Is pulverizing an aspirin a physical or chemical process

It is physical, because a chemical change would mean that somehow the aspirin has changed its chemical make-up. The aspirin is still aspirin, it's just physically different.

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.