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Unformatted text preview: Equilibrium Equilibrium In most of the chemical reactions that we have seen this semester, it appears as though all of the reactants are converted into products. In truth, many reactions do not convert all of the reactants into products. This is the case no matter how long you wait. Equilibrium An equilibrium is a balance between two opposing processes. It is reversible . Pb 2+ (aq) + 2Cl 1- (aq) ! PbCl 2(s) An equilibrium reaction is shown by the double arrow. The double arrow indicates that, at equilibrium, the forward reaction is occurring at the same rate as the reverse reaction. N 2 O 4(g) ! 2 NO 2(g) An equilibrium can be established for systems held under conditions of constant temperature, pressure and volume. If you change one of the conditions, the equilibrium shifts to compensate, to reestablish the equilibrium balance. Equilibrium This ability to shift to compensate for changes is called: A system at equilibrium will react to a stress in a way that counteracts the stress....
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