期刊
EDUCATION SCIENCES
卷 13, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/educsci13030316
关键词
didactic sequence; reflection; refraction; interference; diffraction; emission; absorption; high school; spectroscope; spectroscopy; topic-specific pedagogical content knowledge
This study aimed to design, optimize, and implement a didactic sequence on light phenomena, including the basic principles of reflection, refraction, interference, diffraction, and light dispersion, as well as ultraviolet-visible spectroscopy and spectroscopic instruments. By investigating the difficult concepts of light phenomena and using inquiry-based learning, interactive STEM laboratory activities, and a historical epistemological teaching method, this study aimed to help high-school students better understand and apply these concepts in analytical chemistry applications.
Spectroscopy is the basis of many applications in chemistry; however, the basic principles of light, light-matter interaction, and the operation of spectrophotometers are rarely present in chemistry curricula at the high-school level, or they are only briefly introduced to students before focusing on analytical chemistry applications. In this work, we report the results of a study conducted over several years, aimed to design, optimise, and put into practice a didactic sequence on light phenomena such as reflection, refraction, interference, diffraction, and light dispersion, as well as the basic principles of ultraviolet-visible spectroscopy and spectroscopic instruments. Difficult concepts of light phenomena and related topics were deeply investigated, focusing on the best ways to teach them to high-school students in the framework of the content-specific components identified in the topic-specific pedagogical content knowledge theoretical model. Inquiry-based learning and interactive STEM laboratory activities were combined with a historical epistemological teaching method. Short introductory videos were also recorded to help students during the remote lessons in the COVID-19 pandemic period. In this paper, we report and discuss the research strategy used in order to design and implement the sequence of educational activities, leading to a final optimised didactic sequence that was tested in a pilot study. The main results were obtained from the experimentation with several classes in two high-school technical institutes with a chemistry and material sciences curriculum, along with a group of undergraduate students during the first part of an introductory course on molecular spectroscopy.
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