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Which type of energy from the sun is primarily required for the evaporation of water to occur?
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8. Thermochemistry
Nature of Energy
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As a substance gets cooler, what happens to the molecules within it?
A
The molecules increase in size.
B
The molecules move more slowly and have less kinetic energy.
C
The molecules gain electrons.
D
The molecules move more quickly and have more kinetic energy.
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Understand that temperature is a measure of the average kinetic energy of molecules in a substance.
Recall that as a substance cools, its temperature decreases, which means the average kinetic energy of its molecules decreases.
Recognize that kinetic energy is related to the speed of molecular motion; lower kinetic energy means molecules move more slowly.
Note that molecular size does not increase or decrease significantly with temperature changes; instead, the motion and energy of molecules change.
Conclude that as a substance gets cooler, the molecules move more slowly and have less kinetic energy.
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