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Lecture 4 - BIOL104-04 Principles of Biology I Lecture#4 Ch...

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BIOL104-04 Principles of Biology I August 30, 2010 Lecture #4 Ch 2: The Nature of Molecules & the Properties of Water
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Overview Molecules form when atoms bond to each other Chemical bonds are formed by electron sharing The degree of electron sharing can vary Nonpolar covalent > polar covalent > ionic bonds
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Periodic Table of the Elements
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Basic structure of atoms Common elements in organisms have at least one unpaired valence electron Atoms are most stable when each electron orbital is filled Unfilled electron orbitals allow formation of chemical bonds
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The atoms in a molecule are joined by chemical bonds Bonds can happen when – Atoms with opposite charges attract each other – Two atoms share one or more pairs of electrons – Or when atoms interact in other ways
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Covalent Bonds Each atom’s unpaired electrons are shared by both nuclei to fill their orbitals
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Strength of Covalent Bonds
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IONIC BONDS Electrons are transferred from one ion to another
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Water: A Vital Compound
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The Properties of Water
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