What is true of a physical change? 1) results in a rearrangement of the elements that make up the substance 2) results in a substance that is still the same substance 3) results in a substance with completely different physical properties 4) results in a new substance that is not the same substance

Option 2 is the correct one

C) electrons encircling a nucleus with neutrons and protons

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.