At the elevated temperatures found in car engines, nitrogen reacts with oxygen to produce nitrogen monoxide. $\tfrac{1}{2}\text{N}_2(g) + \tfrac{1}{2}\text{O}_2(g) \rightarrow \text{NO}(g) \quad \Delta H^\circ = +90\,\text{kJ mol}^{-1}$ This reaction has activation energy $E_a$. Which reaction pathway diagram could show this reaction correctly?
Chemistry 9701 · AS & A Level · Reaction kinetics