chem_126_common_2_2008_xlj448hqq1

chem_126_common_2_2008_xlj448hqq1 - Chem 126 Common 2 March...

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Chem 126 Common 2 March 7, 2008 Dr. Ellis NONE OF THE MULTIPLE CHOICE PROBLEMS REQUIRES EXTENSIVE OR TIME COMSUMING CALCULATIONS. IF YOUR METHOD REQUIRES EXTENSTIVE CALCULATIONS IT IS EITHER WRONG OR HARDER THAN WHAT IS REQUIRED. 1. What is the equilibrium constant for the reaction: 2 ( ) ( ) 3C(g)+D(s) A s B g + , given that in a 5.00 L container A = 0.35 moles, B = 0.20 moles, C = 0.25 moles, and D = 0.21 moles at equilibrium? (a) 0.13 M 2 (b) 0.027 M 2 (c) 1.25 M 2 (d) 0.39 M 2 (e) 0.0031 M 2 2. Some silicon dioxide, water, silane (SiH 4 ), and oxygen are at equilibrium in a sealed container at a particular temperature: ( 29 ( 29 ( 29 ( 29 2 2 4 2 2 2 0 SiO s H O g SiH g O g H + + In which of the following cases does the reaction NOT proceed to right to reestablish equilibrium? (a) Some silicon dioxide is added. (b) Some water vapor is added. (c) Some oxygen is removed. (d) The temperature is increased. (e) The volume of the container is increased. 3. All of the following compounds are soluble in water and are strong electrolytes except (a) NaI. (b) PbI 2 . (c) Ca(CH 3 COO) 2 . (d) NH 4 CH 3 COO. (e) MgCl 2 . 4. The concentration of an HCl solution is 0.25 M. What is the pH? (a) -1.38 (b) -0.60 (c) 0 (d) 0.60 (e) 1.38 5. 5.60 g of HI is dissolved in enough water to make a 0.200 L solution. What is the pH? (a) -0.75 (b) -1.45 (c) 1.52 (d) 0.75 (e) 0.66 6. Calculate the pH of a 4.43 x 10 -5 M barium hydroxide, Ba(OH) 2 , solution.
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This note was uploaded on 03/30/2012 for the course CHEM 126 taught by Professor Biolsi during the Spring '08 term at NJIT.

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chem_126_common_2_2008_xlj448hqq1 - Chem 126 Common 2 March...

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