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The Properties of Water
“the liquid of life”
Water water everywhere and
not a drop to drink
Don’t go chasing waterfalls
Like a bridge over troubled water
Rain drops keep falling on my head
The fog creeps in on little cats feet
It’s Raining men!!!
I can see clearly now, the rain is gone
Water off a ducks back
Let the rain fall down and wake my dreams
If all the rain drops were lemon drops and gum drops, oh what a rain that would be
Cry m
e
a riv
er
Singing in the rain
You’re as cold as ice
Ice, Ice, baby
Smoke on
the water
Raining on Sunday
Walking on
water
Its like rain on your wedding day
I’m H
20
intolerant
Water is the essence
of wetness and
wetness is the
essence of beauty
Its raining its
pouring the old man
is snoring
Now that’s
some high
quality
H2O
Rain drops on roses..whiskers on kittens
When Chuck Norris goes swimming, he doesn’t get wet…
the water gets Chuck
Property of Water Definition and Mechanics Biological Implications
Cohesion Water molecules stick together due to H bonds
Transpiration in plants
Adhesion
Water molecules stick to other polar molecules due to H bonds
Transpiration in plants
Capillary movement
High Specific Heat
Water does not change temperature quickly due to hydrogen bonds preventing changes in molecular movement
“cooler by the lake”
Blood used as heat transport
High Heat of Vaporization
Water absorbs high quantity of heat before it turns to a gas due to hydrogen bonds
Evaporative cooling (Sweating)
Temperature stability in water
Less Density as a Solid
Ice floats because the hydrogen bonds maximize the distance between molecules
Keeps Aquatic organisms alive during the winter
High Surface Tension
Hydrogen bonds keep water molecules connected when exposed to air
Insects walk on water
Water stays together as “drops”
Solvent of Life
The polar nature of water can dissolve any polar molecule or isolate polar part on large molecules
A) Hydrophilic : Water loving (polar)
B) Hydrophobic: Water hating (non-polar)
Living things are 75% water. Most biologically active molecules are hydrophilic
03-02-WaterTransport.swf
YouTube - Jesus lizard
http://www.youtube.com/watch?v=k310d_egbFk
Real or Fake?
Lack of injury to participants brought to you by Hydrogen Bonds and the Emergent Properties of Water
1. What is pH?The measurement of the Hydrogen (or hydronium) ions found in a hydrophilic solution
2. Where do the H+ come from?A small % of water molecules dissociate into Hydronium (H3O+) and Hydroxide (OH-) ions
H030301.swf
H030302.swfHOH H+ + OH-
Water and pH
3. How is pH measured?
10 2 3 4 5 6 7 8 9 10
1112
13
14
Increasing H+(increasing Acid)
Increasing OH-(increasing Basic)
pH = -log H+
Pure water H+ = .0000001
or = 1x10-7
-log of = 71x10
-7
Therefore: The pH of pure water is 7The numbers on the pH scale are in 10X increments
4. What does pH have to do with Biology?
A) The pH of the environment can influence
biologically active molecules
1) influence chemical reactions
2) affect the interactions of hydrogen bonds3) determine the structure of proteins
5. How do living organism control pH?
a) Living organism use “buffers” to regulate pH b) Buffers work by donating or accepting H+
from the environment
1) organic “weak” acids
2) some proteins (albumin)
H2CO3
Increasing OH- HCO3 + H+
Increasing H+
Examples of buffers
Slide 2
Ice Water Steam Slide 2
Water Dissolving Ionic Molecules
Water Dissolving Large Molecules With Many Polar Functional
Groups
Slide 2