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MOTheory - Bonding in molecules and solids Where were...

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Bonding in molecules and solids How are atoms held together in molecules and solids? How does this contribute to the properties of a molecule or solid? Magnetism (unpaired vs. paired electrons) Electrical (metals, semiconductors, insulators) Mechanical (hardness, strength) Thermal (melting / boiling / decomposition) Where we’re heading: The chemistry of modern materials (extended solids), after a brief look at some key aspects of bonding in molecules (molecular orbitals) Bonding in Materials 1
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Lewis dot structure for O 2 Are the electrons paired or unpaired? Based on this structure: would you predict O 2 to be paramagnetic or diamagnetic ? Fractional Distillation of O 2 from air Air contains (by volume): 78.08% N 2 (bp = 77 K) 0.93% Ar 20.95% O 2 (bp = 90 K) 0.038% CO 2 What is happening in the experiment? What does this tell us about the Lewis dot structure of O 2 ? Bonding in Materials 2
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Review of Covalent Bonding Each orbital holds 2 electrons Orbital probability of finding an electron Energy of electron: energy needed to remove an electron from the orbital Bonding in Materials 3
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