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Edexcel Chemistry Unit 2 (C2) - 14th June 2017 Discussion watch

  • View Poll Results: How did you find the exam?
    Really easy 😊
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    How did everyone find the Edexcel C2 exam today?

    I think overall it wasn't that bad, a majority of questions were repeated from past papers, although that first 6 marker wasn't great for me.

    Also, for the potassium and water reaction, I put:

    2K + 2 H2O → 2KOH + H2

    Did anyone else get the same?
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    (Original post by BenjiManCan)
    How did everyone find the Edexcel C2 exam today?

    I think overall it wasn't that bad, a majority of questions were repeated from past papers, although that first 6 marker wasn't great for me.

    Also, for the potassium and water reaction, I put:

    2K + 2 H2O → 2KOH + H2

    Did anyone else get the same?
    That's what I got too!
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    what was the empirical formula question answer?
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    What were some of the point for the first 6 mark question???
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    (Original post by Zainyg)
    what was the empirical formula question answer?
    Cu2S
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    (Original post by Noshin21a)
    What were some of the point for the first 6 mark question???
    it's an isotope
    isotopes explained
    2 extra neutrons in neon 22
    20.2 is closer to 20 than 22 because neon 20 is more abundant ( 90% )

    the relative atomic mass formula

    relative abundance of isotope 1 x its mass + relative abundance of isotope 2 x its mass divided by 100

    the calculation:

    90 x 20 + 10 x 22 / 100
    = 20.2

    for the average atomic masses of the isotope leaving a relative atomic mass of 20.2

    that's what I remember writing off the top of my head. I wrote more I just can't remember.
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    Same! Does anyone have the unofficial mark scheme or the questions?
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    (Original post by NateRiver)
    Cu2S
    I got that too
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    https://www.thestudentroom.co.uk/sho....php?t=4780944

    Any help in putting together this unofficial markscheme would be appreciated
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    has anyone got an unofficial mark scheme??
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    (Original post by NateRiver)
    Cu2S
    haha yess that's what I got too, thanks mate
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    What about the mass of magnesium maths question, pretty sure the answer was 31.8?
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    (Original post by ChezPlayz)
    What about the mass of magnesium maths question, pretty sure the answer was 31.8?
    Yeah I got that
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    (Original post by ChezPlayz)
    What about the mass of magnesium maths question, pretty sure the answer was 31.8?
    I got 31.8 as well
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    (Original post by Noshin21a)
    What were some of the point for the first 6 mark question???
    I believe the question was about neon-20 (90% of sample) and neon-22 isotopes (10% of sample), which have a relative atomic mass of 20.2 and the structure of neon-22.

    So I think mark scheme will be looking for comments made about them being isotopes, and neon-22 having 10 protons, 12 neutrons (2 more than neon-20) and 10 electrons. Also, as they were looking for comments on structure, you probably could've mentioned the electronic structure (2.8) and that the full shell made it a noble gas.

    To explain the 20.2 relative atomic mass, I just used the calculation to work out relative atomic mass, which was something like:

    (90*20) + (10*22)/100
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    Im thinking i got like 55/60
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    I wrote the same as well
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    (Original post by H4leem3)
    That's what I got too!
    You had to put state symbols as well as it was a 3 marker
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    (Original post by MIKESPIKE10)
    You had to put state symbols as well as it was a 3 marker
    (S) was the state symbol?
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    That was insanely easy, I'd be surprised if I didn't get 60/60
 
 
 
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