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KMID : 1059520120560010144
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Journal of the Korean Chemical Society
2012 Volume.56 No. 1 p.144 ~ p.158
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The Teachers' and Students' Perceptions on Lectures and Experiments of Law of Definite Proportion in Middle School Science Classes
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Han Gam-Bong
Min Hee-Jung
Paik Seoung-Hey
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Abstract
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In this study, science teachers' and students' perceptions were searched on lectures and experiment of law of definite proportion in middle school science classes. For this study, the three teachers' lessons were observed and recorded, following interviews related to teachers' perceptions on the lessons and experiments. Also, We analyzed students' science scores, cognitive levels, science attitude, experimental reports, etc. According to the results, the three teachers had different focuses in the lectures. Chemistry teachers accentuated calculation of proportions and application rather than basic conceptions. But the students could not understand basic conceptions properly. The teachers spend long time to explain experimental procedures by assuming a low performance level of students in experimental classes. And the teachers had negative perceptions about error of results. The students could not understand the experiment results well, tried to manipulate data artificially, and had negative perceptions about error of results like the teachers. We suggested that these problems might be solved by changing teachers' perceptions on school science lectures and experiments.
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KEYWORD
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Middle school, Law of definite proportion, Perception on lecture and experiment
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