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A liquid is left in an open dish. After several days, there is less liquid...

Physics
WAEC 2023

A liquid is left in an open dish. After several days, there is less liquid in the dish. Which of the following statements explains this observation? The

  • A. most energetic molecules leave the surface and escape into the air.
  • B. least energetic molecules leave the surface and escape into air.
  • C. most energetic molecules leave the surface and return.
  • D. least energetic molecules leave the surface and return.
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Correct Answer: Option A
Explanation

The statement that explains the observation is:

The most energetic molecules leave the surface and escape into the air.

This phenomenon is known as evaporation. In a liquid, molecules have varying energies, and the molecules with higher kinetic energies (the most energetic ones) are more likely to overcome the attractive forces within the liquid and transition into the gaseous phase. These molecules escape from the surface of the liquid into the air, gradually reducing the amount of liquid in the open dish. Evaporation is a process that occurs continuously as long as there is a liquid exposed to the air.


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Join your school's WhatsApp group
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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