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Intramolecular Forces Intermolecular Forces

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Intramolecular Forces Intermolecular Forces

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    1. Intramolecular Forces Intermolecular Forces

    9. : Dipole-Dipole Forces: Only polar covalent molecules (have the ability to form dipole-dipole attractions between molecules.) Polar covalent molecules act as little magnets, they have positive ends and negative ends which attract each other.

    15. Properities due to Hydrogen Bonding Higher than expected melting/boiling points More viscous substances (liquids are “thicker” to pour) Surface tension – an inward pull that minimizes the surface area of a liquid. Capillary Action

    19. Surface tension

    21. London Dispersion Forces (D:\Intermolecular Forces PowerPoint\13M05AN3.AVI) These are the only types of forces that non-polar covalent molecules can form. They result from the movement of the electrons in the molecule which generates temporary positive and negative regions in the molecule.

    22. Van der Waals

    30. When chemical bonds break, it’s a chemical reaction 1 molecule ? 2 molecules When intermolecular forces break, it’s not a reaction 2 together ? 2 separated Intermolecular and Intramolecular forces

    36. Within molecules, covalent bonding Between molecules, intermolecular forces Molecules are held in place by intermolecular forces (weak-moderate) Properties Low to moderate melting point and boiling point Soft Non conductive

    41. Metallic Solid Infinite array of atoms held together by metallic bonding Metallic bonding is like positive metal ions in a sea of freely-moving negative electrons Metallic bonding is moderate to strong Properties: moderate-to-high melting point, boiling point may be hard or soft electrically conductive solid and liquid malleable, ductile lustrous

    45. Applications Solubility of Substances General Rule: Like dissolves like. Or polar substances dissolve other polar substances Or nonpolar substances dissolve other nonpolar substances

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