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    and on the previous one it is argon right?
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    What did people put for the calcium carbonate question? Solid, solution, solid??
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    not sure as well, because h20 varies on certain places
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    (Original post by caiob)
    and on the previous one it is argon right?
    Yes that's correct.
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    for the different solutions? Y, X, Z
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    (Original post by caiob)
    for the different solutions? Y, X, Z
    Yeah
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    i wasnt sure about that one, for the Z one i tried breaking down the components to see what i could make Ca(OH)2 + CO2 but that would give me that CaCO3 back from the beggining, so i just put Y= calcium oxide, X= calcium oxide, Z= calcium carbonate
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    this year's papers seem so hard compared to the older papers, specially for biology and french
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    (Original post by caiob)
    i wasnt sure about that one, for the Z one i tried breaking down the components to see what i could make Ca(OH)2 + CO2 but that would give me that CaCO3 back from the beggining, so i just put Y= calcium oxide, X= calcium oxide, Z= calcium carbonate
    I put calcium carbonate too


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    overall the paper was good, there wasnt any long questions, although some questions were confusing to understand, just gotta hope the grade boundaries are lowered this year
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    (Original post by caiob)
    for the different solutions? Y, X, Z
    Calcium oxide
    Calcium chloride
    Calcium carbonate
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    (Original post by caiob)
    overall the paper was good, there wasnt any long questions, although some questions were confusing to understand, just gotta hope the grade boundaries are lowered this year
    Unfortunately I doubt it as a lot of people found it really easy so I wouldn't be surprised if they're higher... Cry


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    what did u guys get for the questions asking to workout the percentage of oxygen from the syringe experiment?
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    (Original post by TobyGF)
    Calcium oxide
    Calcium chloride
    Calcium carbonate
    I wrote calcium hydrogen carbonate is that fine?
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    (Original post by caiob)
    what did u guys get for the questions asking to workout the percentage of oxygen from the syringe experiment?
    I got 16.67
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    (Original post by pprish.chandaria)
    I got 16.67
    i did as well, but im not sure if its right... do u know?
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    (Original post by caiob)
    i did as well, but im not sure if its right... do u know?
    It should be.
    Because the initial was 150
    And the final was 125

    So (final - initial)/final then multiply by 100.



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    (Original post by TobyGF)
    Calcium oxide
    Calcium chloride
    Calcium carbonate
    I got that too. Is that even on the spec or is it just a question that expects you to work the answer out without prior knowledge?
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    (Original post by dRaGoN2509)
    Yes. I put CO2, I thought of putting O2 but then it said compound so CO2 was the only viable answer since it's the only compound in air (argon, oxygen, nitrogen are elements). Other people put H20 though, not sure if that's right?
    Do you think notrogen dioxide- NO2 would be okay. Was going to write CO2 but then I thought carbon is found primarily in polluted air because of fossil fuels.
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    Did someone take down the unofficial mark scheme?
 
 
 
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