BCH 261 Lecture Notes - Lecture 1: Chemical Polarity, Intermolecular Force, Semipermeable Membrane
6 May 2016
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Document Summary
By mass water makes up 60-70% of a cell. Allows proteins to fold into their correct conformation (polar molecules on the outside, non-polar on the inside) They have an uneven sharing of electrons between both hydrogens and the oxygen molecules, whereby the oxygen (which has a strong affinity for water) attracts the electrons more closely than the hydrogen molecules. Because the hydrogens are both partially positive they are attracted to other oxygen molecules, which are partially negative. *weaker than covalent bonds (>0. 1x the association chemical energy) Not all hydrogen bonds are equal strength, configuration of the molecule (and the atoms involved in the molecule) play a role in the strength of the intermolecular bond. Hydrogen bonding is about 23 kj/mol usually occur in large amounts which make it strong. Water is tetrahedral molecule (meaning it has 4 possible bonding domains, or sides) As a result of this it can hydrogen bond to 4 other molecules (as a crystalized solid)
