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标题：THE STUDY OF MENTAL MODEL ON N-HEXANE-METHANOL BINARY SYSTEM (THE VALIDATION OF PHYSICAL CHEMISTRY PRACTICUM PROCEDURE)
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作者：Albaiti ; Albaiti ; Liliasari 等
期刊名称：Jurnal Pendidikan IPA Indonesia
印刷版ISSN：2339-1286
电子版ISSN：2089-4392
出版年度：2016
卷号：5
期号：1
页码：6-13
DOI：10.15294/jpii.v5i1.5783
语种：English
出版社：Universitas Negeri Semarang
摘要：N-hexane and methanol systen is one example of a binary system that shows the solubility properties of reciprocity. This study aimed to assess the mental model of a n-hexane-methanolbinary system. Interaction at the submicroscopic level between n-hexane and methanol molecules is described in the form of mental model. Penelitian ini menggunakan cloud point method untuk memperoleh data kesetimbangan cair-cair sistem n-heksanametanol. This study used a cloud point method to obtain data on liquid-liquid equilibrium on the system of nhexane-methanol. Research data showed the maximum critical temperature (above the consolute temperature) of this system was at 42.95 °C with Xmethanol = 0.475 (P= 715 mmHg). Data from the laboratory observations was representedas a symbolic level in the form of the curve of correlation between mole fraction of methanol with temperature in a phase diagram system of n-hexane-methanol. The curve that was formed was asymmetric. It indicated that the solubility of n-hexane in methanol was relatively small compared to the solubility of methanol in n-hexane. Mental model of the binary system of n-hexane-methanol in four curve areasin the form of visualization of the interaction between n-hexane and methanol molecules through London force. In thermodynamics, each component had the same chemical potential inboth phases at equilibrium state. This study results could have a contribution to form a mental model on the student as the prospective chemistry subject teachers.
关键词：n-hexane-methanol system; mental model; macroscopic level; submicroscopic level; symbolic level