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Results in Journal Jurnal Pendidikan Kimia: 94

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Tiurma Solomasi Zega, Putri Mandaoni Pakpahan, Rahmayani Siregar, Givinda Sitompul, Saronom Silaban
Jurnal Pendidikan Kimia, Volume 13, pp 151-158; https://doi.org/10.24114/jpkim.v13i2.26989

Abstract:
The Simargaolgaol (Aglaonema modestum Schott ex Engl) plant is a plant that grows wild in Barus District, Central Tapanuli, North Sumatra which is used by the community as a medicinal plant. This study aims to determine the antibacterial activity of n-hexane, ethyl acetate and ethanol extracts from Simargaolgaol leaves against Escherichia coli and Salmonella typhi bacteria. The antibacterial activity test of Simargaolgaol leaves was carried out using the disc diffusion method. The results of antibacterial activity showed that the highest inhibitory power of Simargaolgaol leaf extract was ethanol extract (polar), ethyl acetate extract (semi polar) and n-hexane extract (non polar). The inhibitory power of ethanol extract, ethyl acetate, and n-hexane against Escherichia coli bacteria was 13.1 mm (strong); 9.7 mm (medium); 8.0 mm (medium) and for Salmonella typhi bacteria respectively 11.2 mm (strong); 10.7 mm (strong) and 9.3 mm (medium). With the concentration of the extract in the diameter is 10%. Based on this, it can be concluded that Simargaolgaol leaf extract has potential as an antibacterial. Keywords: Aglaonema modestum Schott ex Engl, Antibacterial activity, Escherichia coli, Salmonella typhi
Leony Sanga Lamsari Purba
Jurnal Pendidikan Kimia, Volume 13, pp 130-136; https://doi.org/10.24114/jpkim.v13i2.26981

Abstract:
This study aims to determine the effectiveness of online learning using Microsoft Teams 365. The entire population in this study was used as a research sample, namely all students of the Chemistry Education study program, Indonesian Christian University, Jakarta. Perception data was collected using a questionnaire with dimensions of understanding the material, appearance and accessibility of Microsoft Teams 365. From the results of data processing, it was found that more than 50% of students' perceptions of Microsoft Teams 365 were good in all indicators of understanding the material and appearance. On the use dimension with connectivity and accessibility indicators more than 50% of students' perceptions of the Microsoft 365 team are good, but on the quota-saving indicator 42% of students do not agree. Keywords: Microsoft teams, E-learning, Cemistry
Rina Safitri, Haryanto Haryanto, Harizon Harizon
Jurnal Pendidikan Kimia, Volume 13, pp 113-129; https://doi.org/10.24114/jpkim.v13i2.26980

Abstract:
The development model used is Research & Development which adopts the Lee & Owens development model. The product to be developed is E-LKPD using 3D Pageflip Professional software. 1. The procedure for developing E-LKPD with the PBL-STEM approach in improving scientific literacy skills on the reaction rate material for students. The research procedure consists of five stages, namely analysis, design, development, implementation, evaluation. Research results (1) The analysis includes media analysis, student characteristics analysis, technology analysis, situation analysis, and data analysis. (2) Design includes determining the development team, compiling a development schedule, making flowcharts and making storyboards. (3) Development includes making a product which is then validated by a team of experts until it is validated. (4) Implementation, at this stage a product assessment is carried out by 2 chemistry teachers to see the agreement between the two teachers on the product developed through the kappa test, one-on-one trial with 2 groups of respondents consisting of 3 students in each group, small group trial with two groups of respondents carried out at MAN 2 Jambi City. This trial is not conducted face-to-face, but online (5) Evaluation, which is carried out at each stage is ongoing. The conclusion in this study is that the E-LKPD development procedure is in accordance with the 5 stages of the Lee & Owens development model. Keywords: E-LKPD, PBL-STEM, Science literacy skills
Kasta Gurning, Sifikal Lumbangaol, Risanti F. R. Situmorang, Saronom Silaban
Jurnal Pendidikan Kimia, Volume 13, pp 137-142; https://doi.org/10.24114/jpkim.v13i2.26984

Abstract:
The research objectives were to identify the secondary metabolite components, total phenolic content and determine the antioxidant activity of the ethanol extract of red betel leaf (Piper crocatum Ruiz & Pav.). The extraction process was carried out by materation using ethanol as a solvent. Determination of total phenolic content was carried out colorimetrically with Folin-Ciocalteu reagent measured at a maximum wavelength of 765 nm. Determination of antioxidant activity using the DPPH method measured by spectrophotometry at a maximum wavelength of 517 nm. The results of phytochemical screening of the ethanolic extract of red betel leaf contain secondary metabolites, including flavonoid, phenolic, tannin, alkaloids, steroids, and triterpenoids. The total phenolic content of the red betel leaf ethanol extract was 0.949±0.003 mg GAE/g d.w. and has antioxidant activity (IC50) 84,656 including strong category as an antioxidant. Keywords: Piper crocatum Ruiz & Pav., Antioxidant, Ethanol extract, Folin-Ciocalteu and DPPH
Bropson Minanlarat, Leony Sanga Lamsari Purba, St Fatimah Azzahra
Jurnal Pendidikan Kimia, Volume 13, pp 94-102; https://doi.org/10.24114/jpkim.v13i2.26977

Abstract:
This study aims to determine the effect of explicit instruction learning models and the percentage of student learning outcomes improvement in chemistry. Explicit instruction learning model is the free variable while the dependent variable is learning outcomes. This research method is a quasi experiment with the research design nonequivalent control group design. The population of this study were students of Senior High School 42 Jakarta, the sample was selected by purposive sampling technique, consisting of two classes, namely class XI MIA 1 as the experimental class and XI MIA 2 as the control class. The results of the ttest show that the sig. (2-tailed) is smaller than the α value, namely sig 0.000 < sig 0.05, so learning using the explicit instruction model has a significant effect on improving chemistry learning outcomes on hydrocarbon compound material. In addition, the use of explicit instruction learning models can improve student learning outcomes by 19% when compared with the use of conventional learning models (TCL). Keywords: Explicit instruction, Quizizz, Chemistry learning, Learning outcomes
Sinda Febrilia Miharti, Harizon Harizon, Zurweni Zurweni
Jurnal Pendidikan Kimia, Volume 13, pp 103-112; https://doi.org/10.24114/jpkim.v13i2.26979

Abstract:
This study aims to determine how the procedure for developing blended learning worksheets based on guided inquiry models and science process skills on the material of reduction and oxidation reactions in SMK. The method used in this research is to follow the Lee and Owens development model consisting of 5 stages of development, namely Analysis, Design, Development, Implementation and Evaluation. Analysis includes analysis of needs, characteristics of students, objectives, materials and technology. Design, researchers determine the schedule and development team, median specifications, prepare materials and make Flowcharts and storyboards. Development, develop LKPD according to storyboards, validated by material and media experts, and assessed by the teacher. Implementation includes group trials and effectiveness tests. Evaluation of LKPD in accordance with test results. Keywords: Blended learning, Guide inquiry, Reaction of reduction and oxidation, Science process skill, Student worksheet
Erdiana Gultom, Hestina Hestina, Nova Florentina, Barita Aritonang
Jurnal Pendidikan Kimia, Volume 13, pp 159-171; https://doi.org/10.24114/jpkim.v13i2.27028

Abstract:
Research on paper made from coconut and tofu waste has been carried out using the alkalization method of separation technique, with the optimum composition as follows: NaOH concentration used is 3.0% and cooking temperature is 100 0C and the time required is 90 minutes. The results of the catheterization test of paper made from coconut dregs and tofu have a water content of 3.2%; pH 6.9, pulp content 65.75%; cellulose content 80.22%; lignin content 18.27%. The results of the FT-IR spectrum analysis of coconut pulp and tofu pulp are suitable for use as raw materials for making paper because they contain cellulose fibers. This is indicated by the appearance of the O-H hydroxyl group which is observed at a wavenumber of 3312 cm-1. Based on the SEM results, the surface morphology of the coconut pulp and tofu combination paper shows that the surface structure is the denser the fiber bonds, the smaller the fiber diameter, the better the mechanical properties. The results of the research conclusions explain that, paper made from coconut and tofu waste has met the requirements set by SNI 14-0444-1989. Keywords: Paper, Cellulose, Coconut pulp, Tofu pulp, Lignin
Dedi P Simatupang, Nora Susanti, Jamalum Purba
Jurnal Pendidikan Kimia, Volume 13, pp 143-150; https://doi.org/10.24114/jpkim.v13i2.26986

Abstract:
This research to decide the consequences of expanding the steadiness of the concentrate and part of incense with the expansion of glycerol and tween 80 by contrasting the reference tests of frankincense separates available. The technique utilized in this examination depends on the expansion of glycerol and tween 80, just as directing boundaries of consistency, organoleptic, pH and investigation of substance content of concentrates and parts with GC-MS instruments. The outcomes got in this investigation demonstrate the actual properties of the concentrate and part of the incense sap as a thick fluid, earthy red and has an unmistakable fragrant smell. The consistency got from the thickness test was 277.68 Cp. In the meantime, the thickness estimation consequences of the reference test acquired a consistency worth of 326.54 cP. What's more, has a pH scope of 4.0-5.5. The fundamental synthetic parts of the extraction results and the isoprophyl part of styrax benzoin and the reference part of the reference styrax benzoin remove dependent on the consequences of the investigation discovered 6 mixtures that share practically speaking, in particular Benzoic corrosive, Vanillin, trans-Cinnamic corrosive, (Z) - Cinnamyl benzoate, 2-Propenoic corrosive , 3-phenyl-, phenylmethyl ester, (E) - and Cinnamyl cinnamate. Keywords: Styrax benzoin, Glycerol, Extract stability, Tween 80, Fractionation
Nelius Harefa, Arifman Gulo, Saronom Silaban
Jurnal Pendidikan Kimia, Volume 13, pp 38-47; https://doi.org/10.24114/jpkim.v13i1.24142

Abstract:
Environmental pollution caused by waste is pollution that very dangerous for living things. In particular, water pollution, waste that is disposed of through waterways will disrupt the water ecosystem which will have an impact on human life. On the other hand, the development of entrepreneurship such as home industry has a positive impact on society, especially in terms of the economy. Therefore, water pollution indicators are needed that can be used as guidelines in treating wastes such as BOD and COD. In this study, analyzed the levels of BOD and COD from home industry wastewater in the Cawang area. The home industry includes laundry, cracker business, restaurants, printing houses, photocopying, and snack businesses. Based on the results of data analysis, the highest BOD level was 45.827 in samples taken at night. And, the highest COD levels were 95.923 in samples taken at night. These data indicate that the levels of BOD and COD in the water in the home industry waste disposal sites are below the standard threshold for wastewater quality. The levels of BOD and COD are in the safe category for aquatic biota. Keywords: BOD levels, COD levels, Waste, Water pollution
Rodi Edi, Maefa Eka Haryani, Eka Ad’Hiya
Jurnal Pendidikan Kimia, Volume 13, pp 48-53; https://doi.org/10.24114/jpkim.v13i1.24143

Abstract:
This research is a descriptive survey research to analyze student needs for chemical literation integrated problem solving modules. The questionnaire was given to 89 active students of chemistry education at Sriwijaya University who were selected using a non-probability sampling technique. The results of the questionnaire were then analyzed using descriptive statistical tests. The results of this study indicate that students understand the qualifications needed as an undergraduate and are in the process of achieving this, and they agree to develop problem-solving integrated chemical literacy based basic chemistry modules as teaching materials that can help them to achieve the competences. Keywords: Chemical literation, Problem-Solving, Module, Chemistry
Risma Siahaan, Marham Sitorus, Saronom Silaban
Jurnal Pendidikan Kimia, Volume 13, pp 60-68; https://doi.org/10.24114/jpkim.v13i1.24145

Abstract:
This study aims to determine the feasibility of teaching materials oriented critical thinking ability grade XI SMA developed. This research includes research and development with 3D development model (define, design and develop). The teaching materials developed were validated based on aspects of material feasibility, language and media by experts using validation sheets in accordance with BSNP standards and then the validated teachng materials were distributed to two teachers and grade XI students at Sultan Agung Private High School and SMAN 1 Pematangsiantar to find out the response of teachers and students using questionnaires. The results of the study found that expert validation of teaching materials developed has an average score of 4.17 in terms of content feasibility, 4.20 for the aspect of presentation feasibility, 4.33 for the linguistic aspect and 4.19 from the aspect of graphation. While students' response to critical thinking ability-oriented module teaching materials had average scores of 3.80 and 3.82 and teacher responses averaged a score of 4.27, judging by interest indicators, material indicators and language indicators. These results show that the critical thinking ability-oriented teaching materials developed have met valid and good criteria for use. Keywords: Teaching materials, Critical yhinking skills, Chemical equilibrium, 3D models
Zainuddin Muchtar, Sri Adelila Sari, Siti Rahmah, Moondra Zubir, Rini Selly, Marini Damanik
Jurnal Pendidikan Kimia, Volume 13, pp 85-93; https://doi.org/10.24114/jpkim.v13i1.24212

Abstract:
The Covid-19 pandemic forces learning activities to change from classroom learning to online-based learning. Based on the results of the interview, it was found that the teachers at Nurul Fadhilah school did not yet have the readiness to manage online teaching and learning activities, especially in science subjects. The influencing factors are (1) understanding of basic science concepts (physics, chemistry, biology), (2) understanding of systematic online learning management and (3) mastery of Learning Management System (LMS) technology. Therefore, the aim of this activity is to implement LMS technology in the management of online science learning using a basic conceptual approach to chemistry education. LMS is a technology application developed specifically for managing classrooms, distributing learning materials and enabling collaboration between students and teachers online. The LMS used in this activity is Google Classroom. Based on the data, it is known that 65% of the teachers at Nurul Fadhilah School have not managed online science teaching and learning activities using LMS technology. The results of the systematic online science learning management workshop using the basic concepts of chemistry education and the implementation of LMS technology, especially Google Classroom, showed an increase, as many as 80% of teachers have created, designed and managed classes interactively using Google Classroom LMS technology and have integrated the concept of basic chemistry education in science learning. So that students are more happy and comfortable in learning online and are more disciplined in collecting assignments and teachers are more comfortable in managing and evaluating student assignments. Keywords: Natural science, Learning management system, Google classroom
Gulmah Sugiharti, Aldhi Kurnia
Jurnal Pendidikan Kimia, Volume 13, pp 54-59; https://doi.org/10.24114/jpkim.v13i1.24144

Abstract:
This study aims to determine whether there is a difference between the use of virtual lab and real lab media in guided inquiry learning on learning outcomes in the buffer solution material. Both learning media are taught using the same learning model, namely the guided inquiry learning model. The samples in this study were class XI MIPA 3 as the experimental I which was taught with the guided inquiry learning model using virtual lab media and class XI MIPA 6 as the experimental II which was taught by guided inquiry learning model using real lab. The instrument used in this research was a test of learning outcomes chemistry of the buffer solution material. The data analysis technique for hypothesis testing was the two-party t-test statistic. The results of data processing showed that the experimental I had a pretest mean of 26.04 and a mean of posttest 79.53, while the experimental II had a mean pretest of 47.95 and a mean of posttest of 72.84. Hypothesis testing was carried out using two-party t test from the learning outcomes data and it was obtained tcount = 2.201 while ttable = 1.988 for α = 0.05 so that tcount> ttable. So Ha accept, that is, there are differences in student learning outcomes taught by guided inquiry models using virtual lab and real lab media. Meanwhile, the increase in student learning outcomes in guided inquiry classes using virtual labs was 72%, and those using real labs were 52%. Keywords: Virtual lab, Real lab, Guided inquiry, Buffer solutions
Sri Wartika, Zainuddin Muchtar, Wesly Hutabarat
Jurnal Pendidikan Kimia, Volume 13, pp 78-84; https://doi.org/10.24114/jpkim.v13i1.24147

Abstract:
This research aims to develop learning material in the form of colloid learning system module integrated with PjBL model in accordance with curriculum 2013 and to find out the increasing of students learning result after using learning module of colloid system integrated with Project Based Learning (PjBL) system. The type of the study is development research and experiment. It examines how the module of Integrated with Project Based Learning (PjBL) integrated with PjBL model is organized based on curriculum 2013 and the experiment is managed by analyzing the using of the module in senior high school. The study was carried out to the students of 9th grade of SMA Negeri 1 Sunggal and SMA Swasta Muhammadiyah 18 Sunggal school year of 2018/2019 in second semester. The data are examined by using independent sample of T-test by using SPSS 23 program. The result shows that colloid system module integrated with PjBL developed model is valid and appropriate to be used based on BSNP.The score of the students who are taught by with the module has increased in average about 82.80 (high) with a pretest score of 31.80 (low), the score of the students who are taught by using textbooks increase to 77.60 (middle) with a pretest score of 32.40 (low). Keywords: Module, Colloid, Project based learning
Leony Sanga Lamsari Purba, Nelius Harefa, Sali Afridika, Dera Savera
Jurnal Pendidikan Kimia, Volume 13, pp 69-77; https://doi.org/10.24114/jpkim.v13i1.24146

Abstract:
This research is a quantitative study which aims to determine the results differences of the 2nd National Chemistry Olympiad at the public and private senior high school using quizizz media. All participants of the population were sampled in the determination, the sampling technique used was saturated samples. The results of the prerequisite test on the data from this study showed that the data were normally and homogeneous. For normality and homogeneity tests, obtained sig > 0.05. Data analysis using SPSS 24, carried out One Way Anova test, obtained sig.0.01 with a significance level of 5%, these results indicate that there are differences in the results of the 2nd National Chemistry Olympiad (OKN) level is low, the public high school participants results with an average score of 59.48 and private high schools with an average score of 41.95 by utilizing Quizizz media. Keywords: Chemistry, Olympics, Learning, Quizizz
Micha Mahardika, Fauzan Amin, Ika Agustia Umami, Boima Situmeang, Agus Malik Ibrahim
Jurnal Pendidikan Kimia, Volume 13, pp 1-9; https://doi.org/10.24114/jpkim.v13i1.24138

Abstract:
Drug delivery system is a system that describes the journey of a drug to its target location. The main component of the drug delivery system is gelatin. The leaves of grass jelly-seaweed are needed as a raw material for gelatin. The main component of gelling agents in grass jelly leaves and seaweed is a low-methoxy pectin polysaccharide. Pectin from previous study is used as a synthesis material for hard capsule shells with the addition of other ingredients, which are Na-CMC, sorbitol, and water. The characterization results of capsule shells with variations in the composition of grass jelly-seaweed leaves 0: 4, 1: 3, 2: 2, 3: 1, and 4: 0 (A, B, C, D and E) have a disolving time of 12 minutes 45 seconds; 15 minutes 53 seconds; 23 minutes 10 seconds; 15 minutes 35 seconds and 18 minutes 12 seconds. The swelling degree test each of 200%; 266,7%; 303.3%; 586.7% and 643.3%. Furthermore, the shells of grass jelly-seaweed leaf capsules were tested for their material performance in the cefadroxyl disolving test with variations in sampling time of 10, 20, and 30 minutes. Keywords: Cefadroxyl, Drug delivery system, Green grass jelly leaves, Non-gelatin capsules, Seaweed
Imtikhana Nur Khofifah, Mitarlis Mitarlis
Jurnal Pendidikan Kimia, Volume 13, pp 22-37; https://doi.org/10.24114/jpkim.v13i1.24141

Abstract:
This study aims to describe the feasibility of the student worksheet developed in improving critical, creative, collaborative, and communicative thinking skills of students on acid-base material by using natural product. The student worksheet developed refers to the project-based learning model, which is integrated to science, technology, engineering, and mathematics (STEM). Method of this study uses a 4-D model (define, design, develop and disseminate), which is limited only to the development stage, and limited trials are carried out to nine students at senior high school. The feasibility of student worksheet is viewed from three aspects, namely validity, practicality, and effectiveness. The validity is viewed from the results of content and construct validity. The results obtained on each criterion show that the percentage score of 92.95% and 91.15% on very good category. The student worksheet's practicality in terms of activity observation and student response for each component obtained a percentage score of 95.18% and 88.09% on very practical category. The student worksheet's effectiveness in terms of the completeness of student learning outcomes showed an increase in the average N-Gain score of 0.84 on very high category and declared effective. Thus, the feasibility of the developed student worksheet in terms of all aspects such as percentage of scores obtained ≥ 61% in the aspects of validity, practicality and N-gain ≥ 0.3 in the aspect of effectiveness. So, the developed students worksheet oriented to STEM with PjBL model on acid base matter by using natural product is feasible for use in the learning. Keywords: acid-base, PjBL, STEM, student worksheet
Agus Malik Ibrahim, Boima Situmeang, Ahmad Rifa’I, Afif Hidayatul Mustafid
Jurnal Pendidikan Kimia, Volume 13, pp 10-21; https://doi.org/10.24114/jpkim.v13i1.24140

Abstract:
This study aims to obtain a dye sensitized solar cell (DSSC) prototype and a voltaic cell prototype using the kedondong plant (Spondias dulcis Forst). Kedondong leaves as a source of chlorophyll were deliberately chosen to be in line with the use of kedondong fruit as a material for electrochemical cells, so that two research results could be obtained from the kedondong plant. This research is for the application of scientific development, increasing the added value of kedondong plant, and as support for the use of environmentally friendly energy. Research methods in general are chlorophyll extraction, citric acid isolation, chlorophyll testing, DSSC assembly, electrochemical cell assembly, and performance testing for both DSSC and electrochemical cells. The analysis results show that typical peaks appear for the functional groups in chlorophyll at certain wave numbers. Hydroxyl (-OH) groups appear in the range of 3650 - 3200 cm-1, the C=C group at 1700 - 1500 cm-1, the C-N group at 1350 - 1000 cm-1, and the C-O group at 1300 - 1000 cm-1. Quantitative testing used a UV-Vis spectrophotometer at 645 nm and 633 nm, the results obtained were chlorophyll a was 4.52 mg/L, chlorophyll b was 8.43 mg/L, and total chlorophyll was 12.95 mg/L. The DSSC prototype performance test with a size of only 2.5 cm2, can produce a minimum voltage of 30.1 mV and a maximum of 280 mV. The electrochemical test of kedondong citric acid extract showed that the value of the electric voltage ranged from 121 to 630 mV. Keywords: Kedondong, Chlorophyll, DSSC, Citric acid, Electrochemical cells
Fathia Namira, Wan Azura, Ayu Miranda, Hamidatun Nisa, , Retno Dwi Suyanti, Ayi Darmana
Published: 30 December 2020
Jurnal Pendidikan Kimia, Volume 12, pp 106-115; https://doi.org/10.24114/jpkim.v12i3.21159

Abstract:
Practical activities play an important role in science education. Through it, students develop a deeper understanding of standing theoretical concepts, skill, utilization of technology, and methods for investigation with direct manipulation of related materials. Effective use of laboratories is one of the requirements in learning chemistry, especially in experiment material. However, problems that are often encountered in learning in the laboratory are laboratory management which includes the procurement process, application process, and the maintenance process. The research method used was observation, document recording and interview with all chemistry teachers and students at Labuhan Deli Senior High School and Percut Sei Tuan Senior High School, District of Deli Serdang, Indonesia. Stages in the research of this are (1) observation based on National Education Standards, (2) observation of chemistry experiments implementation, (3) observation of constraint and problems laboratory at school, and (4) determine alternative solution. The result showed that area of chemistry laboratory has suitable with BSNP standart, but the standard of facilities and infrastructure category reference scale (PAP), showed less category results. So the settlement by researchers on this problem is to do a simple practicum that can be done in an open space or using the technology (virtual laboratory) to increase the students’ skill in industrial 4.0.
Weny J.A Musa, Suleman Duengo, Ahmad Kadir Kilo, Boima Situmeang
Published: 30 December 2020
Jurnal Pendidikan Kimia, Volume 12, pp 156-163; https://doi.org/10.24114/jpkim.v12i3.21165

Abstract:
The purpose of these study is to determine the effect of active compound from tombili seed extract as a vegetable pesticide in the prevention of soil pest in rice plants. The method of these researches is isolation to obtain pure isolates, characterization by using infrared spectrophotometer (IR) and UV-VIS spectrophotometer then following biological test. The isolates obtained were tested positive for phytochemical containing alkaloid compounds and characterized as amorphous crystals. Identification of IR spectrophotometer generate a functioning -NH wave group of the wavelengths region of 3423.4 cm-1, bend C-N at wave number 1242.1 cm-1, C-H stretch at wave number 2925.8 and 2854.5 cm-1, bend C-H at 1475 wave numbers 1540 cm-1, carbonyl group (C = O) at the 1720.4 cm-1 wave number which is probably an alkaloid compound. The UV-VIS spectrophotometer results in a maximum absorption at 209.9 nm wavelengths indicated the presence of double bonds between the C = O functional group suspected as a result of the successive electronic transitions to n-π * and n-σ *. The result of biological test showed that methanol extracts of tombili seed can be used as a vegetable pesticide in pest prevention on rice plants, the most effective concentration used in this biological test is at 0.1% concentration, with very high effectiveness in eradicating pest on rice plants.
Fauzan Amin, Micha Mahardika, Dianastya Yuniarti
Published: 30 December 2020
Jurnal Pendidikan Kimia, Volume 12, pp 151-155; https://doi.org/10.24114/jpkim.v12i3.21164

Abstract:
Iron deficiency anemia is caused by the low intake of iron from foods. The purpose of this research was to make fortified tempeh using sesame seed with a high potential utility as iron fortificant. The iron bioavailability was carried out in vitro by simulating human digestion for raw and cooked tempeh. The iron fortificant added were 0, 10, 20, 25, 30 ,40 and 50% of sesame seed to substitute 100 grams of soybeans. The results of this study showed that the highest Fe content of 0.4539 mg was obtained by replacing 50% soybean with sesame seed. But after cooking, there is a decrease in boiled for 10, 20, 30,40,50% variants and increase in fried for 0, 10, 25, 30% variants.
Esa Witri, Ngatijo Ngatijo, Muhammad Haris Effendi-Hasibuan
Published: 30 December 2020
Jurnal Pendidikan Kimia, Volume 12, pp 116-123; https://doi.org/10.24114/jpkim.v12i3.21160

Abstract:
This research is part of a research project to help improve students' argumentative skills in chemistry subjects. This research is part of the development of argumentation-based teaching materials while other studies have developed learning models, teaching materials and a collection of argumentation questions. The purpose of this research was to determine the process of developing students' e-worksheets, the feasibility of students' e-worksheets based on concept and practitioner perceptions, and the effectiveness of students' e-worksheets that were developed as teaching materials based on the Toulmin argumentation pattern. Product trials were conducted at state senior high schools 11 Jambi City. The results of the practitioner's eligibility based on the teacher's response are in the very good category and students from both groups have a correlation in the "high" category. The effectiveness test is seen from the average N-Gain score of the experimental class in the quite effective category. There is a significant difference between the experimental class and the control class which can be seen from the difference in learning outcomes of the experimental class (using students' e-LKS based on the Toulmin argumentation pattern) higher than the control class (not using e-LKS).
Herlinawati Herlinawati, Buchari Buchari, M. Bachri Amran
Published: 30 December 2020
Jurnal Pendidikan Kimia, Volume 12, pp 164-169; https://doi.org/10.24114/jpkim.v12i3.21186

Abstract:
Separation of Sb (V) and Sb (III) antimony compounds using anion exchange chromatography technique have been done. To obtain the separation of Sb (V) and Sb (III) antimony compounds which is good in this study have been studied several parameters of separation in anion exchange chromatography technique. Parameters that influence the process of separation of Sb (V) and Sb (III) antimony compounds is the concentration and pH of the mobile phase (eluent) have been evaluated. The separation of Sb (V) and Sb (III) antimony compounds is good and optimum obtained using an eluent 200 mM phosphate buffer at pH 7 with a flow rate of 1 mL/min. Based on the optimum conditions for the separation of Sb (V) and Sb (III) antimony compounds with anion exchange chromatography method has generated value the capacity factor (k ') Sb (V) and Sb (III) obtained are respectively 1.77 and 3.01. While the value of selectivity (α), Number of theoretical plates (N) and Resolution (Rs) obtained are respectively 1.70; 369.48; and 1.48.
Nelius Harefa, Marudut Sinaga, Saronom Silaban
Published: 30 December 2020
Jurnal Pendidikan Kimia, Volume 12, pp 143-150; https://doi.org/10.24114/jpkim.v12i3.21163

Abstract:
Interest in learning is a passion or a great desire for something that is closely related to personality, motivation, expression and self-concept, identification, heredity, and external factors. Interest in learning affects the cognitive, affective, and psychomotor aspects of students. In this study, analyzed and interpreted student interest in learning through media-based learning Quizizz and students' perceptions of the media. Based on the analysis and interpretation of the data, indicators of student interest in the media Quizizz increased by 0.818 in the high category, indicators of student attention increased by 0.555 in the medium category, indicators of feelings of pleasure increased by 0.684 in the medium category, and indicators of student involvement increased by 0.599 in the medium category. Also, 76.32% of students thought that Quizizz media were very interesting, 50% thought that Quizizz media were easily applied, 86.84% thought that Quizizz media accommodate students to compete fairly, and 44.74% thought that Quizizz media were practically applied. Thus, students have a good perception of the Quizziz media accompanied by increased interest in learning.
Havizhah Havizhah, Muhaimin Muhaimin, Damris Muhammad
Published: 30 December 2020
Jurnal Pendidikan Kimia, Volume 12, pp 124-135; https://doi.org/10.24114/jpkim.v12i3.21161

Abstract:
This study aims to see the effect of the cooperative learning model type of group investigation and adversity quotient of students on the mastery of chemical concepts on salt hydrolysis. This research is a quasi-experimental research with a control group posttest only design using a 2 × 3 factorial design. The research was conducted in class IX MIA SMA N 10 Batanghari with two classes. Sampling was done by total sampling. Data collection techniques are questionnaires, tests and documentation. The test instrument was used to determine the value of mastery of chemical concepts on salt hydrolysis. Meanwhile, the questionnaire instrument was used to determine the level of adversity quotient of students. Data processing used two-way ANOVA. The results showed that the cooperative learning model group Investigation type and the adversitiy quotient of the climber type students had high mastery of chemical concepts, but there was no interaction between the group investigation type learning model and the adversity quotient on the mastery of chemical concepts on salt hydrolysis due to the learning model and adversity quotient influence on mastery of chemical concepts independently. Based on the results of the study, it can be concluded: (1) there is an effect of the group investigation type cooperative learning model on the mastery of chemical concepts (2) there is an effect of students adversity quotient on chemical concept mastery (3) there is no interaction between the cooperative learning model group investigation type with students' adversity quotient on mastery of chemical concepts in salt hydrolysis.
Abdul Gani, Fkip Universitas Syiah Kuala Departemen Of Chemistry Education, Maya Paramitha Mirda, Ade Ismayani
Published: 30 December 2020
Jurnal Pendidikan Kimia, Volume 12, pp 136-142; https://doi.org/10.24114/jpkim.v12i3.21162

Abstract:
Students have different levels of knowledge that can affect learning outcomes. The implementation of learning models in the classroom can also affect student learning outcomes. This study aims to determine how the effect of the implementation of the Auditory Intellectually Repetition (AIR) learning model on redox material in class X SMAN 1 Krueng Barona Jaya. This type of research is descriptive and the approach used is a qualitative approach. This study focuses on several aspects, namely learning outcomes, activities, and students' responses. The subjects in this study were students in class X-MIA1 SMAN 1 Krueng Barona Jaya. Data collection tools used were student activity observation sheets, evaluation questions, and student response questionnaires. Data were collected using these three tools and then the percentage of the results was seen. The results of the analysis of students' learning completeness were obtained that 80% of students had completed and 20% of students did not complete. The results of observations of students 'activities were seen to have developed from the first meeting, namely 92.11% to 93.75% at the second meeting, while the results of the students' responses were obtained an average percentage of 85.56%. This shows that the implementation of the AIR learning model received a positive response from students and can be used as an effective model to use in redox material.
Jurnal Pendidikan Kimia, Volume 12, pp 62-69; https://doi.org/10.24114/jpkim.v12i2.19397

Abstract:
Bangun-bangun (Coleus amboinicus Lour.) leaves is a plant that has various types of active compounds that can be utilized in various fields of health and food. The purpose of this research is to determine the components of the active compound contained in the sample when extract with methanol by maceration method and antioxidant activity test with DPPH method using a UV-Vis spectrophotometer. The value of antioxidant activity is determined by the amount of ability to inhibit 50% concentration of free radicals from DPPH. Phytochemical screening results of methanol extract active compounds contained alkaloids, tannins, flavonoids, terpenoids and steroids, as well as phenolic & polyphenols. The test activity of methanol extract of Coleus amboinicus leaves and ascorbic acid in the amount of 38.83 and 4.18 included in the very strong category as antioxidants. The extract of Coleus amboinicus leaves has lower activity compared to ascorbic acid and has the potential to be used as a natural antioxidant in preventing and minimizing the effects of free radicals. Keywords: Coleus amboinicus Lour, Antioxidant, Methanol extract, IC50, DPPH
Rini Alfiahas, Asrial Asrial, Damris Muhammad, Universitas Jambi Departemen Of Chemistry Education
Jurnal Pendidikan Kimia, Volume 12, pp 88-94; https://doi.org/10.24114/jpkim.v12i2.19406

Abstract:
The acid and base concepts are fundamental in understanding chemistry taught at senior high schools. The chemistry concepts are generally abstract and sometimes complex. Teachers are required find ways that lead to improve their students understanding. This study aimed to look at the effect of portfolio-based learning model and self regulated learning on students creative thinking skills on acid and base teaching materials. Data of students creative thinking skills were collected with test and self-regulated learning with questionnaire. The data analysed with two-way ANOVA shows that the portfolio-based learning models and students self-regulated learning have a positive effect on the students' creative thinking skills in the material taught. However, both are independent and do not interact each others in affecting the student creative thinking skills.Keywords: Acid and base, Creative thinking skills, Portfolio based learning model, Self regulated learning
Ebiati Ebiati, Asrial Asrial, Muhammad Haris Effendi-Hasibuan, Universitas Jambi Departemen Of Chemistry Education
Jurnal Pendidikan Kimia, Volume 12, pp 79-87; https://doi.org/10.24114/jpkim.v12i2.19405

Abstract:
This research study aims to determine how the sensitivity of two-tier and three-tier tests in detecting student’s misconceptions about chemical bonding. This research is a quantitative study with a total sampling technique that is measured using three-tier multiple-choice with a modified CRI. Based on the findings, with a two-tier multiple-choice, the percentage value of the understanding category is 86.06%, misconceptions are 6.89%, and do not understand is 7.06%. Meanwhile, using a three-tier multiple-choice, the percentage value of the understanding category is 85.33%, misconception amounted to 7.61%, and did not understand 7.06%. This study concludes that three-tier multiple-choice is more sensitive than two-tier multiple-choice in detecting students' misconceptions of chemical bonding. Keywords: Chemical bonding, Misconception, Three-tier, Two-tier
Dian Indah Lestari, Muhammad Haris Effendi-Hasibuan, Damris Muhammad, Universitas Jambi Departemen Of Chemistry Education
Jurnal Pendidikan Kimia, Volume 12, pp 95-105; https://doi.org/10.24114/jpkim.v12i2.19435

Abstract:
This study aims to look at the effect of the flipped classroom approach on the guided inquiry model and student's self-efficacy on creative thinking skills on the reaction rate material. The study was conducted in class XI MIA SMA N 3 Jambi City with a 2 x 2 factorial design and the sample consisted of 2 classes chosen randomly. Data collection using test techniques, namely essay tests, includes indicators of creative thinking and non-tests, namely self-efficacy questionnaire data and field notes during the study. Analysis of the data used is 2-way ANOVA. The results showed that guided inquiry learning with the flipped classroom approach and high self-efficacy categories had high creative thinking abilities, but there is no interaction between learning models with self-efficacy towards creative thinking abilities on the reaction rate material because learning models and self-efficacy affect the results of students' creative thinking abilities independently. Based on the results of the study it can be concluded: (1) There is an influence of the flipped classroom approach on the guided inquiry model of students 'creative thinking abilities on the reaction rate material (2) There is an effect of students' self-efficacy on the ability to think creatively on the material reaction rate (3) There was no interaction between the learning model and students' self-efficacy.Keywords: Creative thinking skills, Flipped classroom, Guided inquiry, Reaction rate, Self-efficacy
Hermawan Purba, Helen Anjelina Simanjuntak, Risanti Situmorang
Jurnal Pendidikan Kimia, Volume 12, pp 70-78; https://doi.org/10.24114/jpkim.v12i2.19398

Abstract:
The purpose of this study was to determine the antimicrobial activity of rosella infusa (Hibiscus sabdariffa L.). Antimicrobial inhibition test using infusa of rosella (Hibiscus sabdariffa L.) against Staphylococcus aureus and Escherichia coli bacteria at a concentration of infusa 100%; 75%; and 50%. The concentration has highest potential antibacterial of infusa for Staphylococcus aureus is 100% witch has diameter of 13.6 mm and for Escherichia coli bacteria is 100%, its show that diameter of zone inhibitory zone is 13.3 mm. The Results of phytochemical screening show that infusa of rosella (Hibiscus sabdariffa L.) contains flavonoids, saponins, and tannins. Based on the data above show that the infusa of rosella flower has high antibacterial potential. Keywords: Hibiscus sabdariffa L., antimicrobial activity, Staphylococcus aureus, Escherichia coli
Nelius Harefa, Saronom Silaban
Jurnal Pendidikan Kimia, Volume 12, pp 52-61; https://doi.org/10.24114/jpkim.v12i2.19395

Abstract:
The metal content is one indicator of the eligibility of food consumption, including food for children. In this research, identification of Lead (Pb), Mercury (Hg), Cadmium (Cd), and Arsenic (As) metals on pentol, bakso, cilok, cireng, and cimin samples by gravimetric and iodometric methods. The identification of metals by the gravimetric method shows that the metal content in all samples is below the threshold, where the highest metal content is the lead metal in the cimin sample of 0.0439 mg/kg. The identification of metals by the iodimetry method showed that the metal content in all samples was below the threshold, where the highest metal content is the lead metal in the cimin sample of 0.0436 mg/kg. Thus, all samples are categorized as safe for consumption. Keywords: Gravimetric, Iodometric, Metals content
, Novia Fransisca Dewi Silalahi
Jurnal Pendidikan Kimia, Volume 12, pp 10-19; https://doi.org/10.24114/jpkim.v12i1.17708

Abstract:
The use of modules has an effect on students’ motivation and students’ learning outcomes. Based on the analysis of learning outcomes data using paired sample t-test SPSS 21 shows that tcount (4.872)> ttable (2.354) at significance α = 0.05, which means that there are differences in students’ learning outcomes taught using chemistry practicum e-modules and practicum modules conventional. Students’ learning outcomes by utilizing the chemistry practicum e-modules are higher than students’ learning outcomes by utilizing conventional practicum modules. 93.24% of students have very strong motivation to study in the laboratory by utilizing the chemistry practicum e-module while by utilizing conventional practicum modules by 72.98%. Meanwhile, the Pearson Correlation test is 0.613 at significance α = 0.05, which means that there is a strong relationship between learning motivation and student learning outcomes. Keywords: Chemistry; e-module; learning outcomes; motivation; practicum
Jurnal Pendidikan Kimia, Volume 12, pp 20-25; https://doi.org/10.24114/jpkim.v12i1.17709

Abstract:
Teacher performance affect the students’ learning outcomes. End of semester instructional process evaluated by teacher and students. This study aimed to analyze the effect of Pedagogic, Professional, Personality, and Social as Teacher Performance on Students’ Learning Outcome in Applied Chemistry course. The population of this study is student’s took Applied Chemistry course which academic year is: 2017/2018 and 2018/2019 in Polytechnic of Tanjungbalai. The sampling is total sampling. Research method using Partial Least Square – Structural Equation Modelling (PLS – SEM). Questionnaire evaluation in the end of semester as instrument for Teacher Performance and Student’s assessment sheet as instrument for Students’ Learning Outcome. The result showed that there is a direct effect of negative and not significant correlation between Pedagogic and Social Teacher Performance on Students’ Learning Outcome Disclosure and there is a direct effect of positive and not significant between Professional and Personality Teacher Performance on Students’ Learning Outcome Disclosure. Keywords: Teacher performance; Learning outcomes; Applied chemistry; PLS – SEM
Jurnal Pendidikan Kimia, Volume 12, pp 1-9; https://doi.org/10.24114/jpkim.v12i1.17707

Abstract:
The aim of this research was to investigate the possible reaction mechanism steps in the formation of acetal from 2-chlorobenzaldehyde substrate. Asetal is a chemical compound that attracts the attention of the researchers because it has advantage in various fields of life. This study was conducted using Hyperchem software (OS Window’s) with the ab initio method using a 6-31G* basis set. In this study, the 3-21G basis set was also used as a comparison. The calculations were performed for each steps of the reaction mechanism including the substrate, the formation of hemiacetal intermediate, and the formation of acetal products. Based on the results of computational calculations, the acetalization of 2-chlorobenzaldehyde reaction can occur in the presence of an HCl catalyst. The HCl catalyst serves as an acid catalyst where hydrogen ions will be protonated by the substrate and hemiacetal. Hemiacetal compounds based on calculations have the highest formation energy compared to the benzaldehyde substrate and acetal products. This is because hemiacetal has a low stability and is easily transformed into other compounds. Keywords: Ab initio; 2-chlorobenzaldehyde; acetal
Leony Sanga Lamsari Purba
Jurnal Pendidikan Kimia, Volume 12, pp 34-43; https://doi.org/10.24114/jpkim.v12i1.17714

Abstract:
The purpose of this study was to work out the effect of the employment of chemistry learning modules based of colligative nature of the answer to boost of scholars independent learning attitudes. Population of this study was senior high school School PSKD 7 Depok by purposive sampling tecnique which was class XII with thirty students. Design of this study is one group pre non tes post non test group experiment. Data collection tecniques with questionnaries of 20 statement items and likert scale option. In processing data used the SPSS programs. The results of t paired test concluded that value of t count is bigger than the worth of t Table (-18.83> -23.80). Furthermore, it's also known that the importance value or post-nontest probability value (p-value) of 0,000 is smaller than 0.05 (0.000<0.05). It means there is effect of the use of chemistry learning modules based of colligative nature of the solution to improve of students independent learning attitudes. Based on the gain test to increase of students independent learning attitudes is in the high category, namely 0.82. Thus Guided Inquiri Based Chemistry Teaching Module are needed in learning nature of colligative solution. Keywords: Module; guided inquiri; learning
, Elferida Sormin
Jurnal Pendidikan Kimia, Volume 12, pp 26-33; https://doi.org/10.24114/jpkim.v12i1.17710

Abstract:
This research was conducted by applying a flipbook maker to improve student chemistry learning outcomes on the subject of hydrocarbons. The aims of this study was to determine the effectiveness of the use of flipbook maker to improving student chemistry learning outcomes. The use of this flipbook can increase students interest in learning chemistry which also affects the increase in students chemistry learning outcomes. The population in this research were all students of XI senior high school (SHS) Darussalam Tangerang. The sample of the study was students of XI MIA 1 consisting of 32 students. The sample was selected by the purposive sampling techniqe. The instrument used was multiple choice questions consisting of 20 items. Based on the pre requisite test, the data obtained were normally distributed with sig = 0.094 > 0.05 and homogeneous with sig = 0.014 > 0.05. Hypothesis testing is done using one sample t-test with significance level of 0.05 using the SPSS. From the research results obatined tcount (15.346) > ttable (1.670) and significant value of 0.000 < 0.05. Based on this, it can be concluded that use flipbook makers is effective to improving student chemistry learning outcomes. Keywords: Chemistry; flipbook-maker; hydrocarbon; learning outcomes
Gusti Rahman, Rizki Fitriani Nasution, Alfi Rizkina Lubis, Putri Novira, Lusyana Rahman, Ester Hartina Ria Sinaga, Puan Ibna Maghfirah Thaharah, Sri Nur Afrida, Retno Dwi Suyanti, Ayi Darmana, et al.
Jurnal Pendidikan Kimia, Volume 12, pp 44-51; https://doi.org/10.24114/jpkim.v12i1.17744

Abstract:
The laboratory is a place to train students' skills in conducting demonstration, experimental and scientific development practices. The provision of complete laboratory tools and materials and good laboratory management will make learning chemistry run optimally, but some high schools still do not meet the standards of facilities and infrastructure in the laboratory. Therefore, the researcher tries to collect the problems and constraints in the implementation of the practicum and find alternative solutions to the problem solving based on literature review and expert opinion. This research is a qualitative study which is a case study research in several high schools in Medan. The instruments in this study were student questionnaire, teacher questionnaire, principal questionnaire and observation sheet using Likert scale analyzed using the percentage formula. the results of the analysis of case studies conducted in a number of high schools in Medan, it can be concluded that, the area of chemistry laboratories in several schools in Medan meets BSNP standards, but there are still science laboratories used for chemical laboratories. The results of the analysis of equipment and materials that support the implementation of the practicum after the presentation of X1 schools 76.36%, X2 schools 65.67% and X3 schools 87.27%. Keywords: Chemistry laboratory; Practicum; Equipment
Gulmah Sugiharti, Abdul Hamid, Mukhtar Mukhtar
Jurnal Pendidikan Kimia, Volume 11, pp 79-86; https://doi.org/10.24114/jpkim.v11i3.15734

Abstract:
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
, Martin Simamora, Wesly Hutabarat
Jurnal Pendidikan Kimia, Volume 11, pp 67-78; https://doi.org/10.24114/jpkim.v11i3.15733

Abstract:
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
, Marini Damanik, Agus Kembaren
Jurnal Pendidikan Kimia, Volume 11, pp 100-106; https://doi.org/10.24114/jpkim.v11i3.15738

Abstract:
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
Fauzan Amin, Micha Mahardika, Nada Morisca
Jurnal Pendidikan Kimia, Volume 11, pp 95-99; https://doi.org/10.24114/jpkim.v11i3.15737

Abstract:
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
Boy Chandra Sitanggang, Akademi Komunitas Industri Manufaktur Bantaeng Program Studi Analisis Kimia, Eddyanto Eddyanto
Jurnal Pendidikan Kimia, Volume 11, pp 87-94; https://doi.org/10.24114/jpkim.v11i3.15736

Abstract:
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
Jurnal Pendidikan Kimia, Volume 11, pp 107-115; https://doi.org/10.24114/jpkim.v11i3.15739

Abstract:
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
Christin Vera Natalia Ginting, Jumaida Sari Nasution, Malik Alfatah Sembiring, Murniaty Simorangkir
Jurnal Pendidikan Kimia, Volume 11, pp 116-121; https://doi.org/10.24114/jpkim.v11i3.15773

Abstract:
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
Saronom Silaban, Murniaty Simorangkir, Shabarni Gaffar, Iman Permana Maksum, Toto Subroto
Jurnal Pendidikan Kimia, Volume 11, pp 122-128; https://doi.org/10.24114/jpkim.v11i3.15779

Abstract:
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
Aliyah Fahmi, Hamelasari Sitompul
Jurnal Pendidikan Kimia, Volume 11, pp 31-36; https://doi.org/10.24114/jpkim.v11i2.14460

Abstract:
The research with titled "Antioxidant activity test of ethyl acetate total extract from Batak leeks (Allium. chinense G. Don)" had been done. For the antioxidant activity test using UV Visible Spectrophotometer with 2,2-diphenyl-1-picrylhydrazyl (DPPH) as a scavenging agent obtained IC50 ethyl acetate extract total batak leeks amounted to 52.39% mg / L which stated that the extract was strong antioxidant.Keywords:Activities; antioxidants; Batak leeks
Intan Pratiwi, Postgraduate Masters In Chemical Education, Ismanisa Ismanisa, Asep Wahyu Nugraha
Jurnal Pendidikan Kimia, Volume 11, pp 49-56; https://doi.org/10.24114/jpkim.v11i2.14462

Abstract:
This study aims to find out the guided inquiry-based acid-base module that have been developed meets the criteria of the National Education Standards Agency (BSNP); learning outcomes increase after being taught using guided inquiry based modules; there is a relationship between student learning outcomes with student metacognition skills. The population was all students of class XI Senior High School Education Foundation Mulia Medan Academic. Class XI Science was chosen as the sample determined by simple random sampling. The research method used is the development research using the ADDIE model (Analysis, Design, Development, Implementation, and Evaluation). The research instrument was a learning outcome test, a metacognitive questionnaire taken from the Metacognitive Awareness Inventory (MAI) instrument, and a validation sheets. Data analysis was conducted using descriptive analysis, feasibility analysis, the results of the metacognitive questionnaire, and the results of learning tests. The hypothesis test using the t-test and assisted with the SPSS 19.0. The results of the study showed that the modules were developed according to the criteria of the National Education Standards Agency (BSNP)obtained: content = 3.85; language = 3.89; presentation = 3.83; graphic = 3.87 with valid criteria;tcount is greater than ttable (8.321> 1.708) shows that student chemistry learning outcomes increase after being taught using guided inquiry-based modules; the results of the correlation obtained rcount>rtable(0.472 > 0.388) showed that there is a relationship between metacognition skills and chemistry learning outcomes of students.Keywords:Development research; learning outcomes;guided inquiry; metacognition skills; module
, Elferida Sormin, , Sumiyati Sumiyati
Jurnal Pendidikan Kimia, Volume 11, pp 57-66; https://doi.org/10.24114/jpkim.v11i2.14463

Abstract:
Qualitative descriptive study quasi-experimental method is intended to determine the effectiveness of using online games Kahoot! to increase student motivation to learn chemistry. The population in this study were all students of class X private secondary schools (SMAs) Pusaka 1 Jakarta. The sample was selected by random sampling technique, the entire class X MIA 1 with the number of 40 students. The results showed the use of online games Kahoot! effective to increase student motivation to learn chemistry. Increased motivation to learn by using the test gain with the gain of 0.73 with the interpretation of the increase motivation to learn the high category. All the indicators of motivation to learn, which has the intention to succeed in learning, to feel the need to be learned, have ideals, appreciate the lessons and study give a percentage increase motivation to learn different. The most significant increase occurred in the indicator have a desire to succeed in learning, with high gain values, namely 0.82. The lowest increase occurred in the indicator value learning, the value of the gain medium, which is 0.70. Thus, the use of online games Kahoot! help improve students' motivation to learn chemistry when applied to learning. Kahoot! use of online games! help improve students' motivation to learn chemistry when applied to learning. Kahoot! use of online games! help improve students' motivation to learn chemistry when applied to learning.Keywords:Chemical; industry 4.0; kahoot!; learning; media; motivation
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