spontaneous reactions
Moderators: Chem_Mod, Chem_Admin
-
- Posts: 52
- Joined: Wed Nov 21, 2018 12:19 am
spontaneous reactions
What exactly does a reaction being spontaneous mean in terms of thermodynamics, and what occurs when ∆S and ∆H are either both negative or both positive?
-
- Posts: 103
- Joined: Wed Sep 11, 2019 12:16 am
Re: spontaneous reactions
A spontaneous reaction means it will tend to occur under the given conditions without an outside source of energy. Note that it says nothing about the speed of the reaction!
When ∆S and ∆H are either both negative or both positive, that is when the temperature dependence of the reaction becomes very important, as the magnitude of T will determine whether the reaction will be spontaneous.
Hope this helps!
When ∆S and ∆H are either both negative or both positive, that is when the temperature dependence of the reaction becomes very important, as the magnitude of T will determine whether the reaction will be spontaneous.
Hope this helps!
-
- Posts: 108
- Joined: Sat Sep 28, 2019 12:15 am
Re: spontaneous reactions
A negative delta S means that the reverse reaction is spontaneous. A positive delta S means that the forward reaction is spontaneous. A negative delta H means that it is exothermic and usually exothermic reactions are associated with being spontaneous because they release energy.
Return to “Gibbs Free Energy Concepts and Calculations”
Who is online
Users browsing this forum: No registered users and 1 guest