Question

what are chemical changes? give example

Answer 1

That is the Answer
Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.
Burning of wood is a chemical change.

Answer 2

THESE ARE THE CHANGES IN WHICH THE PHYSICAL PROPERTIES OF THE REACTANTS ARE ENTIRELY DIFFERENT FROM PRODUCT.THESE CHANGES ARE GENERALLY IRREVERSIBLE. EXAMPLE:COOKING OF FOOD,GROWTH OF PLANT.