Hydrated copper sulphate is a blue crystalline solid. when heated, it changes to anhydrous copper sulphate, a white powder. what occurs in that process? ( a. loss of water. ( b. absorption of water. ( c. loss of oxygen. ( d. oxidation

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.