Final answer:
Anhydrous copper sulfate forming a solution in water is an exothermic process, which leads to an increase in temperature due to the release of heat.
Step-by-step explanation:
When anhydrous copper sulfate is added to water, a solution forms, and heat is given out. This indicates an increase in temperature and that the reaction is exothermic. An exothermic reaction is one that releases heat, leading to a rise in temperature of the surrounding environment. In the case of copper sulfate, the solid crystals absorb water and release heat during the formation of a hydrated compound, which is observable as a temperature increase, demonstrating this character of chemical reactions.