BIOL 205 Lecture Notes - Lecture 17: Ocean Acidification, Bicarbonate, Sodium Chloride
16 Nov 2016
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Biol 205 the solvent of life lecture 16. Water: a molecule of two hydrogens bonded to one oxygen. The oxygen is partially negatively charged as it has a stronger electronegativity and steals an electron from hydrogen. The hydrogens are partially positively charged because they lose their electrons to oxygen. When astrobiologists search for signs of extraterrestrial life on other planets, they look for evidence of water. Water supports life because of its properties: polarity, hydrogen bonding due to polarity, cohesion: the tendency of molecules of the same kind to stick together. Wate(cid:396)"s (cid:272)ohesio(cid:374) is (cid:373)u(cid:272)h st(cid:396)o(cid:374)ge(cid:396) tha(cid:374) othe(cid:396) li(cid:395)uids. Plants depend on cohesion to help transport water and nutrients from the roots to the leaves. Water has a much higher resistance to temperature change than other liquids. Heat must be absorbed to break the hydrogen bond. Heat is released when the hydrogen bond is formed.
