Unit 5 – Reaction Rates Factors Affecting Equilibrium: Le Châtelier’s Principle A. Le Châtelier's Principle 1. When a closed system at equilibrium is disturbed by application of a stress, it attains a new equilibrium position that minimizes the stress B. Equilibrium and System Stresses – Predicting the direction of shift 1. Pressure a. An increase in pressure will cause the reaction to shift in the direction that result in fewer collisions – toward the side of the reaction with the least number of moles of gas molecules N 2 (g) + 3H 2 (g) 2NH 3 (g) An increase in pressure causes the equilibrium position to shift to the right, where there are only two moles of gas. The left side has four moles of gas b. Decreases in pressure cause the reaction to shift in the direction that increases collisions; toward the side with more moles of gas
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