Which of the following is an example of a reaction that you've seen in your everyday life ?
a. fire burning
b. water freezing
c. salt dissolving
d. ice melting

I believe this pertains to chemical reaction? So my guess would be answer A “Fire burning”

Don’t quote me though lol.

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.