BIOE 155, Fall 2009 PHYSICAL: Properties of water (light, color, heat) (read: pp 29-33; 38-39; 46-47 in Dodson) THE WATER MOLECULE •H20. A water molecule consists of two hydrogen atoms and a oxygen atom, in a “Mickey Mouse” type of arrangement. •Highly polar (positive pole and negative pole) •Hydrogen bonds—weak bonds between water molecules due to charges of water molecule. •Hydrogen bonds of water have many consequences, including: oViscous (stickiness between molecules) Water is ~100 times more viscous than air oBoundary layers—stickiness of water means that materials are surrounded by a microscopic layer of water that isn’t moving. oSurface tension—boundary between water and air Neuston—habitat at the air-water boundary oSolvent—water is a great solvent of other charged (polar) molecules Solubility of gases Temperature dependent O H H 104.5º- + Temperature (C) Oxygen solubility (mg L-1) 035501015
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