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Change of Science Teachers' Perceptions About the Atmosphere Composition of Molecules with Different Masses

서로 다른 질량을 가진 분자들로 이루어진 대기의 조성에 대한 과학교사들의 인식 변화

  • Yoo, Seunggyun (Department of Chemistry Education, Korea National University of Education) ;
  • Paik, Seoung-Hey (Department of Chemistry Education, Korea National University of Education)
  • 유승균 (한국교원대학교 화학교육과) ;
  • 백성혜 (한국교원대학교 화학교육과)
  • Received : 2018.02.22
  • Accepted : 2018.06.01
  • Published : 2018.08.20

Abstract

In this study, we surveyed pre- and post-perceptions of fourteen science teachers related to the atmosphere composition of molecules with different masses by the developed test. As a result of the test, the teachers were classified into two types of thoughts; One of them is considered the atmosphere to be a homogeneous solution, and the other is a thought that the composition ratio of the atmosphere was not homogeneous considering the different weights of particles. The two types were reclassified into three categories; one of them is considering large gravity effect, another is considering small gravity effect, and the other is considering medium scale gravity effect. Total six types of thoughts were found from the pre-test. After introducing crosscutting concepts which are related to the composition of atmosphere. The teachers discussed the phenomena with the molecular motion by weights of atoms and temperature, the homogeneity of the solution of air in chemistry domain. They also discussed with the relationship between mass and gravity and distance in physics domain. And the discussion included distribution of the atmosphere, convection phenomena, etc. After the discussion, the teachers changed their pre-conceptions to post-concoctions considering combined perspectives of gravity, mass, temperature, altitude etc. Through these changes, we are able to confirm the importance of crosscutting concepts covered in various disciplines. In the integrated science, we should help teachers to provide students with these types of thinking in order to form a coherent world-view and to carry out inquiry thinking as an intellectual tool.

Keywords

Crosscutting concept;Composition of atmosphere;Science teacher

Acknowledgement

Supported by : Korean Chemical Society

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