20070924 Night Lecture 06

20070924 Night Lecture 06 - Welcome to CHM 1220/1225 Please...

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1 Welcome to CHM 1220/1225 Please turn off cell phones pages iPods Thank you! Pre-lecture Assignment 06 will be available at 7:00 p.m. today and is due by 5:00 p.m., Monday, October 1, 2007. Chapter 9 Quiz is due by 5:00 p.m., Monday, October 1, 2007. Chapter 9 Homework is due by 5:30 p.m. Monday, October 1, 2007. Chapter 10 Quiz is due by 5:00 p.m. Monday, October 8, 2007. Chapter 10 Homework is due by 5:30 p.m. Monday, October 8, 2007. Pre-lecture Assignment 10 will be available at 2:00 p.m. today and is due by noon, Monday, October 1, 2007. Chapter 10 Quiz is due by noon, Friday, October 5, 2007. Chapter 10 Homework is due by 12:50 p.m. Friday, October 5, 2007 Chapter 10 Homework Due by 12:50 p.m. Friday, October 5, 2007 Recommended ACE Practice Tests 10-1: All but 9 10-2: All but 12, 13 (challengers!) 10-3: All but 19, 20 (challengers!) Chapter 10 Homework Due by 12:50 p.m. Friday, October 5, 2007 --Continued-- Required Conceptual Problems: 10.17, 10.18, 10.21, 10.22, 10.23, 10.24, 10.25, 10.26 General Problems: odd numbers 10.59-10.75 Cumulative Skills Problems: 10.77, 10.78, 10.81, 10.82, 10.83 Chapter 9 Ionic and Covalent Bonding Ionic Bonds 1. Describing Ionic Bonds 2. Electron Configurations of Ions 3. Ionic Radii
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2 Covalent Bonds 4. Describing Covalent Bonds 5. Polar Covalent Bonds; Electronegativity 6. Writing Lewis Electron-Dot Formulas 7. Delocalized Bonding: Resonance 8. Exceptions to the Octet Rule 9. Formal Charge and Lewis Formulas 10. Bond Length and Bond Order 11. Bond Energy What energies are involved in forming an ionic compound? This energy, the lattice energy (energy released when gaseous ions form a solid ionic compound) is very difficult to measure. We can, however, break this into steps that give us this result. Figure 9.3: Born-Haber Cycle for NaCl Figure 9.2: Energetics of Ionic Bonding Not all bonds can be ionic. Hydrogen, H 2 , is a clear example in which there is a strong bond between two like atoms. The bonding in the hydrogen molecule is covalent. A covalent bond forms between atoms by the sharing of a pair of electrons. A covalent bond is chemical bond formed by the sharing of a pair of electrons between atoms.
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3 Figure 9.11: Potential Energy Curve for H 2 Figure 9.10: The Electron Probability Distribution for the H 2 Molecule Atoms will share electrons in order to achieve access to a noble gas configuration. This tendency of atoms in a molecule to have eight electrons in their outer shell is called the octet rule .
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This note was uploaded on 04/27/2008 for the course CHEM 1220 taught by Professor Barber during the Fall '08 term at Wayne State University.

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20070924 Night Lecture 06 - Welcome to CHM 1220/1225 Please...

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