CHEM 120 Lecture Notes - Lecture 5: Intermolecular Force, Hydrogen Bond, Chemical Polarity

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Intramolecular attractions = within the same molecule (between elements) Significant attraction to a partially negative portion of another polar molecule. Hydrogen bonding is not the fact that hydrogen is polar covalently bonded to oxygen in the molecule, but that the polarity attracts to another molecule. Intermolecular hydrogen bonding occurs between the partially positive hydrogen of one water molecule. Only one species has to have the hydrogen polar covalently bonded to the very electronegative species e. g. : li2s --> same structure as water but lithium has 1 full shell fo e- shielding outer electron. We can"t have intramolecular hydrogen bonding within small molecules like water, only large and long organic chains have different parts of the same molecule attracting itself: dna, proteins, enzymes etc. Hydrogen bonding holds 2 starnds of dna together and allows the unzipping for replicaton. Intermolecular dipole attraction is one of partially positive element to the partial negative of another polar molecule (both have to be polar molecules)

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