Fahkreddine_HW4 - tu (pyt67) Homework 4 Fakhreddine (52425)...

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tu (pyt67) – Homework 4 – Fakhreddine – (52425) 1 This print-out should have 30 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. hydronium ions; a solution whose pH is greater than 7.0 2. the hydroxide ion or hydroxyl group; hy- droxide ions 3. an unshared pair o± pair o± electrons; a nonelectrolytic solution 4. hydrogen; hydrogen ions correct 5. an unshared pair o± electrons; an elec- trolytic solution 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 According to the Bronsted-Lowry Theory o± acids and bases, a base is 1. a proton acceptor. correct 2. an electron acceptor. 3. a substance which when dissolved in water yields OH . 4. a proton donor. 5. an electron donor. 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 1.0 points Identi±y the Brønsted acid in the FOR- WARD reaction HSO 3 (aq) + NH + 4 (aq) NH 3 (aq) + H 2 SO 3 (aq) . 1. NH 3 2. NH + 4 correct 3. HSO 3 4. H 2 SO 3 Explanation: A Brønsted acid is a proton donor. 004 1.0 points Which is NOT a conjugate acid-base pair? 1. H 2 : H 2. HCl : Cl 3. H 2 O : OH 4. H 2 SO 4 : SO 2 4 correct 5. H 3 SO + 4 : H 2 SO 4 Explanation: Except ±or H 2 SO 4 and SO 2 4 , the members o± all o± the pairs di²er by one proton. 005 1.0 points In the reversible reaction HSO 3 + H 2 O SO 3 2 + H 3 O + , what two substances act as acids in the Bronsted-Lowry sense? 1. some other pair 2. HSO 3 and H 2 O 3. H 3 O + and H 2 O 4. HSO 3 and H 3 O + correct
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tu (pyt67) – Homework 4 – Fakhreddine – (52425) 2 5. SO 2 3 and H 3 O + Explanation: 006 1.0 points In the series HClO, HClO 2 , HClO 3 , HClO 4 , which is the strongest acid? 1. HClO 3 2. HClO 2 3. HClO 4 correct 4. HClO Explanation: For any series of compounds containing hy- drogen, oxygen and a non-metal, the acidity increases as the number of the oxygen atoms in the molecule increases. 007 1.0 points Of the following, a) HBr b) HF c) HNO 3 d) HNO 2 e) H 2 CO 3 f) H 3 AsO 4 which acids are weak acids? 1. a; b; e 2. a; b; c 3. b; d; e; f correct 4. d; e; f 5. Another combination Explanation: Hydro±uoric acid (HF), nitrous acid (HNO 2 ), H 2 CO 3 (carbonic acid), and arsenic acid (H 3 AsO 4 ) are all considered weak acids since they do not dissociate completely. Hy- drobromic acid (HBr) and nitric acid (HNO 3 ) are considered strong acids due to complete dissociation. 008
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Fahkreddine_HW4 - tu (pyt67) Homework 4 Fakhreddine (52425)...

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