During the day, the temperature of the sand in a desert rises as the sand is heated by the sun. after the sun sets, the sand cools. what happens to the heat energy in the sand as it cools?
a) it is destroyed.
b) it is used by the sand to do work.
c) it goes back into the sun, completing the cycle.
d) it is transferred to the air via the process of radiation.

Why do the strengths of london (dispersion) forces generally increase with increasing molecular size? choose one: a. heavier atoms have stronger attractions for each other than lighter atoms. b. dispersion forces are all equal in magnitude; there is no size dependence. c. dispersion forces arise from the attraction between the nuclei of atoms, and larger molecules have larger nuclei. d. dispersion forces arise from dipoles caused by the electron distribution being distorted. larger molecules have more electrons and, therefore, more distortions and a bigger force. e. dispersion forces depend on distance. larger molecules are farther apart and so the forces are smaller.