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7.4: How to Write Balanced Chemical Equations Steps in Balancing a Chemical Equation Identify the most complex substance. Beginning with that substance, choose an element (s) that appears in only one reactant and one product, if possible. Adjust the coefficients to obtain the same number of atoms of this element (s) on both sides. 7.3: Chemical Equations - Chemistry LibreTexts Writing Chemical Equations. When sulfur dioxide is added to oxygen, sulfur trioxide is produced. Sulfur dioxide and oxygen, SO 2 + O 2, are reactants and sulfur trioxide, SO 3, is the product. 2 SO 2 ( g) + O 2 ( g) ⏟ Reactants → 2 SO 3 ( g) ⏟ Products. In chemical reactions, the reactants are found before the symbol " → " and the ... What is a Chemical Equation? - Definition & Examples Chemical Equations = Reactions Because a chemical equation represents a chemical reaction, it's important to understand what a chemical reaction is. You observe chemical reactions... L...