A representation of a chemical reaction, usually written as a linear array in which the symbols and quantities of the reactants are separated from those of the products by an equal sign, an arrow, or a set of opposing arrows.

• 化学方程式代表一个化学反应，通常写作一行符号，表示反应物及其数量的符号被箭头或两个反方向箭头同其生成物的表达式分开