Chemistry160-page13

Chemistry160-page13 - water is less dense than liquid...

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Chemistry Concepts - 13 For example: Molecules of liquid water, when heated, can not move faster until the hydrogen bonds are broken; therefore it takes more heat energy to increase the temperature of water. Because of hydrogen bonding, it takes more energy to convert water to steam at its boiling point. Since it takes lots of energy to evaporate, and that energy must come from the surrounding liquid water, evaporation is a cooling process. The constant forming and breaking of hydrogen bonds in water provides for greater movement of the water molecules at lower temperatures. Water molecules do not form a rigid structure until 0 degrees Celsius is reached. Water molecules are densest at 4 degrees Celsius, which means that solid
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Unformatted text preview: water is less dense than liquid water, or ice floats. (This is also because of hydrogen bonding.) Liquid Water Ice What do these temperature properties mean for living organisms? Water provides a more stable environment, in terms of temperature, both inside and outside of cells, in a world of fluctuating temperatures. Life can occur in lakes in temperate areas, since the frozen ice at the top of the lake in winter serves to insulate the water below. Also, if ice sunk, the organisms might find themselves out of a home, flopping on the surface of a solid block of ice. .. The process of evaporation is used by many organisms to maintain appropriate body temperature. (Sweating, for example)...
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