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AP Chemistry
2.5 Lewis Diagrams
2.2 Intramolecular Force and Potential Energy
IntermediateMCQGraphicalConceptual21k
Draw a grayscale graph of potential energy versus internuclear distance. The horizontal axis is labeled \(r\) (pm), extends from 80 to 400, and has marked ticks at 142 and 199. The vertical axis is labeled potential energy (kJ/mol), extends from \(-300\) to \(+300\), and has marked ticks at \(-243\), \(-155\), and 0. A legend maps a solid curve to \(\text{F}_2\) and a long-dashed curve to \(\text{Cl}_2\). Use light gridlines through the marked ticks. Each curve rises steeply above \(+300\) at small separations, descends smoothly to one minimum, and approaches 0 from below at large separations. The solid minimum is exactly at \((142,-155)\); the long-dashed minimum is exactly at \((199,-243)\). Place one open circular marker at each minimum. No other curves, labels, text, or annotations appear.
Potential energy as a function of halogen internuclear distance
A student uses the potential-energy curves shown to compare the bonds in two halogen molecules. The zero of potential energy represents atoms that are completely separated from each other.

Which statement best interprets the graph and explains why the relative bond strengths do not follow the relative equilibrium bond lengths?

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