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RelativeResourceManager(1) - Chemistry Review for...

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1 of 17 Chemistry Review for Introductory Soils A fundamental knowledge of chemical principles is important to understanding soil genesis and management and the fate of plant nutrients in the environment. The following is a review of some of the basics used in the course. Definitions Element: a pure substance that cannot be broken down into two or more simpler substances by the methods ordinarily available in the laboratory. Atom: the smallest unit into which an element can be divided and still retain its identity as an element. Isotope: one of two or more atoms that have the same number of protons but different number of neutrons (i.e. 15 N, 14 N). Compound: a substance that can be broken down into two or more elements. The composition of a compound is always the same, formation of compounds absorbs or releases energy, the elements forming the compound lose their individual identity, and compounds are homogeneous (i.e. Table salt, NaCl).
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