11 - CHM 11500 Covalent bonding and bond energies Lecture...

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1 CHM 11500 Covalent bonding and bond energies Lecture 11 Reading 6.2, 6.4, 9.3, 9.4,
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2 Electrostatic attraction and repulsion in covalent compounds H 1s orbital H 2 covalent bond
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3 Energy of H + H
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4 Parameters of a H 2 bond Bond Energy: Energy required to overcome the electrostatic attraction of a bond and separate its components as isolated atoms. Bond Length: Distance between nuclei at which potential energy is lowest.
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5 Question #1 Which statement is correct for the hydrogen molecule (H 2 ) at its optimal bond length? A. The total strength of the electron-nuclei attractions is greater than the repulsions (total of nucleus-nucleus and electron-electron repulsions). B. The total strength of the electron-nuclei attractions is equal to the repulsions (total of nucleus-nucleus and electron-electron repulsions). C. The total strength of the electron-nuclei attractions is less than the repulsions (total of nucleus-nucleus and electron-electron repulsions).
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6 Lewis Electron-dot Structures Number of dots = number of outer (valence) electrons Leave a maximum number unpaired. This is NOT the arrangement in some isolated atoms Rules: Depicting Valence Electrons in Main Group Atoms
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11 - CHM 11500 Covalent bonding and bond energies Lecture...

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