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    It's C3 on Monday!! I have a few revision queries I'd like to share...

    It says on the spec that alcohols should be represented in the following form:

    (ethanol) CH3CH2OH

    I understand this is the structual formula, and represents how it's drawn. However, I have always been taught to write it like this:

    C2H5OH

    Do people think this would still get marks, or do I have to start writing structural formulae?

    Also... I've realised that the concept of equilibrium is causing a few problems. I understand the idea of the reactions working at exactly the same rate in each direction, but I don't see how that produces a yield with 'relative amounts of each reacting substance at equilibrium'.

    Thanks everyone and good luck!
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    (Original post by indigorain)
    It's C3 on Monday!! I have a few revision queries I'd like to share...

    It says on the spec that alcohols should be represented in the following form:

    (ethanol) CH3CH2OH

    I understand this is the structual formula, and represents how it's drawn. However, I have always been taught to write it like this:

    C2H5OH

    Do people think this would still get marks, or do I have to start writing structural formulae?

    Also... I've realised that the concept of equilibrium is causing a few problems. I understand the idea of the reactions working at exactly the same rate in each direction, but I don't see how that produces a yield with 'relative amounts of each reacting substance at equilibrium'.

    Thanks everyone and good luck!
    1) It depends on the mark scheme, they can be quite nit picky but both are correct.

    2) The reaction is going forwards as well as backwards hence when the reaction is going to the left, all of the reactants are also being produced in the ratio in which they are reacting.

    E.g 2h2+o2 -- > 2h2o

    if the reaction goes to the left hand side, the hydrogen and oxygen will be produced in relative amounts of 2:1
 
 
 
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