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What does a process require to be spontaneous at all temperatures? Answer a catalyst and lower activation energy positive enthalpy and negative entropy changes a heat source and high activation energy negative enthalpy and positive entropy changes

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MissPhiladelphia
I think the correct answer from the choices listed above is the last option A process requires negative enthalpy and positive entropy changes to be spontaneous at all temperatures. These processes proceed when left to themselves, and in the absence of any attempt to drive them in reverse. Hope this answers the question.

Answer: negative enthalpy and positive entropy changes

Explanation:

[tex]\Delta G=\Delta H-T\Delta S[/tex]

[tex]\Delta G[/tex] = free energy change

[tex]\Delta H[/tex] = enthalpy change

T= temperature in Kelvin

[tex]\Delta S[/tex] = entropy change

[tex]\Delta G= -ve[/tex], reaction is spontaneous

If [tex]\Delta H=-ve[/tex] [tex]\Delta S=+ve[/tex]

[tex]\Delta G=(-ve)-T(+ve)[/tex]

[tex]\Delta G=(-ve)(-ve)[/tex]

[tex]\Delta G=(-ve)[/tex]

Thus reaction is spontaneous.

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