An Analysis and Improvement of the Experiments for Comparing Properties of a Mixture with a Compound of Iron and Sulfur in the Middle School Science Textbooks

摘要

The purposes of this study were to analyze problems in the experiments for comparing properties of a mixture with a compound of iron and sulfur and then to suggest the improved experiments. For this study, the experimental methods in 9th science textbooks described were analyzed and middle school science teachers were asked to conduct the experiment according to the process of the textbook and to point problems of the experiment. Two alternative experiments, which improves the problems of the toxic and provocative experiment and of distinction between a mixture and a compound by magnetic properties, were proposed. The two experiments were applied to the 10 science teachers and 60 students from a ?°S?± middle school. They responded that the experiments were suitable for comparing properties of a mixture and a compound and helpful to understand the concept.