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CH 301 hw10 solution (1)

CH 301 hw10 solution (1) - cha(dyc97 Homework 10...

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cha (dyc97) – 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 VSEPR theory. 2. the kinetic-molecular theory. correct 3. the atomic theory. 4. the molecular theory. Explanation: 002 10.0 points Which one of the following statements does NOT describe the general properties of liq- uids accurately? 1. A liquid sample has a characteristic volume that does not change greatly with changes in pressure. 2. The liquid state is highly disordered com- pared to the solid state. 3. Liquids diffuse only very slowly when compared to solids. correct 4. A liquid sample has a characteristic volume that does not change greatly with changes in temperature, assuming that the liquid is not vaporized. 5. Liquids have high densities compared to gases. Explanation: Liquids diffuse slowly; however, solids don’t diffuse well at all. 003 10.0 points Consider the two water molecules O H H O H H A B Which statement is correct? 1. The hydrogen bond A is stronger than the covalent bond B . 2. The hydrogen bond B is stronger than the covalent bond A . 3. The covalent bond B is stronger than the hydrogen bond A . 4. The covalent bond A is stronger than the hydrogen bond B . correct Explanation: O H H δ - δ - δ + O H H δ - δ - δ + 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. I, II, III, II, I 2. III, II, IV, III, III 3. II, IV, III, IV, IV 4. I, II, IV, I, III 5. I, IV, III, I, II correct
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cha (dyc97) – Homework 10 – Sutcliffe – (53770) 2 6. III, IV, I, I, II 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 Waal’s 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. covalent 4. ionic 5. dipole-dipole correct 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. Permanent dipole-dipole interactions are stronger than London forces and occur be- tween polar covalent molecules due to charge separation.
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