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Unit 1 -man is high 50s to 60 water -distribution in body divided into 3 compartments 1 intracellular - 28 litres 2 intercellularinterstitial fluid - 11 litres - 80 3 blood plasma - 3 litres - 20 -women contain less water than men -organisms can contain 60-80 water -bacteria have lots of water -fat cells have little -waters properties result from its structure and molecular interactions -water is polar -polar covalent bonds and asymmetrical shape give it opposite charges on opposite sides -electrons spend more time around O giving H a slight positive charge -hydrogen bonds form between the oxygen of one molecule and the hydrogen of another -cohesion substance being held together by hydrogen bonds -hydrogen bonds are transient yet enough is always held together to give water more structure than almost any other liquid -beads and meniscus formed by cohesion also helps upward transport of water in plants -adhesion counteracts downward pull of gravity -water has greater surface tension than most liquids -surface molecules are hydrogen bonded to molecules below and around them -surface tension can hinder life ie beading in the alveoli of lungs -makes water unwettable -surfactants used to counteract this -water has a high specific heat which allows it to resist extreme temperature changes -has a high heat of vaporization that causes it to require alot of energy to change states -when sweating heat energy is utilized to change states from liquid to gas causing a drop in temperature -as a solid water is less dense than as a liquid and will float -charged regions of molecules have an electrical attraction to charged ions -water surrounds ions separating and shielding them from one another -polar compounds are generally soluble -charged regions of water are attracted to oppositely charged regions of other polar molecules -polar molecules are miscible in other polar liquids -most water molecules dont dissociate 1554 million do -hydrogen atom in hydrogen bond between the two
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