fak chem hw 1 - To(st22362 Homework 1 Fakhreddine(52420 This print-out should have 30 questions Multiple-choice questions may continue on the next

fak chem hw 1 - To(st22362 Homework 1 Fakhreddine(52420...

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To (st22362) – Homework 1 – Fakhreddine – (52420) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 1.0 points Chloromethane (CH 3 Cl) forms a molecular solid. What type of forces hold it in a solid configuration? I) London forces II) dipole-dipole forces III) hydrogen bonding 1. I only 2. III only 3. I, II, and III 4. I and II only correct 5. II and III only 6. II only Explanation: Chloromethane is held in solid form by both London forces and dipole-dipole forces. 002 1.0 points What types of intermolecular interactions does chloroform (CH 3 Cl) exhibit? I) instantaneous dipole II) dipole-dipole III) hydrogen bonding IV) covalent bonding Recall that chloroform is tetrahedral elctronic geometry with C as the central atom. 1. II and IV only 2. I and II only correct 3. I, II, and III only 4. II and III only 5. II only Explanation: All molecules, because they have elec- tron clouds, experience instantaneous dipoles. CH 3 Cl is polar and thus experiences dipole- dipole interactions. CH 3 Cl does not contain any O H, N H, or F H bonds and therefore does not experience any hydrogen bonding interactions. Covalent bonding is an intramolecular interaction. 003 1.0 points What types of intermolecular interactions does ammonia (NH 3 ) exhibit? I) instantaneous dipole or van der Waals II) dipole-dipole III) hydrogen bonding IV) covalent bonding 1. II only 2. II and III only 3. I and II only 4. I, II, and III only correct 5. II and IV only 6. I only Explanation: All molecules, because they have elec- tron clouds, experience instantaneous dipoles. NH 3 is polar and thus experiences dipole-dipole interactions. NH 3 contains N Hbonds and therefore experiences hy- drogen bonding interactions. Covalent bond- ing is an intramolecular interaction. 004 1.0 points Assign the strongest relevant intermolecular force to the following species, respectively: RbCl , 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. II, IV, III, IV, IV 2. III, II, IV, III, III
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To (st22362) – Homework 1 – Fakhreddine – (52420) 2 3. III, IV, I, I, II 4. I, II, III, II, I 5. I, IV, III, I, II correct 6. I, II, IV, I, III 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 1.0 points What is the strongest evidence for hydrogen bonding? 1. Hydrogen has an extremely low elec- tronegativity. 2. Hydrogen is able to accept or donate elec- trons, so it is the most versatile atom in the periodic chart. 3. Hydrogen can be considered either a metal or nonmetal. 4. The boiling points of NH 3 , H 2 O, and HF are abnormally high compared with the rest of the hydrides in their respective periods.
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  • Fall '10
  • McCord
  • Chemistry, Mole, Intermolecular force, Van der Waals force

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