The chemical equilibrium is reached when the rate of the forward reaction equals the rate of reverse reaction. The principle of conservation of mass says that the total amount of any given substance always stays constant, which is why chemical equilibrium can be reached. Number: __ Bullet Point: – Chemical Equilibrium occurs when both forward and reverse reaction rates are equal. The rate at which a molecule will react is based on its concentration in solution, or activity coefficient (see below). When the concentrations vary greatly from very high to very low values, there may not be an exact equivalence between forward and backward reactions because it takes time for molecules to enter into their lower-concentration forms before they can participate in another round of diffusion back up through higher-concentrations levels. When this happens, we say that “kinetic control” of the reaction has occurred. The principle of conservation of mass says that the total amount of any given substance always stays constant, which is why chemical equilibrium can be reached. __ Number: __ Bullet Point: – Chemical Equilibrium occurs when both forward and reverse reaction rates are equal. The rate at which a molecule will react is based on its concentration in solution, or activity coefficient (see below). When the concentrations vary greatly from very high to very low values, there may not be an exact equivalence between forward and backward reactions because it takes time for molecules to enter into their lower-concentrations forms before they can participate in another round of diffusion back up through higher-concentrations levels.

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