Virtual Learning Academy Charter School

• SCIENCE 140

• Worksheet It is time to practice using potential energy diagrams. Respond to the three questions below on energy diagrams and submit to your instructor. 1. Consider the potential energy diagram shown below. This graph shows the chemical potential energy in a reaction system over time. The y-axis is potential energy in kilojoules. The x-axis is the reaction progress, or time. a. Does this graph represent an endothermic or an exothermic reaction? Explain your answer. It is an endothermic reaction because the products have more potential energy than the reactants. The reactants from the graph is 50kJ, the activating complex is 250 kJ which means that there is a 200kJ activation energy needed to get the reaction started and resulting to a product of 200kJ. This means that the final energy is +150 kJ. It is seen that reactants energy is less tha