Question

Classify the following into physical changes and chemical changes:
(a) Rusting of an iron nail.
(b) Melting of butter
(c) Burning of wax candle
(d) Glowing of an electric lamp.

Answer 1

Answer:

rusting of iron and burning of wax is chemical change and melting of butter and glowing of a bulb is a physical change

Answer 2

Answer:

Physical change: burning of wax candle, melting of butter.

Chemical chance: glowing of electric lamp, rusting of an iron nail

Explanation:

wax and butter can get solidified on cooling

While,

rusting produces new substance called rust or Ironoxide

Glowing of an electric lamp produces heat, light,etc.