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Edexcel - Chemistry Unit 2 - 4 June 2013 watch

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    (Original post by GCSE-help)
    Also there's great news for a lot of people on here. Both mechanisms will be accepted because it says 'suggest the mechanism' and the flame test for the compound will also be accepted (the very end of that question)
    How do you know about the flame test?
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    (Original post by samsimmons)
    I thought this was harder than Jan 13 which was 77. Full ums will probably be between 74-77 I reckon. So you are definitely in with a shot!


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    Yeah and also aren't Jan papers resit papers? So grade boundaries will be maybe higher than usual?
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    it still says other than heating or acid..you still use heat in a flame test. I take 'other than' as NOT with heat or acid? despite that i think i got 70.
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    (Original post by dyingbreed)
    it still says other than heating or acid..you still use heat in a flame test. I take 'other than' as NOT with heat or acid? despite that i think i got 70.
    I think it just means not the heat or acid test, as they were in the two previous questions before it.
    Confusing wording though!


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    (Original post by dyingbreed)
    it still says other than heating or acid..you still use heat in a flame test. I take 'other than' as NOT with heat or acid? despite that i think i got 70.
    My thoughts exactly; how can they give marks for using a flame test when it says "without heat", the whole concept behind a flame test is to use heat to excite electrons. Madness!
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    (Original post by HarryMWilliams)
    How do you know about the flame test?
    From the general context of the question. Also them mentioning 'no acid' also rules out the other option. There is like no other test in the spec you can use
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    (Original post by GCSE-help)
    From the general context of the question. Also them mentioning 'no acid' also rules out the other option. There is like no other test in the spec you can use
    Mm, I still can't understand how a question which would accept a heat-based test can state "without heat" in the stem.

    I look forward to the mark scheme, when it's eventually released.
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    [QUOTE=GCSE-help;43016025]From the general context of the question. Also them mentioning 'no acid' also rules out the other option. There is like no other test in the spec you can us
    For the magnesium and barium carbonate question..... If I put the flame test for the above part of the question and thermal decomposition for the bottom part of the question... do you think I would get the marks?
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    For the magnesium and barium carbonate question..... If I put the flame test for the above part of the question and thermal decomposition for the bottom part of the question... do you think I would get the marks?
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    (Original post by HarryMWilliams)
    Mm, I still can't understand how a question which would accept a heat-based test can state "without heat" in the stem.

    I look forward to the mark scheme, when it's eventually released.
    For the magnesium and barium carbonate question..... If I put the flame test for the above part of the question and thermal decomposition for the bottom part of the question... do you think I would get the marks?
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    or you could react them with ammonium sulfate, giving a barium sulfate precipitate again? (other test question). but is this a standardized test?
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    (Original post by Meehar17)
    For the magnesium and barium carbonate question..... If I put the flame test for the above part of the question and thermal decomposition for the bottom part of the question... do you think I would get the marks?
    If you spoke about thermal decomposition in a question that specifically stated "without heat" then it's unlikely. Although I imagine the flame test you spoke about in the first test question would be credit worthy.
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    [QUOTE=Meehar17;43016138]
    (Original post by GCSE-help)
    From the general context of the question. Also them mentioning 'no acid' also rules out the other option. There is like no other test in the spec you can us
    For the magnesium and barium carbonate question..... If I put the flame test for the above part of the question and thermal decomposition for the bottom part of the question... do you think I would get the marks?
    I have a feeling you might do

    I remember in an Edexcel Physics exam before, they made a really dodgy two-part question which could be interpreted in many ways. So in the mark scheme, they combined both parts and the MS said 'any three from...' giving a list of options for BOTH questions combined (even though in the exam they were two different parts).
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    what are the answer to question 6,10,15 and 16
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    (Original post by dyingbreed)
    or you could react them with ammonium sulfate, giving a barium sulfate precipitate again? (other test question). but is this a standardized test?
    Nope it's not. Theoretically it is correct but then you could have so many different odd tests which are theoretically valid but impractical or not in the spec.
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    (Original post by GCSE-help)
    Nope it's not. Theoretically it is correct but then you could have so many different odd tests which are theoretically valid but impractical or not in the spec.
    is the use of limewater in the above section okay? from heating
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    (Original post by dyingbreed)
    is the use of limewater in the above section okay? from heating
    For which part? Best answer IMO is:

    1) Thermal decomposition for the first part.
    2) Flame test for the second part.

    But I'm not certain and I could be wrong
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    (Original post by GCSE-help)
    For which part? Best answer IMO is:

    1) Thermal decomposition for the first part.
    2) Flame test for the second part.

    But I'm not certain and I could be wrong
    as in thermal decomposition then additional limewater? or how would you tell one has decomposed? a clear gas?
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    (Original post by Meehar17)
    what are the answer to question 6,10,15 and 16
    Hi
    I got B D A B respectively
    Not sure if it's correct though


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    (Original post by HarryMWilliams)
    If you spoke about thermal decomposition in a question that specifically stated "without heat" then it's unlikely. Although I imagine the flame test you spoke about in the first test question would be credit worthy.
    but when they said without heat, I would imagined they meant that you can't use the above test in this question as that required heat :s
 
 
 
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