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8 November, 23:38

Is the reduction of copper from copper (ii) oxide by carbon exothermic or endothermic? what is the sign of the energy change?

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  1. 9 November, 01:53
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    Answer;

    -Exothermic reaction;

    -The sign of the energy change is negative (-)

    Explanation;

    2CuO (s) + C (s) - -> 2Cu (s) + CO2 (g)

    ΔH = ΣΔHf (products) - ΣΔHf (reactants)

    ΔH = - 393.5kJ - 2 (-155.2kJ) = - 83.1 kJ

    The reaction is exothermic.

    -An exothermic process or reaction releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings.
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