Non-spontaneous and spontaneous processes






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Jaira_Murphy_2D
Posts: 31
Joined: Fri Apr 06, 2018 3:00 am

Non-spontaneous and spontaneous processes

Postby Jaira_Murphy_2D » Sun Feb 17, 2019 8:02 pm

What does a non-spontaneous process need to become spontaneous?

Harshita Talkad 4L
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am

Re: Non-spontaneous and spontaneous processes

Postby Harshita Talkad 4L » Sun Feb 17, 2019 8:05 pm

Changing the temperature can make a reaction spontaneous, since increasing temperature will increase entropy. At a certain temperature, the value for Gibbs free energy will become negative and the reaction will be spontaneous.

arif_latif_2G
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

Re: Non-spontaneous and spontaneous processes

Postby arif_latif_2G » Sun Feb 17, 2019 8:18 pm

When ΔH > 0 and ΔS > 0, at high temperatures, reactions are spontaneous.
When ΔH < 0 and ΔS < 0, at low temperatures, reactions are spontaneous.
When ΔH < 0 and ΔS > 0, at all temperatures, reactions are spontaneous.
When ΔH > 0 and ΔS < 0, at all temperatures, reactions are non-spontaneous.


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