Students' reasoning about basic chemical thermodynamics and chemical bonding: what changes occur during a context-based post-16 chemistry course?
Students' reasoning about basic chemical thermodynamics and chemical bonding: what changes occur during a context-based post-16 chemistry course?
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DOI：
10.1080/09500690050166742
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发表时间：
2000-11-01
影响因子：
2.3
通讯作者：
Millar, R
中科院分区：
文献类型：
--
作者：
Barker, V;Millar, R
一项对250名学生进行的纵向研究探索了一系列化学思想，包括键形成的非线性以及共价键、离子键和分子间键的发展。学生们在三种情况下回答了同样的诊断问题：在开始时，在为期20个月的课程的8个月和16个月后。一开始，许多学生表现出对这些化学思想的误解，但总的来说，随着课程的进展，他们的理解有所提高。到研究结束时，大约一半的人知道键的形成是放热的。最初，很少有人准确地描述共价键或理解氢键。大多数人在最后的调查中给出了符合化学家可能使用的想法和语言的回答。学生们将这些变化归因于使用了基于上下文的材料，包括一种点滴式的方法，这种方法使他们的理解随着时间的推移而发展。然而，尽管有明确的教学，化学键的某些方面，包括离子键和氢键以外的分子间键，对学生来说仍然是个问题。研究结果对16岁以后的化学教学具有一定的启示意义，表明在某些领域需要对教学策略进行重新审视。
A longitudinal study of 250 students following the Salters Advanced Chemistry (SAC) course probed a range of chemical ideas including the exothermicity of bond formation and the development of thinking about covalent, ionic and intermolecular bonds. Students responded to the same diagnostic questions on three occasions: at the start, after eight months and sixteen months of a twenty-month course. At the start, many students demonstrated misunderstandings about these chemical ideas, but in general their understanding improved as the course progressed. By the end of the study, about half knew that bond making is exothermic. Initially, few described covalent bonds accurately or understood hydrogen bonding. A majority gave responses at the final survey which were in line with ideas and language a chemist may use. Students attributed changes to the use of context-based materials including a drip-feed approach which allowed their understanding to develop over time. However, some aspects of chemical bonding, including ionic bonding and intermolecular bonds other than hydrogen bonds remained problematic for students despite explicit teaching. The findings have implications for post-16 chemistry teaching, suggesting that a review of teaching strategies is needed in some areas.