Spontaneity

[josephyim1L]

How do I determine if a reaction is spontaneous or non spontaneous? E.g. is water melting spontaneous? How do I think through these different scenarios given?

[Hovik Mike Mkryan 2I]

Hello,
Water melting will be spontaneous at its melting point. The scenario has to make clear under what conditions the water is present. The water melting will be spontaneous at 0 Celsius , but it won't be below that temperature. Hope this helped!

[Kevin Tang 4L]

How do I determine if a reaction is spontaneous or non spontaneous? E.g. is water melting spontaneous? How do I think through these different scenarios given?

Spontaneous means the Gibbs Free Energy is less than 0 and not spontaneous means Gibbs Free Energy is greater than 0. Ice will melt spontaneously, turning into a liquid when the temperature is greater than 0 degree C. Although changes in pressure change what temps it is spontaneous at though we shouldnt need to know how to apply this.

[Sapna Ramappa 1J]

Try to look at the situations given and determine whether or not it'll happen without an input of energy.

[Soumya Ravichandran 4H]

You can determine the spontaneity of a reaction by calculating delta G using standard reaction gibbs free energy values or by comparing the signs for enthalpy and entropy at fixed temperature values.