Because matter cannot be generated or destroyed through chemical reactions, all chemical equations must be balanced. When some substances convert chemically into other others, a chemical reaction takes place.
Chemical equations serve to represent the transformation of reactants into products. For instance, the combination of iron (Fe) and sulfur (S) results in iron sulfide (FeS). S(s) + Fe(s) = FeS (s) The + sign denotes an iron-sulfur reaction.
A chemical equation is a symbol- and formula-based symbolic representation of a chemical reaction, with the reactant entities given on the left side and the product entities given on the right. Examples are NaOH+HClNaCl+H2O.
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