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16 November, 22:21

The melting of ice is an endothermic change. What best describes the temperature conditions that are likely to make this a spontaneous change?

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  1. 17 November, 01:59
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    The melting of ice is an endothermic reaction which means it requires energy or the enthalpy of reaction is positive

    For a reaction to be spontaneous the change in free energy should be negative.

    ΔG = ΔH - TΔS

    Where

    ΔG = change in free energy

    ΔH = change in enthalpy

    ΔS = change in entropy

    Now in any case enthalpy will be positive (endothermic)

    Here as ice is melting the process if going from less random phase to more random or disorder phase so there is an increase in entropy or ΔS = positive

    In order to make ΔG negative, the ΔH < TΔS, this is possible only at higher temperature

    Hence, At high temperature the process of melting of ice is spontaneous process.

    At low temperature

    ΔH > TΔS, and ΔG will become positive making the reverse process (freezing) spontaneous and melting of ice non spontaneous.
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