I understand activation energy to be the relative difference in energy between that of the activated complex/transition state (at some temperature) and the average energy of the reactants like shown here:
If this is correct, I have questions about graph like this one:
Is the location marked activation energy supposed to be the energy level of the transition state provided the energy axis is absolute?
Can the Maxwell-Boltzmann distribution be done for heterogeneous systems (i.e., two chemical reactants)?
Unrelated to the graph, why does negative activation energy result in a decrease in reaction rate (per Arrhenius equation)?