BMB 207 Lecture Notes - Lecture 16: Surface Tension, Boiling Point, Heat Capacity
8 Oct 2016
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Document Summary
Ice floats on surface of a lake. Ice is formed by water molecules in 4 hydrogen bonds with 4 surrounding water molecules. Solutions of electrolytes in water are conductive. Solutions of electrolytes are dissolvable in water. When a molecular compound dissolves the molecules move away from one another but generally do not break apart into ions. Nonelectrolytes are substances that do not conduct electricity when they dissolve in water. The upper limit to the mass that can be dissolved in a liter of water is the solubility of the substance. An unsaturated solution uses less than this amount of the solute and could dissolve more solute. A saturated solution has met the solubility limit. Temperature and pressure (in relation of solubility): The solubility of a solid in water increase as temperature is raised. Gases dissolve better in cold water than warm water. The solubility of solids and liquids is not dependent on pressure.
