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以义务教育九年级上册第二单元“我们周围的空气”中课题3“制取氧气”为背景,采取手持技术设计了催化剂、浓度等条件对产生O_2的速率的影响实验。通过实验得到反应前后压力随时间的变化曲线图,进行线性拟合分析,最终得出结论。一、教学过程设计[新课引入]课本中呈现了过氧化氢溶液加热分解产生O_2以及加入MnO_2产生O_2的反应(见图1),加热和加入催化剂的过氧化氢溶液产生的气体能使带火星的木条
Based on the subject 3 “oxygen preparation” in the second unit of compulsory education ninth grade “air around us ”, the effect of catalyst, concentration and other conditions on the rate of O 2 production was experimentally designed. Obtained by experiment the pressure before and after the curve of changes over time, the linear fitting analysis, the final conclusion. First, the teaching process design [introduced into the new class] presented in the textbook hydrogen peroxide solution generated by decomposition of O_2 and added MnO_2 to produce O_2 reaction (see Figure 1), heating and hydrogen peroxide solution added to the catalyst to produce the gas band Mars’s wood