• Title/Summary/Keyword: Chemistry

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Relationship between the High School Chemistry I, II, and the General Chemistry, and College Students' Cognition about the Subject (대학교 일반화학과 고등학교 화학 I, 화학 II 교과의 연계성 및 일반화학에 대한 대학생들의 인식조사)

  • Moon, Sook-Hee;Lee, Sang-Joa
    • Journal of the Korean Chemical Society
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    • v.55 no.1
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    • pp.112-123
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    • 2011
  • The chemistry has the academic system in which a concept is jointly developed into the single strain, so the contents of the chemistry I II of the high school are very important in the connection of the general chemistry in the university. At this moment, it is possible for high school graduates to be accepted into science or engineering majors without taking the chemistry II. These the highest intensive election subject cause problems of differences in level of understanding and difficult of quality educations. In this study, we have analyzed similarity between the contents of the chemistry I II and the general chemistry. We also analyzed the cognition level of students without taking the chemistry II in understanding the general chemistry level classes. We found that the high school level chemistry I and II introduced about 27% and 62% of the essential concepts required for the general chemistry, respectively. In a case of M university in Chonnam, about 70% of students in the general chemistry classes have no exposure to the chemistry II in their high schools, causing difficulty of understanding new subjects due to their insufficient concepts for classes. The lack of knowledge caused lowering of learning achievement and decrease of interests in chemistry.

A Comparative Study of Secondary Chemistry Education in Korea and China

  • Lee, Wha-Kuk;Hur, Chinhyu;Chuan, Zhou
    • Journal of The Korean Association For Science Education
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    • v.21 no.5
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    • pp.944-967
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    • 2001
  • The purpose of this study is to compare and analyze secondary school chemistry education in Korea and China in order to identify implications for the improvement of Korean chemistry education. The school systems, curricula, and teacher education related to secondary chemistry education of both countries were compared and analyzed. The 6-3-3-4 school system is used in both countries, and national school curricula are formulated by the Ministries of Education in both countries. The 1996 chemistry curricular standard for advanced middle schools in China, and 1997 chemistry curriculum for Korean high schools were compared in several aspects, followed by comparisons of chemistry teacher education in both countries. Based on the comparative analysis of chemistry education, some ideas and issues which provide implications for improving Korean high school chemistry education were identified. Chemistry teaching in the junior secondary schools, tentative implementation of curricula, required course work in chemistry, structure of curricula, oral assessments, probation of teachers and other issues are identified and discussed in this study.

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Macasiamenene V, a New Stilbenoid from the Leaves of Macaranga inermis

  • Aldin, Muhammad Fajar;Tjahjandarie, Tjitjik Srie;Saputri, Ratih Dewi;Tanjung, Mulyadi
    • Natural Product Sciences
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    • v.27 no.1
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    • pp.45-48
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    • 2021
  • One new compound, macasiamenene V (1), and two known stilbenes (2-3) were isolated from Macaranga inermis Pax & K.Hoffm leaves. The structure of 1 was fully assigned based on the information on high-resolution MS and (1D, 2D) NMR spectra. The cytotoxic of compounds 1-3 was evaluated against 4T1 and HeLa cells. Compounds 2-3 showed high activity against HeLa cells with an IC50 value of 1.09 and 0.88 ㎍/mL, respectively.