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Chem 178 Chapter 15

Chemical Equilibrium Review

QuestionAnswer
15.1) What is the point at which the concentrations of all species are constant? Chemical equilibrium
15.1) In a rate law, are the concentrations of just reactants, just products, or both included? Reactants
15.1) What type of equilibrium exists when the rates of the forward and reverse reactions are equal? Dynamic
15.2) What is K subscript c? The equilibrium constant in terms of concentration
15.2) What is K subscript p? The equilibrium constant in terms of pressure
15.2) In an equilibrium-constant expression, is K subscript c equal to the concentration of reactants over the the concentration of products? No, concentration of products over concentration of reactants
15.2) Which phases of matter are eliminated from equilibrium-constant expressions? Solids and liquids
15.2) In the general expression relating K subscript c and K subscript p, how is the change in n calculated? Moles of gaseous product - moles of gaseous reactant
15.3) If K >> 1, do products or reactants dominate at equilibrium? Products
15.3) If K << 1, do products or reactants dominate at equilibrium? Reactants
15.3) How is the equilibrium constant for the forward reaction related to the equilibrium constant for the reverse reaction? Reciprocals
15.3) How is the equilibrium constant for a net reaction of two or more steps determined? Product of K's for individual steps
15.4) What type of equilibria has all reactants and products present in the same phase? Homogeneous
15.4) What type of equilibria has products and reactants present in different phases? Heterogeneous
15.6) What is used to determine the value of the equilibrium expression, when the system is not at equilibrium? Q, the reaction quotient
15.6) How are Q and K related when the system is at equilibrium? Q = K
15.6) How are Q and K related when the forward reaction must occur to reach equilibrium? Q < K
15.6) How are Q and K related when the reverse reaction must occur to reach equilibrium? Q > K
15.7) What is the term for a system that will shift its equilibrium position to counteract the effects of a disturbance? Le Chatelier's Principle
15.7) What disturbances does Le Chatelier's Principle include? Change in: temperature, pressure, concentration
15.7) If you remove product from a system at equilibrium, which way does the reaction proceed? Toward the product
15.7) If the pressure is increased in a gaseous system, which way does the reaction proceed? Toward the direction with fewer moles
15.7) What happens to K when increasing the temperature of an endothermic reaction? Increases
15.7) What happens to K when increasing the temperature of an exothermic reaction? Decreases
15.7) How does a catalyst speed up a reaction? Lowers activation energy
Created by: kbruning