Lecture02-Ch02+Life+Chemistry+and+Energy

Hydrophilic waterlovinginaqueoussolutionspolar

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Unformatted text preview: ORM MOLECULES A lot of heat is required to raise the temperature of water—the heat energy breaks the hydrogen bonds. In organisms, presence of water shields them from fluctuations in environmental temperature. 15 CONCEPT 2.2 ATOMS INTERACT AND FORM MOLECULES Water has a high heat of vaporization—a lot of heat is required to change water from liquid to gaseous state. Thus, evaporation has a cooling effect on the environment. Sweating cools the body—as sweat evaporates from the skin, it transforms some of the adjacent body heat. CONCEPT 2.2 ATOMS INTERACT AND FORM MOLECULES • Hydrogen bonds also give water cohesive strength, or cohesion—water molecules resist coming apart when placed under tension. • This permits narrow columns of water to move from roots to leaves of plants. 16 CONCEPT 2.2 ATOMS INTERACT AND FORM MOLECULES Any polar molecule can interact with any other polar molecule through hydrogen bonds. Hydrophilic (“water‐loving”)—in aqueous solutions, polar molecules become separated and surrounded by water molecules Nonpolar molecules are called...
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This note was uploaded on 01/31/2014 for the course BSC 2010 taught by Professor Bowes during the Winter '08 term at University of Florida.

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