CHEM101 Lecture 13: February 4: Introduction to Molecular Structure and Bonding, the Step-By-Step Approach to Writing Lewis Structures,
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CHEM101 Lecture 12: February 1: Bond order, names and formulas for chemical compounds, naming acids
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CHEM101 Lecture 13: February 4: Introduction to Molecular Structure and Bonding, the Step-By-Step Approach to Writing Lewis Structures,
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CHEM101 Lecture 14: February 6: Breaking the Octet Rule (continued), Formal Atom Charges, Resonance Structures, Electron Delocalization, Picking the Best Resonance Structures.
Document Summary
February 4: introduction to molecular structure and bonding, the step-by-step. Approach to writing lewis structures, the octet rule, breaking the octet rule, Electron deficient atoms, molecules with odd-electron atoms, expanded valence. Covalent bond: electrons are being shared between atoms. Electron pairs are referred to as shared pairs or bonding pairs. Single bond: there are only 2 electrons being shared. One pair has a bond order of 1. Double bond: sharing 4 electrons which will create two pairs which means a bond order of 2. Triple bond: sharing 6 electrons which creates 3 pairs and a bond order of 3. This is the structural formula for formaldehyde (ch 0) which demonstrates the symbol(s) of atoms. The bonds are demonstrated by lines, and each bond uses 2 electrons. The dots represent lone pairs that are not bonded to another electron. Adding in the bonds and lone pairs represents all the electrons in the system.
