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化学实验是化学学科的基础。通过化学实验能够激发学生的学习兴趣、培养学生的科学精神和科学方法。为了提高实验教学的质量,必须认真做好演示实验,通过演示实验,可以很好地集中学生注意力,并在由观察、推理至结论产生的过程中培养逻辑思维能力。此外,教师正确的演示,还能对学生起示范作用。做好演示实验,应注意以下几个方面。 一、演示实验前要做的工作: 1.直观性:既要求现象鲜明,又能说明问题。要选择在反应中有颜色变化、沉淀生成、发光发热燃烧爆炸、气体产生,物质
Chemical experiments are the foundation of chemistry. Through chemical experiments, students’ interest in learning can be stimulated, and students’ scientific spirit and scientific methods can be cultivated. In order to improve the quality of experimental teaching, demonstration experiments must be done well. Through demonstration experiments, students’ attention can be well focused, and logical thinking ability can be cultivated in the process of observation, reasoning, and conclusion. In addition, the correct demonstration of teachers can also play a role in demonstrating to students. To do a good demonstration experiment, you should pay attention to the following aspects. First, to demonstrate the work to be done before the experiment: 1. Intuitive: not only requires a clear-cut phenomenon, but also can explain the problem. It is necessary to select color change, precipitation generation, light-emitting heating, combustion explosion, and gas generation in the reaction.