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Practice Exam 2

Practice Exam 2 - Chem 105b Sample Exam 2 Name INSTRUCTIONS...

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Chem 105b Sample Exam 2 Name________________________ INSTRUCTIONS: 1. You must show your work to receive credit. If you need more space, use the back of the page. 2. The test has a total of 7 pages with 9 questions. Please make sure you have all of the pages before you begin. There are table of equilibrium constants on the last page. 3. Manage your time! If you get stuck on a problem – make sure you have attempted the other problems before spending too much time on it. Good luck! pH = pK a + log[A - ] [HA] pH = -log[H + ] pOH = -log[OH - ] pK = -logK K a x K b = K w at 25 °C pK a + pK b = 14 at 25 °C
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1. (10 pts) Consider the following equilibrium: Ag + (aq) + Cl - (aq) AgCl (s) which is exothermic. Use Le Châtelier’s principle to predict how the amount of solid silver chloride will change when the equilibrium is disturbed by: a. Adding NaCl. b. Adding AgNO 3 . c. Adding NH 3 (Ag(NH 3 ) 2 + is insoluble). d. Removing Cl - . e. Heating the reaction mixture. 2. (9 pts) Circle all that apply. Dimethylamine is a ( Bronsted-Lowry acid, Bronsted-Lowry base, Lewis acid, Lewis base ).
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