A child holds a a 12.8 kg ball at a height of 3.3 m. The child then drop the balls, what is the kinetic energy just before the ball hits the ground?
414 )
42J
70
125 J

They are all decomposition reactions.

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.