153A_LEC2

153A_LEC2 - Weak Forces and Aqueous Solutions Week 1 Jan....

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1 Weak Forces and Aqueous Solutions Week 1 Jan. 8, 2007
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2 Overview • Weak forces • Aqueous solutions
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3 Review of last lecture Living Systems Have distinctive properties Organized, structured, complex Biomolecular hierarchy Noncovalent interactions: Hydrogen bonds, ionic interactions, van der Waals interactions, hydrophobic interactions Individually much weaker than covalent bonds Crucial to structure & function of biomolecules
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4 What noncovalent intermolecular and intramolecular interactions are involved in biochemistry? Noncovalent interactions (a.k.a. weak chemical forces or electrostatic forces) – van der Waals – Hydrogen bonds – Ionic interactions – Hydrophobic interactions • Individually weak, but collectively strong
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5 Intramolecular force and intermolecular force • Atoms within a molecule are attracted to one another by the sharing of electrons, this is called an intramolecular force . • The electrostatic forces that held molecules together are called intermolecular forces , and are in general much weaker than the intramolecular forces .
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6 van der Waals’ forces • Dipole-Dipole Forces • exists between neutral polar molecules • attract one another when the partial positive charge on one molecule is near the partial negative charge on the other molecule • Dipole-dipole forces increase with an increase in the polarity of the molecule
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7 van der Waals in Action • Gecko feet are adhesive due to van der Waals interactions
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153A_LEC2 - Weak Forces and Aqueous Solutions Week 1 Jan....

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