Topic: Molecular Shape Do Now: Draw the Lewis Dot Diagram for N 2 and C 2 H 2.

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Presentation transcript:

Topic: Molecular Shape Do Now: Draw the Lewis Dot Diagram for N 2 and C 2 H 2

BONDING Capacity ELEMENT# of bonds it likes to make Halogen,F, Cl, Br, I1 Hydrogen1 O and S2 N and P3 C4

Molecular Shape H O H

Use the Lewis Structure Lewis structure is 2-D, but can help figure out 3-D shape

Molecular Shape Shape determined by two factors: 1. # of unpaired e - around the central atom 2. total # atoms bonded to central atom

It’s important to classify electron pairs as bonding or nonbonding Electron pairs repel each other: want to be as far apart from each other as can be Nonbonding pairs take up a little more room than bonding pairs

2-Atom Molecules Atoms located right next to each other linear molecules!

3-Atom Molecules linear or bent linear or bentLinear Bent

Lewis Structure of H 2 O = H:O:H.... H2OH2O 3 total atoms, free unpaired electrons = BENT

CO 2 Lewis structure: O :: C :: O total atoms, no free unpaired electrons = Linear

4 atom molecules They make triangles… …so we call them trigonal Planar or pyramidal

Trigonal Pyramidal = Free electrons around the central atom

4-Atom Molecules: Trigonal Planar = no free electrons around the central atom

4-Atom Molecules: Planar

5-Atom Molecules: H : C : H H H.... Tetrahedral

Molecular Polarity Look at structure and shape of molecule - all bent molecules are polar Draw a If top/bottom and left/right are same then NONPOLAR If either of the two are different then POLAR

SymmetricalMolecules  Nonpolar – they don’t have poles

AsymmetricalMolecules  Polar – they have poles (different ends)

Let’s try a few… Name the SHAPE and POLARITY

BENT POLAR

Trigonal Planar POLAR

Tetrahedral POLAR

Trigonal Pyramidal POLAR

linear POLAR

linear POLAR

bent POLAR

tetrahedral NONPOLAR