On heating, blue copper(II) sulphate crystals gradually change to a white powder. Which of the following statements are correct?
(1)Heat would be liberated if water is added to the white powder.
(2)On further heating, the white powder would turn reddish-brown.
(3)A chemical change occurs during the heating of the blue crystals.
答案係 (1)同 (3) 可唔可以解釋一下點解 (1), (3)岩..(2)錯既?