Question

which of the following is a chemical change ? (a) evaporation of water. (b) burning of fuels (c) moving of a wheel (d) breaking of a brick​

Answer 1

Answer: it is (b) burning of fuels as it's chem. composition changes

after burning the fuel

Answer 2

Explanation:

Burning of the candle is actually chemical change. Wax is basically made up of hydrocarbons.Flame burns and gives new substances like carbon dioxide, carbon soot, water vapours, heat and light

The breaking of brick, Evaporation of a liquid and Moving of a wheel are physical changes because chemical composition remains same.