The elements Oxygen, Nitrogen, Silicon, Aluminum, Sodium, Calcium, Iron, Magnesium, Potassium and Titanium are the most common elements, questions, 1) Where can we find each of these elements? In what types of compounds can we find them? What are these compounds for?

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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.

"electrical energy" transforms to "thermal energy".hope my answer has you : )