101D_FA09_wk07_doc1

101D_FA09_wk07_doc1 - 101D week 7, doc1 Section Day, Time:...

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101D week 7, doc1 Section Day, Time: Thursday 1-3 Team: plutonium Manager:Ashly McClure Blogger: Scribe: Shomaila Shaikh Researcher: Marcus Garcia Molecular Shapes ~ Shape up or ship out! ~ GOALS Understand Valence Shell Electron Pair Repulsion (VSPER) theory Understand electron domain geometry Be able to visualize molecular shapes SKILLS Distinguish between electron domain geometry and molecular shape Predict molecular shape from Lewis structure Nature has a tendency to seek the lowest energy state, which is often the most stable. Hence, molecules are configured to minimize the interaction of the repulsive energy of electron pairs. INFORMATION VSEPR – The bonding and nonbonding (lone pair) electron domains in the valence shell of an atom seek an arrangement that minimizes repulsion and thereby determine the geometry of a molecule. Electron Domain – A region around an atom where one or more electron pairs are present. Electron domains can be either bonding or nonbonding domains, and these domains influence molecular shape. Bonding Domain – A region between two atoms that contains one or more electron pairs (i.e., single or multiple bonds), which influence molecular shape. Nonbonding Domain – A region in the valence shell of an atom that holds an unshared pair of electrons (i.e., lone pair), which influence molecular shape. Bond Angle – The angle formed by two bonds that extend from the same atom. 1
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Lewis structure, electronic structure, electron arrangement and electron geometry are all used to describe how electron domains are positioned in a molecule. How Far Away Can I Get From You? For the following question use a Styrofoam ball (planet Earth or an atom) and the toothpicks (people or electron domains). REMEMBER: If the toothpicks are electron domains, they desire to be as far apart as possible. 1. Paul R. Bond and Kemika L. Bond are both world-famous archaeologists who were once married. Their huge egos have led to many a squabble and a divorce. In order to minimize their interactions, they tend to work as far apart from one another as possible. If the ball is Earth, arranges two toothpicks as far apart as possible. What is the shape of your arrangement when only two people (or electron domains) are involved? What is the angle between the toothpicks? Linear and it is 180 degrees. 2. There was also another woman involved (Lorna Pierre), and everyone would rather stay out of each other’s way. Arrange Paul, Kemika and Lorna to be as far apart on Earth as possible. What is the shape of your arrangement when three people (or electron domains) are involved? What is the angle between the toothpicks? Planar Triangular and the angle is 120 degrees.
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101D_FA09_wk07_doc1 - 101D week 7, doc1 Section Day, Time:...

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