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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
Journal Entry: November 18

Draw Lewis structures for the following molecules:

  • SCl2
  • CNF
molecular geometry and vsepr theory
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.
slide3

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)
slide4

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?
slide5

Example – H2O

    • 4 electron pairs
    • 2 bonding / 2 nonbonding
    • molecular geometry = bent
    • bond angle = 104.5°
vsepr and multiple covalent bonds
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°
slide7

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°
outcome sentences
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…