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2016 IGCSE Chemistry Paper 2 Unofficial Mark Scheme 2016 Watch

  • View Poll Results: How did Paper 2 IGCSE Chemistry go?
    95-100%
    23
    19.66%
    90-95%
    29
    24.79%
    80-89%
    27
    23.08%
    70-79%
    21
    17.95%
    60-69%
    9
    7.69%
    50-59%
    2
    1.71%
    40-49%
    2
    1.71%
    30-39%
    0
    0%
    20-29%
    2
    1.71%
    <20%
    2
    1.71%

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    For me, worst case scenario would be 52/60, so yay

    Btw, I put orange instead of red, because the question said 'neutralised', and it only turns red when acidic.

    And omds , the titration came up like the 4th year in a row, so it is like getting 8 free marks.
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    (Original post by IGCSETANK)
    Anyone that put just CO2 and H2O got it wrong - the picture taken in the CGP is COMPLETE combustion - this asked for INCOMPLETE COMBUSTION. Aditionally red would be acceptable as I reviewed this w/ my teacher.
    Guys supposing in the question it wrote that incomplete combustion produces carbon monoxide, its kinda obvious to include it in the equation lol
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    why did they heat the acid? was it to start the reaction or to increase the rate?
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    (Original post by defenestrated)
    why did they heat the acid? was it to start the reaction or to increase the rate?
    Increase rate, the same question was there in june 2015 1c.
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    Ok this has been annoying me, for the basic oxide and acidic oxide, i put sodium and chlorine respectively. Will i get marks?
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    (Original post by Talkand...Talk)
    how much is an A*, i think i got 76%
    Its going to be really high but not above 146.
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    (Original post by rcmack)
    theres alot of questions missing from the mark scheme tho :/
    thxs for reasurance
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    GUYS ON THE LAST PAGE, THERE WAS ONLY TWO QUESTIONS RIGHT

    Like the two answer lines you put 2.75g and 1500cm3, you didn't have to right down the number of moles anywhere (apart from your working)
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    (Original post by Castro300)
    Ok this has been annoying me, for the basic oxide and acidic oxide, i put sodium and chlorine respectively. Will i get marks?
    since chlorine is a non-metal, it will produce an acid oxide, i just didnt put it in the exam as ive never heard of chlorine oxide
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    (Original post by Abodee1)
    Its going to be really high but not above 146.
    Damn it shouldn't go that high!! I would have though 140 is reasonable; like the papers weren't that easy
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    is silicion dioxide acidic?
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    (Original post by Abodee1)
    Increase rate, the same question was there in june 2015 1c.
    which paper? i just checked May 2015 it's not on there
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    Ok these are the questions im worried about, can anyone tell me the right answers:
    Which stage insoluble impurities are removed in calcium oxide-i put 3

    How do u know its in excess-i put solid formed at bottom

    Why cracking is important, i put bigger demand for short chains and short chains more useful
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    (Original post by Abodee1)
    im pretty sure its 8 because its an ion, it has lost its 2 outer electrons to form the outer shell and formed a shell with 8 electrons.
    I think you can technically put either, I put 8 but im pretty sure I've seen mark schemes that accept both
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    (Original post by Niclewis)
    Because it's methane...
    Well I couldnt find any past papers with octane, but there's this webpage: http://chemistryhelp.net/basic-chemi...monitoring-q-a and a few Yahoo Answers I found (while they are not necessarily reliable, many were in agreement), and probably several more sources if I could be bothered to look
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    I think they will probably accept any balanced equation that has at least water and carbon monoxide
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    (Original post by aaljhfgahsj)
    Damn it shouldn't go that high!! I would have though 140 is reasonable; like the papers weren't that easy
    ikr!! Ifits 140 then i will prob get an A
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    (Original post by Castro300)
    Ok these are the questions im worried about, can anyone tell me the right answers:
    Which stage insoluble impurities are removed in calcium oxide-i put 3

    How do u know its in excess-i put solid formed at bottom

    Why cracking is important, i put bigger demand for short chains and short chains more useful
    The insoluble impurities were removed at stage 2, as they were filtered out, leaving salt water.
    Other 2 are correct
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    (Original post by Niclewis)
    which paper? i just checked May 2015 it's not on there
    http://qualifications.pearson.com/co...-June-2014.pdf
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    For "why do you heat the acid" i said to help the solid dissolve. Would i get it for that? And also for the excess one is it that the solid will sink to the bottom of the beaker?
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    It was 2014 june, my bad.
 
 
 
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