AP Chemistryeasymcq1 pt
As two hydrogen atoms approach from far apart, what happens to the potential energy of the system before the bond forms?
A.It decreases
B.It increases
C.It stays constant
D.It first increases, then decreases
Explanation
Core Concept
Each electron becomes attracted to both nuclei, so the system's energy falls as the atoms near. The curve drops until the optimum distance, then rises if pushed closer by nuclear repulsion.
Correct Answer
AIt decreases
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