CHEM 153A Chapter Notes - Chapter 2.1-2.5: Osmotic Concentration, Pressure Measurement, Reversible Reaction

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Polar biomolecules dissolves readily in water because they replace water-water interactions with more energetically favorable ones. Oxygen is more electronegative so electrons are more likely to be near oxygen. Each hydrogen has a partial positive charge each oxygen has a partial negative charge. The electrostatic attraction between the oxygen atom of one molecule and a hydrogen of another is called hydrogen bond. These bonds are relatively weak with a bond dissociation energy of 23 kj per mole. The bond is 10% covalent and 90% electrostatic. The thermal energy of an aqueous solution is the same order of magnitude as that required to break hydrogen bonds. When one hydrogen bond brakes another hydrogen bond forms this allows for great internal cohesion of liquid water. Liquid water has about 3. 4 bonds with other molecules compared to ice which has a full 4 bonds with other water molecules.

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