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    (Original post by wilsea05)
    + REP anyone?
    i've had nothing at all to do tonight haha.

    questions, marks, and the answers. (some of them are just my attempt at it, e.g. the decomposition of KOH, and i'm also not 100% about the marks for each question but i've made it =100 so 1 question maybe +/- 1mark than its actually worth)

    http://www.mediafire.com/?g779xf52up4b79p
    for the 3d polymer Question, if it wants one repeat unit, would it just be one nickel complex ion/ligand thingy and the 4,4 bidy group, not two ligands and a 4,4bidy group thing? Just outta interest?!
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    (Original post by bambinooo)
    would i get a few marks for putting lactic acid and writing out the equations for salt and conjugate base?

    also what did people put for the koh question?

    i put

    2KOH + 2e- -----> H2 + 2KO

    also strength of acid : extend of dissociation of h+ ions and i put down equations!
    someone please answer its bugging me
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    (Original post by bambinooo)
    someone please answer its bugging me
    i put that equation for it too, along with 2KOH +2e -> O2 + 2KH cus it asked for the equations at each electrode, and one produced O2 and one produced H2.

    and yeah strength of acid - ability to donate or lose H+ is what i put
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    i ignored K because I thought that it was a spectator ion
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    all of this is pointless if neither of you lot have sent an email. 3 in my area have .. so come on people !! already know around 40 people that sent it. Imagine being OCR and receiving 40 emails with a subject "CHEM F325... ect
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    (Original post by sc0307)
    for ur k?
    cant remember exactly but something like 4 x 10^-5
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    (Original post by Bullit)
    Discuss how hard you found it, fair enough. Write complaints to the exam board complaining how it is poorly made and had questions impossible to answer? No. If you did **** in the exam face the facts and accept that it is you own fault, not the exam boards fault for giving you questions beyond your own ability.
    Up my own arse? Grow up. I never said the test was easy, all I said was for people to stop complaining to OCR because it ruins the efforts of people trying to get something done about the Biology paper, which was written unfairly.
    I then recieve replies from people like you posting insults because you can't handle it. At the end of the day, people will recieve the grade they deserve in this exam. Cry me a river.
    I didn't even find the exam that bad, your comment just made you sound like a ****
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    (Original post by sc0307)
    Yay!!!!!!! I worked out mine differently cos I made my tangent slightly smaller (0.01-0.006/90-0) but at least our answers are the same and hopefully right :-D
    your tangent was pretty smaller compared to mine then
    but we still got the same answer LOL WEIRD
    HIGH FIVE! ON THE 8 MARKER ?
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    (Original post by JakeChocz)
    I didn't even find the exam that bad, your comment just made you sound like a ****
    How about you read the context of my comment and what comment it was in reply to rather than trying to act like the big man.
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    (Original post by wilsea05)
    + REP anyone?
    i've had nothing at all to do tonight haha.

    questions, marks, and the answers. (some of them are just my attempt at it, e.g. the decomposition of KOH, and i'm also not 100% about the marks for each question but i've made it =100 so 1 question maybe +/- 1mark than its actually worth)

    http://www.mediafire.com/?g779xf52up4b79p
    When calculating the enthalpy change of hydration wouldn't it be the -lattice enthalpy add all of the other enthalpy changes?

    As clockwise enthalpy changes = anticlockwise enthalpy changes? :L BTW the enthalpy change of hydration is always exothermic isn't it?
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    (Original post by Vitupero)
    You do realise that the main bulk of your argument will have no affect. OCR states that the exam is more focused on your understanding and your knowledge of chemistry rather than just recalling information. The only part of your argument that you can legitimately argue upon is the time limit, an extra 15 mins and the paper would have been a lot less rushed.
    I'm not the person you quoted but if the grade boundaries set for the exam are usually around the 80% mark for AS, and an average of 20% of people are getting over this, why all of a sudden does the grade boundary for an A become 63% (such as in the january 2011 paper). Surely if only 20% of people are getting over 63% then the paper is too difficult. It's all too subjective to say "The paper was too hard" but when put into figures like this, even someone who didn't sit the paper could say it was too hard, and that the questions need to reflect the ability of pupils sitting the exam.
    Ofcourse the questions should be harder than simple recall ones, but even the chemistry teachers in my department at college who had commented the AS exams were reasonable, had mentioned the summer one this month was too difficult. OCR seem more bothered about "competing" with other exam boards to see which out of them all can have the most demanding paper; and hence "the best". :rolleyes:
    The paper is probably less likely to get a representative and accurate grade to reflect a pupil's ability when the grade boundaries are so close together (like in the January exam) - which is where I think the grade boundaries for this exam will be close to...
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    (Original post by apo1324)
    When calculating the enthalpy change of hydration wouldn't it be the -lattice enthalpy add all of the other enthalpy changes?

    As clockwise enthalpy changes = anticlockwise enthalpy changes? :L BTW the enthalpy change of hydration is always exothermic isn't it?
    thats what ive done? and im pretty sure you wont get a mark for saying 'enthalpy change of hydration is always negative'
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    (Original post by wilsea05)
    thats what ive done? and im pretty sure you wont get a mark for saying 'enthalpy change of hydration is always negative'
    Oh yeah, I see that now. But the answer should be -1921 KJ mol^-1 as it's a negative enthalpy change? So you wouldn't lose a mark if you say its positive?
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    (Original post by apo1324)
    Oh yeah, I see that now. But the answer should be -1921 KJ mol^-1 as it's a negative enthalpy change? So you wouldn't lose a mark if you say its positive?
    oh my bad, yeah that should be a negative value. i did put it as negative in the exam though
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    (Original post by joe3469)
    Nice one dude. All these answers are the same as mine
    pH 2.11 is a strong acid i got around about 4 which makes more sense so i dont know
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    (Original post by BackDoorEntry)
    i got 4x10^-3 s^-1 using a tangent at t=0

    That paper absolutely killed me! Miles harder than both past papers combined, squared, and cubed.

    The last question i got 3.4%, i think i left out a 0 somewhere. This is horrible!
    yh m8 i gt about 5.65 * 10^-3 as well
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    (Original post by Acta Non Verba)
    I found the value of Delta S to be negative and thus the got somewhere in the 400s for delta G, meaning it wasn't spontaneous.
    ave
    same here mate thats what i got but for the end value of delta g u have to take 273 away from it to get the temperature in degrees
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    (Original post by Rickesh)
    Enthalpy of hydration = -2248 ? Or something like that?
    yh i got sumthink lyk that, what did you and other people get for the calculation of pH???:
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    wat did ppl get for the calculation of pH and did ppl get the units as s^-1 for the k question??
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    do you think 75 - 80 raw marks would get you close to 131 ums? sorry for another one of these marks conversion qu's... !
 
 
 
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