1aa3-2010-tut9-answerkey

1aa3-2010-tut9-answerkey - CHEMISTRY 1AA3 March 15-19, 2010...

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CHEMISTRY 1AA3 March 15-19, 2010 TUTORIAL PROBLEM SET 9 Solutions ______________________________________________________________________________ 1. How does each of the following affect the rate of evaporation of a liquid in an open dish? (a) Intermolecular forces (b) Temperature (c) Surface area SOLUTION As the intermolecular forces increases the rate of evaporation decreases. As temperature increases, the rate of evaporation increases. As the surface area increase, the rate of evaporation increases. 2. When wet laundry is hung on a clothesline on a cold winter day it will freeze but will eventually dry. Explain the observation. SOLUTION Sublimation will occur, allowing H 2 O(s) to convert directly to H 2 O(g), without having to form H 2 O(l). 3. Identify the most important types of intermolecular forces present in the following substances. (a) NH 3 (aq) H-bonding (b) NO Dipole (c) BF 3 Dipole (d) HF H-bonding (e) cyclohexane Dispersion (f) carbon monoxide Dipole 4. Indicate which of the following compounds should have the higher melting point. Explain
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1aa3-2010-tut9-answerkey - CHEMISTRY 1AA3 March 15-19, 2010...

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