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OCR B (Salters) Chemistry F331 (Chemistry for Life) Thursday 23rd May Exam Discussion Watch

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    What did you guys write for the peak at 20?
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    (Original post by AdibC)
    for the ion one i wrote o 2-
    that would give 18 wouldnt it, and its an ion....
    Nope, oxygen weighs 16 it was water

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    These were all the assumptions i came up with:

    for the observations: exothermic, fizzing (H2 gas), and its a steady speed reaction

    For the q=mc delta t:
    That 50cm3 = 50g
    that the acid has the same specific heat capacity as water,
    and that 5 Celsius = 5j? (not to sure)

    I wrote down more than 2 assumptions/observations for the questions, does anyone have an idea if writing more than 2 will lose marks?
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    (Original post by amood00)
    These were all the assumptions i came up with:

    for the observations: exothermic, fizzing (H2 gas), and its a steady speed reaction

    For the q=mc delta t:
    That 50cm3 = 50g
    that the acid has the same specific heat capacity as water,
    and that 5 Celsius = 5j? (not to sure)

    I wrote down more than 2 assumptions/observations for the questions, does anyone have an idea if writing more than 2 will lose marks?
    i think they just ignore any other that your first two, not sure though
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    (Original post by nick d terrier)
    i think they just ignore any other that your first two, not sure though
    nickyyyyyyy D
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    (Original post by nick d terrier)
    Any news of an unnofficial mark scheme??
    anyone
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    (Original post by krisshP)
    I got 56.9 right at the end. Only at the end I realised you're supposed to calculate moles of magnesium carbonate to get the moles of CO2, then just times moles by 24,000cm3 to get the answer. I messed up first, but then writ at the end I got the correct answer. Would I get full marks or not since my working out was messy, but my final answer was clear, and it does usually say award full marks for a correct answer?

    Thanks
    I am so annoyed at myself, I put 56900 or something because they cm3 thing confused me
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    Does anyone know is there is an unnofficial mark scheme lying about anywhere?
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    (Original post by SyedaK)
    I'm scared I'll fail this exam. I was confident to do this paper and every time I feel confident, I get too many questions wrong. This is sometimes too much!


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    I totally understand you
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    (Original post by numnutx)
    I totally understand you
    Thank you . Lets just hope we get a decent grade. I don't know of it's with every school but if we fail two exams out of four then we re-take the whole year again. And I seriously do not want to do that.
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    Damn, for the very last question I only put "Different isotopes of Oxygen were present" as I had no clue what to write! Anyone think that will pick me up a mark?


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    (Original post by anthonyrf)
    Damn, for the very last question I only put "Different isotopes of Oxygen were present" as I had no clue what to write! Anyone think that will pick me up a mark?

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    Well that is the correct answer I believe so yes, although I did add that there may have also been isotopes of hydrogen
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    (Original post by ElChapo)
    Well that is the correct answer I believe so yes, although I did add that there may have also been isotopes of hydrogen
    Cheers!


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    Is putting something about:
    'no heating or deformation that could cause redeposition or loss of isotopes'
    'no movement of the daughter or mother nuclei since the time of crystaliisation'
    worth 2 marks?
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    Is there an unofficial mark scheme around anywhere? I really need a good grade on this paper!
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    Hi im really stuck on enthalpy as and I need a detailed dumbed down explanation so I can understand. Anyone has a suggestion pwetty please. Ps I'm an AS student
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    Hi does anyone have a copy of the F331 paper for June 2013 with the mark scheme? Would be much appreciated guys.
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    (Original post by abcd123456)
    Hi does anyone have a copy of the F331 paper for June 2013 with the mark scheme? Would be much appreciated guys.
    I do
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    (Original post by The_Blade)
    I do
    Would it be possible to get a copy? Either on here or email, which ever is easiest thanks =D
 
 
 
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