Describe how much solid NaHCO3 and water you would need to create a 25.0 mL of 0.100 M NaHCO3 solution. Assume the volume does not significantly change when adding the solute. Do the same for 25.0 mL of 0.100 M NaCl solution and 25.0 mL of 0.100 M KNO3 solution.

Ithink is d. physical property

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

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.

Idont really know sorry