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一、发现问题化学是一门以实验为基础的科学,化学实验能激发学生强烈的求知欲。在学习实验室制取氧气时,同学们发现老师把30%的过氧化氢溶液稀释到5%后再加入到二氧化锰中制取氧气。他们问老师为什么不用30%的过氧化氢溶液直接制取氧气,老师说30%的过氧化氢溶液太浓,反应太快,不易收集氧气。同学们听完后又提出了新的问题:过氧化氢分解速率与什么因素有关呢?
First, the discovery of the problem Chemistry is an experiment-based science, chemical experiments can stimulate students’ strong curiosity. When preparing oxygen in the study lab, the students found that the teacher diluted 30% hydrogen peroxide solution into 5% and then added manganese dioxide to make oxygen. They asked the teacher why they did not use 30% hydrogen peroxide solution to make oxygen directly. The teacher said that 30% hydrogen peroxide solution is too strong and the reaction is too fast to collect oxygen. After listening to the students put forward a new question: hydrogen peroxide decomposition rate and what factors related to it?