An exentropic reaction is one where there is an increase in entropy; meaning, there's more disorder after the reaction than before it.
Think about cleaning your room then throwing a wild party. Beforehand, everything was neat (low entropy), but after the party, things are scattered everywhere (high entropy). The party represents an exentropic reaction because it increased disorder.
Exothermic Reaction: A chemical reaction that releases heat into its surroundings.
Spontaneous Reaction: A reaction which will proceed without any outside energy input.
Chemical Equilibrium: The state where both reactants and products are present in concentrations which have no further tendency to change with time.
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