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10 ShortEquilibriumLandscape

10 ShortEquilibriumLandscape - Concept of Equilbrium...

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FALL CH112 LRSVDS EQUILIBRIUM 1 Equilibrium is achieved when opposing processes proceed at equal rates. In chemical equilibria, forward and reverse reactions occur at equal rates. A B Forward reaction A ! B Rate= Reverse reaction B ! A Rate= At equilibrium, Concept of Equilbrium Concentrations of reactants and products do not change over time. Dynamic balance Reaching equilibrium may be slow ! FALL CH112 LRSVDS EQUILIBRIUM 2 Equilibrium does not tell you about the rate of the reaction. N 2 (g) + O 2 (g) 2NO(g) K ~10 -30 Therefore, 2NO(g) N 2 (g) + O 2 (g) K ~10 30 HOWEVER , NO(g) is stable at room temperature! ! What DOES affect equilibrium? 1. concentration 2. volume (if gases are involved) 3. temperature (changes the value of Kc) CATALYSTS affect the RATE of a reaction, but not K eq .
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FALL CH112 LRSVDS EQUILIBRIUM 3 Catalysts do not effect equilibrium concentrations . A B The value of the equilibrium constant K eq is NOT affected by the presence of a catalyst.
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