基于学习进阶的气体制备及性质的教学研究

以课标中要求掌握气体制备与性质的(1)氧气、二氧化碳,(2)氯气、氨气,以及不要求掌握制备的中学阶段重要气体(3)乙烯、二氧化硫作为三段进阶的考查内容,对北京市示范性高中的156名高一学生进行测查,结果发现学生相关知识储备的深入性与系统性不佳,尤其是气体净化与收集等环节;学生在外部信息的有效提取上存在困难,化学阅读能力尚待提高;三段进阶层次性明显,由易到难,低层级作为高层级的重要基础。基于此,本研究提出了相应的教学策略。

Teaching Research on Gas Preparation and Properties Based on Learning Progression

This study uses(1)O2/CO2(2)Cl2/NH3 that are required to master the gas preparation and properties and important intermediate gases(3)C2H4/SO2 that are not required to master the gas preparation as the three levels of advanced inspection to test 156 high school students in Beijing’s model high school. The results shows that the depth and the systematism of the students’ knowledge reserves are not good, especially in the process of gas purification and collection;students have difficulty in extracting external information effectively and their ability of chemical reading needs to be improved;the three levels of advanced level is obvious, from easy to difficult,the lower level as the important foundation of the higher level. Based on this, this research puts forward corresponding teaching strategies.