ERSC 1F90 Lecture Notes - Lecture 9: Molecular Geometry, Surface Runoff, Chemical Polarity
9 Apr 2015
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Document Summary
Water is a covalently bonded (when electrons are shared) polar molecule and hydrogen bonds between water molecules result in strong cohesion, adhesion, surface tension and capillary action. Asymmetry in water makes it electrically asymmetrical (polar) and acts like a magnet the result: dipole electrostatic hydrogen bonding. Water is a tasteless, odorless, transparent liquid at ambient t & p, whose triple point (occurs in all three states) occurs naturally on earth"s surface. Triple point: where all three states are in perfect equilibrium; just off of 0o. The hydrologic cycle is a continuous sun-driven process in which water is transported from the oceans to the atmosphere to the land and back to the sea. Average salinity of seawater is 3. 5% by weight. Many of water"s physical properties depend on the concentration and composition of solutes. Salinity: concentration of solutes (dissolved inorganic solids/ions: commonly measured indirectly, as a function of its electrical conductivity.
