physical change because even though the change caused the temperature of the copper(II) sulfate pentahydrate to increase, the compound’s physical properties remained exactly the same
B
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
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
D
chemical change because a temperature change was observed, which indicated that the copper(II) sulfate pentahydrate was transformed into a different substance