Suggest Prob 6_Solutions

Suggest Prob 6_Solutions - kapur (rk7259) Suggested...

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kapur (rk7259) – Suggested Problems 6 – rowland – (53210) 1 This print-out should have 43 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points Which oF the Following statements about acids and bases is correct? 1. An acid accepts a hydrogen ion by sharing a previously unshared electron pair with H + . 2. IF an acid is strong, its conjugate base will be relatively stronger. 3. When a strong base reacts with water, the reaction proceeds 100% in the Forward direction. correct 4. An acid-base reaction involves the trans- Fer oF a hydroxide ion OH From a base to an acid. Explanation: When a strong acid or a strong base reacts with water, the reaction proceeds only in the Forward direction. 002 10.0 points Acetic acid (CH 3 COOH) is generally classi- fed as 1. amphoteric because it creates both pro- tons and hydroxyl ions in solution. 2. a strong acid because it has Four hydro- gens. 3. a weak base because it only partially ion- izes in solution. 4. a strong acid because iF Fully ionizes in solution. 5. a weak base because it has one hydroxyl group. 6. a weak acid because it only partially ion- izes in solution. correct 7. a weak acid because it has three hydro- gens and a hydroxyl group. Explanation: Acetic acid is only partially dissociated in water and so it is classifed as a weak acid. 003 10.0 points Which chemical equation shows the dissocia- tion oF magnesium hydroxide? 1. Mg(OH) 2 Mg 2+ + 2 H 2 O 2. MgOH Mg 2+ + OH 2 3. Mg(OH) 3 Mg 3+ + 3 OH 4. Mg(OH) 2 Mg 2+ + 2 OH correct Explanation: Basic concept 004 10.0 points A substance that is composed oF a metal plus a nonmetal is 1. an acid. 2. an oxide. 3. a base. 4. a salt. correct Explanation: A salt is a compound composed oF a cation (metal) other than H + and an anion (non- metal) other than OH or O 2 . 005 10.0 points All acidic aqueous solutions contain the ion 1. acetate 2. H 3 O + correct 3. O 2 2 4. NH + 4 5. Na +
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kapur (rk7259) – Suggested Problems 6 – rowland – (53210) 2 Explanation: A solution is acidic if more H 3 O + ions than OH ions are present. H 3 O + is used to rep- resent the protons (H + ) that are present in aqueous solution in hydrate form. 006 10.0 points Aqueous ammonia can be used to neutralize sulfuric acid (H 2 SO 4 ) and nitric acid (HNO 3 ) to produce two salts extensively used as fer- tilizers. They are 1. NH 4 SO 3 and NH 4 OH, respectively. 2. cyanamide and cellulose nitrate, respec- tively. 3. (NH 4 ) 2 SO 4 and NH 4 NO 3 , respectively. correct 4. NH 4 SO 4 and NH 4 NO 3 , respectively. Explanation: Aqueous ammonia is a weak base which reacts with acids to form salts. With sulfu- ric acid and nitric acid, it forms ammonium sulfate and ammonium nitrate, respectively, both of which are used as fertilizers. 007
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Suggest Prob 6_Solutions - kapur (rk7259) Suggested...

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