Define and discuss activation energy. Relate it to the minimum energy needed to react. Discuss the effects on the rate of reaction when activation energy is low and when it is high. Use example of Nitrogen dioxide combing with carbon monoxide to form nitrogen monoxide and carbon dioxide. View and analyze the reaction rate graph. Define on the graph the transition states, the activation energy and the heat of reaction. Show the difference between an endothemic and exothermic reaction graph.