Ch_322a_2.010

Ch_322a_2.010 - Physical Properties and Molecular Structure...

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Physical Properties and Molecular Structure Intermolecular forces have a major influence on the physical properties of compounds. These forces arise from permanent and transient (temporary) electrical charges within structures that operate over short distances (several angstroms) and, therefore, are only important in the condensed phases (solids and liquids).
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Na (g) + + Cl (g) - NaCl (s) ! H lattice energy = -188 kcal/mol The lattice energy is the energy released when one mole of the ions condense from the gas phase into a solid structure. Ionic materials generally exist in well-ordered solid state structures of alternating positive and negative charges. The strong electrostatic attractive forces in the solid state are expressed as the Lattice Energy as defined in the example of sodium chloride. When ionic materials melt, the well-ordered crystalline solid changes into the more random (less ordered) liquid state with the partial loss of strong (stabilizing) ion-ion attractive forces. To achieve the less
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Ch_322a_2.010 - Physical Properties and Molecular Structure...

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