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Journal Entry : November 18

Journal Entry : November 18. Draw Lewis structures for the following molecules: SCl 2 CNF . Molecular Geometry and VSEPR Theory. Whenever the atoms of a molecule bond together, the molecule takes on a particular shape.

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Journal Entry : November 18

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  1. Journal Entry: November 18 Draw Lewis structures for the following molecules: • SCl2 • CNF

  2. Molecular Geometry and VSEPR Theory • Whenever the atoms of a molecule bond together, the molecule takes on a particular shape. • Molecular geometry refers to the three-dimensional arrangement of a molecule’s atoms in space. • VSEPR theory is the model used to explain the shapes of molecules.

  3. VSEPR – Valence Shell Electron Pair Repulsion Theory. • The main idea of this theory is that electron pairs on the central atom of a molecule will position themselves in such a way as to minimize repulsion. • There are two types of electron pairs:  • bonding pairs (shared) • nonbonding pairs (unshared)

  4. Example – CH4 • 4 electron pairs • 4 bonding / 0 nonbonding pairs • molecular geometry = tetrahedral • bond angles are 109.5° • Example – NH3 • 4 electrons pairs • 3 bonding / 1 nonbonding • molecular geometry = trigonalpyramidal • bond angles are 107° • Why are bond angles less?

  5. Example – H2O • 4 electron pairs • 2 bonding / 2 nonbonding • molecular geometry = bent • bond angle = 104.5°

  6. VSEPR and Multiple Covalent Bonds • For the VSEPR model, multiple bonds are counted as one bonding pair when determining the shape of the molecule. • Example – CH2O • 3 electron pairs • 3 bonding / 0 nonbonding • molecular geometry = trigonal planar • bond angles = 120°

  7. Example – NOCl • 3 electron pairs • 2 bonding / 1 nonbonding • molecular geometry = bent • bond angles = approx. 120° • Example – CO2 • 2 electron pairs • 2 bonding / 0 nonbonding • molecular geometry = linear • bond angles = 180°

  8. Outcome Sentences After reflecting on today’s lesson, complete three of the sentence starters in your chemistry journal entry for today. Sentence Starters I’ve learned… I was surprised… I’m beginning to wonder… I would conclude… I now realize that…

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