Sulfur: Mineral or not mineral? Not mineral Mineral ​

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

What does that mean you dum bum

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.