Exam 1 Spring2011 - Please bubble in your name, UFID #, and...

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CHM 2046 EXAM 1 FORM CODE A 02/03/2011 1. At some temperature, the reaction N 2 (g) + 3H 2 (g) 2NH 3 has an equilibrium constant, K (g) c (a) An equilibrium mixture must have a H , numerically equal to 1. For such a situation, which of the following statement is true? 2 concentration three times that of N 2 and an NH 3 concentration twice that of H 2 (b) An equilibrium mixture must have a H . 2 concentration three times that of N 2 (c) A mixture in which the H . 2 concentration is three times that of N 2 and a NH 3 concentration is twice that of N 2 (d) A mixture in which the concentration of each reactant and each product is 1 M is an equilibrium mixture. could be an equilibrium mixture. (e) Any mixture in which the concentrations of all reactants and products are equal is an equilibrium mixture. 2. The equilibrium constant, K c HCHO (g) ↔ H , for the following reaction is 0.5 at a given temperature. 2 A mixture of HCHO, H (g) + CO (g) 2 and CO is introduced into a flask at this temperature. After a short time, analysis of a small sample of the reaction mixture shows the concentrations to be [HCHO] = 0.5 M, [H 2 (a) The reaction mixture is at equilibrium. ] = 1.5 M and [CO] = 0.25 M. Which of the following statement is true? (b) The reaction mixture is not at equilibrium and the backward reaction will occur. (c) The reaction mixture is not at equilibrium and equilibrium will be achieved by using up more HCHO. (d) After this time interval, the forward rate of this reaction is the same as the backward rate. (e) After this time interval, Q c is lower than K c. . 3. The following reactions are allowed to reach equilibrium. Which of the equilibrium mixtures is not affected by a pressure change? (a) 2NOCl (g) ↔ N 2 (g) + O 2 (g) + Cl 2 (b) PCl (g) 3 (g) + Cl 2 (g) ↔ PCl 5 (c) 2NO (g) + Br (g) 2 (d) CO (g) ↔ 2NOBr (g) 2 (g) + H 2 (g) CO (g) + H 2 (e) CO (g) + 3H O (g) 2 (g) CH 4 (g) + H 2 O (g) 4. Here are some reactions and equilibrium constants.
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This note was uploaded on 01/17/2012 for the course CHM 2046 taught by Professor Veige/martin during the Spring '07 term at University of Florida.

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Exam 1 Spring2011 - Please bubble in your name, UFID #, and...

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