BIOL 2100 Lecture Notes - Lecture 3: Ocean Acidification, Molecular Mass, Molar Concentration

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Polar covalent bonds in water molecules result in hydrogen bonding. Water molecule is shaped like a wide v with 2 hydrogen atoms joined to oxygen atom by single covalent bonds. Four emergent properties of water contribute to earth"s suitability for life: cohesive behavior. Linkages by multiple hydrogen bonds make water more structured cohesion: contributes to transport of water and dissolved nutrients against gravity in plants. Adhesion- the clinging of one substance to another: adhesion of water by hydrogen bonds to the molecules of cell walls helps center downward pull of gravity. Surface tension- a measure of how difficult it is to stretch or break the surface of a liquid: ability to moderate temperature. Moderates air temperature by absorbing heat from air that is warmer and releasing stored heat to air that is cooler. Contributes to stability of temperature in lakes and ponds: expansion upon freezing. Less dense as a solid than a liquid.

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