Suggest Prob 4_Solutions

Suggest Prob - kapur(rk7259 Suggested Problems 4 rowland(53210 This print-out should have 50 questions Multiple-choice questions may continue on

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kapur (rk7259) – Suggested Problems 4 – rowland – (53210) 1 This print-out should have 50 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points Which chemical equation shows the dissocia- tion oF magnesium hydroxide? 1. Mg(OH) 2 Mg 2+ + 2 H 2 O 2. Mg(OH) 3 Mg 3+ + 3 OH 3. MgOH Mg 2+ + OH 2 4. Mg(OH) 2 Mg 2+ + 2 OH correct Explanation: Basic concept 002 10.0 points A substance that is composed oF a metal plus a nonmetal is 1. a salt. correct 2. an acid. 3. a base. 4. an oxide. Explanation: A salt is a compound composed oF a cation (metal) other than H + and an anion (non- metal) other than OH or O 2 . 003 10.0 points An equilibrium in which processes occur con- tinuously, with NO NET change, is called 1. hetergeneous equilibrium. 2. dynamic equilibrium. correct 3. static equilibrium. 4. homogeneous equilibrium. Explanation: In dynamic equilibrium the Forward and re- verse processes oF the system continue but be- cause their rates are equal there is no change in the composition oF the system. 004 10.0 points In which oF the Following cases will the LEAST time be required to arrive at equilibrium? K below reFers to the equilibrium constant. 1. Cannot tell since the time to arrive at equilibrium does not depend on K . correct 2. K is a very large number. 3. K is about 1. 4. K is a very small number. 5. Cannot tell without knowing the value oF K . Explanation: The equilibrium constant K re±ects the relative amounts oF products and reactants present when the reaction is complete, and gives no inFormation on the time needed. The rate constant k indicates how Fast the reaction occurs. 005 10.0 points Which oF the statements concerning equilib- rium is NOT true? 1. A system moves spontaneously toward a state oF equilibrium. 2. Equilibrium in molecular systems is dy- namic, with two opposing processes balancing one another. 3. The value oF the equilibrium constant For a given reaction is the same regardless oF the direction From which equilibrium was attained. 4. The equilibrium constant usually is inde- pendent oF temperature. correct 5. A system that is disturbed From an equi- librium condition responds in a manner to
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kapur (rk7259) – Suggested Problems 4 – rowland – (53210) 2 restore equilibrium. Explanation: Equilibrium constants are temperature de- pendent. 006 10.0 points Equilibria involving species in more than one phase are called 1. heterogeneous equilibria. correct 2. reversible reaction. 3. homogeneous equilibria. 4. chemical equilibria. Explanation: If all components of the equilibrium system are in the same phase, equilibrium is homoge- nous; if more than one phase is represented in the system, equilibrium is heterogenous. 007
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This note was uploaded on 01/30/2010 for the course GOV 312L taught by Professor Madrid during the Fall '07 term at University of Texas at Austin.

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Suggest Prob - kapur(rk7259 Suggested Problems 4 rowland(53210 This print-out should have 50 questions Multiple-choice questions may continue on

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