BIOL 1107 Lecture Notes - Lecture 3: Vaporization, Wet Chemistry, Hydrophile

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Concept 3. 2 four emergent properties of water contribute to earth"s suitability for life. Ice cubes cool a glass of soda by absorbing heat from the soda as the ice melts. Ice is about 10% less dense than water at 4 c. Therefore, ice floats on the cool water below. Ice floating on water has important consequences for life. If ice sank, eventually all ponds, lakes, and even oceans would freeze solid: during the summer, only the upper few centimeters of oceans would thaw. Instead, the surface layer of ice insulates the liquid water below, preventing it from freezing and allowing life to exist under the frozen surface. In our example, water is the solvent and sugar is the solute. In contrast, ammonia is a relatively weak base: the double arrows in the reaction for ammonia indicate that the binding and release of hydrogen ions are reversible reactions, at equilibrium, there is a fixed ratio of nh4.

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