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.

Many free radicals combine to form molecules that do not contain any unpaired electrons. the driving force for the radical–radical combination reaction is the formation of a new electron‑pair bond. consider the chemical equation. n(g)+no(g)⟶nno(g) n(g)+no(g)⟶nno(g) write lewis formulas for the reactant and product species in the chemical equation. include nonbonding electrons. n(g)n(g) select draw rings more erase select draw rings more erase select draw rings more erase n no(g)