5_Chapt8_1 - Chapter 8 outline Chemical Bonding Ionic...

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Chapter 8 outline Ionic Bonding Lattice energy Exceptions to octet rule Mary J. Bojan Fall 2010 1 Covalent Bonding Bond Polarity Electronegativity Lewis Structures drawing Lewis structures deciding between alternate Lewis structures: formal charge resonance structures exceptions to the octet rule Bond properties Bond length, bond energy Chemical Bonding
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3 forms of bonding IONIC electrons traded to form separate ions Mary J. Bojan Fall 2010 COVALENT electrons shared between a few nuclei distinct molecules METALLIC electrons shared among all nuclei 2
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For ionic and covalent bonding: Mary J. Bojan Fall 2010 3 1. Valence electrons are involved in bonding 2. Octet rule: elements tend to gain, lose or share electrons so as to gain an inert gas configuration. (Duet for H and He)
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IONIC BONDING Mary J. Bojan Fall 2010 4 Ionic bond is due to electrostatic attraction. Coulomb's Law: Electrons are exchanged to form separate ions with complete octets.
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IONIC COMPOUNDS Mary J. Bojan Fall 2010 5 Characteristics
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Ionic vs. Molecular Mary J. Bojan Fall 2010 6 Ionic compounds: a compound that consists of positive and negative ions. Metal + nonmetal (usually) Molecular compounds : compounds consisting of individual molecules All nonmetals or nonmetals and metalloids. Molecular compounds usually have low melting points Ionic compounds have high melting points and are brittle.
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Naming Inorganic Compounds and Ions Mary J. Bojan Fall 2010 7 Name Formula potassium ion CO 3 2 ammonium ion sodium bicarbonate H 2 SO 4 Combine Ca +2 and PO 4 3 Cu(II) and sulfate ion See Section 2.8 Tables 2.4, 2.5
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Mary J. Bojan Fall 2010 8 Lattice energy is the change in energy when an ionic solid is separated into isolated ions in the gas phase. Lattice energy cannot be determined experimentally
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This note was uploaded on 07/16/2011 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Spring '08 term at Penn State.

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5_Chapt8_1 - Chapter 8 outline Chemical Bonding Ionic...

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