Ch. 6: Chemical Bonding II: Valence Bond and Molecular Orbital Theory

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27 Terms

1

Valence Bond Theory

Theory explaining bond formation via orbital interaction.

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2

Hybridization

Mixing of atomic orbitals to form new orbitals.

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3

Sigma Bond

Bond formed by head-on orbital overlap.

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4

Pi Bond

Bond formed by sidewise orbital overlap.

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5

sp3 Hybridization

Combination of one s and three p orbitals.

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6

sp2 Hybridization

Combination of one s and two p orbitals.

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7

sp Hybridization

Combination of one s and one p orbital.

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8

Bond Order

Half the difference between bonding and antibonding electrons.

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9

Paramagnetic

Substance with unpaired electrons, attracted to magnets.

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10

Diamagnetic

Substance with all paired electrons, repelled by magnets.

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11

LCAO Method

Linear combination of atomic orbitals to form MOs.

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12

Molecular Orbital Theory

Theory using wave functions to describe molecular bonding.

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13

Constructive Interference

Wave functions combine to lower energy, forming bonding MOs.

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14

Destructive Interference

Wave functions combine to raise energy, forming antibonding MOs.

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15

Bonding Molecular Orbital

Lower energy orbital formed by constructive interference.

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16

Antibonding Molecular Orbital

Higher energy orbital formed by destructive interference.

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17

Tetrahedral Geometry

Geometry with 109.5° bond angles and four groups.

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18

Trigonal Planar Geometry

Geometry with 120° bond angles and three groups.

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19

Octahedral Geometry

Geometry with 90° bond angles and six groups.

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20

Bond Length

Distance between nuclei of bonded atoms.

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21

Bond Strength

Energy required to break a bond.

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22

Resonance

Delocalization of electrons across multiple structures.

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23

Magnetic Behavior

Response of a substance to a magnetic field.

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24

Quantum Mechanical Orbitals

Regions where electrons are likely found.

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25

Electron Spin Pairing

Electrons must have opposite spins in orbitals.

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26

Geometry of Molecules

Shape determined by orbital interactions and hybridization.

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27

Delocalization

Electrons shared across multiple atoms in a molecule.

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