Water: the molecule of life
Bio I H Packet 1
Intramolecular properties of
water
Intermolecular properties of
water
Emergent properties
of waterCohesion
Surface tension
Emergent properties
of waterAdhesion
Emergent properties of water
Cohesion + Adhesion capillary action
Emergent properties
of water“Universal solvent”
Emergent properties
of waterUnique density as a solid compared to a liquid
Why is “ice floats” important?
Oceans & lakes don’t freeze solidsurface ice insulates water below
allowing life to survive the winterif ice sank…
ponds, lakes & even oceans would freeze solidin summer, only upper few inches would thaw
Emergent properties of water: specific
heatH2O resists changes in temperaturehigh specific heat takes a lot to heat it uptakes a lot to cool it down
H2O moderates temperatures on Earth
Specific heat& climate
Evaporative cooling
Organisms rely on heat of vaporization to remove body heat
Emergent properties of water: high heat of
vaporization
Elixir of LifeSpecial properties of water1. cohesion & adhesion
surface tension, capillary action2.good solvent
many molecules dissolve in H2O3.lower density as a solid
ice floats!4.high specific heat
water stores heat5.high heat of vaporization
Heats slowly