Chem2 hw5 - Yoon, Seong Meen Homework 5 Due: Oct 10 2007,...

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Unformatted text preview: Yoon, Seong Meen Homework 5 Due: Oct 10 2007, 11:00 pm Inst: James Holcombe 1 This print-out should have 28 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Acetic acid (CH 3 COOH) is generally classi- fied as 1. a weak acid because it has three hydro- gens and a hydroxyl group. 2. a weak base because it only partially ion- izes in solution. 3. amphoteric because it creates both pro- tons and hydroxyl ions in solution. 4. a weak acid because it only partially ion- izes in solution. 5. a weak base because it has one hydroxyl group. 6. a strong acid because it has four hydro- gens. 7. a strong acid because if fully ionizes in solution. 002 (part 1 of 1) 10 points The strength of an acid or base is a measure of 1. how completely it dissociates in aqueous solution. 2. how vigorously it reacts with the other molecules. 3. how many hydroxide or hydrogen ions it contains. 4. the strength of its attraction to water molecules. 003 (part 1 of 1) 10 points In the reversible reaction H 3 O + + NH 3 * ) H 2 O + NH + 4 , what two substances act as acids in the Bronsted-Lowry sense? 1. H 3 O + and H 2 O 2. H 3 O + and NH + 4 3. some other pair 4. NH 3 and H 2 O 5. NH 3 and NH + 4 004 (part 1 of 1) 10 points The pH of a 1 10- 8 M solution of HNO 3 is 1. 6.96 2. 8 3. 6 4. 7 005 (part 1 of 1) 10 points In the series HClO, HClO 2 , HClO 3 , HClO 4 , which is the strongest acid? 1. HClO 4 2. HClO 2 3. HClO 3 4. HClO 006 (part 1 of 1) 10 points The pH of a human blood sample was mea- sured to be 7.41. What is the [OH- ] in this blood? 1. Cannot be determined from the informa- tion given. 2. 3 . 89 10- 8 mol/L Yoon, Seong Meen Homework 5 Due: Oct 10 2007, 11:00 pm Inst: James Holcombe 2 3. 4 . 12 10- 7 mol/L 4. 2 . 57 10- 7 mol/L 5. 6.59 mol/L 6. 6 . 05 10- 7 mol/L 007 (part 1 of 1) 10 points Assume that five weak acids, identified only by numbers (1, 2, 3, 4 and 5), have the follow- ing ionization constants.ing ionization constants....
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This note was uploaded on 05/14/2009 for the course CH 53575 taught by Professor Hackert during the Spring '09 term at University of Texas at Austin.

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Chem2 hw5 - Yoon, Seong Meen Homework 5 Due: Oct 10 2007,...

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