OCR Chemistry A 2016 unofficial mark scheme 27/05/16

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    (Original post by jn998)
    An A is going to be less than 58, no matter how easy you think the paper was. 58 would be 83%. The highest it has ever been is 81% and that was on one of the old papers, back when only half the course was assessed in each test, add to that the fact that it is a new syllabus and the average A boundary over the past few years has been 75% I would assume 52 for an A.
    In fact, one of the highest it has ever been is 83%...
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    (Original post by jn998)
    This seems realistic. Did anyone keep a record of their multiple choice answers? I rushed through it and think I got quite a few wrong but I got: BDDCCCBDCBCBACBADBAD
    I can't remember the order of my answers but I did recognise that the vast majority of my answers were B's in multiple choice..
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    On the isotope question can you write on the similarities that they react the same way nd difference that they can have different proporties???
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    (Original post by LivToBe)
    In fact, one of the highest it has ever been is 83%...
    One of the highest might have got 83%, but that happened recently I think. They cannot exceed 80% in our exams because we are doing the new specification and its the first year, which involves more content to remember for both of the exams.
    A will probably be 53/54 which is roughly 75-77%.
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    (Original post by 04hs02)
    On the isotope question can you write on the similarities that they react the same way nd difference that they can have different proporties???
    Wasn't sure what it meant so said the similarities was same number of protons and difference was neutrons and mass
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    (Original post by 04hs02)
    On the isotope question can you write on the similarities that they react the same way nd difference that they can have different proporties???
    Similarities - same number of protons and having similar chemical properties

    Differences - different number of neutrons and different masses is what they'll probably be looking for.
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    This guy is a teacher and will do the whole paper and post the mark scheme https://twitter.com/ChemistryALevel
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    (Original post by oni176)
    Similarities - same number of protons and having similar chemical properties

    Differences - different number of neutrons and different masses is what they'll probably be looking for.
    I thought chemical properties were based on the electrons
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    Forgot what it meant by an homologous series -_-. Not sure I want to ruin my weekend by looking at the unofficial mark scheme. :ahhhhh:
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    (Original post by Bosssman)
    It was Cr3Cl . 6H2O
    It was CrCl3 6H20 btw
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    (Original post by SGHD26716)
    I think there are always 20 marks available in MCQ. Shape around graphemes, I put tetrahedral.
    I put trigonal planar. Due to the fact it has 3 bonded atoms and a lone pair - which against normal rules would cause it to be trigonal pyrimidal. However, graphene is one layer of graphite, therefore is planar. Due to its symmetrical nature and the fact that the lone pair, then becomes delocalised - hence why it gives graphene conducting properties - it had to be trigonal planar. Really funny question, would've caught a lot out.
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    (Original post by jn998)
    I thought chemical properties were based on the electrons
    It is based on electrons, an I sotope has the same number of electrons too.
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    For the question about "How can you make sure that all of the water of hydration has been removed?" or something like that - do you think they would accept adding cobalt chloride paper?
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    (Original post by ComputeiT)
    For the question about "How can you make sure that all of the water of hydration has been removed?" or something like that - do you think they would accept adding cobalt chloride paper?
    They'll be a few correct answers. Personally I just said heat for a longer period of time or calculate theoretical mass of water from an equation.
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    (Original post by KevinClyde)
    They'll be a few correct answers. Personally I just said heat for a longer period of time or calculate theoretical mass of water from an equation.
    Yeah hopefully - I left it out and came back to it at the end so just described that test for the presence of water and the observation!
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    (Original post by adapttochangelad)
    It was CrCl3 6H20 btw
    Yeah, sorry my mistake.
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    (Original post by jn998)
    I thought chemical properties were based on the electrons
    An isotope also has the same number of electrons too.
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    (Original post by Bosssman)
    I used the periodic table value, I'm sure for that question they'll allow either as it didn't specify
    I used it too, I'm got something like ....x10^-25 thou... might be wrong thou, I can't exactly remember what i put!
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    Does anyone remember the second multiple choice question? I'm pretty sure I got a B in that but on this thread people seem to have gotten a C/D?
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    I think the grade boundaries will be the same as usual. Even if it was an easier paper than previous papers you have to take into account that for us we have to learn everything whereas before the topics were split
 
 
 
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