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Warm-up

Warm-up. Grab a worksheet from the front table and start working on the front side (side with name: ______). Work on your own for ten minutes and I’ll let you ask for help. VSEPR Theory and Shapes. Unit Four, Day Three Kimrey 1 March 2012. VSEPR.

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Warm-up

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  1. Warm-up • Grab a worksheet from the front table and start working on the front side (side with name: ______). Work on your own for ten minutes and I’ll let you ask for help.

  2. VSEPR Theory and Shapes Unit Four, Day Three Kimrey 1 March 2012

  3. VSEPR • Stands for “Valence shell Electron pair Repulsion” • V-Valence • S-Shell • E-Electron • P-Pair • R-Repulsion

  4. What?? • Repulsion between valence electrons causes electron pairs to spread as far apart as possible • Lone (unshared) pairs of electrons occupy more space than shared pairs • VSEPR theory gives shape to covalent molecules • Basically, electron pairs want to be together and as far away from other pairs as possible, so we can predict shapes

  5. 5 Shapes • Tetrahedral- four single bonds • Trigonal Pyramidal- 3 single bonds and 1 lone pair • Trigonal planar – 2 single, 1 double • Bent- 2 bonds (any type) and lone pairs • Linear- 2 bonds no lone pairs or just 2 atoms ** Bonds and lone pairs off of the central atom!!

  6. Tetrahedral • Four bonding pairs and zero lone pairs

  7. Trigonal Pyramidal • Three single bonds and one lone pair of electrons.

  8. Trigonal Planar • Three bonds and no lone pairs

  9. Bent • Two bonds and lone pairs

  10. Linear • One or two bonding pairs and no lone pairs

  11. PracticeDraw the Lewis structure and predict the shape • CF4 • Tetrahedral • PH3 • Trigonal Pyramidal • SO3 • Trigonal Planar • H2O • Bent

  12. Predict the shape of the following • PF3 • TrigonalPyrimidal • SeO3 • Trigonal Planar • CBr4 • Tetrahedral • SF2 • Bent • SiO2 • Linear

  13. Review • What does VSEPR stand for? • List the five different shapes of molecules. • Predict the shape of the following: • H2S • O3 • CCl4

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