CHM101H1 Chapter Notes -Chemical Polarity, Protein Subunit, Phosphodiester Bond
23 Mar 2014
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An atom often behaves as if it has a fixed radius. Space-filling models give us a more accurate representation of molecular structure. A solid envelope represents the radium of the electron cloud at which strong repulsive forces prevent a closer approach of any second, non-bonded atom the so-called van der. At slightly greater distances, any two atoms will experience a weak attractive force, known as a van der waals attraction. There is a distance at which repulsive and attractive forces precisely balance to produce an energy min in each atom"s interaction with an atom of a second, non-bonded element. Water is the most abundant substance in cells. Water accounts for 70% of a cell"s weight. Explains why water is a liquid at room temp, with a high bp and high surface tension. Molecules that contain polar bonds can form h bonds with water dissolve readily in water.
