Spontaneous and unstable


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Hannah Pham 1D
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Joined: Fri Sep 28, 2018 12:19 am

Spontaneous and unstable

Postby Hannah Pham 1D » Sun Feb 24, 2019 11:44 pm

What's the difference between spontaneous and unstable?

Jack DeLeon 1B
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

Re: Spontaneous and unstable

Postby Jack DeLeon 1B » Mon Feb 25, 2019 12:12 am

spontaneous refers to the deltaG being negative in a reaction, which means that the reaction is product favored. not 100% sure how this is any different from an unstable reaction

Steven Garcia 1H
Posts: 79
Joined: Fri Sep 28, 2018 12:16 am

Re: Spontaneous and unstable

Postby Steven Garcia 1H » Mon Feb 25, 2019 12:33 am

Spontaneous usually means that delta G is negative, so you would expect the rxn in the forward direction to be favored (aka stable). An unfavorable rxn will have a positive delta G and therefore be unstable (products of rxn are unstable)

deepto_mizan1H
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Joined: Fri Sep 28, 2018 12:16 am

Re: Spontaneous and unstable

Postby deepto_mizan1H » Mon Feb 25, 2019 10:26 am

Our spontaneity can help us to conceptually understand what stability means. In essence; the spontaneous reaction which increases the entropy of the universe is most favored. This can be considered a value of stability, as the reaction ends up being universally favorable. The opposite reaction would be non-spontaneous, and have an opposite effect on entropy. So, it wouldn't be a very stable result.

Aarti K Jain 1L
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

Re: Spontaneous and unstable

Postby Aarti K Jain 1L » Mon Feb 25, 2019 12:18 pm

A thermodynamically stable compound will have a negative standard Gibbs free energy of formation, meaning that it is spontaneous.

A thermodynamically unstable compound will have a positive standard Gibbs free energy of formation, meaning that it is non-spontaneous.


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