Student learning of thermochemical concepts in the context of solution calorimetry
Student learning of thermochemical concepts in the context of solution calorimetry
复制标题
学生在溶液量热法背景下学习热化学概念
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
D. Meltzer
中科院分区：
文献类型：
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作者：
T. Greenbowe;D. Meltzer
学生对热和热现象的理解一直是科学教育文献中大量调查的主题。已发表的研究报告了学生在各种高级主题上的概念，但量热法--热化学概念的一个更基本的应用--显然没有受到科学教育研究人员的关注。在这里，我们报告了学生在大学化学入门课上解量热学问题的详细分析。我们包括了207名学生的课堂笔试数据，以及对一个受试者进行的广泛的纵向访谈系列的数据，该受试者本人也是这个大班级的一员。我们的发现揭示了一些学习困难，其中大部分似乎源于未能理解，在水相化学反应中，键能的净增加和减少分别导致能量转移出和进入生成的溶液的总质量。
Student understanding of heat and thermal phenomena has been the subject of considerable investigation in the science education literature. Published studies have reported student conceptions on a variety of advanced topics, but calorimetry - one of the more elementary applications of thermochemical concepts - has apparently received little attention from science education researchers. Here we report a detailed analysis of student performance on solution calorimetry problems in an introductory university chemistry class. We include data both from written classroom exams for 207 students, and from an extensive longitudinal interview series with a single subject who was herself part of that larger class. Our findings reveal a number of learning difficulties, most of which appear to originate from failure to understand that net increases and decreases in bond energies during aqueous chemical reactions result in energy transfers out of and into, respectively, the total mass of the resultant solution.