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Edexcel Chemistry IGCSE 1C Unofficial Mark Scheme 19th May 2016 Watch

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    If it would form calcium carbonate, water is also formed, but in the diagram there was only 1 product
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    (Original post by grace_wh)
    I don't think it was, in my opinion, I think I put calcium carbonate.
    The answer was calcium carbonate. It's the simple test we learnt where you bubble CO2 through limewater Ca(OH)2 to form a solid precipitate of CaCO3.
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    6d said "max temperature rise", not "max temperature" - thus its 10 degrees.
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    (Original post by DontSweatIt)
    6d said "max temperature rise", not "max temperature" - thus its 10 degrees.
    I agree, 10 degress was the maximum temperature rise and so should be the answer

    (23 degrees with no solution, and 33 with solution)
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    Does anybody know the answers for the Calcium carbonate ones with the 3 answers?
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    (Original post by DCFGHVBJNKJM)
    Does anybody know the answers for the Calcium carbonate ones with the 3 answers?
    Its on my mark scheme I think - CaO, something chloride (can't remember), CaCO3.
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    It's 4 dyes
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    (Original post by conradliebers)
    Its on my mark scheme I think - CaO, something chloride (can't remember), CaCO3.

    also for the calcium reaction was it fizzes and an orange flame?
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    (Original post by MattB_)
    It depends on the difficulty of paper 2. If paper 2 is of a similar difficulty I would imagine the grade boundary to between 137-140 (out of 180)?

    I think the calcium carbonate one was:
    Calcium oxide
    Calcium chloride
    Calcium hydrogen carbonate (a question later in the paper basically gave this answer away)
    Yeh i found that, i originally put calcium carbonate, but then changed because i saw the later question. The first one was calcium oxide, which most people got, but that was also given away in the question about the 3 equations, as all 3 decomposed in potassium oxide, so it was easy just to have any <metal> then oxide
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    what did you put for why the results of experiment y were different from experiment x??
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    What was the one with the calcium reaction ? fizzing and orange flame?
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    (Original post by -Max-)
    Thanks for this!
    Very welcome.
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    (Original post by DCFGHVBJNKJM)
    What was the one with the calcium reaction ? fizzing and orange flame?
    I put effervescence (fizzing) and that the calcium solid disappears as an aqueous solution is formed
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    (Original post by DCFGHVBJNKJM)
    What was the one with the calcium reaction ? fizzing and orange flame?
    There is more than one answer but I wrote it eventually disappears, and it floats on surface of water.
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    (Original post by MattB_)
    I put effervescence (fizzing) and that the calcium solid disappears as an aqueous solution is formed

    Was it added to HCl or water?
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    Guys is there a unoffical mark scheme for qp 42 and 12
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    (Original post by DCFGHVBJNKJM)
    Was it added to HCl or water?
    Water
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    (Original post by Abodee1)
    Was it 4 or 3 dyes?
    4 dies i think
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    Starting topics for Paper 2 then

    The whole of electrolysis;
    Molten - maybe too easy so they'll leave this (unless calculation involved)
    Aqueous
    Metal Extraction (usual Qs - cryolite, replacing electrodes)
    Ionic half equations
    Brine
    Faradays
    Coulombs

    Crude oil, leading to cracking, then to polymers (condensation).

    Giant structures.


    It will be more challenging, but it's only an hour
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    4f is wrong- it was because the acid was already in excess so adding more would do nothing.
 
 
 
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