3 Water & Carbon 8-27-07

3 Water & Carbon 8-27-07 - 8/27/07 Water and Carbon in...

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8/27/07 Water and Carbon in Biology Structure of Water *Covalently bound *Polar molecule Hydrogen bonding *Occurs between Hydrogen of one water molecule with Oxygen of another *One molecule may make Hydrogen bonds to 4 other molecules *Weak and transient bonding (1/20th as strong as a covalent bond) Cohesion/Adhesion *Water molecules bond together (cohesion) *Allows capillary flow of water *Allows surface tension *Water molecules bond to other surfaces (adhesion) *Allows water to cling to vertical surfaces Thermodynamics of Water *Water requires a lot of energy to heat it *Buffers temperature of ponds, lakes, oceans and organisms *1 cal=the energy to raise one gram of water one degree *Evaporation of water results in cooling of surfaces *Most active molecules become vapor leaving a less active environment Expansion upon Freezing *Hydrogen bonds form lattice structure near 4°C *Results in decrease in density (10%) *Ice floats on surface of water *Prevents permanent freezing of bodies of water
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This note was uploaded on 04/10/2008 for the course BSC 197 taught by Professor Nichols during the Fall '07 term at Illinois State.

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3 Water & Carbon 8-27-07 - 8/27/07 Water and Carbon in...

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