10-29-07%20-%20Lecture%2010%20-%20Chapter%202

10-29-07%20-%20Lecture%2010%20-%20Chapter%202 - CHEMICAL...

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CHEMICAL CHEMICAL BONDS BONDS Cocaine Cocaine water water BF BF 3 aspirin aspirin
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Chemical Bonding Chemical Bonding Problems and questions: How is a molecule or polyatomic ion held together? How are atoms distributed in a compound? Can we predict the structure? How is structure related to chemical and physical properties?
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Why Form Bonds? Why Form Bonds? Atoms form bonds by gaining, losing, or sharing enough electrons to achieve the electron configuration of the Noble Gases Bond — result of the attraction between 2 or more atoms or ions, the link between atoms Bonding occurs because it lowers the energy of the system.
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Forms of Chemical Bonds Forms of Chemical Bonds There are 2 extreme forms of connecting or bonding atoms: Ionic complete transfer of 1 or more electrons from one atom to another Usually between a metal and non-metal Covalent some valence electrons shared between atoms Usually between two or more non-metals Most bonds are somewhere in between.
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Ionic Bonds Ionic Bonds Essentially the complete electron transfer from an element of low ionization energy (metal) to an element of high electron affinity (nonmetal) Na(s) + Cl(g) Na + + Cl - Therefore, ionic compounds exist primarily between metals at left of periodic table and nonmetals at right.
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NaCl: Ionic bond is formed due to the attraction between Ionic bond is formed due to the attraction between Na Na + + ions and Cl ions and Cl - - ions ions
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Lattice Energy How strongly are ions held together in ionic compounds? Lattice Energy – always positive
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This note was uploaded on 10/24/2009 for the course CHEM 234234234 taught by Professor Johnson during the Fall '08 term at UCSD.

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10-29-07%20-%20Lecture%2010%20-%20Chapter%202 - CHEMICAL...

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