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- A substanceA material that is either an element or that has a fixed ratio of elements in its chemical formula. for which a physical propertyA characteristic of a material that can be measured without changing the material's chemical composition. (such as color) changes abruptly when the equivalence pointThe point in a titration at which the amount of one reactant being added stoichiometrically matches the amount of another reactant initially present. The end point should match the equivalence point as closely as possible. is reached in a titrationThe gradual addition of one solution to another until the chemical amount of one reactant being added matches stoichiometrically the amount of another reactant in the solution initially present..