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Jurnal Pendidikan Kimia (JPKim)

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Published by Universitas Negeri Medan

ISSN : 20853653 EISSN : 25493116 DOI : 10.24114

Core Subject : Science, Education, Social,

Biochemistry, Genetics & Molecular Biology Chemistry Education Environmental Science

Jurnal Pendidikan Kimia (JPKim) yang dikelola Program Pascasarjana Universitas Negeri Medan terbit 3 kali setahun, yakni bulan April, Agustus dan Desember. JPKim menerbitkan artikel ilmiah hasil-hasil penelitian pendidikan kimia dan kimia fundamental. JPKim juga menerbitkan artikel Review terkait Pendidikan Kimia dan Kimia.

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Articles 5 Documents

Search results for , issue "Vol 10, No 2 (2018): August" : 5 Documents clear

Development of chemical practice guides class xi project based to improve student’s chemical learning outcomes on acid base materials Bajoka Nainggolan; Ita Sri Apika Pinem; Wesly Hutabarat
Jurnal Pendidikan Kimia (JPKim) Vol 10, No 2 (2018): August
Publisher : Pascasarjana Universitas Negeri Medan

Abstract: This study aims to obtain a standard project-based laboratory chemistry guide for class XI students of Second semester on acid base material. The sample consists of 3 tutorial guide publisher A, B, and C, 2 teacher of senior high school (SMA) 4 Medan, 2 Unimed chemistry lecturer and 2 class XI SMA 4 Medan. Research is descriptive and experimental development with ADDIE models. The results show that the guides have been developed and the standards are in accordance National Education Standards Agency (BSNP). Result validation practice guides developed get the average score of 3.48 times higher than the standard practicum guide A = 3.18, B = 3.32; and C= 30.75. Experimental practice test improves the average learning outcomes of experimental class 1 (using development guide) 70.8% and experiment 2 (using textbook) 54.1%. Psychomotoric and affective grade experiment class 1 higher than the experimental class 2. The resultant learning improvement data was analyzed by right t test. Test of t-test for learning result obtained t count and t table, 6.68 and 1.678, respectively, at level 0.05. This indicates that the project-based practice guide has been well developed and feasible for chemical learning in senior high school.Keywords:acid base material; development; laboratory guide; project based learning

Optimization of Indonesia biodiesel production from rubber seed oil using natural zeolite modification Junifa Layla Sihombing; Ahmad Nasir Pulungan; Poppy Lindawati; Adittiya Prayoga; Intan Ayu Safitri; Clara Nur Wandani; Lastri Anita Silitonga; Ambarwati Ambarwati; Puji Prayugo; Ary Anggara Wibowo
Jurnal Pendidikan Kimia (JPKim) Vol 10, No 2 (2018): August
Publisher : Pascasarjana Universitas Negeri Medan

Abstract: The purpose of this research is to find the optimization process of biodiesel production from rubber seed oil using natural zeolite modification. The method of this research are using 1) Modification of Natural Zeolite Using NH4NO3, 2) Characterization of catalyst using FTIR and XRD, 3) Esterification and transesterification of rubber seed oil at 30oC, 40oC, 50oC and 60oC for 2 hours in each step using H-Zeolite, and 4) Analyzation of liquid product using Gas Chromatography (GC). The result of this research shown that the best conversion of rubber seed oil into methyl ester fatty acid of about 76.43% with Methyl linoleate component reached 38.23% at 60oC. Moreover, the characterization of catalyst revealed that there is no a significant change in terms of mineral content and crystallinity between natural zeolite and its modification which are showed as mordenite with triclinic crystal system. In essence, H-zeolite can optimize the production biodiesel.Keywords:biodiesel; H-zeolite; natural zeolite modification; rubber seed oil

Mapping learning difficulties in general chemistry course Asyti Febliza; Putri Ade Rahma Yulis
Jurnal Pendidikan Kimia (JPKim) Vol 10, No 2 (2018): August
Publisher : Pascasarjana Universitas Negeri Medan

Abstract: Many first semester students in University struggle to study chemistry, it proven by low achievement of students in learning general chemistry. This study investigated student’s difficulties to understand in term of chemistry material characteristics (fundamental concept, advanced concept, mathematical concept and misconception) and learning process in the class. This investigation includes a coginitve test and a difficulty questionnaire were given to 92 first semester students in Biology program Universitas Islam Riau-Indonesia who took general chemistry course. Research questions in this study were: 1) What topics did students find difficult?; 2) Which chemistry material indicators did students feel difficult?; 3) How did student’s perceptions about learning chemistry before and after learning process in college?. The result gave information that student’s difficulties mostly existed in average level in chemical bonding about 84 students, stoichiometry around 52 students and higher level of barrier in colligative properties topics reached 52 students. Furthermore, students felt higher difficult in three indicators in term of mathematical concept, advanced concept and misconception with number reached 46%, 65% and 61% respectively. Difficulty questionnaire showed the slightly dropping around 9% before and after learning process. Overall, the difficulties encountered in average level and higher level. Topic that sudents felt difficult were: chemical bonding, stoichiometry and colligative properties, which each topic contained higher skill such as advanced concept, mathematical skill and misconception. The minor dip in student’s perception can give us information about quality changes after learning process.Keywords:basic chemistry; learning difficulties indicator; student’s difficulties; students’s perception

The differences of students learning outcome with numbered head together (NHT) and think pair share (TPS) in atomic structure Feri Andi Syuhada
Jurnal Pendidikan Kimia (JPKim) Vol 10, No 2 (2018): August
Publisher : Pascasarjana Universitas Negeri Medan

Abstract: This study determine the differences between student learning outcomes using model of the NHT and TPS type of cooperative teaching on the subject of atomic structure. The population in this study were all grade X at SMA Negeri 1 Percut Sei Tuan. There were 9 classes. The samples were 2 classes with 68 students. The first class was used cooperative teaching model of NHT while the second class was used cooperative teaching model of TPS. The result of the study shows that the application of these two types give influence to the result of student learning outcome in chemistry. The average point of post test for first class is (73.82 + 11.20) and the second class is (77.41 + 10.77).The result is tcount<ttab (-1.34<1.998) with α=0.05, this value conclude that there are no significant differences between student learning outcome by using cooperative teaching model with NHT type and TPS on the subject of atomic structure.Keywords:atomic structure; learning outcome; NHT; TPS

The optimization of acid hydrolysis on bioethanol production from durian peel waste (Durio zibethinus murr) Shanta Noventhya Ginting; Epi Kristina Simanullang; Lindu Parningotan Simanullang; Bajoka Nainggolan; Saronom Silaban
Jurnal Pendidikan Kimia (JPKim) Vol 10, No 2 (2018): August
Publisher : Pascasarjana Universitas Negeri Medan

Abstract: The dependence on fossil fuels is a big problem and needs an urgent solution. One of the steps taken is the utilization of bioethanol "lignocellulose". This research uses natural material with high lignocellulose content that is durian peel waste and aims to make durian peel waste as raw material of bioethanol production with variation of H2SO4 concentration, temperature, and acid hydrolysis time. The variable used is H2SO4 concentration of 1%, 3%, and 5%; temperature of 100˚C, 120˚C, and 140˚C; and time of 120 minutes, 150 minutes, and 180 minutes. From the analysis, the highest bioethanol purity was obtained at 99.81% at 100˚C and hydrolysis time at 120 minutes.Keywords:acid hydrolysis; bioethanol; durian peel waste; optimization

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Editorial Address Jl. William Iskandar Psr. V Medan Estate, Medan-Indonesia

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Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
jpkim.pps@unimed.ac.id

Editorial Address
Jl. William Iskandar Psr. V Medan Estate, Medan-Indonesia

Location
Kota medan,

Sumatera utara

INDONESIA