alleryStart learning →What name is given to the spreading of gas molecules from a region of high concentration to one of low concentration?
ADiffusion
BEffusion
CConvection
DCompression
Answer & Solution
Correct answer: A. Diffusion
1. Gas molecules move randomly and are unaware of any concentration gradient.
2. A crowded region simply has more particles to send outward than a thin region has to send back.
3. The net drift from crowded to thin that results is called diffusion.
4. Effusion is a different process, the escape of gas through a tiny hole rather than spreading through open space.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.4 Effusion and Diffusion of Gases_
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