Chemical_Equilibrium - The Equilibrium Condition...

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The Equilibrium Condition Equilibrium is not static, but is a highly dynamic state. At the macro level everything appears to have stopped but at the molecular level, there is frantic activity. The concentration of products builds as the reaction proceeds. There will come a time, in some reactions, where the products will collide and thus react and reform the reactants. When both the forward and reverse reaction occur at the same rate there is no change in concentration reactants and products and the reaction is said to be at equilibrium. A double arrow ( ) is used to show that a reaction can occur in either direction. The Equilibrium Constant Let us use the following equation: j A + k B m C + n D where A, B, C, and D represent chemical species and j, k, m, and n are their coefficients in the balanced equation. Since the concentration of the products and reactants remains constant at equilibrium, we can set up a mass action expression : Which is the concentration of the products (raised to the power of their coefficients) divided by the concentration of the reactants (raised to the power of their coefficients). This mass action expression can then be used to find a constant for the reaction at a given temperature.
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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Chemical_Equilibrium - The Equilibrium Condition...

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