Chemistry Unit 2 - Equilibrium

Chemistry Unit 2 - Equilibrium - Chemistry Unit 2:...

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1 Chemistry Unit 2: Equilibrium Assumes chemistry of system does not change with ________. Chemical reactions are governed by equilibrium coefficients and  the Law of Mass Action  (LeChatlier’s Principle):                           aA + bB <–> cC + dD               K eq = Equilibrium models provide good estimates when reactions occur quickly:  acid/base  complexation with metals  redox   solids (prepcipitation, dissolution, adsorption) Reading: pp. 39-56, 69-75 b a d c {B} {A} {D} {C} This is sometimes called the “Equilibrium” approach and is to be distinguished from the “Kinetic” approach (later) This is the reaction “Stoichiometry” – the recipe for the reaction as defined by a, b, c, and d
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2 Qualitative: LeChâtlier’s Principle A system at equilibrium, when subjected to a perturbation,  responds in a way that tends to eliminate its effect. If you add a chemical that is on the left hand side of the  equation, the reaction will proceed towards the right.  And  vice versa. In the natural environment, we use equilibrium to try and understand what is going on. In Engineered Reactors, we are trying to destroy equilibrium
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3                           aA + bB <–> cC + dD                              v f  = k f {A} a {B} b        v r  = k r {C}
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Chemistry Unit 2 - Equilibrium - Chemistry Unit 2:...

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