1178564644Xuj - Anderson, Kiel Homework 5 Due: Mar 1 2007,...

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Anderson, Kiel – Homework 5 – Due: Mar 1 2007, midnight – Inst: McCord 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. The due time is Central time. 001 (part 1 oF 1) 10 points A hydrogen ion H + is the same as 1. an electron. 2. a hydrate. 3. a hydronium ion. 4. a proton. correct Explanation: Neutral H contains 1 electron and 1 proton. It loses the one electron to become H + , thus there is only a single proton leFt. 002 (part 1 oF 1) 10 points According to the Bronsted-Lowry Theory oF acids and bases, a base is 1. a substance which when dissolved in water yields OH - . 2. a proton donor. 3. an electron donor. 4. a proton acceptor. correct 5. an electron acceptor. Explanation: Bases are defned by the Arrhenius the- ory as substances which in water produce hy- droxide ions, by the Bronsted-Lowry theory as substances which accept protons, and by the Lewis theory as substances which provide electron pairs. 003 (part 1 oF 1) 10 points Which is NOT a conjugate acid-base pair? 1. H 3 SO + 4 : H 2 SO 4 2. H 2 SO 4 : SO 2 - 4 correct 3. H 2 O : OH - 4. HCl : Cl - 5. H 2 : H - Explanation: Except For H 2 SO 4 and SO 2 - 4 , the members oF all oF the pairs di±er by one proton. 004 (part 1 oF 1) 10 points Which oF the Following can exhibit amphoter- ism? 1. HClO 4 2. Sn 2+ 3. HPO 2 - 4 correct 4. O 2 - 5. CrO 2 - 4 Explanation: 005 (part 1 oF 1) 10 points What is the conjugate acid oF NO - 3 ? 1. HNO 3 correct 2. H + 3. OH - 4. NO 3 2 - 5. NO 2 - 6. NH 3 Explanation: Since the question asks For the conjugate acid, we can assume NO - 3 is acting as a base. This means that it is a proton acceptor. To Form the conjugate acid, it accepts a H making HNO 3 . 006 (part 1 oF 1) 10 points
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Anderson, Kiel – Homework 5 – Due: Mar 1 2007, midnight – Inst: McCord 2 The hydronium ion concentration in a solu- tion at pH 10 has what relationship to the hydronium ion concentration in a solution at pH 13? 1. 100 times less than 2. 1,000 times less than 3. 1,000 times greater than correct 4. 3 times greater than Explanation: For pH 10 , M H + = 1 × 10 - 10 For pH 13 , M H + = 1 × 10 - 13 007 (part 1 of 1) 10 points Which pH represents a solution with 1000 times higher [OH - ] than a solution with pH of 5? 1.
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1178564644Xuj - Anderson, Kiel Homework 5 Due: Mar 1 2007,...

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