BSC 1010C Lecture Notes - Lecture 3: Vaporization, Chemical Polarity, Gerridae
16 Sep 2016
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Document Summary
Medium for all chemical reactions of life. It is a polar molecule (electrons are pulled towards the oxygen) *hydrogen bonds form between molecules because the partial positives attract partial negatives* A measure of how dif cult it is to stretch or break the surface of a liquid. * i. e. a water strider remains supported on a water surface. The clinging of one substance to another. Water adheres to the surface of a narrow tube, rises against gravity. *cohesion of water molecules & adhesion to the sides of narrow conducting vessels allow water to move against gravity up a tree & through the leaves* * driving force - evaporation from leaf pulls water up. Speci c heat: amount of heat energy requires to raise temperature by one degree celsius. *for molecules to separate, many hydrogen bonds must be overcome* 580 calories are needed to evaporate 1g of water at 100 degrees c.
