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KMID : 1059520080520030303
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Journal of the Korean Chemical Society
2008 Volume.52 No. 3 p.303 ~ p.314
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Analysis of Precipitate Formation Reaction for Measuring Chemical Reaction Rate and Its Development Appling Small-Scale Chemistry
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Park Kuk-Tae
Ryu Ran-Yeong
Kim Dong-Jin
Lee Sang-Kwon
Noh Ji-Hyun
Noh Yun-Mi
Kim Myo-Kyung
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Abstract
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The purpose of this study was to understand the experiment for measuring chemical reaction rate by precipitate formation and to develop experiments applying small-scale chemistry. For this study, the experimental method for measuring the effect of concentration and temperature on chemical reaction rates presented in the 10 high school science textbooks were classified by their experimental methods of confirming production. Subsequently, problems observed in carrying out the experiments for measuring chemical reaction rates by precipitate formation frequently presented in the 10 high school science textbooks were analyzed. Experiments applying small-scale chemistry were developed measuring chemical reaction rate by precipitate formation. According to the result of this study, there were some problems in the experimental method of precipitate formation for measuring chemical reaction rates presented in the high school science textbooks. Those problems in the science textbook experiments were insufficient specification of mixing methods of reaction solutions, obscurity of knowing when the character letter X disappeared, time delay in collecting the experimental data, formation of hazardous sulfur dioxide, uneasiness of fixing water bath container, controlling the reaction temperature, and low reproducibility. Those problems were solved by developing experiments applying smallscale chemistry. Presenting the procedure of mixing reaction solutions on the A4 reaction paper sheet made the experimental procedure clearly, using well plates and stem pipette shortened the reaction time and made it possible to continuously collect the experimental data. Furthermore, the quantity of hazardous sulfur dioxide was reduced 1/7 times and the time when the character letter X disappeared could be observed clearly. Since experiments for measuring the effect of concentration and temperature on chemical reaction rates could be performed in 30 minutes, the developing experiments applying SSC would help students understand the scientific concepts on the effect of concentration and temperature on chemical reaction rates with enough time for experimental data analysis and discussion.
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KEYWORD
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Small-Scale Chemistry (SSC), High School Science Textbooks, Measuring Chemical Reaction Rates, Effect of Concentration and Temperature on Chemical Reaction Ra
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