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AQA GCSE Chemistry Unit 2 24 May 2012

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    Is there an unofficial mark scheme for c2?


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    Yeah for the tick question I put hydrogen is less reactive.
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    (Original post by grangran1234)
    Yeah for the tick question I put hydrogen is less reactive.
    same
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    guys please, you have to admit that this was the easiest exam out of all of the past papers. in january 2010 the boundary was 38 for an A*. this was easier so i have a bad feeling.....maybe 39/40 for an A*.
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    (Original post by tssf_skye)
    I can't remember the questions exactly, but what did everyone write for the stuff on ammonia?

    There was one about the yield and pressure.. i can't really remember haha
    The one about pressure was why dont the manufactorers increase the pressure to above (really high number)?
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    (Original post by osama2)
    guys please, you have to admit that this was the easiest exam out of all of the past papers. in january 2010 the boundary was 38 for an A*. this was easier so i have a bad feeling.....maybe 39/40 for an A*.
    I completely dissagree! I found the jan mock very very easy and got and A and this very hard and Im thinking ill get a C from it
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    what did u put for the oxidation or something? i said losing electrons. reduction is gaining so i think i was right?
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    (Original post by osama2)
    what did u put for the oxidation or something? i said losing electrons. reduction is gaining so i think i was right?
    Yeah thats correct
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    what were the two reasons about that it doesnt matter if the yield is low?
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    (Original post by Chlomc)
    The one about pressure was why dont the manufactorers increase the pressure to above (really high number)?
    The one about yield and pressure was. Why does increasing the pressure increase the yield? the answer is because there is more molecules of gas on the reactant side. . .
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    (Original post by osama2)
    what did u put for the oxidation or something? i said losing electrons. reduction is gaining so i think i was right?
    Yeah I said that aswell
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    what did i write for what question?
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    unofficial markscheme anyone?
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    what did you guys get for ca= ca+2 equation
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    (Original post by Aidanb90)
    The one about yield and pressure was. Why does increasing the pressure increase the yield? the answer is because there is more molecules of gas on the reactant side. . .
    Yes thats correct, its becuase there are more mjoles of products than there are of reactants and the increase in pressure prefers that so it produces a higher yield of reaction
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    (Original post by osama2)
    what were the two reasons about that it doesnt matter if the yield is low?
    i put it that the costs are low as sources are readily available, and that the reaction was fairly quick.
    not sure if its right though
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    Guys you have to admit this is a pretty hard paper compared to Last years so i think the grade boundary will decrease maybe like 33/45 for A*
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    (Original post by Chlomc)
    The one about pressure was why dont the manufactorers increase the pressure to above (really high number)?
    was this because a lot of energy is required so it is expensive?
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    +2e-
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    i said that high pressures are dangerous and costs a lot to maintain
 
 
 
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