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化学是一门以实验为基础的自然科学,这也正是化学的魅力所在,是化学教学不可或缺的重要手段。随着教学目标的改变、教学内容的更新、研究手段的现代化,创造性地使用教材,改进化学实验,有助于激发学生的学习兴趣,创设生动活泼的教学情境。一、实验的环保化。在探究燃烧的条件时,课本中的实验所需时间长,白磷燃烧产生的白烟污染环境。为了克服以上缺点,可以改进为:在500ml的烧杯中注入200ml热水
Chemistry is an experiment-based natural science, which is exactly the charm of chemistry, an indispensable means of chemistry teaching. With the change of teaching objectives, the updating of teaching contents, the modernization of research methods, the creative use of teaching materials and the improvement of chemistry experiments, it helps to stimulate students’ interest in learning and create vivid teaching situations. First, the experiment of environmental protection. In exploring the conditions of combustion, the time required for the experiments in the textbooks and white smoke from white phosphorus combustion pollute the environment. In order to overcome the above disadvantages, it can be improved to inject 200 ml of hot water in a 500 ml beaker