ERTH 2403 Lecture 5: feb 9
15 Aug 2015
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Document Summary
Water char. of water molecules chemical bonds and polarity heat exchange influence of density on ocean structure. Water molecules and chemical bonds polar molecule covalent bonding (shared electrons) Properties of water universal solvent (pulls apart ionic bonds; due to polarity) cohesive (high surface tension; hydrogen bonds) adhesive to other materials capillary action (cohesion + adhesion) Water temperature and density upon cooling water density increases. Maximum density = 1 gm/cm3 at 0 degrees sudden decrease in density ice is lighter than water ice increases in density as temp lowers ice density never reaches water density. Water = 105 degree angles ice = hexagonal crystal. 109 degrees is = wider spaces between molecules = less dense = ice floats. Change of state decrease in heat = sensible heat loss. 80 calories of heat must be removed from a gram of water at 0 degrees to form ice = latent heat of fusion latent = heat input without change in temperature.
