BIOL 1107 Chapter Notes - Chapter 2: Hydroxy Group, Homeostasis, Organic Compound

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23 Jan 2017
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Chapter 2 notes for lecture 1/20 and 1/22. Water and carbon: the chemical basis of life (pg 18-38) Atoms, ions, and molecules: the building blocks of chemical evolution. Extremely small particles called electrons orbit an atomic nucleus made up of larger particles called protons and neutrons. Covalent bonds form when the attractive forces overcome the repulsive forces. Some atoms hold the electrons in covalent bonds much more tightly than do other atoms. The electronegativities of the four most abundant elements in organisms are o > Because carbon and hydrogen have approximately equal electronegativity, the electrons in a c-h bond are shared equally or symmetrically. In contrast, asymmetric sharing of electrons results in a polar covalent bond. Because electrons are shared unequally in each o-h bond, they spend more time near the oxygen atom, giving it a partial negative charge, and less time near the hydrogen atoms, giving them a partial positive charge.

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