hw6 - Killough, Ian Homework 6 Due: Oct 26 2006, 4:00 pm...

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1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. The due time is Central time. This HW assignment is due Thursday, Oc- tober 26, by 4:00PM. 001 (part 1 oF 1) 10 points What are all oF the intermolecular Forces that are responsible For the existence oF ice? 1. London Forces 2. dipole-dipole, London Forces, and hydro- gen bonding correct 3. hydrogen bonding and dipole-dipole 4. dipole-dipole and London Forces 5. dipole-dipole and ion-ion Explanation: 002 (part 1 oF 1) 10 points ±or which oF the molecules A) O 2 B) CO 2 C) O 3 D) SO 2 will dipole-dipole interactions be important? 1. B and C only 2. C and D only correct 3. Another combination oF compounds 4. A and B only 5. A and D only 6. None has dipole-dipole interactions. 7. B and D only 8. All have dipole-dipole interactions. 9. A and C only Explanation: O 2 and CO 2 do not have dipole moments. 003 (part 1 oF 1) 10 points Which oF the Following molecules A) CH 3 OCH 3 C) CH 3 COOH B) CH 3 CH 2 OH D) CH 3 CHO are likely to Form hydrogen bonds? 1. A and B only 2. A and D only 3. A and C only 4. B and C only correct 5. All are likely to Form hydrogen bonds. 6. None Forms hydrogen bonds. 7. C and D only 8. B and D only 9. Another combination oF compounds Explanation: Only molecules with H attached to the electronegative atoms N, O, and ± can hy- drogen bond. OF the molecules given, only CH 3 COOH and CH 3 CH 2 OH have hydrogen attached to oxygen, so these are the only ones that can undergo hydrogen bonding. 004 (part 1 oF 1) 0 points Calculate the ratio oF potential energies For an ion-ion interaction For Li + and For K + with Cl - . The ionic radius oF Li + , K + , and Cl - ions are 58 pm, 138 pm, and 181 pm, respectively. 1.
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hw6 - Killough, Ian Homework 6 Due: Oct 26 2006, 4:00 pm...

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