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KMID : 1059520060500050404
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Journal of the Korean Chemical Society
2006 Volume.50 No. 5 p.404 ~ p.414
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Understanding and Improvement of an Experiment Measuring Chemical Reaction Rates by Monitoring Volume Change of a Gas:On the Reaction between HCl(aq) and Mg(s)
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정대홍/Jeong DH
방정아/윤희숙/최원호/Bang JA/Yoon HS/Choi WH
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Abstract
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In this study we analyzed and improved an experiment measuring chemical reaction rates introduced in the high school science textbooks through an understanding of the phenomena observed in carrying out the experiment. For this purpose, the contents of textbooks related to the experiment were analyzed, and the problems observed in carrying out the experiment were addressed through experimental analysis. When the experiment was carried out by the method of aquatic transposition presented in textbooks, the observed volume change of H2 gas was delayed and chemical reaction rate was increased in the early stage of reaction period. To resolve these problems, an improved method for measuring the reaction rates was suggested. In the improved experiment the reaction rate was measured to be constant on time, which was interpreted in terms of the concentration of H+ and the surface area of magnesium.
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