31 - Topics for the day Administrative stuff Intermolecular...

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Topics for the day Administrative stuff Intermolecular forces (continued) Dispersion forces Hydrogen bonds Relative intermolecular force strength Administrative stuff Homework Don’t forget your Quest HW4 is due Friday 10 am (4/9) ALEKS objective 5 due next Monday (10 am, 4/12) Practice exam coming soon! 1 2 3
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Where were we? Intramolecular forces hold atoms together to form molecules (ionic/ covalent bonding). Intermolecular forces hold atoms or molecules together to form condensed phases (dipole-dipole, dispersion and hydrogen bonding). Intermolecular forces are much weaker than intramolecular forces, and needing much less energy to break them. Ion-ion intermolecular forces are the same as ionic bonding and are strong. Ion-dipole intermolecular forces happen during solvation. Dipole-dipole intermolecular forces occur between polar molecules. Dispersion intermolecular forces occur between all molecules and are the only form of intermolecular force for nonpolar molecules. They are caused by the creation of instantaneous induced dipoles in the electron clouds of the atoms or molecules that attract each other. Polarizability measures how easily a molecule can be induced to make a dipole, and increases with size, number of electrons, delocalization, and larger molecular surface area. If intermolecular forces are strong, then breaking these forces (melting or boiling) will take more energy (increased melting/boiling point). A polar molecule can interact with a nonpolar molecule (e.g., oxygen dissolving in water), via a dipole-induced dipole interaction. In this case the polar molecule induces a dipole in the nonpolar molecule. This
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