A change in which one or more new substances are formed is called chemical change. It is also known as chemical reaction.
Eg:- Medicines, plastic, detergent etc are produced by chemical change.
In addition to new products other changes can occurs in a chemical change which are given below:
(i)Heat, light or any other radiation may be given off or absorbed.
Eg:-Burning of any substance
(ii) Sound may be produced.
Eg:- Explosion of fireworks that produces light, heat, sound and gases.
(iii)A change in smell may take place or a new smell may be given off.
Eg:-Rotten food items produce smell.
(iv) A colour change may take place.
Eg:- colour of apple, potato and brinjal slice changed to brown if it is not consumed immediately.
(v) A gas may be formed.
Eg:- Explosion of fireworks, candle flame produces gas.