BIO152H5 Lecture Notes - Lecture 2: Hydrogen Bond, Ketose, Surface Tension

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9 Dec 2016
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Charged region in a water molecule are due to its polar covalent bonds. Oppositely charged regions of neighboring water molecules are attracted to each other forming hydrogen bonds. Each molecule can hydrogen-bond to multiple partners and these associations are constantly changing: properties of water arise from attractions between oppositely charged atoms of different water molecules. The slightly +ve h of one molecule is attracted to the slightly ve o if a nearby molecule. Water from the roots reaches the leaves through a network of water conducting cells. As water evaporates from leaves, h bonds cause water molecules leaving the veins to tug on molecules farther down and the upward pull is transmitted through water conducting cells: adhesion: clinging of one substance to another. Adhesion of water by h bonds to the molecules of cell walls helps counter the downward pull of gravity: surface tension: a measure of how difficult it is to break the surface of water.

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