化学起源于实验又依赖于实验,是一门以实验为基础的自然科学。化学实验能使学生获得大量的、丰富的、直观的感受和知觉,能在学生头脑中留下深刻的记忆,从而使学生在此基础上结合已有知识进行分析、判断、想象、概括、抽象等。实验是化学知识最直观的来源。现行人教版高中教材在实验方面的变动很大,保留了原有的经典实验,删减了一些有危害性的实验,增加了大量趣味性和可操作的探究实验,但不能否认还有为数不少的演示实验有着这样或那样的缺点有待改进与完善。因此,不少演示实验的改进方法应运而生。这些改进方法的视角独特,可操作性强,效果好。下面,笔 Chemistry originated from experiments and depended on experiments. It is a natural science based on experiments. Chemical experiments can enable students to obtain a large number of rich and intuitive feelings and perceptions, which can leave deep memory in the students’ minds, thus enabling students to combine existing knowledge for analysis, judgment, imagination, generalization, and abstraction. Wait. Experiments are the most intuitive source of chemical knowledge. The teaching materials of the current People’s Education Press have a lot of changes in experiments. They have retained the original classical experiments, cut down some of the harmful experiments, added a lot of interesting and operational exploration experiments, but can not deny that there are a number of Many demonstration experiments have one or more disadvantages that need improvement and improvement. Therefore, a lot of improved methods of demonstration experiment came into being. These improved methods have unique perspectives, strong operability, and good results. Below, pen