The rate constant for a particular second-order reaction is 0.47 M-1 s-1 . If the initial concentration of reactant is 0.25 mol/L, it takes s for the concentration to decrease to 0.13 mol/L

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.

Answeramino acids;

Answer ozone (o3) is made of three atoms of oxygen, it is a molecule;

The answer is solid copper