Analysis: In each case, refer to the figure or table to answer each of the following short answer questions, Remember to support your ideas using evidence and examples. 20. Sample Reaction A proceeds based on the enthalpy change diagram shown in Figure 1, below. a) Using vocabulary terms and unit concepts, name and explain all parts labelled by a letter in this diagram. b) Indicate whether the enthaipy value would be negative or positive and why. ( 3 marks) Figure 1: Enthalpy change over time for A