Chemical Change - the formation of a new substance with different properties; cannot be undone by physical means, Chemical Formula - a representation of a compound in which the elements are represented by their symbols and subscripts represent the number of atoms of each element, Chemical Symbol - representation of the name of an element; written as a capital letter or a capital letter followed by a lowercase letter(s), Compound - a pure substance made by chemically combining two or more elements; represented by a chemical formula, Element - a pure substance that cannot be broken down chemically into simpler substances, Physical Change - change which alters the physical properties of a substance without changing its identity, Precipitate - the solid that is formed as a result of a chemical change, Pure Substance - a substance that is not mixed with any other substance, Subscript - the number written to the right and slightly below an element in a chemical formula; represents the number of atoms of an element present in a chemical formula,

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