Ch02 Key Concepts & Vocabularyl-Small Molecules and the Chemistry of Life

Ch02 Key Concepts & Vocabularyl-Small Molecules and the Chemistry of Life

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Chapter 2: Small Molecules and the Chemistry of Life OVERVIEW Chapter 2 introduces chemistry as needed to study biology. The chapter describes the nature of atoms and elements, with emphasis on the importance of atomic isotopes. It continues by explaining chemical bonds, molecular structure, and chemical reactions. Special attention is paid to the structure and properties of water and its interactions with polar and nonpolar molecules. The chapter also covers electronegativity, the energetics of chemical reactions, acid/base chemistry and buffers. KEY CONCEPTS 1. The mechanistic view of life states that life is based on the same types of chemicals as the nonliving parts of the universe and obeys the same universal physiochemical laws. 2. Matter is composed of atoms. Each atom consists of a positively charged nucleus of protons and neutrons, surrounded by electrons that bear negative charges and are located in orbital shells. 3. An element is made up of only one kind of atom, distinguished by having a unique number of protons. Of the many elements, just a few (C, H, O, P, N and S)
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Ch02 Key Concepts & Vocabularyl-Small Molecules and the Chemistry of Life

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