Transcription of Chapter 15 Chemical Equilibrium
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Chapter 15 Chemical Equilibrium
Chapter 15 Chemical Equilibrium * Note: On the AP exam, the required question has always been on Equilibrium . All possible types of Equilibrium will be discussed in chapters 15,16,17. Throughout these chapters, I will be giving you past AP Equilibrium questions. Chemical Equilibrium : The condition in a reaction when the concentrations of reactants and products cease to change. At this point opposing reactions are occurring at equal rates. Previous examples of Equilibrium : vapor pressure above a liquid is in Equilibrium with the liquid. The rate at which molecules of the gas phase strike the surface and become part of the liquid is equal to the rate in which molecules of liquid phase evaporate A saturated solution of ferrous alum: The rate at which the ions come out of solution as a solid equal the rate at which the ions dissolve (dissociate) I. The Concept of Equilibrium At Equilibrium , the rate of the forward reaction is equal to the rate of the reverse.
Equilibrium constants can also be expressed in terms of pressure. When the reactants and products in a chemical equation are gases, we can formulate the equilibrium expression in terms of partial pressures (usually in atms) instead of molar concentrations When using partial pressures, the equilibrium constant is Kp Kp = (PP) p(P Q) q-----
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