Understand that if a reversible reaction is exothermic in one direction, it is inevitably endothermic in the opposite direction.
Recognize that the exact same amount of energy is transferred in both the forward and reverse directions of a reversible reaction.
Describe the reversible reaction between hydrated copper sulfate (blue) and anhydrous copper sulfate (white) as a key example of a reaction involving opposing endothermic and exothermic energy transfers.
