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一、实验改进的目的铁与盐酸、稀硫酸的反应是人教版九年级化学下册第八单元课题2中的探究实验。按照教材所示的操作进行操作,存在以下不足:铁片与盐酸或稀硫酸的反应速率过于缓慢,课堂演示实验或者学生分组实验中无法观察到溶液由无色变为浅绿色,易让学生误认为含Fe¨的溶液为无色。为解决这些问题,笔者对实验步骤与用品进行改进,取得了较好的教学效果与明显的实验现象。二、实验用品与操作步骤1.取一支试管,装适量盐酸或稀硫酸溶液,加热,以
First, the purpose of experimental improvement Iron and hydrochloric acid, the reaction of dilute sulfuric acid is the People’s Education Edition ninth grade chemistry eighth unit research topic 2 in the experiment. In accordance with the teaching of the operation shown in the operation, there are the following shortcomings: iron and hydrochloric acid or dilute sulfuric acid reaction rate is too slow, classroom demonstration experiment or student group experiments can not be observed in the solution from colorless to light green, easy to make mistakes The solution containing Fe? Was considered colorless. To solve these problems, the author improved the experimental procedures and supplies, and achieved good teaching results and obvious experimental phenomena. Second, the experimental supplies and procedures 1. Take a test tube, install the right amount of hydrochloric acid or dilute sulfuric acid solution, heated to