Spontaneous Reactions


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Jessica Castellanos
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Spontaneous Reactions

Postby Jessica Castellanos » Mon Feb 10, 2020 3:31 pm

How do you know if a reaction is spontaneous? Do you look at entropy or Gibbs free energy? Both?

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Re: Spontaneous Reactions

Postby MAC 4G » Mon Feb 10, 2020 3:52 pm

I think you want to look at whether or not Delta G is negative for spontaneity that is accounted for entropy * T is larger than delta H.

The equation for delta G = delta H - TdeltaS
So, even if delta H and delta S are positive, increasing the temperature to make the term TdeltaS larger than delta H would then make delta G negative meaning it is spontaneous.

Maya Pakulski 1D
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Re: Spontaneous Reactions

Postby Maya Pakulski 1D » Mon Feb 10, 2020 4:03 pm

You look at the value for deltaG. If deltaG is negative it is spontaneous and if it is positive it is not spontaneous. Similarly there was a question about whether a compound would be stable or unstable based on its deltaG value and if the value is negative the compound is stable, is the value is positive the compound is unstable.

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