Properties Important in Biology
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Life and Evolution
Cells:70-95%
Earth: 3/4
Three states
Ecosystems
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Hydrogen bonds intermolecular
Remember
charges for each
side-unequal
distribution
Electronegativity
of oxygen attracts
the positive
hydrogen
Transient
Earth is fit for Life
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Water sticks to Water
◦ Capillary action
 Sand and Soil
 Transpiration
◦ Surface tension
Water sticks to other surfaces
adhesion
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Transpiration
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Capillary Action
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Water to other molecules
Capillary action returns
Applications become important for athletes!
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Water resists temp
changes
Absorbs heat from air
that is warmer
Releases heat to air
that is cooler
Heat reservoir!
Oceans have relatively
stable temp/Coastal
areas stable
Marine environment is
stable
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Heat passes from
warmer to cooler
Ice absorbs liquid
heat
Water resists
temperature changes
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Heat that a liquid
absorbs to go
liquid to gas
Moderates
climates as oceans
evaporate and
then condenses to
form rain
Weather patterns
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Hottest molecules
leave, the surface
liquid left behind
is cooler
Contributes to
lake and pond
temp. and
prevents
terrestrial life
from overheating
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Expansion upon
freezing
Ponds and lakesthermal mixing
Temp drop 4000/expansionmolecules stop
moving
Floating ice
insulates life below
as it releases heat
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Water gathers
around polar
molecules
Each molecule in
cloud of water
◦ Sugar
◦ Salt
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Sodium +
Chloride Alternating ions
are held together
by electrical
charges
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Water forms
hydrogen bonds
with cellulose of
cotton
Towels dry you
off- water pulled
into the towel
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Solvent
Solute
Hydrophilic (ionic and polar
molecules/hydrophobic (nonpolar molecules)
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Biological Rx’s involve solutes dissolved in
water
Plasma- 90% water
Cells- 75-95% water
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Biological
solutions maintain
pH because of
buffers
Acids: increase H+
Bases: reduces H+
Buffers
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Light Penetrates
◦ Tissues
◦ Aquatic
environments
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Fossil fuel burning creates sulfer oxides and
nitrous oxides+ water=strong acids in rain
Coal production more oxides+wind= carry
acids for miles as rain
Fossil fuel burning creates carbon dioxide
◦ Reflective blanket preventing heat escape
◦ Absorbed by oceans