5. a) Sketch the energy vs. distance curve, U(r) for a covalent bond. Directly beneath the potential energy curve, sketch the corresponding force (F) vs. distance curve. (4) b) Label on EACH graph: i. the axes (2) ii. the equilibrium separation distance, ro (2) iii. the bond stiffness, So (2) b) Complete the following four mathematical relationships (4): au JU dr = OF dr |1='max F =10 dr =1 =10 c) Imagine you have two materials, A and B, with the following property relationships. A has a higher binding energy than B A has a higher mass density than B A has a lower thermal expansion coefficient than B A and B have the same crystal structure and similar molar mass On one graph, draw representative bond energy curves for materials A and B (4).