化学反应中有很多与物质性质强弱有关的反应,在发生化学反应时,物质性质强的优先发生反应,这就是化学反应中的“优先原理”.学生在解题过程中,因为弄不清楚谁先反应谁后反应,导致在考试中出错较多,尤其在氧化还原反应上失分严重.本文重点从氧化还原反应入手,归纳“优先原理”的几点应用. There are many reactions in the chemical reaction that are related to the strength of the substance, and when the chemical reaction occurs, the substances with the stronger physical properties will react preferentially. This is the “principle of priority” in the chemical reaction. It is unclear who responds first and then leads to more mistakes in examinations, especially in the redox reaction. This article focuses on the redox reactions and summarizes some applications of “priority principle”.