one yet, doing it tomorrow :s sorry!
    That's okay!
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    (Original post by PlayerBB)
    That's okay!
    How was the paper overall?
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    (Original post by Don Pedro K.)
    C0balt can explain it to you !
    Thanks!
    (Original post by C0balt)
    The gas contracted because 20cm3 of H2O was condensed down as it was at room temperature. 10 of hydrocarbon therefore produces 20cm of water. Water has 2 H atoms per molecule, so from the hydrocarbon:water ratio you know that a mole of the hydrocarbon will have 4 moles of H atoms
    thank you for the detailed explanation !!! Really appreciate it!
    I've been trying to solve this for so long lol
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    (Original post by ChemIsTry_harder)
    Thanks!


    thank you for the detailed explanation !!! Really appreciate it!
    I've been trying to solve this for so long lol
    Np, I found it difficult initially too
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    (Original post by Don Pedro K.)
    How was the paper overall?
    It was generally good, some hard bits, I liked the multiple choice though!!

    Those hard bits are marks that can be obtained if you think thoroughly, however, I never got what that question that I sent really mean!
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    I really hope the paper is like the Jan 2016 IAL. Tricky but not too bad and Grade boundaries were so much lower than I expected. Just have June 2015 IAL to go, saving that for tomorrow
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    I'm getting a little confused rounding up molar ratio...

    Molar ratio
    C : H : O
    2.1 : 5.8 : 1
    2 or 3? : 6 : 1

    and another question...

    When do we multiply
    like eg.
    C : H
    0.1 : 0.2
    1 : 2 and not 1 : 1?
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    (Original post by ihaspotato)
    I'm getting a little confused rounding up molar ratio...

    Molar ratio
    C : H : O
    2.1 : 5.8 : 1
    2 or 3? : 6 : 1

    and another question...

    When do we multiply
    like eg.
    C : H
    0.1 : 0.2
    1 : 2 and not 1 : 1?
    To calculate the ratios divide each number by the smallest number.
    2.1/1 = 2.1 = 2
    5.8/1 = 5.8 = 6
    1/1 = 1 = 1
    = C2H60
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    (Original post by Blazyy)
    To calculate the ratios divide each number by the smallest number.
    2.1/1 = 2.1 = 2
    5.8/1 = 5.8 = 6
    1/1 = 1 = 1
    = C2H60
    2.1, 5.8, 1 are the mole ratios that I got.... dividing the moles of C/H/O with the smallest mole was the previous step that I already did to get 2.1,5.8 and 1. Now what?
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    (Original post by ihaspotato)
    2.1, 5.8, 1 are the mole ratios that I got.... dividing the moles of C/H/O with the smallest mole was the previous step that I already did to get 2.1,5.8 and 1. Now what?
    The numbers you got equal the number of moles in the empirical formula.
    They are not whole numbers, so you need to round them off to 2, 6 and 1 which gives C2H60
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    (Original post by Blazyy)
    The numbers you got equal the number of moles in the empirical formula.
    They are not whole numbers, so you need to round them off to 2, 6 and 1 which gives C2H60
    Thanks! and when do we multiply? like I have solved questions where..

    C : H
    0.1 : 0.2
    becomes
    1 : 2 <-- ?

    I never really understood at what situation I am supposed to do this.
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    I have a Bromoalkane and a Benzene I want to make them react in the presence of a halogen carrier...

    What is the halogen carrier?

    AlCl3 or AlBr3?
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    could anyone answer these questions for me ? please x

    why does benzene not decolourise bromine water, but phenol does?

    the reaction of the formation of a salt between methylamine and sulphuric acid?

    Why does benzene burn with a 'smokey' flame ?

    finally, could anyone write the formation of the electrophille for the fuming sulphuric acid reaction ? ( i know it is not in our specification to know the formation of this particular electrophille, but from having done unit 4 chem and bio, its clear that EDEXCEL dont really know there spec well)
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    Name:  Screen Shot 2016-06-21 at 12.18.50.png
Views: 136
Size:  55.5 KB

    hi, could someone explain why this is C. I thought a negative delta S total means that Kp would also be negative?
    thanks
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    Name:  some chem question.png
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Size:  38.5 KB

    How would you go about this question? I'm guessing the increase is due to ppt being made and the decrease is due to ppt dissolving. How would you find the formula??

    Thanks
 
 
 
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