Ineed this to get a great ! which choice is not a physical property of matter?

a. heat of combustion

b. viscosity

c. boiling point

d. melting point

This is what i found on google “according to the collision theory, the following criteria must be met in order for a chemical reaction to occur: molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. molecules must collide with the proper orientation.” i hope this information you.