A fan is plugged into the wall. When the fan is running, the moving air makes
noise. What kind of energy conversion is taking place?

A. Heat energy to chemical energy

B. Mechanical energy to chemical energy

C. Light energy to heat energy

D. Electrical energy to sound energy

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.

Ithink about 50 % of an original isotope's number of atoms remain

Fake and a real . . . . . ..

3-isopentane; 3-methylbutane, and 1,2-methylpropane do not meet iupac rules, so they are wrong names.the only valid name onthe list is 2-methylbutane, which is the same isopentane.this is its formula:                   ch2                    |ch3 - ch - ch2 - ch3answer: 2-methylbutane