化学教师知道,学化学的时候,学生独立工作有多麽重大的意义。甚至在那些没有化学实验室的学校里,很多教师也坚持地寻找进行化学实验的方法:组织学生的家庭实验、班上部份学生的实验、学期末的实习等等。在学校里没有化学实验室,我也坚持地找到了在化学上学生独立工们的实施办法:并且深信,在课堂上的实验作业是在这种困难的条件下学生进行独立工作的适当的形式之一。实验作业的组织实验作业几乎是每一课都有,每次只给一个题目。任务由两个学生来执行,因为这样经济时间,并且使每一个学生依次完成实验作业的机会更多些。只有在这种情况下才不按照次序:如果实验或多或少有些困难,或者和解计算题有关。在这种情况下,就叫全班学生在纸上理论地来作这个练习;而实验任务的执行则由最先作好练习的两个学生来担任。因为学生们最乐意作实验,所以这种不按次序的来执行任务,对他们是一种特殊的奖励。实验作业在上课开始的时候,在检查家庭作业的时间里进行。这样,分配多少时间检 Chemistry teachers know how important it is for students to work independently when they learn chemistry. Even in schools that do not have a chemistry lab, many teachers insist on ways of conducting a chemistry experiment: organizing home experiments for students, experimenting with some students in the class, and internship at the end of the semester. There is no chemical laboratory at school, and I insisted on finding ways to implement chemical independent students: and convinced that the experimental work in the classroom is the proper form for students to work independently under such difficult conditions one. Experimental experimental organization of the homework Almost every lesson has to give only one topic at a time. The task is performed by two students because of the economic time and more chances for each student to complete an experimental assignment in turn. Only in this case do not follow the order: if the experiment is more or less difficult, or to solve the calculation problem. In this case, the whole class is called theoretically for this exercise on paper; while the experimental task is performed by the first two students who practice well. Because students are most willing to experiment, this kind of out of order to perform the task, for them is a special reward. The experiment was done at the beginning of the class and at homework exams. In this way, how much time is assigned