AP Chemistry Unit 5.6 Reaction Profiles AP PhysicsAP CalculusAP ChemistryAP Biology AP Chemistry-Concise Summary Notes- All Topics Reaction Profiles Activation energy: Activated Complex – Change in Reactants (peak – line)Transition state/Activated complex: bonds are partially formed (shown on curve’s peak)Activation energy of reverse reaction: Forward Activation Energy – ΔH/ ΔE (total energy change/energy released by the reaction) = distance from products and reactants; Hₚ – Hᵣ