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Unformatted text preview: padilla (tp5647) Homework 10 Sutcliffe (53770) 1 This print-out should have 27 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points The theory used to explain the behavior of solids, liquids and gases is 1. the molecular theory. 2. the kinetic-molecular theory. correct 3. the VSEPR theory. 4. the atomic theory. Explanation: 002 10.0 points Which one of the following statements does NOT describe the general properties of liq- uids accurately? 1. The liquid state is highly disordered com- pared to the solid state. 2. A liquid sample has a characteristic volume that does not change greatly with changes in pressure. 3. A liquid sample has a characteristic volume that does not change greatly with changes in temperature, assuming that the liquid is not vaporized. 4. Liquids diffuse only very slowly when compared to solids. correct 5. Liquids have high densities compared to gases. Explanation: Liquids diffuse slowly; however, solids dont diffuse well at all. 003 10.0 points Consider the two water molecules O b b b b H H O b b b b H H A B Which statement is correct? 1. The hydrogen bond B is stronger than the covalent bond A . 2. The covalent bond A is stronger than the hydrogen bond B . correct 3. The hydrogen bond A is stronger than the covalent bond B . 4. The covalent bond B is stronger than the hydrogen bond A . Explanation: O b b b b H H - - + O b b b b H H - - + A B A is a covalent bond while B is a hydrogen bond. Covalent bonds are much stronger than H-bonds. 004 10.0 points Assign the strongest relevant intermolecular force to the following species, respectively: RbCl 2 , C 6 H 6 (benzene) , HI , Fe 2 O 3 , CH 2 NH . I) ionic forces II) hydrogen bonding III) dipole-dipole IV) van der Waals forces 1. III, IV, I, I, II 2. I, II, IV, I, III 3. II, IV, III, IV, IV 4. I, II, III, II, I 5. III, II, IV, III, III padilla (tp5647) Homework 10 Sutcliffe (53770) 2 6. I, IV, III, I, II correct 7. I, III, III, IV, II Explanation: Rubidium Chloride and Iron(III) oxide are both ion-ion. Benzene is non-polar and thus has only van der Waals forces. Hydroiodic acid is polar and has dipole-dipole interac- tions. Methylimine has H-bonding. 005 10.0 points What would be the most significant type of intermolecular forces in a liquid sample of fluoroform (CHF 3 )? 1. hydrogen bonding 2. dispersion 3. dipole-dipole correct 4. ionic 5. covalent Explanation: London forces, dispersion forces, van der Waals or induced dipoles all describe the same intermolecular force. London forces are in- duced, short-lived, and very weak. Molecules and atoms can experience London forces be- cause they have electron clouds. London forces result from the distortion of the elec- tron cloud of an atom or molecule by the presence of nearby atoms or molecules....
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