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APchapter3notes - Chapte 3 Note r s Wate and theFitne of...

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    Chapter 3 Notes Water and the Fitness of the Environment
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    Concept 3.1 Water is a polar molecule, opposite ends  have opposite charges. A slightly  positive hydrogen is attracted to a  slightly negative oxygen of a nearby  molecule. The two molecules are held together by a  hydrogen bond
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    Concept 3.1 Hydrogen bond δ H δ + H O —— δ + δ + δ + δ δ δ
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    Concept 3.2 Water will stick to each other with hydrogen  bonds (1/20 th  as strong as covalent  bonds). Results of Hydrogen bonds 1)  Cohesion : when a substance (water) is  held together by hydrogen bonds 2)  Adhesion : the clinging of one substance  to another
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    Concept 3.2 Water-conducting cells Adhesion Cohesion 150 µm Direction of water movement
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    Concept 3.2 3)  Surface tension : measure of how  difficult it is to stretch or break the  surface of a liquid. - arrangement of hydrogen bonds  between water molecules on surface  and below
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    Concept 3.2
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    Concept 3.2 4) Water stabilizes temperatures because  of its high specific heat.
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