What phase change corresponds to each of the following, e. g. solid to liquid. a. heat of vaporization b heat of fusion

As you indicate;

Solid to liquid is Heat of fusion !

The answer is Because think you were changing and in it’s in its name phase change to changing from a solid to a liquid

Ithink 2.2 ibs i think i learned a bit about it

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.