JAMB - Chemistry (2003 - No. 2)
Which of the following is physical change?
Burning kerosene
Freezing ice cream
Exposing white phosphorus
Dissolving calcium in water
คำอธิบาย
Option A, C and D are irreversible but option B is reversible because the frozen ice cream can undergo melting and turn into liquid and vice versa, hence no new substance is formed.