《化学课程标准》要求学生在科学探究能力方面能根据所要探究的具体问题设计简单的化学实验方案,具有控制实验条件的意识。在通常的实验探究过程中,往往会有多种因素影响某一实验结果,我们要探究其中一种因素时,只有使其他因 The “Chemistry Curriculum Standards” require students to design simple chemical experiment schemes according to the specific problems to be explored in the ability of scientific inquiry, and have the awareness of controlling the experimental conditions. In the usual experimental exploration process, there are often many factors that affect the result of an experiment. When we want to explore one of the factors,