BIOL 101 Chapter Notes - Chapter 3: Thermal Energy, Ice Cube, Hydrogen Bond
26 Sep 2016
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Of earth"s surface is covered by water. Only common substance to exist in the natural enviro as all 3 states of matter. Oxygen region of molecule has partial negative charge (s-) and hydrogen has partial positive (s+) When in liquid form, hydrogen bonds are very fragile, only about 1/20 as strong as covalent bonds. 4 emergent properties: cohesive behavior, ability to moderate temperature, expansion upon freezing, versatility as a solvent. Water molecules stay close to each other because of hydrogen bonding. Many molecules are linked by multiple hydrogen bonds: makes water more structured than most other liquids. Cohesion= hydrogen bonds hold multiple water molecules together: contributes to transport of water and dissolved nutrients against gravity in plants. Adhesion= clinging of one substance to another. Surface tension= measure of how difficult it is to stretch or break the surface of a liquid: water has unusually high surface tension, ex.
