____CH~3 - CHAPTER 14 NON ACID/BASE CHEMICAL EQUILIBRIUM 1...

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CHAPTER 14 NON ACID/BASE CHEMICAL EQUILIBRIUM 1
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NON ACID-BASE EQUILIBRIUM CONCEPTS 4 Chem 162-2007 Final exam + answers Chapter 14 – Non Acid-Base Chemical Equilibrium Non Acid-Base equilibrium concepts For which of the following reactions is K c > K p ? A. H 2 O(s) H 2 O(g) B . H 2 (g) + ½ O 2 (g) H 2 O(g) C. H 2 (g) + Cl 2 (g) 2HCl(g) D. 2KClO 3 (s) KCl(s) + 3O 2 (g) E. 2O 3 (g) 3O 2 (g) K pinatm = K cinM (RT) ∆ngas K p = K c when n gas = 0 K p > K c when n gas >0 K c > K p when n gas < 0. A. n = 1 – 0 = 1 B. n = 1 – 1.5 = -0.5 C. n = 2 – 2 = 0 D. n = 3 – 0 = 3 E. n = 3 – 2 = 1 Actually, the relative values of K c and K p also depend on the temperature. At 298K the rules I wrote apply. 2
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29 Chem 162-2007 Final exam + answers Chapter 14 – Non Acid-Base Chemical Equilibrium Non Acid-Base equilibrium concepts H 2 (g) + I 2 (g) 2HI(g) K = 54.5 What is the equilibrium constant for the reaction: HI(g) ½ H 2 (g) + ½ I 2 (g) A. 27.2 B. 0.0367 C. 7.38 D. 1.45 E . 0.135 Reversing the reaction corresponds to inverting K. Taking half the reaction corresponds to taking the square root of K. Hence, we want to take the square root of the inverse of K. (1/54.5) 0.5 = 0.135 3
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32 Chem 162-2007 Final exam + answers Chapter 14 – Non Acid-Base Chemical Equilibrium Non Acid-Base equilibrium concepts Consider the following plot for the reaction: A(g) B(g) K = 3.0 X Y Z [A] M [B] M Equilibrium line Which of the following statements is true ? A. Point Z represents Q < K. B. Point X represents Q>K. C. Point Y represents Q<K D . Point X represents Q<K E. The system is at equilibrium when [B] = 4.0M and [A] = 2.0M Visualize an example of 6 on the B axis meeting 2 on the A axis at Z A. False. Point Z represents a 3/1 ratio of [B]/[A], which is equal to K. B. False. This would be approximately 6/5 = 1.2, which is < K. C. False. This would be approximately 15/3 = 5, which is > K. D. True. This would be approximately 6/5 = 1.2, which is < K. E. False. 4.0/2.0 = 2.0, which is < K. CHEM 162-2007 EXAM II + ANSWERS CHAPTER 14 – NON-ACID/BASE CHEMICAL EQUILIBRIUM NON-ACID BASE EQUILIBRIUM CONCEPTS 4
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15. When I 2 (s) is added to water, a saturated solution at equilibrium results. The dissolved iodine imparts a gold color to the water. The equilibrium is represented as: I 2 (s) I 2 (aq) After equilibrium is established, some radioactive solid iodine is added to the solution. After a period of time, the solution remains saturated, and the intensity of the gold color in the solution remains the same. When the solution is tested, it is found that some of the radioactivity is now in the solution as well as in the solid. What does this experiment indicate about the equilibrium?
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This document was uploaded on 11/02/2011 for the course GEN CHEM 162 at Rutgers.

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____CH~3 - CHAPTER 14 NON ACID/BASE CHEMICAL EQUILIBRIUM 1...

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