Chem 113 1st Edition Lecture 18 Outline of Last Lecture I. Forms of K: Multiplying reactions by an integerII. Finding K for an overall reactionIII. Manipulating equilibrium constant expressionsOutline of Current Lecture I. The reaction Quotient QII. Ways of expressing Q and calculating KIII. Determining the direction of a reactionCurrent LectureI. The reaction Quotient Qa. For the general reaction aA+bBcC+dDi.Q=[C ]c[D]d[ A ]a[B]bii. Q gives the ratio of product concentration to reactant concentrations at any point in a reaction1. At equilibrium: Q=Kiii. The law of mass action: at a given temperature, a chemical system reaches a state in which a particular ratio of reactant and product concentrations has a constant valueiv. The value of Q indicates how close the reaction is to equilibrium, and in which direction it must proceed to reach equilibriumII. Ways of expressing Q and calculating KThese 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.III. Determining the direction of a reactiona. The value of Q indicates the direction in which a reaction must proceed to reach equilibriumb. If Q<K, the reactants must decrease and the products increase; reactants products until equilibrium is reachedc. If Q>K, the reactants must increase and the products decrease; product reactants until equilibrium is reachedd. If Q=K, the system is at equilibrium and no further net change takes
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