properties of water. water covers 2/3 of earth 97% saltwater oceans 2.4% ice (polar caps and...
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Properties of WaterProperties of Water
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Water covers 2/3 of Earth• 97% Saltwater oceans• 2.4% Ice (polar caps and glaciers)• 0.6% Surface water (lakes and streams)
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The Human body is made of ~80% water.• To function properly, the body requires between one and
seven liters of water per day to avoid dehydration; the precise amount depends on the level of activity, temperature, humidity, and other factors.
• Most of this is ingested through foods or beverages other than drinking straight water.
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Properties of WaterProperties of Water
Remember…. Water has 2 Remember…. Water has 2 hydrogen atoms and one oxygen hydrogen atoms and one oxygen atom atom H2O
OHH
_
++
Hydrogen bond(+)
(+)
H
H(+)
(+)
(–)
(–)
(–)(–)
O
Water is Water is polarpolar …. ….
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Properties of WaterProperties of Watercohesion
adhesion
High specific heat
density
pH
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Cohesion• The natural attraction of a water molecule to other
water molecule is called cohesion.
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Adhesion• The attraction of a water molecule to another polar
molecule is adhesion.
water droplets on a spider’s web (polar surface).
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Capillary Action
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Surface Tension• At the surface of the drop of water, water does not
attract to the air….. Surface tension
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Jesus Lizard
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Transpiration
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Properties of WaterProperties of Watercohesion
adhesion
High specific heat
density
pH
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Density
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Why is “ice floats” important??
if ice sank…..o eventually all ponds, lakes, and even ocean would freeze solid o during summer, only upper few inches would thaw
surface ice insulates water belowo allowing life to survive the winter
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Properties of WaterProperties of Watercohesion
adhesion
High specific heat
density
pH
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An example is the more moderate climate of a coastal location compared to one far inland.
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Properties of WaterProperties of Watercohesion
adhesion
High specific heat
density
pH
![Page 24: Properties of Water. Water covers 2/3 of Earth 97% Saltwater oceans 2.4% Ice (polar caps and glaciers) 0.6% Surface water (lakes and streams)](https://reader035.vdocuments.us/reader035/viewer/2022062600/5a4d1bc37f8b9ab0599d3c39/html5/thumbnails/24.jpg)
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pH
pH 7
pH 14
pH 0
neutral
More acidic…more H ions
More basic…more OH ions
water
Most biological fluids have a pH b/w 6 and 8 …. But stomach can reach a pH of 2
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Properties of WaterProperties of Watercohesion
adhesion
High specific heat
density
pH
![Page 27: Properties of Water. Water covers 2/3 of Earth 97% Saltwater oceans 2.4% Ice (polar caps and glaciers) 0.6% Surface water (lakes and streams)](https://reader035.vdocuments.us/reader035/viewer/2022062600/5a4d1bc37f8b9ab0599d3c39/html5/thumbnails/27.jpg)
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