The diagram shows the potential energy changes for a reaction pathway. (10 points) A curve line graph is shown. The y axis of the graph has the title Potential Energy. The x axis of the graph has the title Reaction Pathway. The curve begins at a lower level and ends at a slightly higher level. A vertical line labeled A, starts from the x axis till the beginning of the graph line. A vertical line labeled B starts from the x axis and continues till the peak of the graph. Another vertical line labeled C is shown from the x axis till the point where the curve ends.

Part 1: Describe how you can determine the total change in enthalpy and activation energy from the diagram, and if each is positive or negative.

Part 2: Describe how the curve will look if the reaction was exothermic. Be sure to mention changes in the potential energies of the reactants and products and the sign changes of the enthalpy.