When you run an electrical current through liquid water, the water molecules are split apart to form oxygen and hydrogen gas. the transfer of energy caused what kind of change to the water?

The answer is "chemical properties". The original water is split apart by the current 
to form its constituent elements, hydrogen & oxygen. This is a chemical change, as 
the original water is lost and new substances, H2 & O2, are produced. 
Hope this answers your question.

Ci think not

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.