Can someone tell me what the answer for 7 and 8

7; the subscript indicates the number of molecules of that particular atom in a molecule

8; The subscript would be 1. Since no subscript indicates 1.

Please brainliest

It is called a neutralization reaction

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.