2_Chemistry - Chemistry of Life Home Page 2006: D. Julian...

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1 Chemistry of Life © 2006: D. Julian Home Page Hierarchy of biological order Life is organized into a hierarchy of structural levels, with additional “emergent properties” at each successive level. © 2006: D. Julian Chemical building blocks add Ca, P and K to reach >99%. C, O, H and N make up 96% of living matter… Life requires about 25 elements. © 2006: D. Julian
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2 Atoms and Molecules © 2006: D. Julian Electron orbitals of the first 18 elements The chemical behavior of an atom depends mostly on the number of electrons in its valence shell. © 2006: D. Julian Atoms combine by chemical bonding The strongest atomic bonds are: covalent bonds (produces molecules) and ionic bonds (produces salts). © 2006: D. Julian
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3 Covalent bonds Two atoms sharing one pair of valence electrons. This creates a molecule . Many atoms can simultaneously form covalent bonds with more than one other atom. © 2006: D. Julian Campbel and Reece, Figure 2.11 Polar vs. non-polar covalent bonds A covalent bond between two atoms with similar electronegativity will produce a non-polar bond. If the electronegativity differs, the electron(s) will not be shared equally. This produces a charge difference. Bigger differences lead to bigger charges. © 2006: D. Julian
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This note was uploaded on 04/12/2008 for the course BSC 2010 taught by Professor Bowes during the Spring '08 term at University of Florida.

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2_Chemistry - Chemistry of Life Home Page 2006: D. Julian...

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