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CHEM 111 (69)

Bond and molecular polarity, intermolecular forces, gas laws

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Colorado State University
CHEM 111
Dana Johnson

15 November Announcements Review tonight 6 pm in A101 Exam Wednesday 7 – 9 pm in Clark 9.5, 10.3, 12.1, 12.3, 5.1, 5.3, 5.4, 5.6, 4.1, 4.2, 4.3, 3.3 Model assignment Bond and molecular polarity Which molecules are polar? CO 32- NH 3 O 3 XeF 2 BrF5 You cannot see polarity from a resonance structure. You need to make the resonance hybrid. 2- CO 3 is trigonal planar It’s nonpolar, but there is bond polarity O 3s bent No bond polarity, no polarity at all (same atom, same electronegativity) XeF i2 linear Nonpolar. The two polar bonds point opposite directions and cancel each other out. Intermolecular forces Ethylene glycol has a molar mass of 62.07 g / mol and a boiling point of 198° C. What do you predict to be the bp of propanol with a comparable molar mass of 60.09 g / mol? Stronger forces in / between molecules / more force – higher boiling point Ethylene glycol is more able to hydrogen bond compared to propanol Boiling point of propanol is 98° C Less than ethylene glycol Which would have the higher boiling point? Ne or Kr? Kr Larger, affects
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