#10 - Announcements I hope all the ARIS technical problems...

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Announcements: I hope all the ARIS technical problems were resolved by now. Still a few clicker issues…
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The last lecture’s coverage: Objectives for today: Intermolecular Forces (Review of 11.1, 11.2; 11.3-11.8) 64-68, 72-79, 81, 84, 93, 96, 97, 99, 108, 112, 121, 127, 132, 134, 142, 146. Additional recommended Problems: Intermolecular Forces (11.1, 11.2)
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Why is the hydrogen bond considered a “special” dipole-dipole interaction? Decreasing molar mass Decreasing boiling point 11.2
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Properties of Liquids Surface tension is the amount of energy required to stretch or increase the surface of a liquid by a unit area. Strong intermolecular forces High surface tension 11.3
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Properties of Liquids Cohesion is the intermolecular attraction between like molecules 11.3 Adhesion is an attraction between unlike molecules Adhesion Cohesion
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Properties of Liquids Viscosity is a measure of a fluid’s resistance to flow. 11.3 Strong intermolecular forces High viscosity
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Maximum Density 4 0 C Ice is less dense than water Density of Water 11.3 Water is a Unique Substance
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Two classes of Solids: Crystaline SiO 2 (quartz) Amorphous SiO 2 (quartz glass)
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lattice point At lattice points:
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#10 - Announcements I hope all the ARIS technical problems...

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