Jurnal Pendidikan Kimia (JPKim)
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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<![CDATA[Functionalization of cyclic natural rubber grafted maleic anhydride (cnr-g-ma) with variation of ma concentration, inisiator and reaction time ]]>
<![CDATA[Boy Chandra Sitanggang]]>;
<![CDATA[Eddyanto Eddyanto]]>
<![CDATA[ Jurnal Pendidikan Kimia (JPKim) Vol 11, No 3 (2019): December ]]>
Publisher : <![CDATA[Pascasarjana Universitas Negeri Medan ]]>
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DOI: 10.24114/jpkim.v11i3.15736
<![CDATA[Cyclic natural rubber have low compatibilities when mixed with other polymer. The compatibility of a cyclic natural rubber (CNR) could be increased through grafted functional monomer to the polymer backbone. This research aims to know about influence of maleic anhydrate concentration (3-15 phr) as monomer, concentration of benzoyl peroxide (0.05-0.2 molar ratio) as initiator and times (15-90 minute) towards grafting degree of maleic anhydride. The research conducted with reflux in oil bath, at constant temperature 110ºC. The grafting degree determined with titration method and FTIR analysis used to show the existence of grafted maleic anhydrate onto cyclic natural rubber. Result of FTIR analysis showed that grafted anhydrate to cyclic natural rubber assigned with the presence of carbonyl absorptions (C=O stretching). Result titration showed that concentration of maleic anhydrate and benzoyl peroxide enhanced as well as grafting degree. While for variation of time, optimum grafting degree achieved at 60 minute.Keywords: Grafting; inisiator; natural rubber; polymer]]>
<![CDATA[Temperature effect on expression of recombinant human prethrombin-2 in Escherichia coli BL21(DE3) ArcticExpress ]]>
<![CDATA[Saronom Silaban]]>;
<![CDATA[Murniaty Simorangkir]]>;
<![CDATA[Shabarni Gaffar]]>;
<![CDATA[Iman Permana Maksum]]>;
<![CDATA[Toto Subroto]]>
<![CDATA[ Jurnal Pendidikan Kimia (JPKim) Vol 11, No 3 (2019): December ]]>
Publisher : <![CDATA[Pascasarjana Universitas Negeri Medan ]]>
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DOI: 10.24114/jpkim.v11i3.15779
<![CDATA[Many proteins produced in E. coli accumulate in inclusion bodies. This study aims to detect the role of temperature in reducing the formation of inclusion bodies during recombinant human prethrombin-2expressed in E. coli BL21 (DE3) Arctic Express host. In this study, we created a host growth curve to find out the right time to add an inducer. The inducer used in our experiment was IPTG 0.1 mM. The fermentation process use a temperature of 12°C and 22°C. The results showed that recombinant human prethrombin-2 was successfully expressed as protein soluble using an optimum temperature of 12°C in E. coli BL21 (DE3) Arctic Express. It was indicated from the 63kDa protein band obtained from the soluble fraction on SDS-PAGE. The higher temperature of fermentation increased the amount of protein in the insoluble fraction due. It concluded that the fermentation temperature affect the rate of prethrombin-2 expression.Keywords: E. coli BL21(DE3) ArcticExpress, prethrombin-2, soluble, temperature]]>
<![CDATA[Synthesis and characterization of gold nanoparticles using fruit extract of Crescentia cujete L ]]>
<![CDATA[Fauzan Amin]]>;
<![CDATA[Micha Mahardika]]>;
<![CDATA[Nada Morisca]]>
<![CDATA[ Jurnal Pendidikan Kimia (JPKim) Vol 11, No 3 (2019): December ]]>
Publisher : <![CDATA[Pascasarjana Universitas Negeri Medan ]]>
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DOI: 10.24114/jpkim.v11i3.15737
<![CDATA[Nanoparticles play important role in biotechnology such as food and drug industries. Gold nanoporticles(Au-NPS) have been wdely used in any drug therapies like drug delivery system for cancer, tumor, and diabetes treatment. Recently, Au-NPS have been devoleped to increase drug selectivity between tumor and normal cells. In the present studies, we use the fresh fruit ekstract (FFE) of crescentia cujete L mediated blue green alga for the synthesis of Au-NPS. The characterization of Au-NPS was carried out by using UV-Vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), and Transmission Electron spectroscopy (TEM). UV-VIS spectrometry indicated formation of nanoparticles which produces an intense absorbance peak at 531 nm. FTIR reveales the functional group involved in reduction and stabilization of Au-NPS. TEM have shown the morphology of Au-NPS with mean size 10,11 nm.Keywords: Crescentia cujete; gold nanoparticles; green alga]]>
<![CDATA[The effects of hand soap making practice with addition of pineapple skin extract (Ananas comosus L. Merr) on learning interests in colloidal materials in senior high school ]]>
<![CDATA[Seriana Zamili]]>;
<![CDATA[Lisa Ariyanti Pohan]]>;
<![CDATA[Uswatun Hasanah]]>
<![CDATA[ Jurnal Pendidikan Kimia (JPKim) Vol 11, No 3 (2019): December ]]>
Publisher : <![CDATA[Pascasarjana Universitas Negeri Medan ]]>
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DOI: 10.24114/jpkim.v11i3.15798
<![CDATA[Learning by practicum method is a way of delivering learning material by providing opportunities to the students to practicein order to make the students engage in planned and active learning experiences so that students' interest grows on chemistry subject. The population in this study were the students of XI class at YAPSI Senior High School in Medan. The sampling technique is done by using the Quota sampling technique. The instruments were the student’s interests in questionnaire and student activeness observation sheet. The requirements test is in the form of normality test and homogeneity test with the value of Lcount = 0.663 initial interests data and Lcount = 0.172 final interests data which means the data is normally distributed. In the homogeneity test Fcount = 0.233 initial interests data and Fcount = 0.449 final interests data with homogeneous results. The data analysis technique was done by using the hypothesis t test and N-gain test. The results showed that the hand soap making practice with the addition of pineapple extract (Ananas comosus L.. Merr) had an influence on students’ learning interest with N-gain of 7.6 in experimental class data and N-gain of 5.4 in control class data and from the t hypothesis test obtained Tcount> Ttable which Tcount = 6.90 and Ttable at level 0.05 is 2.01 so Ho is accepted, which means that there was an influence of the handsoap making practice with the addition of pineapple skin extract (Ananas comosus L. Merr) on student interests in learning.Keywords: Colloid; hand soap making practice; interests]]>
<![CDATA[The development paired cards using problem based learning on student competency ]]>
<![CDATA[Ramadhani Putri Lestari]]>;
<![CDATA[Marini Damanik]]>;
<![CDATA[Agus Kembaren]]>
<![CDATA[ Jurnal Pendidikan Kimia (JPKim) Vol 11, No 3 (2019): December ]]>
Publisher : <![CDATA[Pascasarjana Universitas Negeri Medan ]]>
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DOI: 10.24114/jpkim.v11i3.15738
<![CDATA[This study discusses development of paired cards using problem based learning model on learning outcomes and students critical thinking skills on the oxidation reduction reactions. This study aims to find out learning outcomes and critical thinking students who taught with problem based learning model using paired cards. The populations were all students of class X MIA in High School, which consists of eight classes with a total number of students 296 students. The sample was taken by random sampling techniques is experimental class and control class. Students in experimental class were taught using problem based learning model, while control class were taught using direct instruction model. The results showed that average for the student learning outcomes 75.16 for experimental class and 70.63 for control class. The average students critical thinking skills were 40.17% for experimental class and 31.49% for control class. The student learning outcomes and critical thinking skills use problem based learning models with paired card was higher than the direct instruction model on the reduction oxidation reaction. There is a positive correlation between learning outcomes and students critical thinking skills.Keywords: Paired cards; problem based learning; oxidation reduction reaction]]>
<![CDATA[Development of chemical element practical workbook based on projects and characters for class xii senior high school ]]>
<![CDATA[Bajoka Nainggolan]]>;
<![CDATA[Martin Simamora]]>;
<![CDATA[Wesly Hutabarat]]>
<![CDATA[ Jurnal Pendidikan Kimia (JPKim) Vol 11, No 3 (2019): December ]]>
Publisher : <![CDATA[Pascasarjana Universitas Negeri Medan ]]>
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DOI: 10.24114/jpkim.v11i3.15733
<![CDATA[This investigation based on analysis, design, development, implementation, and evaluation (ADDIE) method intended to develop an innovative chemistry laboratory workbook of Chemistry Element integrated with project-based learning and characters. Two chemistry lecturers and teachers respectively selected to validate three local chemistry laboratory workbook and chemistry laboratory workbook developed. Questionnaires distributed to the lecturer and teacher samples and found that content, language, presentation, and feasibility of graphics scores were 3.31, 3.37, 3.22, 3.15 and 3.15 respectively and the average score was 3.26 which means that the chem. Lab workbook developed is very valid. In addition, student samples consisted of 2 classes of grade XII of science students which classified into experimental group and Controled group. The developed chemistry laboratory workbook and the conventional workbook were tried out to group Experiment and group Controlled respectively. The average scores of student outcomes in group Experiment was higher than group Controled or 87.5%>73.8%. Then the average psychomotor scores of group Experiment was larger than group controled or 84.64>78.42. In addition, the affective scores of group Experiment was larger than group Controled or 82.78>76.38. The hypothesis tested with one way ANOVA at the significant level of α = 0.05, and found that tCalc > tTable or 4.536 > 1.697 It is concluded that the Innovative chemistry laboratory workbook is highly very good.Keywords: Chemistry laboratory workbook; chemistry element; project-based learning]]>
<![CDATA[The development of chemistry practicum e-module based on simple-practice ]]>
<![CDATA[Nelius Harefa]]>;
<![CDATA[Leony Sanga Lamsari Purba]]>
<![CDATA[ Jurnal Pendidikan Kimia (JPKim) Vol 11, No 3 (2019): December ]]>
Publisher : <![CDATA[Pascasarjana Universitas Negeri Medan ]]>
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DOI: 10.24114/jpkim.v11i3.15739
<![CDATA[Practicum is an important element in chemistry. In chemistry learning with practical methods students are given the opportunity to be creative, find, or prove a phenomenon that he experienced and the concepts his learned. Therefore, it is important to develop the learning method using practicum to accommodate the progress and needs of the times so that learning is close to students so that learning becomes meaningful. In this research, the development of digital integrated chemistry practicum modules based on simple practice is carried out. The research sample consisted of 248 students and 26 chemistry teachers, and was validated by 3 expert judges. In the initial stage, the module developed is validated by expert judges. The validation results show that the module is categorized as valid in terms of content eligibility, language feasibility, and presentment eligibility with an average score of 3.81 (scale 4). In the final stage, a module testing is conducted for chemistry students and teachers in the form of collecting responses. Chemistry teacher response results indicate that the module is feasible to be used as a source of student learning on chemistry practicum class XI high school even semester with an average score of 3.78 (scale 4). The results of the students' responses showed that the module was appropriate for them to use as a source of learning on chemistry practicum with an average score of 3.79 (scale 4). The results of student responses on the presentment eligibility aspect showed the highest value of 3.98 (scale 4), the module developed was presented digitally integrated which can be accessed online.Keywords: Chemistry; e-module; practicum; simple-practice]]>
<![CDATA[The implementation of learning model and virtual lab toward learning outcome of chemistry education ]]>
<![CDATA[Gulmah Sugiharti]]>;
<![CDATA[Abdul Hamid]]>;
<![CDATA[Mukhtar Mukhtar]]>
<![CDATA[ Jurnal Pendidikan Kimia (JPKim) Vol 11, No 3 (2019): December ]]>
Publisher : <![CDATA[Pascasarjana Universitas Negeri Medan ]]>
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DOI: 10.24114/jpkim.v11i3.15734
<![CDATA[The abundance of chemical concepts and general chemistry lessons that tend to be monotonous and have not yet considered the ability of mathematical thinking to cause problems in learning that resulted in low student learning outcomes. Even though the concept can be related to students' daily lives by applying effective learning models in accordance with teaching materials. The purpose of this study was to determine whether there were significant differences in learning outcomes between the classes taught with PBL models and the classes taught in the DI model in the General Chemistry course at the Chemistry Education department of FMIPA Unimed. The population consists of 2 classes, each of which consists of 26 students taught with different learning models. After the data is tested normal and homogeneous by using SPSS, the hypothesis is tested using t test. Based on the results of the hypothesis test, it is known that the value of Sig. 0.065 <0.10. So it was said that there were significant differences in learning outcomes of classes taught with PBL models with classes taught with the DI model in General Chemistry courses. This study concludes that for the General Chemistry subject learning, it is better to use the PBL model than the DI model.Keywords: DI model; general chemistry; project-based learning model; virtual lab]]>
<![CDATA[The effect of composition and substrate fermentation duration on microbial fuel cell electrical energy ]]>
<![CDATA[Christin Vera Natalia Ginting]]>;
<![CDATA[Jumaida Sari Nasution]]>;
<![CDATA[Malik Alfatah Sembiring]]>;
<![CDATA[Murniaty Simorangkir]]>
<![CDATA[ Jurnal Pendidikan Kimia (JPKim) Vol 11, No 3 (2019): December ]]>
Publisher : <![CDATA[Pascasarjana Universitas Negeri Medan ]]>
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DOI: 10.24114/jpkim.v11i3.15773
<![CDATA[Organic vegetable wastes such as mustard vegetables found in traditional markets, especially Medan, are quite abundant and the increase in electricity demand is not matched by the availability of adequate energy sources, encouraging efforts to find alternative sources of renewable energy, economical and environmentally friendly. Microbial Fuel Cell (MFC) reactors can be used as an alternative energy source that converts chemical energy into electrical energy through biocatalytic reactions using microorganisms by utilizing organic materials. This study aims to determine the effect of the use of mustard vegetable waste substrate with a variety of starters and fermentation duration in the MFC reactor system to the voltage and current of electrical energy generated. The design of this study used a factorial 4x2 Completely Randomized Design consisting of two factors, namely factor A substrate composition and fermentation duration B factor. The results showed that there was an influence of substrate composition and fermentation duration on the MFC reactor system on the electrical energy generated by the system. Electricity (I) (20.1 mA) and voltage (72.13 mV) highest electricity produced by MFC reactor with composition of glucose substrate and EM4 starter with 5 days fermentation duration, followed by the treatment of vegetable mustard waste and EM4 with a fermentation duration of 5 days (15.2 mA and 68.76 mV). In terms of economics, the use of vegetable mustard waste substrate material with EM4 starter in the MFC reactor has more potential to be developed than using glucose substrates which are relatively more expensive.Keywords: Electric energy; fermentation duration; microbial fuel cell; mustard vegetable waste]]>
