Why does decrease of temperature increase spontanity of a reaction?

[sameeralord]

Hello everyone,

I always though when reactants are heated up, there are more collisions and more like a reaction is to take place. However this is not the case for spontaneous reaction according to Gibbs equation. Why is that? Thanks

 

[Mapes]

I'm not sure how you've reached this conclusion. At constant temperature and pressure, reactions with a negative value of $\Delta G=\Delta H-T\Delta S$ are spontaneous. Since the entropy of a reaction can be positive or negative, we can't say anything absolute about the influence of temperature on spontaneity.

 

[pzona]

Not true, it all depends on the relative magnitudes (and signs) of the enthalpy and entropy terms. Here's a video I found a while back; it does a pretty good job of explaining the equation in intuitive terms.