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Comparison of Gases, Liquids and Solids
Property\State Gas Liquid Solid Intermolecular Interaction Virtually none Considerable interaction Flow Fluid – free flow Fluid – nearly free flow Rigid – virtually none Actual/Occupied Volume Ratio Close to Negligible Slightly<1.00 Mode of Motion Virtually random translational motion Restricted translational motion Vibration about fixed sites only Simple Equation of State Yes No
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Phase Changes
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Dipole-Dipole Forces Solid and Liquid HCl
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Ion-Dipole Forces
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Formation of Induced Dipole in a Helium Atom
No induction in (a), since there are no ions or polar molecules in close proximity. Induction in (b) due to presence of near ion or polar molecule
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Induced Dipoles in Helium
The induced dipoles exist only momentarily. Nevertheless, at low enough temperatures, the generated dispersion forces are sufficient for helium to condense.
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Hydrogen Bonds in Water
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Surface Tension
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Capillary Action (a) Adhesion is higher (b) Cohesion is higher
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3-Dimensional Structure of Water
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Unit Cell and 3-D Depiction
3-D Structure
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Seven Types of Units Cells – Seven Crystal Systems
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Packing of Spheres – Simple Cubic Cell
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Packing of Spheres – Body Centred Cubic Cell
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Closest Packing – Two Arrangements
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Cubic Unit Cells
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Radii and Edge Length Relationships for Cubic Cell
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X-Ray Diffraction
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Crystal Structure of NaCl
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Diamond and Graphite – Covalent Crystals
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Properties of Crystals
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Vapour Pressure
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Vapour Pressure - Temperature
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A Typical Heating Curve
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Phase Diagrams
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