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    Anyone know how the machine that marks the multiple choice works, worried it wont pick up on my crosses because my pen had started to die
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    (Original post by crimson1234)
    Anyone know how the machine that marks the multiple choice works, worried it wont pick up on my crosses because my pen had started to die
    As long as your crosses have enough contrast against the white paper the optical mark recognition software will pick it up, and I imagine it's smart enough to send it for human review if it's uncertain.
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    (Original post by scrlk)
    As long as your crosses have enough contrast against the white paper the optical mark recognition software will pick it up, and I imagine it's smart enough to send it for human review if it's uncertain.
    How the hell does that work then when you cross one out? I made a mistake in physics so I had to cross it out and tick another box, I even circled the box. Also, my pen blotted one of the boxes (the one I chose) in one of the MCQs, is that a problem?
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    (Original post by JoeyTr)
    I really do hope you're right, but it's been 80 for a* twice before and I don't see this being any different. But I do hope you're right.
    The exam felt easy but it was not that trivial after looking back, compared to June 15 which was just a flurry of 1 mark questions with a few tricky ones, we got quite a few high mark questions and loads of trick ones also.

    Maybe 76-77 for A* don't really see it being 80 but it could very well be.
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    (Original post by oShahpo)
    How the hell does that work then when you cross one out? I made a mistake in physics so I had to cross it out and tick another box, I even circled the box. Also, my pen blotted one of the boxes (the one I chose) in one of the MCQs, is that a problem?
    Was this AQA Unit 4 the other day? The MCQ sheet had instructions on the back on how to change your answer.

    I'm not 100% sure that Edexcel uses automated marking in their MCQs as a friend had one of his correct answers marked as wrong (even though it was the only answer selected) so it could still be marked by a human.
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    (Original post by scrlk)
    As long as your crosses have enough contrast against the white paper the optical mark recognition software will pick it up, and I imagine it's smart enough to send it for human review if it's uncertain.
    Thanks
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    what did everyone write for the vanadium 5 mark question at the begginging when it was asking for its oxidation state at the end of the reaction ?????//
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    I was a bit stupid in the 5 marker and put these steps:

    Reflux: KCr2O7 to make carboxylic acid intermediate

    HCL (I know that's wrong, it's PCl5) to make Acyl Chloride intermediate

    NH3 to made amide product

    Would I get 2 marks or get the third step right?
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    (Original post by xdaryaxx)
    what did everyone write for the vanadium 5 mark question at the begginging when it was asking for its oxidation state at the end of the reaction ?????//
    Final is +4
    I wrote equation of reduction of +5 to +4 and calculated E cell. It was positive.
    Then wrote equation of proposed reduction of +4 to +3 and calculated E cell but it was negative. Therefore it is +4
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    For the 5 mark percentage by mass question how many significant figures did it ask for? I'm overthinking and worrying I've lost a stupid mark hahah
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    I already asked this at the start but the discussion was moving so fast it was probably missed.

    What did you guys write for the very last 2 marker about the cations and anions?
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    (Original post by kirst26)
    For the 5 mark percentage by mass question how many significant figures did it ask for? I'm overthinking and worrying I've lost a stupid mark hahah
    They didn't ask iirc. I hope not anyway.
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    (Original post by melanin101)
    I already asked this at the start but the discussion was moving so fast it was probably missed.

    What did you guys write for the very last 2 marker about the cations and anions?
    I wrote COO- and NH3+ for all of those groups but I really am not sure
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    (Original post by melanin101)
    I already asked this at the start but the discussion was moving so fast it was probably missed.

    What did you guys write for the very last 2 marker about the cations and anions?
    the question didnt specify
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    Was ethanoyl chloride the answer to anything?i remember writing it down but no one here's mentioned it
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    (Original post by PythagorasRex)
    Was ethanoyl chloride the answer to anything?i remember writing it down but no one here's mentioned it
    Yeah, it was conversion from amine or sth
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    (Original post by kevinchan1)
    I was a bit stupid in the 5 marker and put these steps:

    Reflux: KCr2O7 to make carboxylic acid intermediate

    HCL (I know that's wrong, it's PCl5) to make Acyl Chloride intermediate

    NH3 to made amide product

    Would I get 2 marks or get the third step right?
    The question didn't specify conditions just reagents and intermediates.

    So the marks will be,
    Excess K2Cr2O7
    Dilute H2SO4 (1)
    Benzoic Acid Intermediete (1)
    Add PCl5 (1)
    Benzoyl Chloride Intermediete (1)
    Add NH3 (1)
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    (Original post by C0balt)
    I wrote COO- and NH3+ for all of those groups but I really am not sure
    I'm not sure either but I did this:

    Amino acid = NH3+[Nonsense part of molecule]COOH
    Acid: [Nonsense part of molecule]COO-

    So basically the amino acid was a zwitterion that got protonated by the carboxylic acid. (<-- can that even happen?)

    ----

    What I'm not sure about was if you were meant to put them together (like a salt) or write both anion and cation separately. I chose the latter.

    Sorry if it looks like I don't know what I'm talking about, I didn't even know what zwitterions were until yesterday afternoon where I had to learn all of transition metals, arenes, nitrogen chem and organic analysis ;__; God bless Geroge Facer and chem revise loool
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    (Original post by melanin101)
    I'm not sure either but I did this:

    Amino acid = NH3+[Nonsense part of molecule]COOH
    Acid: [Nonsense part of molecule]COO-

    So basically the amino acid was a zwitterion that got protonated by the carboxylic acid.

    ----

    What I'm not sure about was if you were meant to put them together (like a salt) or write both anion and cation separately. I chose the latter.

    Sorry if it looks like I don't know what I'm talking about, I didn't even know what zwitterions were until yesterday afternoon where I had to learn transition metals, arenes, nitrogen chem and organic analysis. God bless Geroge Facer and chem revise loool
    I drew separately from the way they said to draw cation and anion.
    Which amine group did you protonate though?
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    (Original post by DesignPredator)
    The question didn't specify conditions just reagents and intermediates.

    So the marks will be,
    Excess K2Cr2O7
    Dilute H2SO4 (1)
    Benzoic Acid Intermediete (1)
    Add PCl5 (1)
    Benzoyl Chloride Intermediete (1)
    Add NH3 (1)
    Wtf is wrong with me I wrote phenyl methanoic acid instead of benzoic acid and phenyl methanoyl chloride instead of benzoyl chloride 😩 Just didn't clock that they're the same as benzoic acid and benzoyl chloride lol fml
 
 
 
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