［知识要点］ 一、化学反应速率 意义：表示化学反应进行快慢的量．常依据反应物消失或生成物产生的快慢比较反应速率的大小． １．表示方法：通常用单位时间内反应物浓度的减小或生成物浓度的增加表示． 计算式： 注意：（１）同一反应的反应速率用不同物质浓度变化表示时，数 [Knowledge points] First, the rate of chemical reactions Meaning: Express the amount of chemical reactions. Frequently, the reaction rate is compared based on the disappearance of the reactants or the production of the reactants. 1. Representation method: usually expressed as a decrease in reactant concentration per unit time or as an increase in product concentration. Calculation formula: Note: (1) when the reaction rate of the same reaction is expressed by the change of the concentration of different substances,