MCAT Question of the Day
    •

    Q:

    		 As water evaporates from a surface, the surface cools. This is because:
    		 

    A

    		 water is always at a lower temperature than the surface.

    B

    		 the water absorbs energy from the surface for its ΔHvaporization as it evaporates.

    C

    		 the presence of water vapor in the air keeps surfaces cool.

    D

    		 the concentration of various contaminants increases, increasing the boiling point of the water and requiring more energy from the surface to evaporate.



    Thermochemistry |
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