When a chemical system is at equilibrium, Multiple Choice the forward and reverse reactions have stopped. the concentrations of the reactants are equal to the concentrations of the products. the concentrations of the reactants and products have reached constant values. the reaction quotient, Q, has reached a maximum.

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.