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一、发现问题2016年4月份,苏州市教育局对初三的学生进行了初中化学实验考查,笔者有幸参加了本次监考的工作。本次考查的实验是配制溶质质量分数为6%的氯化钠溶液,实验步骤在考签上均已列出,考生只需填出计算结果和调平天平等几空,然后按照步骤完成实验即可。就是在如此简单的情境下去完成实验,很多学生竟会出现如下问题:1.不知天平上的垫圈是什么;2.用手直接移动游码,读数不知读游码的左边;3.称3克食盐时很多考生加多;4.量取水的体积
First, found the problem In April 2016, Suzhou City Board of Education on the junior high school chemistry experiments, I was fortunate enough to participate in the work of the proctor. The examination of the experiment is the preparation of solute mass fraction of 6% sodium chloride solution, the experimental steps are listed in the test, the candidate just fill out the calculation results and leveling a few empty, and then follow the steps to complete the experiment Can be. It is in such a simple situation to complete the experiment, many students actually appear the following problems: 1. I do not know what the washer on the balance; 2. Directly move the code by hand, the reading is not known to read the left side of the code; 3. Weigh 3 grams Many candidates add salt; 4. Take the volume of water