BLG 143 Study Guide - Final Guide: Sucrose, Thermal Energy, Acid Strength

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Chapter 2: water and carbon- the chemical basis of life. Simple chemical compounds combined to form more complex carbon-containing substances (ex. formaldehyde h2co, cyanide hcn. Kinetic energy from sunlight and hot water converted to chemical energy in bonds. Biological evolution and natural selection took over. Eventually, descendent of original molecule became surrounded by membrane. * to understand how molecules affect your body, you have to understand how it is put together b/c structure affects function. Isotope: forms of an element with different numbers of neutrons (different masses) ex. 42he 4: mass # (number of p+"s + no"s) 2: atomic # (number of p+"s) Orbitals: speci c region where electrons move around atomic nucleus (hold 2 electrons) Grouped into levels called electron shells (indicate relative distance from nucleus), Stable when valence shell is lled (through chemical bonds) Has only one electron, but shell can hold 2. Not very stable b/c unpaired valence electron.

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