BZ 105 Lecture Notes - Lecture 2: Capillary Action, Disaccharide, Lactase

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Tuesday, january 24, 2017 week 2 day 1. Bz 104 chemical bonds and the molecules of life. Ionic bonds: one atom donates an electron to another, two ions attract each other, found in salts, acids and bases. Covalent bonds: atoms share electrons, stronger than ionic or hydrogen bonds, don"t dissolve in water. Polar covalent bonds: water; o and h attract electrons unevenly, o gets sight (-) charge, both h"s get slight (+) charges, between ionic and covalent. Hydrogen bonds: attraction between differently charged poles (different molecules, weak bonds, fig. Cohesion and adhesion: cohesion- some molecules of the same type are attracted to each other, adhesion- some molecules are attracted to other types of molecules. Tuesday, january 24, 2017: water molecules are cohesive because they form hydrogen bonds with each other, water molecules are also adhesive, capillary action. 4 main types of organic compounds: carbohydrates. 2. lipids: proteins, nucleic acids (will talk about these in dna lecture, organic= contains carbon.

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