CHEM 113 Lecture 10 Outline of Last Lecture - Catalystso Homogenouso Heterogeneouso EnzymesOutline of Current Lecture - Equilibrium- Equilibrium Constanto How K describes the reaction- QCurrent LectureCHP. 17: Equilibrium: The Extent of Chemical Reactions- Equilibriumo Reactions are reversible And because of this are able to reach a state of equilibriumo At equilibrium, the concentration of both reactants and products are the same.o At equilibrium, the forward rate is equivalent to the reverse rate. The reaction continues to occur and there is not net change on the macroscopic level. - The Equilibrium Constanto The equilibrium constant is depicted as K, (rate constant is lowercase k)o K is a number equal to a particular ratio of equilibrium concentrations of product(s) and reactant(s) at a particular temperature. o K and the extent of reactionThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute. K reflects a particular ratio of product concentrations to reactant concentrations for a reaction. Therefore K indicates the extent of a reaction, or how far a reaction proceeds towards the products at a given temperature. A small value of K indicated that the reaction yields little product before reaching equilibrium. - The reaction favors the reactants. A large K value indicates that the reaction reaches equilibrium with very little reactant remaining.- The reaction favors the products. A good image to visualize this is Figure 17.2 on page 679.- The Reaction Quotient Qo Q gives the ratio of product concentrations to react concentrations at any point in a reaction.o If a system is at equilibrium the Q=Ko For a particular system and temperature, the same equilibrium state is attained regardless of starting concentrations. o The value of Q indicates how close the reaction is to equilibrium and in which direction it must proceed to reach
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