The extraordinary properties of Water Cohesion Adhesion High Specific Heat High Heat of Vaporization...
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Transcript of The extraordinary properties of Water Cohesion Adhesion High Specific Heat High Heat of Vaporization...
![Page 1: The extraordinary properties of Water Cohesion Adhesion High Specific Heat High Heat of Vaporization Less Dense as a Solid.](https://reader036.fdocuments.net/reader036/viewer/2022062720/56649f0e5503460f94c225c4/html5/thumbnails/1.jpg)
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The extraordinary properties of Water
• Cohesion• Adhesion
• High Specific Heat
• High Heat of Vaporization
• Less Dense as a Solid
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http://www.realeyz.com/photo/macro/photos/leaf_drops.jpg
CohesionCohesion is the property of water that causes it to be attracted to itself.
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•Surface tension measures the strength of water molecules attracting to one another.
•This property allows insects to walk on the surface of water and the creation of waves.
Surface Tension
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Water strider
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Capillarity Water molecules will “tow”
each other along when in a thin glass tube.
AdhesionAttraction between molecules of different substances
Ex: glass and water
http://staff.um.edu.mt/rlib1/sm/wpe32.jpg
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Surface Tension
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• Water will make hydrogen bonds with other surfaces such as glass, soil, plant tissues, and cotton.
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Cohesion-Adhesion Theory
-As water evaporates from leaves, it tugs on the water molecules below-Cohesion and adhesion pull water up and replace missing water molecules-Water enters the roots by osmosis
www.emc.maricopa.edu/.../BioBookPLANTHORM.html
Did you ever wonder: How does water move from roots to leaves when a tree doesn’t have a heart to pump the water?
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High Specific Heat
•Water resists temperature change, both for heating and cooling.
•Water can absorb or release large amounts of heat energy with little change in actual temperature.
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High Heat of Vaporization
• In order for water to evaporate, hydrogen bonds must be broken. As water evaporates, it removes a lot of heat with it.
•Thus, the heat of vaporization refers to the amount of energy required to convert water from a liquid to a gas.
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High Heat of Vaporization
• Water Vapor Imagery
Courtesty of http://www.goes.noaa.gov/
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Water is Less Dense as a Solid
•Which is ice and which is water?
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Density of Ice•Most solids are more dense than their liquids
•This makes solids sink
•Ice is less dense than liquid water
•Due to H-Bonds•Important to life because bodies of water freeze top down•Allows life to survive below
http://shiftingbaselines.org/blog/images/Iceberg.jpg
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Density of water
• If density of object is = to or < than water it will float.
• Displacement is how steel ships can float even though the density is greater.
• Density of pure water is 1.0• Density of pure ice is 0.92. • Density of sea water is 1.03.
• Icebergs are made of pure water will float with a ratio of more ice above the surface than that of an ice cube.
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pH ScaleMeasurement of the concentration of hydrogen ions
Acid:High concentration of [H+](or hydronium ion);low conc. of [OH-]
Base:High [OH-](a.k.a. hydroxide ion);low [H+]
pH = -log [H+]
Stomach Acid = pH 2
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Homeostasis
• Steady state
• Constant physiological condition of cells, organisms global ecosystems– a. Makes a good insulator– b. Resists temperature change– c. Universal solvent– d. Coolant
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• Hot water is a better cleaning agent because the lower surface tension makes it a better "wetting agent" to get into pores and fissures rather than bridging them with surface tension.
• Soaps and detergents further lower the surface tension.
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Bibliography• What are some examples of cohesion and adhesion? Asked by
LeRoy. http://www.physlink.com/Education/AskExperts/ae543.cfm. Viewed online on November 14, 2007.
• Surface Tension of Water. http://hyperphysics.phy-astr.gsu.edu/hbase/surten.html#c3. Viewed online on November 14, 2007.
• Water. http://courseweb.hopkins.k12.mn.us/file.php/432/Biochem/biochem_lectures_ppt/water.ppt#256,1,Slide 1
• Extroadinary Properties of Water. http://genbio.biol.vt.edu/tapages/russell/water.ppt