Liquids and solids

Liquids and solids - Liquids, Solids Solids Liquids and and...

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Liquids and Solids Introduction to Chemistry Liquids, Solids and Intermolecular Forces Introduction to Chemistry
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Intermolecular Forces Attraction between molecules Van der Waals Forces Dipole Forces – dipole-dipole attraction Solid->Liquid->Gas Boiling points – the stronger the force => higher T Molecular mass – The higher the mass => the stronger the force and higher the b.p. Hydrogen Bonding – special case of strong dipole attraction between neighboring molecules London Dispersion Forces – weak temporary dipole attractions in nonpolar molecules –i.e., 2 , He, CH 4 etc… Increase w/ molecular mass, Decrease w/ distance
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Polar Covalent Bonds Atom with higher electronegativity has a greater attraction for the shared electrons Dipole – imbalance caused by electron pair being drawn closer to the higher electronegativity atom (negative end), and away from the lower electronegativity atom (positive end) Asymmetrical charge distribution
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Hydrogen Bonding Highly Polar Covalent Liquid Molecules like: H 2 0 (Water), HF and NH 3 form a dipole (i.e., + and - dipole); H w/ N, O and F These Polar Molecules can form an extra intermolecular attractive force called hydrogen bonding – responsible for higher
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Liquids and solids - Liquids, Solids Solids Liquids and and...

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