BSC 2010 Chapter Notes - Chapter 3: Evaporative Cooler, Heat Capacity, Surface Tension
27 Aug 2016
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Each h2o molecule can form 4 hydrogen bonds. Cohesion and adhesion: caused by hydrogen bonding, cohesion: water to water, adhesion: water to another polar substance other than water, capillary action: water traveling up the roots of plants by cohesion and adhesion. Work together in transcription; plants have hydrophilic walls that enable adhesion. Properties of water: surface tension: result of cohesion, temperature moderation: water can moderate temperature because it has a high specific heat capacity. Evaporative cooling: water has a high specific heat due to hydrogen bonds, responsible for cooling, heat is released as a liquid and vaporized as a gas. Highest energy molecules are evaporated first: liquid water is more dense that solid water. Increased temp- increase in k. e- interferes with hydrogen bonds- h2o molecules are more spread out: coldest water = densest water. H2o is the most dense at 4 degrees celsius. Dissolving: water is polar, so it dissolves polar substances.
