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    How did everyone find the paper? I thought both were just OK.

    Unit 4 - I got -303 Kj/mol as the Electron affinity. 0.0027 as Kp . I dont remember the values for pH.

    Unit 5 - I couldn't figure out the questions involving polymerisation and the Diazonium thingy.

    So I think the exam was quite OK..
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    unit 4 was dodgy ...2 much periodicity crap...nto enuf organic
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    i got 0.039 sumfin for kp. did u find unit 4 or 5 easier
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    I got -250KjMol-1 for Iodine.......
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    I think I got -303 kJmol-1 for the Born-Haber Cycle too.

    Can't remember the Kp.

    pH of 4.9 or something for the buffer, 2.something for just the acid.

    I didn't think either paper was too bad. I was so terribly hot, I felt really bad at the start of unit 4. Seeing all the periodicity stuff for the first question didn't help. I was feeling awful and panic-y. I asked for a drink of water, went on to the next questions, and thankfully calmed down. I also went back and think I managed most of the periodicity questions (though I am unsure about why the silicon dioxide doesn't react). Just hoping I didn't make lots of careless errors as I was so bad at the start.

    The exams were a bit annoying in parts though. The Born Haber Cycle was very unclear, if it there was a question where it asked us to draw a Born Haber Cycle, we would have probably got 0 marks if we drew that!

    The Equilibrium questions were both quite easy though.

    Unit 5, again some odd parts, but not amazingly bad, probably the harder one though. I too forgot conditions for azo dye, so I just put under 5 degress C for both (got to be right for one). The free radical mechanism wasn't something we really covered in much detail, but hopefully the marking will be lenient, as I think there are quite a lot of possible propagation steps. I started with the H bonding to the RO radical, making the C a radical, now wondering if I should have removed the double bond first.

    Finally (sorry the post has been so long?!) anyone find it a bit odd they asked about the oxidation of alcohols in both papers?
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    (Original post by mr_shoe_uk)
    I think I got -303 kJmol-1 for the Born-Haber Cycle too.

    Can't remember the Kp.

    pH of 4.9 or something for the buffer, 2.something for just the acid.

    I didn't think either paper was too bad. I was so terribly hot, I felt really bad at the start of unit 4. Seeing all the periodicity stuff for the first question didn't help. I was feeling awful and panic-y. I asked for a drink of water, went on to the next questions, and thankfully calmed down. I also went back and think I managed most of the periodicity questions (though I am unsure about why the silicon dioxide doesn't react). Just hoping I didn't make lots of careless errors as I was so bad at the start.

    The exams were a bit annoying in parts though. The Born Haber Cycle was very unclear, if it there was a question where it asked us to draw a Born Haber Cycle, we would have probably got 0 marks if we drew that!

    The Equilibrium questions were both quite easy though.

    Unit 5, again some odd parts, but not amazingly bad, probably the harder one though. I too forgot conditions for azo dye, so I just put under 5 degress C for both (got to be right for one). The free radical mechanism wasn't something we really covered in much detail, but hopefully the marking will be lenient, as I think there are quite a lot of possible propagation steps. I started with the H bonding to the RO radical, making the C a radical, now wondering if I should have removed the double bond first.

    Finally (sorry the post has been so long?!) anyone find it a bit odd they asked about the oxidation of alcohols in both papers?

    All my answers were the same as those. Huzzah.

    I'm just worrying about whether i'll have managed the A boundary... I agree the SiO2 was a bit tough, and it's dubious as to whether i hit the mark points on some of my answers... *crosses fingers*
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    I also got -303 for EA and 0.039 for Ka.
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    fairieboi, are those your university offers in your signature?

    I'm hoping I made the A boundary too, as my Cambridge offer. is pretty tough (and I unfortunately don't know if I made the A in maths, due to me finding P3 and M2 so hard).

    I couldn't think of an iron catalyst either..
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    (Original post by mr_shoe_uk)
    fairieboi, are those your university offers in your signature?

    I'm hoping I made the A boundary too, as my Cambridge offer. is pretty tough (and I unfortunately don't know if I made the A in maths, due to me finding P3 and M2 so hard).

    I couldn't think of an iron catalyst either..
    yeah they are...
    I reckon i'll have got As in latin and greek, but i need one in either bio or chem... bio is hard to judge, and chem was... hm. it could go either way for chem i guess...
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    what did you get for the unit 4 indicator question? and why is Al(aq) acidic?
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    (Original post by becksdecks7)
    what did you get for the unit 4 indicator question? and why is Al(aq) acidic?
    i said it would be more than 7 end point and indicator phenylphthalein
    Al3+ has its hexaqua water molecules deprotonated to make H+
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    phenolphthalein , more than 7.
    What about pH for buffer solution?
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    yeh I did that indicator question as well and got that phew damn cant believe how I got -250 lost 2 marks DAMN
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    i got those same answers, i think i did ok, but i still found both papers mucccchh harder and reallly weird, compared to all the past papers i did, (and i did a loooott of past papers)...Stupid edexcel, tht born haber diagram was soo rubbish, and the question was soo vagues... also the question on unit 5 about the the 2 spectra, who vague could you get!!
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    Yeah, I said more than 7 and phenolpthalein too.

    Wasn't sure about the Aluminium one, the equation I wrote was a bit unit 5. I didn't write it all the way to precipate either:

    [Al(H2O)6]3+ + H2O = [Al(H2O)5(OH)]2+ + H30+

    was what I wrote. I think I should be ok to get the marks, at least I'm hoping so.

    Fairieboi, was your biology edexcel too? Is there a thread about unit 3 and 5 in that too? (sorry, I'm new here).
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    found it pretty crap i'm worried i won't scrape my B though hopefully i'll have booted AS to an A with retakes. The Born Haber cycle really confused me well not confused just put me off because i'm used to drawing it myself and thinking through the steps. I think i made a calculation error too . Made up quite a lot of stuff for the last question in unit 5. oh well too late to change anything now and i've got while off to revise for the synoptic
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    I got
    EA1 = -303.5 kJ/mol
    Kp = 0.0394
    pH = 2.81
    pH(buffer) = 4.61
    and
    k = 0.001 mol^-1dm^3s^-1(rate constant)
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    (Original post by mr_shoe_uk)
    Yeah, I said more than 7 and phenolpthalein too.

    Wasn't sure about the Aluminium one, the equation I wrote was a bit unit 5. I didn't write it all the way to precipate either:

    [Al(H2O)6]3+ + H2O = [Al(H2O)5(OH)]2+ + H30+

    was what I wrote. I think I should be ok to get the marks, at least I'm hoping so.

    Fairieboi, was your biology edexcel too? Is there a thread about unit 3 and 5 in that too? (sorry, I'm new here).
    nope. my bio is aqa a. check out the biology forum, there might be one around
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    Sounds similar. Nobody else thought it was odd having the same reaction (oxidising alcohols) twice?
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    yeah i thought that was slightly odd...and didn't we need to reduce twice too?
 
 
 
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