The KM is: a. proportional to the standard free energy.
b. equal to the substrate concentration when the reaction rate is half its maximal value.
c. NONE OF THESE
d. ALL OF THESE equal to the product concentration at initial reaction conditions.

It’s c it stays the same. and the atomic number goes up by 1. a neutron has changed into a proton plus an electron. the electron is emitted as a beta particle.

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.