Question

which answer below correctly identifies the type of change and the explanation for the heating of copper(ii) sulfate pentahydrate?
physical change because even though the change caused the temperature of the copper(ii) sulfate pentahydrate to increase, the compounds physical properties remained exactly the same
physical change because even though gas formation was observed, the copper(ii) sulfate pentahydrate was undergoing a state change, which means that its properties are preserved
chemical change because gas was released along with a color change, which indicated that the copper(ii) sulfate pentahydrate was transformed into a different substance
chemical change because a temperature change was observed, which indicated that the copper(ii) sulfate pentahydrate was transformed into a different substance

Explanation:

Chemical changes involve formation of new substances. Gas release and color - change during heating of copper(II) sulfate pentahydrate suggest new substance formation, indicating a chemical change.

Answer:

C. chemical change because gas was released along with a color change, which indicated that the copper(II) sulfate pentahydrate was transformed into a different substance