Chemistry - Thermochemistry - Exothermic and endothermic reactions - Energy Diagrams

Slider toggles between exothermic and endothermic energy profile diagrams. LEFT (Exothermic): Y-axis = Energy, X-axis = Reaction progress. Reactants start HIGH, products end LOW. The drop = energy released (ΔH < 0). Arrow pointing DOWN labeled 'Energy released to surroundings'. The hump between = ac