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properties of water

ap bio unit one powerpoint 2

PropertyDefinition
Polarity unequal sharing of electrons causes water to be polar -causes adhesion
Cohesion attraction of one molecule to another molecule of the same kind -causes water to move together
Adhesion clinging one one molecule to another of a different kind -causes polarity -allows water to cling to cell wall within plants and resist gravity pull
Hydrogen Bonds -exist between each H2O molecule -increases cohesive forces -allows for water to transport in plants against gravity -causes surface tension
Capillary Action -upward movement of water as a result of cohesion, adhesion, and surface tension -occurs when adhesion is greater than cohesion
Temperature Control/High Specific Heat -resists changes in temperature as a result of hydrogen bonds -heat absorbed to break hydrogen bonds, released when bonds form -large bodies absorb heat and release during night (moderate air temp and stabilize ocean temp) -H2O in organisms resist temp
Evaporative Cooling/High Heat of Vaporization -result of high specific heat -high kinetic energy molecules leave as gas -moderate earth's climate -stabilize lake and pond temperature -prevents overheat and burn of terrestrials and plants
Floating Ice -H20 solidifies as it expands bc of hydrogen bonds -frozen H2O moves too slowly to break bond -marine continue to life live under ice sheets -ice eventually melts again, cycle
Versatile Solvent -polar molecules attracted to ions and others to hydrogen bonds -dissolves solute
"Like Dissolves Like" -water interacts with sugars/proteins containing Hydrogen and Oxygen -water will form hydrogen bonds with sugar or protein
Ionic Compounds -partially negative oxygen will interact with a positive atom -partially positive hydrogen will interact with negative atom
Created by: 26salisburb
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