1. The problem statement, all variables and given/known data What is a state function? How is it different from a scalar quantity? Use the expression ΔH=q as an example. 2. Relevant equations 3. The attempt at a solution So the way I am interpreting this question is that a state function is a reference to say the temperature, pressure, and amount of a substance, not how the substance is aquired, its present state. A scalar quantity would be an amount of say temperature, making it pathway dependent. Using teh above equation, I believe that the H-final and H-initial are state functions, and their sum is a scalar quantity that is not a state function. I am really confused on this topic, any help would be much appreciated.