Lec-25-Chap-11-1

Lec-25-Chap-11-1 - The Liquid State A liquid forms when a...

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1 1 Chapter 11: Liquids, Solids and Materials 2 The Liquid State A liquid forms when a gas condenses. •This occurs at low T (and/or high P ). Average intermolecular attraction > avg E k . Molecules are close together and in constant motion ± They have a distribution of speeds (and E k ) ± A few have enough E k to slide past each other. 3 Liquids are very hard to compress • Molecules are close together and resist moving closer. • Used as hydraulic fluids to transmit pressure. The Liquid State 4 The Liquid State Viscosity = Resistance to flow. • High viscosity = slow flow. ± low viscosity: water, ethanol, gasoline… ± high viscosity: honey, corn syrup … 5 High viscosity is caused by: Large intermolecular attractions. Large entanglement of molecules. Higher T = lower viscosity E k > E barrier required to move past another molecule. • Increase T = increase average E k . ± More molecules have E k > E barrier The Liquid State 6 Liquid molecules attract each other. Surface molecules experience unbalanced forces.
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This note was uploaded on 04/20/2008 for the course CHE 131 taught by Professor Kerber during the Spring '08 term at SUNY Stony Brook.

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Lec-25-Chap-11-1 - The Liquid State A liquid forms when a...

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