Question

why burning may and may not be a desirable change​

Answer 1

Answer:

A chemical change is the process in which chemical composition of the substance is changed,and physical composition may or may not changed burning of coal that is carbon(C) in presence of oxygen gives a different chemical substance $$CO_2$$. So, it is a chemical change.

Answer 2

Answer:

Burning might not be a desirable change

Explanation:For example, burning of fuel, melting of wax, breaking of stones, making of ice-cream, etc. Question Is burning always a desirable change? Burning of wood or coal in our homes is a desirable change as it is useful to us.........but in some cases undesirable situation occur. For eg. Melting of icecream and burning of something unintentionally.......hope it helps