Which two terms relate and why? compound, ion, proton

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.

Abbreviated as mg-25.

Ithink the answer is d

Pretty sure it's d. heterogeneous is separated by physical properties.