Is heat an extensive or intensive property? Is heat extensive or intensive property? 


I surfed the Internet for the same and found quite different answers. Like, heat is not a property, so it is neither. One said that since heat depends on the amount of substance, it is extensive. I thought about the latter one as well.

So, my question could be primarily divided into:

1. Is heat a property of matter?

2.1. If yes, is it extensive or intensive? Why?

2.2. If no, why?
In thermodynamics, heat is not a function of state but a process function. So for the question


  Is heat a property of matter?


the answer is no.


  ... is it extensive or intensive?


Since the concept of intensive and extensive properties only applies to physical properties that are a function of state, heat is neither intensive nor extensive.

As Chester said in the comments, it is worth noting that heat (as well as work) applied to a system can cause changes in the thermodynamic equilibrium state of the system.