A student wishes to determine the density of water. The student places a graduated cylinder on an electric balance, and zeros the balance. The student then adds different volumes of water to the cylinder and records the mass of each. Question: Should the density the student calculates depend on the volume of water in the graduated cylinder? Explain.

The answer is true for your question.

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.