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Chapter_03_Water_and_the_Fitness_of_the_Environment - Basic...

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Basic Concepts Water is the most important substance necessary to the existence of life Every living organism carries some amount of water in it Water is the medium in which most vital chemical reactions are taken place Water is a polar molecule Only substance to exist in the natural world in the 3 physical states of matter: solid, liquid, and gas. Water - A clear, colorless, odorless, and tasteless liquid essential for most plant and animal life and the most widely used of all solvents. The water molecule is comprised of two hydrogen atoms and one oxygen atom, thus known as H20. Properties of water: Water is composed of two hydrogen atoms and an oxygen atom Water contains two covalent bonds (both are O-H bonds) The O end has a partial negative charge, whereas the two H ends have a slight positive charge. Freezing point 0 degrees Celsius and boiling point 100 degrees Celsius. Ice: Unlike most substances, the solid state of water is less dense than its liquid state, therefore allowing solid water to float on liquid water.
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