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As water evaporates from an open container at 40°C, which one of the following is true?

(a) The water becomes warmer as the kinetic energy of the liquid water molecules
increases.
(b) The water molecules decompose into hydrogen and oxygen molecules.
(c) The water molecules return to the surface as fast as they leave.
(d) The water vapour molecules have greater kinetic energy than the liquid water
molecules.

Sagot :

AL2006
The vapor molecules have greater KE than the liquid ones have. That"s how they break free of the liquid and waft away.
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