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人的认识来源于实践,在不断的实践中丰富和加深了认识,再用它指导实践。在化学教学中,应该充分运用这个认识规律,它可以使学生容易懂,学得会,记得牢。以下谈几点个人的做法和认识。一、要做好演示实验。实验本身就是一种实践。通过演示实验,可以使学生直接看到化学现象,有利于说明问题或树立概念,这是讲好化学课的重要手段。例如,在初中化学里讲加热氯酸钾(KClO_3)制取氧气(O_2)时,使用二氧化锰(MnO_2)做催化剂。关于加热KClO_3可以分
Human knowledge comes from practice. It enriches and deepens understanding in continuous practice and uses it to guide practice. In chemistry teaching, this cognitive law should be fully utilized. It can make students easy to understand, learn and remember. Here are some personal tips and understandings. First, we must do a demonstration experiment. The experiment itself is a practice. Through demonstration experiments, students can see chemical phenomena directly, help explain problems or establish concepts. This is an important means of teaching chemistry classes. For example, in junior chemistry, when potassium chloride (KClO 3 ) is used to make oxygen (O 2 ), manganese dioxide (MnO 2 ) is used as a catalyst. About heating KClO_3 can be divided