다양한 물질의 상태에 대한 중고등학생들과 과학교사들의 분류 기준에 대한 유형 분석

Abstract

This study is aimed at investigating and comparing what classification criteria secondary school students and science teachers adopt in terms of various matter and their states. The subjects include sixty-five 7th graders, seventy- two 11th graders, and ninety-seven secondary school science teachers. Each participant was surveyed through questionnaires. The results showed that a majority of middle school students classified the state of glass into liquid, while more high school students and science teachers classified it into solid. There also showed the different classification about the state of glass in textbooks among school grades and various classification criteria of states about it among science teachers. They showed a tendency to regard steam, cloud and smoke as gas altogether. According to the questionnaires comparing jelly, cookie dough, pancake dough and salt water, it became clear that macroscopic phenomenon of matter plays an important role in classifying the states of mixture. But the classification of the states of mixture from macroscopic viewpoint not only caused increased confusion but also be hard to define the states of mixture. So, it is necessary to consistently redefine the states of only pure matter from the microscopic viewpoint about the three states of matterand to make various educational efforts.