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Unformatted text preview: 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 – find 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- 002 10.0 points A substance that is composed of a metal plus a nonmetal is 1. a salt. 2. an acid. 3. a base. 4. an oxide. 003 10.0 points An equilibrium in which processes occur con- tinuously, with NO NET change, is called 1. hetergeneous equilibrium. 2. dynamic equilibrium. 3. static equilibrium. 4. homogeneous equilibrium. 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 . 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 . 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. 5. A system that is disturbed from an equi- librium condition responds in a manner to restore equilibrium. 006 10.0 points Equilibria involving species in more than one phase are called 1. heterogeneous equilibria. 2. reversible reaction. 3. homogeneous equilibria. 4. chemical equilibria. 007 10.0 points Explain why equilibium constants are dimen- sionless. 1. They are dimensionless because concen- kapur (rk7259) – Suggested Problems 4 – rowland – (53210) 2 trations and pressures have no units. 2. They are not really dimensionless but we must treat them as such in order to be able to take ln K in the expression Δ G =- RT ln K . 3. Every concentration or pressure that en- ters into K c or K p is really divided by the cor- responding concentration or pressure of the substance in its standard state. 4. The statement is not true. Equilibrium constants have units that involve some multi- ple of atmospheres or moles per liter. 5. They are dimensionless because the pres- sures or concentrations we put in are all for the substances in their standard states. 008 10.0 points Pure liquids or solids do NOT appear in the equilibrium constant expression....
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- Fall '07
- Equilibrium, Kc