Introduction to Reversible Reactions and Equilibrium

This video explains the concept of reversible chemical reactions. It starts by introducing reversible reactions and providing an example of the reaction between ammonium chloride, ammonia, and hydrogen chloride. The video then explains how reversible reactions are represented by an equation with a symbol in the middle and how they have a point called equilibrium where the forward and reverse reactions occur at the same rate. The video also highlights that if a reversible reaction is exothermic in one direction, it will be endothermic in the reverse direction. The video also shows diagrams to illustrate the thermal decomposition of ammonium chloride and the subsequent reaction between ammonia and hydrogen chloride to reform ammonium chloride, and how the relative amounts of reactants and products remain constant at equilibrium.