[spunkets]

"The Gibbs free energy is just -T times the entropy change, at constant pressure. It's just a proxy for the total entropy."

Since I mentioned reactions I thought it was clear, but...

delG = delH -T*delS

The enthalpy, or heat of reaction is larger than T*delS and what drives "the signal".

[spunkets]

Sufficient delH also can reduce S...

[Right Wing Professor]

delG = delH -T*delS

S in that equation is the system entropy. There is also the entropy of the surroundings. The entropy change in the surroundings is -q_rev/T, and since the reversible heat at constant pressure equals the enthalpy change Delta H, DeltaH = -T DeltaS_surr. So DeltaG = -T(S_surr+S_sys)