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OCR Chemistry A Exam Thread (Breadth - May 27 2016 and Depth - June 10 2016) watch

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    (Original post by h3rmit)

    Lol I forgot to double the %error, gg me
    Was it two marks or one mark? You usually get a mark if you wrote the correct equation.
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    (Original post by Clintbarton)
    Same thing because they're both halogenation?
    Yeah I think so
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    (Original post by snickercell)
    But if low temp and high pressure push the equilibrium to the product/right hand side then surely that wouldn't produce a good percentage yield since more of the product would break down to form reactants?? There was a similar question in one of the specimen depth papers which is had a contradictory answer to the question in today's paper?Attachment 539407


    Ahh ok that's alright then, hopefully won't lose too many marks
    I think you're misunderstanding equ. yield, if the equ. position shifts to the right you'll have more of the product (SO3) in the equ. yield, which is good
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    (Original post by Clintbarton)
    Was it two marks or one mark? You usually get a mark if you wrote the correct equation.
    just 1 in this case I believe
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    LMAO reading this I lost stupid marks. That big maths question on q=mcdeltaT ****ed me up i spent so long on it hahahhaha I'm gonna go before I doubt myself and cry. At least I got a week to make up for the revision of stuff that wasn't on the test.
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    (Original post by Clintbarton)
    Was it two marks or one mark? You usually get a mark if you wrote the correct equation.
    1 mark
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    (Original post by Firenze26)
    ... I really don't know whether to be happy that the exam was relatively decent or scared by the fact that this will usually mean a high grade boundary.

    Btw, do you guys know what reagent was used to add that oxygen in the second stage of prep in that last question?



    Posted from TSR Mobile
    If you mean the last last question, you had to substitute hydroxyls in the place of halogens through nucleophilic substitution, you can't just add oxygens

    (Original post by Clintbarton)
    Was it two marks or one mark? You usually get a mark if you wrote the correct equation.
    I think (read: hope) two marks
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    (Original post by Clintbarton)
    Was it two marks or one mark? You usually get a mark if you wrote the correct equation.
    1mark
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    Can some make a list of what came up so its easier to tell what we should revise for the next one?
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    (Original post by A Sajid)
    Can some make a list of what came up so its easier to tell what we should revise for the next one?
    it's probably best IMO to just go through everything, maybe a bit of practice on the maths things that didn't come up like pV=nRT as you don't want to regret a 6 marker on Le Chatelier's principle or something
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    (Original post by Jitesh)
    it's probably best IMO to just go through everything, maybe a bit of practice on the maths things that didn't come up like pV=nRT as you don't want to regret a 6 marker on Le Chatelier's principle or something
    I swear there was a 5 marker on Le chats today? the on about the temp and pressure
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    (Original post by 87Mack)
    nah why do you square it? there was only one mole of SO3
    It was two. I promise you.
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    (Original post by 87Mack)
    concentration of S03 = 0.768 anyone????????
    No.
    [SO3]^2=0.786

    Therefore

    [SO3] = 0.887 moldm-3
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    (Original post by A Sajid)
    I swear there was a 5 marker on Le chats today? the on about the temp and pressure
    That's what I mean, they could give a 6 marker because everyone love's Le Chatelier! It's unlikely but who knows???
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    on one question i wrote CrCl2.6H2O for my answer by mistake, but in my working out I shown that it was CrCl3.6H2O. Would I lose a mark for this?
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    (Original post by A Sajid)
    Can some make a list of what came up so its easier to tell what we should revise for the next one?
    We didn't do any mechanisms therefore I think the following will come up:
    -Mechanism(s) of any reactions
    -Ozone depletion
    -Group 2 and trends
    -Analytical techniques e.g. MS, IR...

    Any others?
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    (Original post by Jitesh)
    That's what I mean, they could give a 6 marker because everyone love's Le Chatelier! It's unlikely but who knows???
    You seem to have this under control. What textbook/ revision guide/ material did you use?
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    For the percentage error i said the answer was 2% as 0.005 is to 1 sig fig, will i lose a mark?
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    (Original post by Major Wilson)
    We didn't do any mechanisms therefore I think the following will come up:
    -Mechanism(s) of any reactions
    -Ozone depletion
    -Group 2 and trends
    -Analytical techniques e.g. MS, IR...

    Any others?
    That Polymer sh** also?
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    (Original post by Major Wilson)
    We didn't do any mechanisms therefore I think the following will come up:
    -Mechanism(s) of any reactions
    -Ozone depletion
    -Group 2 and trends
    -Analytical techniques e.g. MS, IR...

    Any others?
    -Types of bonding e.g London forces
    -History of the periodic table
    -Catalysts
    -Polymers
 
 
 
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