Draw two reaction-energy profiles, one for an endothermic reaction \(\mathrm{A}\) and one for an exothermic reaction B. Make the profile for B represent the faster reaction by drawing the two \(E_{\mathrm{a}}\) barriers to scale.

Endothermic reactions are chemical reactions where energy, usually in the form of heat, is absorbed from the surroundings. These reactions cause the energy level of the products to be higher than the energy level of the reactants. On the other hand, exothermic reactions are chemical reactions where energy is released into the surroundings, usually as heat. These reactions cause the energy level of the products to be lower than the energy level of the reactants.

To plot each reaction-energy profile, we'll follow these steps: 1. Draw the x-axis representing the reaction coordinate and y-axis representing the potential energy (\(E_{\mathrm{p}}\)). Label the axes. 2. For reaction A: a. Draw a curve starting from reactants with lower potential energy, moving to a higher energy level for the activated complex, and finally settling at a higher energy level for the products. Label the reactants, activated complex, and products. b. Calculate and label the energy activation barrier (\(E_{\mathrm{aA}}\)), which is the difference in potential energy between the reactants and the activated complex. c. Calculate and label the enthalpy change (\(\Delta H_A\)), which is the difference in potential energy between the reactants and the products. 3. For reaction B: a. Draw a curve starting from reactants with higher potential energy, moving to a lower energy level for the activated complex and finally settling at a lower energy level for the products. Label the reactants, activated complex, and products. b. Calculate and label the energy activation barrier (\(E_{\mathrm{aB}}\)), which is the difference in potential energy between the reactants and the activated complex. Make \(E_{\mathrm{aB}}\) smaller than \(E_{\mathrm{aA}}\) to represent reaction B as the faster reaction. c. Calculate and label the enthalpy change (\(\Delta H_B\)), which is the difference in potential energy between the reactants and the products. After performing these steps, you should have two reaction-energy profiles drawn for both endothermic (reaction A) and exothermic (reaction B) reactions, indicating the energy activation barriers (\(E_{\mathrm{aA}}\) and \(E_{\mathrm{aB}}\)) and the enthalpy changes (\(\Delta H_A\) and \(\Delta H_B\)). Furthermore, reaction B should have a smaller energy activation barrier compared to reaction A, representing it as the faster reaction.