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AQA chemistry higher- spec B watch

    • PS Helper

    PS Helper
    It was minus anyways! When you did it in the calculator.

    Sounded a little too hyperactive. Sorry. trying to revise history and it's killing me

    o dear....it depends which way you minus them....if working out deltaH then you take the bonds formed from the bonds broken to get a negative. If working out energy change then you do bonds formed - bonds broken to give a POSITIVE NUMBER.

    Unless you stipulated DeltaH=-730kj/mol then in the answer space you just wrote +730 (or 730)

    It actually doesn't mater because in mark schemes for previous paper it says 'ignore sign"

    Yeah, the sign is shown in brackets on the mark scheme, so i don't suppose it matters, after all that!

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