*will mark brainliest and give 40 points* * be fully detailed *

the diagram shows the potential energy changes for a reaction pathway.

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: does the diagram illustrate an endothermic or an exothermic reaction? give reasons in support of your answer.

part 2: describe how you can determine the total change in enthalpy and activation energy from the diagram and if each is positive or negative.