Reversible Reactions can be both Exothermic and Endothermic.
- An example of a reaction like this is the Thermal Decomposition of hydrated copper sulfate:
Hydrated copper sulfate = (reversible reaction symbol) anhydrous copper sulfate + water
If you heat blue hydrate copper sulfate crystals, it evaporates the water from it (you can collect this by using a cooling system to condense the water vapor) and leaves white anhydrous copper sulfate crystals. Then when you pour the water back onto the white crystals, they turn back into the blue hydrated copper sulfate crystals.
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