Homework 05 - ycs73 Homework 5 Fakhreddine (53605) This...

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ycs73 – Homework 5 – Fakhreddine – (53605) 1 This print-out should have 28 questions. Multiple-choice questions may continue on the next column or page – fnd all choices be±ore answering. 001 1.0 points An Arrhenius acid must contain ? and dissociate in aqueous solutions to produce ? . 1. an unshared pair o± electrons; an elec- trolytic solution 2. hydronium ions; a solution whose pH is greater than 7.0 3. hydrogen; hydrogen ions correct 4. an unshared pair o± pair o± electrons; a nonelectrolytic solution 5. the hydroxide ion or hydroxyl group; hy- droxide ions Explanation: The Arrhenius theory o± acids and bases de- fnes acids as substances which ionize in water and produce hydrogen ions. The hydrogen is covalently bonded to a nonmetal in the pure substance. 002 1.0 points H 3 O + is called the 1. hydroxide ion. 2. hydronium ion. correct 3. hydrate ion. 4. hydrogen ion. Explanation: H 3 O + is called the hydronium ion. 003 1.0 points According to the Bronsted-Lowry Theory o± acids and bases, a base is 1. a proton donor. 2. a substance which when dissolved in water yields OH . 3. an electron acceptor. 4. an electron donor. 5. a proton acceptor. correct 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. 004 1.0 points Using the Bronsted-Lowry defnition ±or acids and bases, what is the ±unction o± water in the equation HCl + H 2 O H 3 O + + Cl 1. base correct 2. solvent 3. salt 4. acid Explanation: A Bronsted-Lowry base is a proton accep- tor. H 2 O accepts H + ±rom HCl. 005 1.0 points Write the balanced molecular equation ±or the reaction o± barium hydroxide with perchloric acid. What is the coe²cient o± H 2 O? 1. one 2. fve 3. two correct 4. ±our 5. three Explanation: Ba(OH) 2 + 2 HClO 4
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ycs73 – Homework 5 – Fakhreddine – (53605) 2 Ba(ClO 4 ) 2 + 2 H 2 O( ) 006 1.0 points Write the net ionic equation for the reaction of hydrobromic acid with calcium hydroxide. Use the smallest possible integers as coe±- cients. What is the sum of the coe±cients? Use H 3 O + rather than H + where appropri- ate. 1. seven 2. four correct 3. three 4. ²ve 5. six Explanation: 2 HBr(aq) + Ca(OH) 2 (aq) CaBr 2 (aq) + 2 H 2 O( ) All of the aqueous species are ionized. 2 H
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This note was uploaded on 04/15/2009 for the course CH 53625 taught by Professor Fakhreddine during the Spring '09 term at University of Texas at Austin.

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Homework 05 - ycs73 Homework 5 Fakhreddine (53605) This...

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