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2016 IGCSE Chemistry Paper 2 Unofficial Mark Scheme 2016 watch

  • View Poll Results: How did Paper 2 IGCSE Chemistry go?
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    (Original post by Abodee1)
    Cuo+2HNO3----->H2O+Cu(NO3)2
    I wrote the same but there are people from my school which wrote oh instead of h20
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    (Original post by rcmack)
    ?) HNO3 + CuO -> Cu(NO3)2 + H2O
    unbalanced. must be 2HNO3
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    (Original post by Nurne)
    It changes from red at 3.1 pH that is not slightly acidic that is very acidic. It shouldn't be accepted.
    I have no idea which is the correct answer, but I know both red and orange were accepted on a past paper for a very similar question
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    (Original post by elertopo)
    I wrote the same but there are people from my school which wrote oh instead of h20
    Metal oxide+Acid---->Water + salt.
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    (Original post by Abodee1)
    unbalanced. must be 2HNO3
    oh yea, forgot about that, thanks!
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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
    Don't think you'll get the marks for smaller chains being more useful - they aren't. They are simply in higher demand.
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    (Original post by jose99)
    silicon wasn't an option
    It defo was. Silicon is in period 3 and i chose it because an example of neutralisation is CaO reacting with SIO2. so it must be acidic.
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    Anybody got the igcse chemistry paper 2 dual?


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    (Original post by rcmack)
    any other questions??
    Why is cracking important? I wrote: Because the products obtained can be very useful.For example ethene can be hydrated to make ethanol and some other alkenes are reactive and can be used to make useful polymers.THAT DOESNOT MEAN THIS IS THE RIGHT ANSWER.
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    (Original post by jose99)
    silicon wasn't an option
    SiO2 is very weakly acidic, I think it may be accepted.
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    did u guys wrote iron sulfate or sulfide for the blank filling? i wrote iron sulfate.
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    (Original post by Abodee1)
    Why is cracking important? I wrote: Because the products obtained can be very useful.For example ethene can be hydrated to make ethanol and some other alkenes are reactive and can be used to make useful polymers.THAT DOESNOT MEAN THIS IS THE RIGHT ANSWER.
    i saw on a mark scheme (cant remember which) that the reason for cracking to shorter chain was because shorter chain lengths are used for cars, which are in high demand
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    (Original post by rcmack)
    i saw on a mark scheme (cant remember which) that the reason for cracking to shorter chain was because shorter chain lengths are used for cars, which are in high demand
    cars? how lol.Yeh fuel... why didnot i think about it....
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    (Original post by Abodee1)
    It defo was. Silicon is in period 3 and i chose it because an example of neutralisation is CaO reacting with SIO2. so it must be acidic.
    From the table, the 'S' is the symbol for sulphur, Silicon would be Si
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    (Original post by jose99)
    From the table, the 'S' is the symbol for sulphur, Silicon would be Si
    https://www.google.com/search?q=peri...6WrltCUFUfM%3A


    Si was also there.
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    My apologies
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    It was my last exam for this year :P i have done bio, chemistry and maths in year 10 and going to do 5 other subjects next year (11).What subjects are left for you guys?
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    (Original post by Abodee1)
    It was my last exam for this year :P i have done bio, chemistry and maths in year 10 and going to do 5 other subjects next year (11).What subjects are left for you guys?
    Physics paper 2, geography paper 3 and general studies paper 2. fun fun fun
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    (Original post by jose99)
    Physics paper 2, geography paper 3 and general studies paper 2. fun fun fun
    Haha, Best of luck mate !
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    (Original post by Niclewis)
    they refuse orange. It's brown.
    Orange-Brown Precipitate would be accepted.
 
 
 
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