Answer the case-based question:
Knowing that matters can change its states; when a state change occurs, the properties of substances also change. Similarly, if the state change is reversed, the substance will recover the properties which it had before.
Helen placed ice and wax on a hot plate. After a while both got melted. But, ice got melted quick compared to wax.
i. What change is taking place when wax and ice are placed in hot plate?
ii. Why do both substances melt at different times even when placed on the same hot plate?
iii. What is the melting point and boiling point of water?