This equation would be read as "two HCl plus two Na yields two NaCl and H two." But, for equations involving complex chemicals, rather than reading the letter and its subscript, the chemical formulas are read using IUPAC nomenclature. The two are separated by an arrow symbol (→, usually read as "yields") and each individual substance's chemical formula is separated from others by a plus sign.Īs an example, the equation for the reaction of hydrochloric acid with sodium can be denoted: A chemical equation consists of the chemical formulas of the reactants (the starting substances) and the chemical formula of the products (substances formed in the chemical reaction).
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