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Unformatted text preview: calvert (lmc2923) Homework 1 clinger (20682) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points The DOMINANT intermolecular force that causes gaseous HCl molecules to attract one another is 1. van der Waals. 2. ionic. 3. dipole-dipole. correct 4. None of these is dominant. 5. covalent. Explanation: HCl would also possess van der Waals in- termolecular forces but, due to the small size, these would not be the dominant force. 002 10.0 points Identify the kinds of intermolecular forces that might arise between molecules of Br 2 . 1. London forces, dipole-dipole, hydrogen bonding 2. London forces correct 3. hydrogen bonding 4. London forces, dipole-dipole 5. None of these 6. dipole-dipole Explanation: Br b b b b b b Br b b b b b b is non-polar. 003 10.0 points Which of the following can form intermolecu- lar hydrogen bonds? 1. CH 3 OCH 3 2. CH 3 CH 2 CH 2 CH 2 CH 3 3. CH 3 OH correct 4. HBr 5. AsH 3 Explanation: Only molecules with H attached to the elec- tronegative atoms N, O, and F can hydrogen bond. Of the molecules given only CH 3 OH has the H directly bonded to O, so it can undergo hydrogen bonding. 004 10.0 points What are all of the intermolecular forces that are responsible for the existence of ice? 1. hydrogen bonding and dipole-dipole 2. dipole-dipole and ion-ion 3. London forces 4. dipole-dipole and London forces 5. dipole-dipole, London forces, and hydro- gen bonding correct Explanation: Ice is solid H 2 O. This molecule exhibits dispersion. Because it is polar it also exhibits dipole-dipole interactions. Finally because of the H bonded to the electronegative O atom it also exhibits hydrogen bonding; this polar bond can orient and interact with the lone pair of an O atom on another H 2 O molecule. 005 10.0 points Which is NOT a consequence of hydrogen bonding between water molecules? 1. Water has a high specific heat. 2. Ice floats on water. 3. Water has a high boiling point. calvert (lmc2923) Homework 1 clinger (20682) 2 4. Water is colorless and odorless. correct Explanation: The other properties specifically arise due to H-bonding in water molecules. Simi- lar sized molecules which do not exhibit H- bonding have lower boiling points and specific heats, and more dense solid forms. 006 10.0 points When a solution of ethanol (C 2 H 5 OH) is formed in water, the ethanol molecules 1. are attracted to the nonpolar water molecules. 2. are not attracted to the polar water molecules. 3. form covalent bonds to the polar water molecules. 4. form hydrogen bonds to the polar water molecules. correct Explanation: H C H H C H H O H b b b b O b b b b H H 007 10.0 points The attractions between anions and cations in a crystal are known as 1. hydrogen bonds....
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