chap11&13_bch1049_07MCWC1c

Chap11&13_bc - Intermolecular Forces(Chapters 11 and 13 Whats Ahead 1 States of Matter 2 Polarity of Bonds and Molecules 3 Types of

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1 Intermolecular Forces Intermolecular Forces (Chapters 11 and 13) What’s Ahead: 1. 1. States of Matter States of Matter 2. 2. Polarity of Bonds and Molecules Polarity of Bonds and Molecules 3. 3. Types of Intermolecular Forces 4. 4. Boiling and Melting Points Boiling and Melting Points 5. 5. Solutions and Factors affecting Solubility Solutions and Factors affecting Solubility States of Matter: A Molecular Comparison ¾ Energy (kinetic) of particles (atoms, ions, molecules) ? ¾ Nature and strength of bonding between particles ?
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2 Electronegativity and Dipole Moments Polarity of Molecules
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3 Polarity of Molecules in the Environment WEAKLY POLAR TO NON POLAR (c.f. PCBs) Herbicide 2,4-D H O dominates molecular dipole Cl -NH 3 + ¾ H 2 O is a very important substance/solvent and plays major role in distribution of chemicals in the environment. ¾ DM of each O-H is 1. 5 D; overall dipole moment of 1.85 D. H 2 O is a polar molecule and excellent solvent. δ+ δ δ+ Polarity of Molecules
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4 Intermolecular Forces: Interactions between Molecules δ+ δ H H O δ δ+ δ+ ¾ Attractions between molecules and their polarities are much weaker than intra molecular bonds that hold molecules together. ¾ However, they control physical and chemical properties such as boiling and melting points, and solubility. ¾ Intermolecular bonds are also called van der Waals forces . Intermolecular bond (weak; shown as dashes) Polar molecules that have permanent dipoles are attracted to each other. • Both attraction and repulsion occur, but
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This note was uploaded on 01/11/2011 for the course BCH 1049 taught by Professor Michaelcwchan during the Spring '06 term at City University of Hong Kong.

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Chap11&13_bc - Intermolecular Forces(Chapters 11 and 13 Whats Ahead 1 States of Matter 2 Polarity of Bonds and Molecules 3 Types of

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