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人教版《化学》必修2,探究了温度对H_2O_2分解速率的影响,课堂上教师往往由前一个实验现象推出结论:在其他条件相同时,温度越高,反应速率越快。不少学生提出疑问:FeCl_3作催化剂,反应前后质量不变,为什么反应前后溶液的颜色变化明显?该现象是否也能推导出以上实验结论?通过设计实验进行探究,分析了溶液颜色变化的原因,证明了溶液颜色变化越快,H_2O_2的分解速率越快。
People’s Education Edition “Chemistry” compulsory 2, to explore the temperature on the rate of H 2 O 2 decomposition, the teacher often in the classroom from the previous experimental conclusion: the other conditions are the same, the higher the temperature, the faster the reaction rate. Many students raised questions: FeCl_3 as a catalyst, the quality of the reaction before and after the same, why the color of the solution before and after the reaction was significant? The phenomenon can also be derived from the above experimental conclusions? Through the design of experiments to explore the reasons for the color change of the solution, It is proved that the faster the color change of the solution, the faster the decomposition rate of H 2 O 2.