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Chemistry Bonding VSEPR and Bond Angle

Chemistry Bonding VSEPR and Bond Angle. Do Now: Take out HW to check CALCULATORS NOT REQUIRED PERIODIC TABLES REQUIRED. Stands for V alence S hell E lectron P air R epulsion T heory. Explains the 3-D shape of molecules. There are two main factors in a molecule’s shape:

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Chemistry Bonding VSEPR and Bond Angle

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  1. ChemistryBondingVSEPR and Bond Angle Do Now: Take out HW to check CALCULATORS NOT REQUIRED PERIODIC TABLES REQUIRED

  2. Stands for Valence Shell Electron Pair Repulsion Theory. Explains the 3-D shape of molecules. There are two main factors in a molecule’s shape: Electron Domain Geometry – how many places can electrons be found on the central atom? Bonding Domain Geometry – how many places can bonds be found? Comparing these two gives us a molecule’s shape. VSEPR Theory

  3. VSEPR theory states that electrons want to be as far apart from each other as possible. The number of electron domains, or how many “places” electron pairs are found, determines part of the 3-D shape. Double and triple bonds count as a single electron domain. Electron Domains

  4. The number of electron domains on an atom determines its electron geometry and bond angle: 4 electron domains – tetrahedral Bond angle: 109.5º 3 electron domains – trigonal planar Bond angle: 120º 2 electron domains – linear Bond angle: 180º Electron Domain Geometry

  5. Tetrahedral Electron Domain • Tetrahedral Electrons – 4 electron domains (4 places there are electrons on central atom) • Molecular Shapes (all bond angles 109.5º)

  6. Trigonal Planar Electrons • Trigonal Planar Electrons – 3 places electrons are found on central atom • Molecular Shapes (all bond angles 120º)

  7. Linear Electrons • Linear Electrons – 1 or 2 places electrons are found on central atom • Linear Molecule Shapes (all bond angles 180º) • Examples: CO2, H2

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