Omay Sumarna
Universitas Pendidikan Indonesia, Indonesia

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THE STUDY OF MENTAL MODEL ON N-HEXANE-METHANOL BINARY SYSTEM (THE VALIDATION OF PHYSICAL CHEMISTRY PRACTICUM PROCEDURE) Albaiti, Albaiti; Liliasari, Liliasari; Sumarna, Omay
Jurnal Pendidikan IPA Indonesia Vol 5, No 1 (2016): April 2016
Publisher : Program Studi Pendidikan IPA Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpii.v5i1.5783

Abstract

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-heksana-metanol. This study used a cloud point method to obtain data on liquid-liquid equilibrium on the system of n-hexane-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.
FIELD STUDY DEVELOPMENT OF TEACHER PROFESSIONALISM in PRIMARY SCHOOL Hayu, Wiworo Retnadi Rias; Permanasari, Anna; Sumarna, Omay; Hendayana, Sumar
DIDAKTIKA TAUHIDI: Jurnal Pendidikan Guru Sekolah Dasar Vol 6, No 2 (2019): Didaktika Tauhidi: Jurnal Pendidikan Guru Sekolah Dasar
Publisher : Universitas Djuanda

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (180.982 KB) | DOI: 10.30997/dt.v6i2.1952

Abstract

Training is an important activity for teachers to always generate knowledge, not only students who are expected to develop knowledge but educators are also obliged to strengthen field competencies. The training that is often held is not comprehensive and is still relatively rare for certain schools. Therefore, a simple description of some teachers about the learning activities carried out and the acquisition of training within the teaching period is still relatively minimal. In addition, the 2013 curriculum recommends several learning models one of which is project based learning. The fact that some of the teachers interviewed turned out to be relatively rare. Project based learning is important because it can facilitate students to learn through the process. This research method uses descriptive qualitative approach. The research subjects were teachers from various different schools. The results show that teachers still rarely get training and the implementation of project based learning models is still rarely done. The conclusion is that there is a need for comprehensive training that is not limited by circles and real examples of the application of the project based learning model.