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Properties of Water

Properties of Water. http://www.sumanasinc.com/webcontent/animations/content/propertiesofwater/water.html. Biochemistry Ch. 6. Water (H 2 O) A. Polar molecule because it has an uneven distribution of charges. H. O. H. 1. This polarity occurs because H 2 O has two

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Properties of Water

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  1. Properties of Water • http://www.sumanasinc.com/webcontent/animations/content/propertiesofwater/water.html

  2. BiochemistryCh. 6 • Water (H2O) A. Polar molecule because it has an uneven distribution of charges. H O H

  3. 1. This polarity occurs because H2O has two opposite poles (like a magnet). 2. The electrons (-) prefer to hang out around the O, while the H’s are (+) because the protons are “exposed”

  4. Hydrogen Bonds- the bonds that form between the (-) side of one H2O and the (+) side of another H2O.

  5. Polarity & hydrogen bonding are responsible for several important properties of water, including:

  6. 1. Adhesion- the ability of water to stick to other surfaces.

  7. 2. Cohesion-the ability of water to stick to itself. Bodies of H2O would evaporate quickly without cohesion.

  8. 3. Surface tension- the formation of an elastic like membrane on the surface.

  9. 4. Capillarity- the ability of water to move through narrow tubes against gravity. H2O sticks to the sides of the tube (adhesion) and to itself (cohesion).

  10. In plants this is called transpiration. H2O sticks to the sides of the xylem(adhesion) and to itself (cohesion). As water evaporates out of the stomata, a “chain” of H2O is pulled from the roots. Stomata- small holes in the leaves of plants that allow air in and H2O out. Xylem- small tubes (like capillaries) in plants that move H2O.

  11. Transpiration • http://www.sciencemag.org/site/feature/misc/webfeat/vis2005/show/transpiration.swf

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