brea kin g of a glass bottle and burning of a matchstick are both irreversible changes.what is the difference between the two,when we cannot get back the original object in both the cases. 

Hi,

Breaking of glass bottle is an irreversible physical change as it does not changes chemical structure of glass while burning of match stick changes the phosphorus of match stick to another compound by combining with oxygen in air. Thus it is a irreversible chemical change.

Hope it helps.

Cheers!