How long does helium last in latex balloons

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

Can someone me with questions 12 and 13 plz.

Match the mixture with the substance// i really need on this guys (it’s a pic btw)