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### Spontaneous

Posted: Tue Feb 11, 2020 10:37 pm
How do we determine if a reaction is spontaneous? What does having a Gibbs free energy of 0 mean relative to the energy of the reaction?

### Re: Spontaneous

Posted: Tue Feb 11, 2020 10:40 pm
A reaction will be spontaneous if the change in Gibbs Free energy is a negative value. A reaction will not be spontaneous if the change in Gibbs Free energy is a positive value.

### Re: Spontaneous

Posted: Tue Feb 11, 2020 10:48 pm
You can look at the sign of delta g. If it is negative its spontaneous if its positive its not.

### Re: Spontaneous

Posted: Wed Feb 12, 2020 1:24 pm
a negative delta G (corresponding to a positive delta S) correlates to a spontaneous reaction, while a positive is vice versa. If the delta G is 0, the system will have reached equilibrium, and the forward and backward rates are the same.

### Re: Spontaneous

Posted: Wed Feb 12, 2020 9:29 pm
professor lavelle said that every time we're asked whether or not something is spontaneous we know that delta g has to be negative. that's it really.

### Re: Spontaneous

Posted: Wed Feb 12, 2020 9:34 pm
When deltaG (free energy available to do work) is negative!

### Re: Spontaneous

Posted: Thu Feb 13, 2020 12:04 am
The sign of Gibb's free energy determines the spontaneity of a reaction.

### Re: Spontaneous

Posted: Thu Feb 13, 2020 1:21 am
A negative delta G value or a positive detla S universe (total) value.

### Re: Spontaneous

Posted: Thu Feb 13, 2020 2:40 am
A reaction that is spontaneous will have a negative Gibbs free energy, while a reaction that has a Gibbs free energy is in equilibrium.

### Re: Spontaneous

Posted: Thu Feb 13, 2020 8:40 am
If the change in gibbs free energy is negative, the reaction is spontaneous. If it is positive, it is not. It the change in gibbs free energy is equal to 0, the reaction is in equilibrium.

### Re: Spontaneous

Posted: Thu Feb 13, 2020 8:59 am
If our delta g is negative then the reaction is spontaneous in the forward direction.

### Re: Spontaneous

Posted: Thu Feb 13, 2020 10:45 am
It delta G is positive it means the reaction is spontaneous in the reverse direction.

### Re: Spontaneous

Posted: Wed Feb 19, 2020 11:59 pm
DeltaG's sign determines spontaneity. If positive, not spontaneous; if negative, spontaneous; if =0, at equilibrium.

### Re: Spontaneous

Posted: Thu Feb 20, 2020 9:48 am
A reaction will be spontaneous if the Gibbs free energy value is negative. So to find that point you would set the equation to zero to solve and then say that all values less that the one you find will make the reaction spontaneous.

### Re: Spontaneous

Posted: Thu Feb 20, 2020 11:25 am
When the change in Gibbs Free Energy value is negative, then we can know that the reaction is spontaneous and proceeding towards the products. If it is a positive change, then the reaction is not favorable or spontaneous and proceeds towards reactants.

### Re: Spontaneous

Posted: Thu Feb 20, 2020 11:32 am
A reaction is spontaneous if it has a negative delta G (meaning it also proceeds in the forward direction towards the products). When delta G is 0, the reaction is at equilibrium since the free energy of the products equals the free energy of the reactants and no more work can be done.

### Re: Spontaneous

Posted: Thu Feb 20, 2020 11:50 am
If the delta G value is negative, then it is spontaneous toward the forward direction.

### Re: Spontaneous

Posted: Sun Feb 23, 2020 3:19 pm
If DeltaG is less than 0 at a certain composition of the reaction mixture, then the forward reaction is spontaneous. If DeltaG is greater than 0 at a certain composition of the reaction mixture then the reverse reaction is spontaneous.

### Re: Spontaneous

Posted: Sun Feb 23, 2020 3:39 pm
If deltaG is equal to 0, than the reaction is at equilibrium, and not proceeding in either direction.

### Re: Spontaneous

Posted: Sun Feb 23, 2020 3:50 pm
if delta G is less than 0, that means the reaction is spontaneous. You can also think of spontaneity in terms of the equation delta G= delta H - T*Delta S in order to assess which values of delta H and delta S can produce a spontaneous reaction with a negative delta G.

### Re: Spontaneous

Posted: Sun Feb 23, 2020 4:01 pm
When delta G is negative the reaction is spontaneous, but when delta G is positive the reaction is not spontaneous. When delta G is equal to 0 then the reaction is not spontaneous because it is at equilibrium.

### Re: Spontaneous

Posted: Sun Feb 23, 2020 4:11 pm
In order for a reaction to be considered spontaneous, the value of delta G must be a negative number. delta g = delta H - TDELTAS. If delta g is 0, the reaction is at equilibrium.

### Re: Spontaneous

Posted: Sun Feb 23, 2020 4:13 pm
Here is an image that can help!

### Re: Spontaneous

Posted: Sun Feb 23, 2020 6:10 pm
Gibbs Free Energy being at zero signals that the reaction is at equilibrium