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It concludeswith a brief survey of the various topics in organic chemistry and a description ofthe way that we present them in this text. 1.1 Organic Molecules All organic molecules contain carbon (C) , virtually all of them contain hydrogen(H) , and most contain oxygen (O) and/or nitrogen (N) atoms.
Several organic compounds (compounds containing carbon) compose the organic fraction of nitrogen in soil. Soil organic matter exists as decomposing plant and animal residues, relatively stable products of decomposition-resistant compounds and humus.