Chemistry160-page12 - known as adhesion This property...

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Chemistry Concepts - 12 Water in Biochemical Reactions The breakdown and assimilation of many molecules of living organisms involves water. Water is needed to breakdown carbohydrates, lipids and proteins during digestion. The formation of large biological molecules from smaller building blocks releases water. Cohesion property of water A substance placed under sufficient tension will eventually rupture or be broken apart. Cohesion is the ability to resist rupture. The hydrogen bonds of water provide for good cohesion which results in a high surface tension for water. Cohesion allows for organisms to "walk on water surfaces" and allows for water to be drawn up to the tops of plants, even the tallest trees. Adhesion property of water Water molecules are often attracted to other polar substances, a property
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Unformatted text preview: known as adhesion. This property provides for capillary action, the manner in which water "creeps" up the surfaces of tiny tubes, or "wicks" up paper and other surfaces. Temperature moderating property of water • Temperature is a measure of the rate of molecule movement of some piece of matter • Heat is a measure of the amount of energy which results from the movement of molecules in some piece of matter. • Because water has hydrogen bonding it has: • A high specific heat, the amount of energy needed to increase the temperature of 1 gram of a substance 1 degree Celsius • A high heat of vaporization, the amount of heat energy needed to change a liquid to a gas (or evaporate) • A high heat of fusion, the energy needed to convert a substance from a liquid to a solid....
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