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实验是初中化学教学的重要手段,对学生学习初中化学起着促进作用。激发学生的学习兴趣、培养学生的创新精神以及实践能力是初中化学的教学目标之一。本文主要介绍蜡烛及其燃烧的探究、倾倒二氧化碳、铝在氧气中燃烧这三个初中化学常见的实验中存在的问题,并采取相应的改进策略。一、蜡烛及其燃烧实验的改进策略在这一实验中,存在的不足有:(1)手持烧杯放在火焰上方,因烧杯壁较薄,几秒钟之后,能够明显感到发
Experiment is an important means of junior high school chemistry teaching, which plays a promoting role in junior high school chemistry. Inspiring students ’interest in learning, cultivating students’ innovative spirit and practical ability are one of the teaching goals of junior high school chemistry. This article mainly introduces the problems existing in the common experiments of three junior high schools, such as the exploration of candles and their combustion, the dumping of carbon dioxide, and the combustion of aluminum in oxygen. Corresponding improvements are also made. First, the candle and its combustion experiments to improve the strategy In this experiment, the deficiencies are: (1) Hand-held beaker placed on top of the flame, due to the beaker wall is thin, after a few seconds, you can obviously feel the hair