![]() Writing balanced equations for some redox reactions that occur in aqueous solutions is simplified by using a systematic approach called the half-reaction method. Redox reactions involve a change in oxidation number for one or more reactant elements. Acid-base reactions involve the transfer of hydrogen ions between reactants. Precipitation reactions involve the formation of one or more insoluble products. A large number of important reactions are included in three categories: precipitation, acid-base, and oxidation-reduction (redox). 4.2 Classifying Chemical ReactionsĬhemical reactions are classified according to similar patterns of behavior. Chemical reactions in aqueous solution that involve ionic reactants or products may be represented more realistically by complete ionic equations and, more succinctly, by net ionic equations. Balanced equations are those whose coefficients result in equal numbers of atoms for each element in the reactants and products. Formulas for the substances undergoing the change (reactants) and substances generated by the change (products) are separated by an arrow and preceded by integer coefficients indicating their relative numbers. 4.1 Writing and Balancing Chemical EquationsĬhemical equations are symbolic representations of chemical and physical changes. ![]()
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