BIO 121 Chapter Notes - Chapter 3: Hydrogen Bond, Hydrogen Atom, Heat Capacity

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Bio chapter 3: water and life outline. Overview: the molecule that supports all of life. Water is the substance that make all life possible on earth. All organisms are made mostly of water and live in an environment dominated by water. Water is the only common natural substance that exists in all 3 states: solid, liquid, gas. When water is in the solid state (ice) it floats on the liquid state (water) Water is a reactant in many chemical rxns of life. 3. 1 polar covalent bonds in water molecules result in hydrogen bonding. A water molecule: two hydrogen atoms joined to an oxygen atom by single polar covalent bonds. Oxygen is more electronegative than hydrogen, causing opposite sides of the water molecule to have opposite charges, therefore making it a polar molecule. Water had many properties because of the attraction between polar water molecules:

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