AP Chemistryhardmcq1 pt
Which particles in a liquid have enough energy to escape into the vapor phase?
A.The fastest-moving molecules at the surface
B.The slowest molecules at the bottom
C.All molecules equally
D.Only ionized molecules
Explanation
Core Concept
Kinetic energies follow a distribution; only molecules in the high-energy tail, and near the surface, can overcome attractions and leave. Evaporation selectively removes fast molecules, cooling the liquid.
Correct Answer
AThe fastest-moving molecules at the surface
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