Is distilled water pure or impure

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Define the kinetic molecular theory