Make Up Exam 1-solutions

Make Up Exam 1-solutions - Version 114 Make Up Exam 1...

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Version 114 – Make Up Exam 1 – VANDEN BOUT – (53585) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points What is the change in heat content when 100 g oF ice at - 10 C melts and becomes liquid water at 10 C, and is this process endothermic or exothermic? 1. 41.77 kJ; exothermic 2. 396.7 J; endothermic 3. 396.7 kJ; endothermic 4. 6.27 kJ; exothermic 5. 39.67 kJ; endothermic correct 6. 6.27 kJ; endothermic 7. 41.77 kJ; endothermic 8. 396.7 kJ; exothermic 9. 396.7 J; exothermic 10. 39.67 kJ; exothermic Explanation: 002 10.0 points Milk oF magnesia has a pH = 10.4. What is its [OH ]? 1. 1 . 0 × 10 7 M 2. 4 . 0 × 10 11 M 3. 2 . 5 × 10 4 M correct 4. 1 . 0 × 10 4 M 5. 3.6 M Explanation: 003 10.0 points ±our substances HCl, I 2 , HI, and Cl 2 are mixed in a reaction vessel and allowed to reach equilibrium in the reaction 2 HCl(g) + I 2 (s) 2 HI(g) + Cl 2 (g) IF more I 2 is added to the vessel, what happens to the amount oF Cl 2 ? 1. remains the same correct 2. increases 3. decreases Explanation: According to Le Chatelier’s principle, I 2 is solid and already present in excess in the original equilibrium. Adding more solid will not e²ect the equilibrium so the amount oF Cl 2 will not change. 004 10.0 points Dissociation oF a solid is aided by 1. weak binding oF species in the solid and strong interactions between the solvent and solute. correct 2. strong binding in the solid and weak solvent-solute interaction. 3. None oF these is correct. 4. strong interaction between solvent molecules. Explanation: Weak intermolecular Forces in the solute Facilitate separation oF its particles and strong attractive Forces between solute and solvent Facilitate dissociation oF a solid. 005 10.0 points Choose the pair oF concentrations that cannot be in a given aqueous solution at 25 C. 1. [H + ] = 10 M : [OH ] = 10 15 M 2. [H + ] =10 3 M : [OH ] = 10 11 M 3. [H + ] = 10 7 M : [OH ] = 10 7 M
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Version 114 – Make Up Exam 1 – VANDEN BOUT – (53585) 2 4. All of these can exist correct 5. [H + ] = 10 14 M : [OH ] = 1 M Explanation: All of these concentrations are possible. Re- call that pH can exist beyond 1-14 range, but at 25 C, pH + pOH = 14 always applies. 006 10.0 points Everyone should recognize that ? is a strong acid, ? is a weak acid, ? is a strong base, and ? is a salt. 1. HCl; CH 4 ; NaOH; NaCl 2. HCl; H 2 SO 4 ; NaOH; NaBr 3. HCl; CH 3 COOH; NaOH; NaBr correct 4. HCl; H + ; NaOH; NaCl 5. HNO 3 ; CH 3 COOH; NaOH; MgO Explanation: Of the answer choices, hydrochloric acid (HCl), nitric acid (HNO 3 ), and sulfuric acid (H 2 SO 4 ) are strong acids because they dis- sociate completely in water. Acetic acid (CH 3 COOH) is a weak acid due to its par- tial dissociation. Sodium hydroxide (NaOH) and magnesium oxide (MgO) are strong bases, dissociating completely to yield hydroxide
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Make Up Exam 1-solutions - Version 114 Make Up Exam 1...

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