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Molecular Shapes A Look at the Geometry of Some Molecules

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Page 1: Molecular Shapes A Look at the Geometry of Some Molecules

Molecular Shapes

A Look at the Geometry of Some Molecules

Page 2: Molecular Shapes A Look at the Geometry of Some Molecules

Domains

Sets of electrons that are either bonded or unbonded

Page 3: Molecular Shapes A Look at the Geometry of Some Molecules

VSEPR

Electron pairs (either bonded or unbonded) will attempt to get as far apart from each other as possible.

Valence Shell Repulsion

Theory

PairElectron

Page 4: Molecular Shapes A Look at the Geometry of Some Molecules

1 bonding domain, H2

VSEPR TYPE: A2

Bond Angle: 180°

Shape: Linear

H H

Page 5: Molecular Shapes A Look at the Geometry of Some Molecules

Two bonding domains, CO2

Shape: LinearBond angle: 180°

180° CO O

VSEPR TYPE: AB2

Page 6: Molecular Shapes A Look at the Geometry of Some Molecules

Three bonding domains, BBr3

Shape: trigonal planerBond angle: 120°

120°

BBr Br

Br

VSEPR TYPE: AB3

Page 7: Molecular Shapes A Look at the Geometry of Some Molecules

Four bonding domains, CH4

Shape: tetrahedralBond angle: 109.5°

109.5° CH H

H

H

VSEPR TYPE: AB4

Page 8: Molecular Shapes A Look at the Geometry of Some Molecules

Four domains, NH3

three bonding, one nonbonding

Shape: trigonal pyramidBond angle: <109.5°

<109.5°

NH H

H

VSEPR TYPE: AB3E

Page 9: Molecular Shapes A Look at the Geometry of Some Molecules

Four domains, H2OTwo bonding, two nonbonding

Shape: BentBond angle: <109.5°

<109.5°

OH H

VSEPR TYPE: AB2E2

Page 10: Molecular Shapes A Look at the Geometry of Some Molecules

Sulfur dioxide, SO2

S O

ONumber of domains?

Number of non-bonding domains?Number of bonding domains?

3

21

Angles? 120°

Shape? Bent

Page 11: Molecular Shapes A Look at the Geometry of Some Molecules

Five bonding domains, PF5

Shape: trigonal bipyramidBond angle: ?,?

PFF

F

F

F

Page 12: Molecular Shapes A Look at the Geometry of Some Molecules

Six bonding domains, SF6

Shape: octahedralBond angle: ?,?

SF F

F

F

FF

Page 13: Molecular Shapes A Look at the Geometry of Some Molecules

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