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AP Chemistry
2.2 Intramolecular Force and Potential Energy
BeginnerMCQGraphicalConceptual18.4k
Draw a grayscale Cartesian graph with no gridlines. The horizontal axis is labeled “Internuclear distance, r (pm)” and runs from 30 to 400, with ticks at 50, 74, 100, 200, 300, and 400. The vertical axis is labeled “Potential energy, U (kJ/mol)” and runs from -500 to +800, with ticks at -436, 0, 400, and 800. Plot one solid curve that begins near +750 at 30 pm, drops steeply, crosses the zero level near 52 pm, reaches a smooth minimum at 74 pm and -436 kJ/mol, then rises gradually while remaining below zero and approaching zero asymptotically by 400 pm. Place an open circular point labeled P on the curve at 300 pm and a filled circular point labeled Q at the minimum. Add a small directional arrow along the curve from the open point toward the filled point. No other curves, labels, text, or annotations appear.
Potential energy of two hydrogen atoms versus internuclear distance.
A student analyzes output from a computational model of the potential energy of two \(\text{H}\) atoms. The zero of potential energy corresponds to atoms separated by an effectively infinite distance. Point P represents a large separation, and point Q represents the equilibrium \(\text{H}-\text{H}\) bond distance.

As the atoms move from point P toward point Q, which statement best describes the potential energy of the two-atom system?

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