Biology Chapter 3 Objectives

Biology Chapter 3 Objectives - Chapter 3 Water and the...

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Chapter 3 Water and the Fitness of the Environment The Properties of Water 1. a. Water molecules are polar due to their properties. b. Water is also capable of hydrogen bonding with four neighboring water molecules. 2. Water’s cohesive behavior, its ability to moderate temperature, its expansion upon freezing, and its versatility as a solvent are all emergent properties resulting from hydrogen bonding. 3. Cohesion is when hydrogen bonds hold substances together. Adhesion is the clinging of one substance to another. Due to the cohesion and adhesion of water, water is able to move from the roots to the leaves of a tree. Water molecules stay close to each other due to their cohesion in the water-conducting cells in the trunk. Then, as water evaporates from a leaf, the hydrogen bonds cause water molecules to leave the veins to tug on molecules further down. The upward pull is transmitted all the way down to the roots. Adhesion is what causes the cell walls to counter the pull of gravity. 4. Heat is a measure of the total amount of kinetic energy due to molecular motion in a body of matter. Temperature measures the intensity of heat due to the average kinetic energy of the molecules. An example is how an ocean contains more heat than a swimmer due to its volume, but a swimmer has a higher temperature than
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This note was uploaded on 08/29/2009 for the course BIOL 101 taught by Professor Sakji during the Fall '08 term at Linn Tech.

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Biology Chapter 3 Objectives - Chapter 3 Water and the...

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