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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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    Thanks for making this mark scheme!!!

    I think it was iron + sulfuric acid (I think)

    Also, for ionic bonding, it is okay to write 'the electrostatic attraction between oppositely charged ions' ...?
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    (Original post by Abodee1)
    How does he know when the crystallisation point is reached? i wrote take a sample and let it cool in air and if it crystallises then the point has been reached.

    And for the aluminium mass i got 180g.
    Crystallisation point is reached when you get a bit on the end of a glass rod and it crystallises on the glass rod
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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?
    Just physics on friday then they're ALL FINISHED !!!!!!!!!!! fml its been 1 1/2 months
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    for some strange reasoni missed the question where you had to add the electrons for sodium or something, does anybody know how many marks that was?
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    did anyone else get 0.00625? for the one which is 0.625 in the mark scheme can someone explain?
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    (Original post by Emilia1479)
    Thanks for making this mark scheme!!!

    I think it was iron + sulfuric acid (I think)

    Also, for ionic bonding, it is okay to write 'the electrostatic attraction between oppositely charged ions' ...?
    yes! forgot to include that in the markscheme, thanks
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    (Original post by Niclewis)
    nope you're wrong once again. It produces carbon monoxide AND carbon AND water AND carbon dioxide
    lol wtf that's wrong
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    (Original post by Cheekymonkey2311)
    for some strange reasoni missed the question where you had to add the electrons for sodium or something, does anybody know how many marks that was?
    3 marks. Including charges.
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    But-1-ene goes colourless, alkanes stay orange.
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    (Original post by Nurne)
    But-1-ene goes colourless, alkanes stay orange.
    But-1-ene + Bromine -> Dibromobutane
    C4H8+Br2->CH3-CH2-CBr2-CH3
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    Wait was there 3 parts on the last question? I thought there was only 2.
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    (Original post by rcmack)
    Edexcel iGCSE Chemistry Paper 2C 15 June, sorry should have specified in the question...
    1c) Colourless liquid is solution
    Are you sure? Although the salt dissolved, the sand didn't... Isn't sand in water a suspension?

    1d) Crystallisation point is when crystals begin to form

    This wasn't in Question 1, but in a later question (maybe Q3 or so)

    7a) 2.75g
    7b) 0.0625mol
    7c) 1500 cm3
    This was from Q8, not Q7, and also there was no part c), and 1500cm3 was the answer to part b).
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    were they two chemistry jokes or not idk (dehydrated/basic)
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    (Original post by johannesburg)
    were they two chemistry jokes or not idk (dehydrated/basic)
    huh?
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    I don't recall there being an answer with 0.0625 moles as an answer. I thought the two answers were 2.75g and 1500cm^3. I did put 0.0625 in my working, if that is what they were after... Also what would 130+ be in terms of grade boundaries. The average from 2013-16 is 121 for an A and 141 for an A*. I'd assume A will be 127... would I be roughtly correct?
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    (Original post by y64654)
    did anyone else get 0.00625? for the one which is 0.625 in the mark scheme can someone explain?
    I can't remember what I got, but did you convert between cm^3 and dm^3 correctly?
    (dm^3 > cm^3 multiply by 1000
    cm^3 > dm^3 divide by 1000)
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    For the Iron (II) and Iron (III) question, could you just say the colour or do you need to put the word precipitate as well?
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    For 2b) It was Iron+ Sulphuric acid -> Iron Sulphate + Hydrogen

    And for 4b not meaning to be nit picky but it's Pipette you accidentally put double p.
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    (Original post by Nurne)
    For 2b) It was Iron+ Sulphuric acid -> Iron Sulphate + Hydrogen

    And for 4b not meaning to be nit picky but it's Pipette you accidentally put double p.
    For 4B didn't it say what you use to measure the KOH, so wouldn't it be measuring cylinder? Or did I just misread the question lol
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    (Original post by jose99)
    Don't think you'll get the marks for smaller chains being more useful - they aren't. They are simply in higher demand.
    I think u need to say why they're in higher demand...because they are more volatile
    Also because they produce alkene are produced to make polymers which can be used to make plastics


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