This equation indicates that oxygen and CH 4 react to form H 2O and CO 2. Using IUPAC nomenclature, this equation would be read as "methane plus oxygen yields carbon dioxide and water." ![]() This equation would be read as "CH four plus O two yields CO two and H two O." 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 formula for the burning of methane can be denoted: CH 4 + 2 O 2 CO 2 + 2 H 2O ![]() 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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