Question

When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.

Answer 1

Physical Changes: On heating, candle wax gets melted is a physical change. Since it again turns into solid wax on cooling.

Chemical Changes: The wax near to flame burns and gives new substances like Carbon Dioxide, Carbon soot, water vapour, heat and light. Cooking of food, is another example where both physical and chemical changes occurs.