BIO-100 FA5 Lecture Notes - Lecture 4: Evaporative Cooler, Evaporation, Hydrophile
20 Mar 2017
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Ex: estimating the age of fossils: # of electrons determines the chemical behavior of atoms, electrons (e-) lie at varying distances around the nucles because energy levels of e- vary. The closer to the nucleus, the lower the energy. The farther from the nucleus, the higher the energy: electron configuration, filling in the order of low to high energy level. Innermost shell (1st shell) to the outermost shell: each shell can accommodate only a certain # of e- in each shell (2-8-8 rule, first 10 electrons: When h gets close to a different partially charged atom (o or n), there will be a weak electrical attraction; hydrogen bond: individually weak, collectively quite strong, very important in living systems. Ex: when nacl is dissolved in water, each ion is surrounded by a sphere of water molecules called a hydration shell: any substance that has an affinity for water is hydrophilic ( water-loving )
