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APBioCh3
APBioLHSCh3: Water & Its Properties
| property | description | example of importance to life |
|---|---|---|
| adhesion | water molecules stick to other types of molecules | water can travel against gravity up plant vessel walls |
| cohesion | water molecules stick to each other | the pull of H2O molecules to each other helps them travel up inside plants |
| surface tension | the surface of water is harder than most liquids to break | some insects walk on water |
| high specific heat capacity | resists changes in temperature | water moderates temps on earth, ocean temps are stable |
| polarity | there is a slight separation of the positive and negative charge across a water molecule | polarity gives rise to ALL the other properties which make water the solvent of life |
| hydrogen bonding | slightly positive-charged H atoms of H2O are attracted to the slightly negative-charged oxygen atoms of OTHER H2O molecules | this property gives rise to cohesion, adhesion, lower density of ice, and evap. cooling |
| expands when frozen | water is less dense as a solid than as a liquid | ice floats, insulating liquid water below it |
| evaporative cooling | cools the surface of a liquid when it evaporates | thermo-regulating (homeostasis of body temp) of many animals depends on it |
Created by:
sedgar
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