Asystem in a chemical equilibrium a. has particles that don’t move b. responds to minimized change c. is undergoing visible change. d. is stable only when all of the reactants have been used

d

Explanation:

chemical equilibrium is a state in which their is not observable change in the system of reaction

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons