BIOLOGY 172 Lecture Notes - Lecture 2: Van Der Waals Force, Heat Capacity, Hydrophile

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Polar molecules and ions dissolve readily in water (salt) Nonpolar molecules do not easily dissolve in water; interact with each other (not with hydrophilic. Insulation by floating ice (reduced density in solid) Hydrogen bonds between h2o and other polar molecules/ions help the substances stay in solution water) by van der waals interactions. Chemical properties of water that support life ph scale= -log [h+] Carbon is tetravalent (four unpaired electrons in outermost shell) Simple hydrocarbons - contain only c and h (example: methane, ethane, octane, Six functional groups commonly attached to carbon atoms: Composed of amino acids polymers polysaccharides nucleic acids. Each has a carboxyl group and an amino group. Amino acids differ in charge, polarity, and size, and r group. Polar r groups- are hydrophilic; forms hydrogen bonds; readily dissolve in water. Nonpolar r groups- are hydrophobic; do not form hydrogen bonds; do not dissolve in. R groups differ in their size, shape, reactivity, and interactions with water water.

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