PPT-Shifting Equilibrium Applications Involving the Equilibrium Constant

The Meaning of K K gt 1 the equilibrium position is far to the right K lt 1 the equilibrium position is far to the left The value of K for a system can be calculated from a known set of equilibrium concentrations . 2.1 Chemical Equilibrium (and Equilibrium Constant). 2.2 Calculations using Kc expressions. 2.3 Effect of changing conditions on equilibria. Chemical Equilibrium. Describe the term chemical equilibrium.. Reactions are reversible. A + B C + D ( forward). C + D A + B (reverse). Initially there is only A and B so only the forward reaction is possible. As C and D build up, the reverse reaction speeds up while the forward reaction slows down.. AP . Chem. Mr. Nelson. The Concept of Equilibrium. The term . reversible reaction . is used to describe reactions that can go in either the forward or the reverse direction. Equilibrium. is used to specify that a reversible reaction has reached an . Dr. Ron Rusay. © Copyright 2003-2010 R.J. Rusay. Chemical Equilibrium. The reactions considered until now have had reactants react completely to form products. These reactions “went” only in one direction.. Author: Wesley Tung. Technical Things. A chemical equation of a reaction uses mole ratios to describe the production of products from reactants.. In . , hydrogen and oxygen are reactants, and water is a product.. A . reversible reaction . can be approached from either direction. In a . closed system. , no reactants or products can enter or escape. For equilibrium to be achieved, a reaction must be . reversible. Measuring Equilibrium Concentrations. Equilibrium Calculations (ICE Charts). Qualitatively Interpreting the Equilibrium Constant. Meaning of Small Equilibrium Constant. SCH4U – Grade 12 Chemistry, University Preparation. Honors . Chemistrry. Enloe. High School. Chemical Equilibrium. Condition which the concentrations of all reactants and products in a closed system cease to change with time. Occurs when opposing reactions are proceeding at equal rates. James F. Kirby. Quinnipiac University. Hamden, CT. Lecture Presentation. The Concept of Equilibrium. . Chemical equilibrium. occurs when a reaction and its reverse reaction proceed at the same rate. In the figure above, equilibrium is finally reached in the third picture.. The State of Chemical Equilibrium. Chemical Equilibrium. : The state reached when the concentrations of reactants and products remain constant over time.. 2 NO. 2. (. g. ). N. 2. O. 4. (. g. ). Brown. Using Spectrophotometry . and Beer’s Law. Objectives:. . 1.) To determine the . equilibrium constant. for the reaction of iron (III) and thiocyanate to form the thiocyanatoiron(III) complex ion using spectrophotometric data.. . When the rates of the forward and reverse reactions become equal, the concentrations of the reactants and the products remain constant. This is the stage of chemical equilibrium. This equilibrium is . Read Chapter 13 look at the problems. Do . the AP practice test on page AP-13 A-D. (it is in between numbered pages 547-548). 2. AP Test. Historically, the first question on the free response has ALWAYS been an equilibrium question.. Chemical System: . A system is described in terms of empirical properties such as . temperature, pressure, volume and amount of substance present.. By definition, all chemical systems are fast, quantitative, stoichiometric and spontaneous! However, this assumption is NOT always true..