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AP Chemistry
2.2 Intramolecular Force and Potential Energy
IntermediateMCQGraphicalConceptual23.7k
A potential energy graph plotted on grayscale axes. The horizontal axis is labeled Internuclear Distance (pm). The vertical axis is labeled Potential Energy (kJ/mol), with a horizontal dashed reference line indicating 0 kJ/mol. A solid black curve is labeled Cl2; its minimum lies in the negative potential energy region at (200 pm, -240 kJ/mol). Four dashed curves are labeled Curve W, Curve X, Curve Y, and Curve Z. Curve W has a minimum at a smaller internuclear distance and a more negative potential energy than Cl2. Curve X has a minimum at a larger internuclear distance and a less negative potential energy than Cl2. Curve Y has a minimum at a larger internuclear distance and a more negative potential energy than Cl2. Curve Z has a minimum at a smaller internuclear distance and a less negative potential energy than Cl2. No other curves, gridlines, labels, or annotations appear.
Potential energy as a function of internuclear distance for \(\text{Cl}_2\) and candidate curves for \(\text{Br}_2\).
The potential energy of a system of two chlorine atoms as a function of internuclear distance is represented by the solid curve labeled \(\text{Cl}_2\) in the graph below.

Which of the dashed curves best represents the potential energy of a system of two bromine atoms, \(\text{Br}_2\), as a function of internuclear distance, and why?

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