EduMatSains : Jurnal Pendidikan, Matematika dan Sains http://ejournal.uki.ac.id/index.php/edumatsains <p>Merupakan jurnal untuk mempublikasikan hasil karya berupa hasil penelitian, kajian teori maupun hasil review yang original dan memiliki kebaharuan sebagai sumbangan bagi ilmu pengetahuan dalam ruang lingkup pendidikan matematika, pendidikan fisika, pendidikan kimia, pendidikan biologi dan juga meliputi hasil-hasil penelitian pada bidang ilmu fisika, kimia maupun biologi.&nbsp;<br><strong>Edumatsains</strong> terbit sebanyak dua kali dalam satu tahun, yaitu bulan januari dan bulan juli. Jurnal ini diterbitkan oleh Fakultas Keguruan dan Ilmu Pendidikan Universitas Kristen Indonesia. <strong>Edumatsains</strong> telah terindeks <a href="https://scholar.google.com/citations?user=iaFnqaYAAAAJ&amp;hl=en" target="_blank" rel="noopener">Google Scholar</a>, <a href="http://garuda.ristekbrin.go.id/journal/view/9500" target="_blank" rel="noopener">Portal Garuda</a> dan<a href="http://sinta.ristekbrin.go.id/journals/detail?id=5922" target="_blank" rel="noopener"> Sinta-4</a>.</p> <div style="float: left; margin-right: 1em;">&nbsp;</div> en-US malaunyadaniaty@gmail.com (Nya Daniaty Malau, M.Si) familia.novita@gmail.com (Familia Novita Simanjuntak) Mon, 28 Jun 2021 00:00:00 +0000 OJS 3.1.2.4 http://blogs.law.harvard.edu/tech/rss 60 ANALISIS STRATEGI METAKOGNITIF SISWA DALAM MEMAHAMI DAN MENYELESAIKAN SISTEM PERSAMAAN LINEAR DUA VARIABEL DITINJAU DARI PERBEDAAN GENDER http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2304 <p>The purpose of this study was to analyze students' metacognitive strategies in understanding and solving math problems in terms of gender differences. This type of research is based on a qualitative approach with a descriptive research design. Purposive sample technique is a technique of determining the subject based on certain criteria to make it easier to obtain the desired information. Data collection techniques in this study consisted of interviews, tests, documentation and observations. The data analysis technique in this study consists of reducing data, presenting data and making conclusions. For data validity, this study used triangulation. Triangulation is done by triangulation method. Method triangulation in this research uses two methods, namely interviews and documentation. Based on the results of data analysis, it shows that four aspects of metacognitive strategies, namely the awareness aspect, cognitive aspects, planning aspects and re-checking in understanding and solving mathematical problems in the material of the two-variable linear equation system show that the metacognitive strategies of female and male students in class X SMA 8 Kupang can be said to be good in accordance with the minimum completeness criteria set at school. Even though in the awareness and evaluation aspects, it was still seen that male and female students did not use metacognitive strategies, because understanding the concept in solving story problems was still not understood about the differences in collecting known data and being asked by mathematical modeling. Overall, male and female students were able to understand and solve problems using metacognitive strategies.</p> Ryan Nizar Zulfikar, Eva Dwika Masni Copyright (c) 2021 Ryan Nizar Zulfikar; Eva Dwika Masni https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2304 Thu, 01 Jul 2021 00:00:00 +0000 POTENSI EKSTRAK DAUN BINAHONG (Anredera cordifolia (Ten.) Steenis) DAN MINYAK ATSIRI SERAI (Cymbopogon citratus (DC.) Stapf) SEBAGAI BAHAN AKTIF HAND SANITIZER SPRAY http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2474 <p>Maintaining hand hygiene is an important habit to prevent disease caused by microorganisms and viruses. Handsanitizer is one of hygiene products as antibacterial and practical use. However, the use of alcohol as its main ingredient could irritate skin. Therefore, the alternative of alcohol is urgently found to prevent this side effect in same effectiveness. in this research, Binahong (Anredera cordifolia (Ten.) Steenis leaf extract and lemongrass oil (Cymbopogon citratus (DC.) Stapf) are used to replace alcohol as the main ingredient. This study aims to know the potential antibacterial activity of binahong leaf extract, lemongrass oil and its combination against S.aureus and its effectiveness as an active ingredient in hand sanitizer spray. Binahong extraction using the maceration method. The secondary metabolites of both extracts were identified by phytochemical assay. Then, their antibacterial activity was determined using a disk diffusion test for S. aureus. The organoleptic of hand sanitizer spray was observed. The highest antibacterial activity was obtained from the combination of binahong leaf extract and lemongrass oil 100% at ratio 1:1. This combination was used to formulate the hand sanitizer spray.&nbsp; The highest inhibitory activity of hand sanitizer spray was shown in the formulation with 3% active ingredients (extracts). This product had dark yellow in colour, distinctive aroma, and liquid texture and effectively suppresses bacterial growth on the hands. According to the results, binahong leaf extract and lemongrass oil are potentially used as active ingredients for natural hand sanitizer sprays.</p> Adonia Felma Mosse, Aniek Prasetyaningsih, Dwi Adityarini Copyright (c) 2021 Adonia Felma Mosse, Dwi Adityarini https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2474 Thu, 01 Jul 2021 00:00:00 +0000 UJI EFEKTIVITAS EPIKARPIUM BUAH NANGKA (artocarpus heterophyllus lamarck.) SEBAGAI SEDIAAN KRIM TABIR SURYA UV-B http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2798 <p>Sunscreen is needed as protection against the skin from exposure to UV rays, because it will cause erythema, aging skin, blistering, and skin cancer, in skin that is not protected by sunscreen. This study aims to determine the in vitro and in vivo ability of&nbsp;epicarpium&nbsp;A.&nbsp;heterophyllus&nbsp;extract sunscreen cream preparations. This research was conducted in vitro and in vivo, beginning with the extraction process with the maceration method using 70% ethanol, identification of compounds in the extract, TLC, GC-MS, total flavonoids test, physical quality of cream preparations, SPF values ​​of extracts and creams, and in vivo sunscreen activity tests were conducted. The yield percentage produced from 450 grams of&nbsp;simplicia&nbsp;powder was 47.61%. The compounds in A.&nbsp;heterophyllus&nbsp;epicarpium&nbsp;extract are flavonoids, tannins, saponins, terpenoids, steroids, fatty acid groups, alcohol groups, and alkanes. Crude extract contains total flavonoids of 43.625&nbsp;mgQE&nbsp;/ g extract. The 75% concentration in the cream preparation had the highest SPF value of 8.173. The in vivo test used the MED (Minimal&nbsp;Erythema&nbsp;Dose) method of erythema scoring. A concentration of 75% gives the lowest MED value of 0.25. This research is expected to provide information on alternative uses of natural ingredients as the main ingredient of sunscreen so that the use of chemicals as the main ingredient will be reduced.</p> Tara Inastu Kandarp, Aniek Prasetyaningsih, Vinsa Cantya Prakasita Copyright (c) 2021 Tara Inastu Kandarp https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2798 Thu, 01 Jul 2021 00:00:00 +0000 UJI EFEKTIVITAS SALEP KULIT BATANG KAPUK RANDU (Ceiba Pentandra) SEBAGAI OBAT ANTI-INFLAMASI http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2799 <p>Inflammation is protective response of vascular tissue to various harmful stimuli that characterized by pain, redness, and swelling. Empirically, stem bark of Ceiba pentandra has various chemical compounds that nutritious for health and have potential to be used as anti-inflammatory. This research will provide information the benefit of &nbsp;C. pentandra stem bark especially as anti-inflammatory agents and it’s correlation with the compounds. Maceration method with 70% ethanol was used in extraction and the yield was 75,54%. In phytochemical test, it was identified in crude extract contained flavonoids, tannins, saponins, steroids, β-sitosterol, 1,2-benzendiol, quinic acid, and octadec-9-enoic acid. On extract and ointment products C. pentandra has antioxidants activity with IC<sub>50</sub> value of extract was 52,64 ppm and IC<sub>50</sub> value of ointment products was 117,64 ppm. This research is included RAL experimental which was carried out on male mice that divided into 5 groups: negative control (ointment base), positive control (Betametasone valerate 0,1%), and 50%, 75%, 100% of C. pentandra ointment. The ointment was applied after the mice were induced by carrageenan, measured with the parameter of skinfold thickness of mice’s back every hour for 6 hours of observation. The result showed C. pentandra stem bark ointments has anti-inflammatory effect which %PI value in the 50%, 75%, 100% were respectively 10,85%; 18,99%; 30,84%.</p> Setya Harianto, Aniek Prasetyaningsih, Vinsa Cantya Prakasita Copyright (c) 2021 Setya Harianto https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2799 Thu, 01 Jul 2021 00:00:00 +0000 BILANGAN DOMINASI LOKASI PADA LINE PAN GRAPH DAN MIDDLE PAN GRAPH http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2928 <p>Let G is a simple, connected, and undirected graph. A set D is a subset of V. If every node of&nbsp; V adjacent to at least one node D, then D is a dominating set of the graph G . One of the topics from dominating set is locating dominating set. Locating dominating set is dominating set on condition if every two vertices u,v elements of V-D satisfy the intersection of N(v) and D not equal to the intersection of N(u) and D&nbsp; with u not equal to v. The locating domination number of a graph G&nbsp; is the minimum cardinality of a locating dominating set in a graph G . In this study discussed the locating domination number on line pan graph (L(T<sub>n,1</sub>)) and middle pan graph (M(T<sub>n,1</sub>)). Locating domination number was obtained by finding dominating set from some graph. Then, does the dominating set meet the condition of locating dominating set? If it meets locating dominating set condition, then we can find the locating domination number of the graphs. In the last procedure, we get pattern location domination number of line pan graph and middle pan graph. The results of the study obtained the locating domination number of (L(T<sub>n,1</sub>)) and&nbsp; (M(T<sub>n,1</sub>)) consecutive are floor function of (2n/5)+1&nbsp; and floor function of ((2n+1)/3)+1.</p> Fransiskus Fran, Elishabet Yohana, Yundari Yundari Copyright (c) 2021 Fransiskus Fran, Yundari Yundari https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2928 Thu, 01 Jul 2021 00:00:00 +0000 POTENSI PEMANFAATAN YOUTUBE DALAM PEMBELAJARAN MATEMATIKA http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2945 <p>Information technology has a very important role in learning. YouTube is used as a teaching media to help overcome the difficulties of teaching and learning activities during the Covid-19 pandemic period. Providing sources of information in the form of materials and other additional information is very useful so students can understand the material optimally. The purpose of writing this article is to provide information so that it can be used as a source of readers about the potential for youtube utilization in mathematics learning. This research is a literature review that examines ideas, opinions, or findings contained in online articles and journals related to titles and research content so that it provides theoretical information. The results of this study concluded that the potential for youtube utilization in mathematics learning has a positive effect in increasing student learning interest and can motivate students to learn because information on YouTube is very diverse so that it will be useful in the current learning conditions.</p> Fira Nur Setiyana, Anggun Badu Kusuma Copyright (c) http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2945 Thu, 01 Jul 2021 00:00:00 +0000 PERAN POLIMER SUPER ABSORBEN PADA POPOK BAYI DALAM MENGONTROL KELEMBABAN TANAH http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2991 <p>The problem of disposable diaper waste is a serious problem that challenges the environment. Therefore, researchers are trying to use diaper waste in agriculture. Literature studies have been carried out as a form of scientific articles. The aim of this literature review are determine the absorption ability of Super Absorbent Polymers (SAP) on the effect of pH, temperature, salinity and soil moisture with the addition of Super Absorbent Polymer (SAP). This study was expected to increase knowledge about Super Absorbent Polymer (SAP) and its application related to the agricultural sector. From the results of the literature study, it was concluded that the swelling ability of the SAP reached the optimum conditions at pH 6.5 and 9, while the influence of temperature on the swelling ability of the SAP occurred at temperatures of 25<sup>o</sup>C, 50<sup>o</sup>C and 75<sup>o</sup>C. Swelling capacity conditions using saline solution showed a decrease in swelling capacity as the concentration of the salt solution increased. Soil moisture by adding super absorbent polymer showed significant results, which was 3 times higher than without SAP, i.e. moisture could last up to 18 days from the first day of watering but not for all types of plants.</p> Nurfika Ramdani, Mariaulfa Mustam, Adhyatma Prawira Harun, Husain Azis, I Made Agus Setiawan Copyright (c) 2021 Nurfika Ramdani, Mariaulfa Mustam, Adhyatma Prawira Harun, Husain Azis, I Made Agus Setiawan https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2991 Thu, 01 Jul 2021 00:00:00 +0000 KILLING FORM ALJABAR LIE FROBENIUS BERDIMENSI ≤4 UNTUK MENENTUKAN KESEMISEDERHANAANNYA http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2999 <p>We study the notion of the Killing form for Frobenius Lie algebras of dimension . The Killing form is a symmetric bilinear form on a finite dimensional Lie algebra &nbsp;over a field &nbsp;defined by &nbsp;where &nbsp;is denoted the trace and &nbsp;is an adjoint representation of .&nbsp; A Lie algebras is said to be semisimple if it has the nondegenerate Killing form. The research aims to consider the criterion for semisimplicity of Frobenius Lie algebras of dimension &nbsp;by using the Killing form. The results show that each Frobenius Lie algebra of dimension &nbsp;and&nbsp; &nbsp;is not semisimple since the the Killing form is degenerate or in other words, a determinant of a representation matrix&nbsp; of the Killing form is equal to zero. For the future research, it is still an open problem to consider the general formulas of the Killing form for higher dimensional Frobenius Lie algebra whether degenerate or nondegenerate such that the semisimplicity of a Lie algebra can be considered. We conjecture that each finite dimensional real Frobenius Lie algebra is not semisimple.&nbsp;</p> Edi Kurniadi Copyright (c) 2021 Edi Kurniadi https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2999 Thu, 01 Jul 2021 00:00:00 +0000 DAYA HAMBAT EKSTRAK CALLYSPONGIA SP. TERHADAP BAKTERI DARI Eucheuma Cottoni BERPENYAKIT Ice-Ice http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2983 <p>Callyspongia sp. is one type of sea sponge that produces secondary metabolites in the form of steroids, alkaloids, flavonoids, and terpenoids which can be used as antibacterial agents. This reseach aims to determine whether or not there is an inhibitory power of sea sponge extract Callyspongia sp. on the growth of bacterial isolates on Eucheuma cottonii seaweed that is infected by ice-ice disease. This type of research is an experimental laboratory. Extract of Callyspongia sp. is the result of Callyspongia sp. extraction which has been dried and then macerated using a polar ethanol solvent. Inhibition test with the modified Kirby-Bauer method used wells to measure the zone of inhibition formed by the extract of the Callyspongia sp. The test was carried out to observe the presence or absence of an inhibition zone of Callyspongia sp. extract against bacterial isolates (Isolates I, II and III) that is infected by seaweed that is infected by ice-ice disease after 24 hours of incubation. The results showed that an inhibition zone was formed in bacterial isolates. Treatment with extracts of Callyspongia sp. shows the diameter of the highest inhibition zone that is 16.67 mm which is classified as a strong inhibitory force, so that Callysponia sp. extract has the potential in overcoming ice-ice in Eucheuma cottonii seaweed.</p> Yosephina Payu Wao, Melania Priska Copyright (c) 2021 Yosephina Payu Wao https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2983 Thu, 01 Jul 2021 00:00:00 +0000 PENERAPAN MODEL PEMBELAJARAN KOOPERATIF GALLERY WALK UNTUK MENINGKATKAN HASIL BELAJAR BIOLOGI SISWA KELAS X SMA NEGERI 22 JAKARTA http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2796 <p>The application of a learning method will greatly affect the ability of students to understand a topic. The purpose of this study is to improve the learning outcomes of Biology of students by implementing cooperative learning model <em>Gallery walk</em>. This research was conducted at SMA Negeri 22 Jakarta in March to June 2019 using the action research method. Data collection is done through the provision of written tests to determine learning outcomes in studying ecosystems and environmental change. The data obtained were then analyzed by calculating the average value of the pretest and the average value of daily tests in cycle I and cycle II. The results showed that learning by applying <em>Gallery walk</em> cooperative learning can improve student Biology learning outcomes. Based on these results it can be concluded that <em>Gallery walk</em> cooperative learning can be used as an effort to improve Biology learning outcomes. The percentage of completeness of pre-cycle, cycle I, and cycle II respectively, namely 8.33%, 47.22%, and 88.89%. The learning outcomes of pre-cycle, cycle I, and cycle II respectively are 57, 68, and 76.</p> Sondang Rosita Indah Copyright (c) 2021 Sondang Rosita Indah https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2796 Thu, 01 Jul 2021 00:00:00 +0000 MEMBRAN Zirconia.titania UNTUK PENGOLAHAN AIR LIMBAH: KAJIAN LITERATUR http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2375 <p>The need for clean water is a necessity to sustain human life. This need will continue increasing in line with the human population growth, but it is not balanced by appropriate wastewater treatment to preserve the clean water stock. Zirconia and titania-based membrane technology is a promising technology in water and waste treatment processes because it is able to produce a good and stable quality of water against chemical reactions, high temperatures, and mechanical stress. This study aims to literature study-based analyze the capability of synthesis, characterization, and application of a membrane that combines zirconia and titania (Zr1-xTix)O<sub>2</sub> with Al<sub>2</sub>O<sub>3</sub> as a substrate for domestic wastewater treatment. The discussion describes the method of zirconia.titania membrane application to support its performance in domestic wastewater treatment.</p> Familia Novita Simanjuntak, Ngia Masta Copyright (c) 2021 Familia Novita Simanjuntak, Ngia Masta https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2375 Thu, 01 Jul 2021 00:00:00 +0000 HUBUNGAN HASIL BELAJAR DARING DENGAN MINAT DAN MOTIVASI BELAJAR MAHASISWA DI ERA PANDEMI COVID-19 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/3001 <p>&nbsp;The distance learning process is something new for students, so there needs to be an adaptation for students so that they can learn well and can absorb the material given well. Therefore, this study will analyze the percentage of interest level and motivation to learn mathematics of mathematics education study program students at Almuslim University during the Covid 19 pandemic. The method used is a case study qualitative research with a population of all students of the Almuslim University mathematics education program. Data collection techniques are using a questionnaire of student interest and learning motivation and interviews. The results obtained were that the average interest and motivation of students in taking online lectures was 66.8%. Then the average student learning outcomes during online learning was 82.36%, this indicates that the learning outcomes of the Al-Muslim University Mathematics Education Study Program students were in a good category. So it can be concluded that if the students' interest and motivation are good, it will also increase the learning outcomes obtained. The relationship between online learning and student learning interest and motivation shows a strong relationship, which is 66.1%. In addition, the relationship that the online learning process has with student interest and learning motivation shows a positive relationship, which means that if the online learning process increases better, student interest and learning motivation will also increase.</p> Wiwin Apriani, Nurhayati Copyright (c) 2021 Wiwin Apriani, Nurhayati https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/3001 Thu, 01 Jul 2021 00:00:00 +0000 ANALISIS DAN REKONSTRUKSI DESAIN KEGIATAN LABORATORIUM (DKL) MATERI SPERMATOPHYTA MELALUI PETUNJUK PRAKTIKUM http://ejournal.uki.ac.id/index.php/edumatsains/article/view/3002 <p>One of the skills needed in the 21st century is scientific literacy. However, the existing DKL as practicum support is not optimal to be able to improve students' scientific literacy. The purpose of this study was to analyze the quality of DKL on Spermatophyta material used to support practicum in schools, using laboratory activity analysis instruments covering aspects of curriculum relevance, competence, and knowledge construction. This research method is descriptive research. The sampling technique was carried out purposively, where the samples of DKL analyzed came from two DKL, namely DKL Biology class X spermatophyta material based on the 2013 Curriculum and the Education Unit Level Curriculum (KTSP). Furthermore, a trial was conducted on one of the DKL. The findings from the analysis and trials became the basis for the reconstruction of Spermatophyta DKL. The results of the research show that the existing DKL still has not developed higher-order thinking skills, and there are still few concepts formed. The results of the reconstruction of DKL through practical instructions to be more effective and representative according to the demands of the applicable KD and develop science process skills.</p> Wahyu Tri Darmawati, Bambang Suprianto, Sri Anggraini Copyright (c) 2021 Wahyu Tri Darmawati, Bambang Suprianto, Sri Anggraini https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/3002 Thu, 01 Jul 2021 00:00:00 +0000 RANCANG BANGUN AUTOMATIC HAND WASHING STATION DENGAN MENGGUNAKAN MIKROKONTROLLLER ARDUINO UNO R3 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/3020 <p>Washbasin needs to be provided in a place that is generally visited by people. It is necessary to design an automatic hand washing machine to reduce direct contact. This study aims to design and manufacture a simple automatic hand washing device, using a microcontroller and equipped with sensors to regulate the faucets and also regulate the release of the soap dish. This research has 3 stages. The first stage of planning includes the selection of actuators, sensors, and microcontrollers. Second, the manufacture of tools in the form of mechanical manufacture, electrical circuits, and programming. The final stage is testing, responding to tools that will function properly, and monitoring those that still need to be developed. Based on the research, the Automatic Hand Washing Station design tool uses a frame in the form of steel angles with holes SA75 3.75 x 3.75 with binders in the form of Hex Bolt and Nut M10, Arduino Uno R3 Microcontroller, Relay Module, Buck Converter, 2 Infrared Sensors, 5 LEDs, the actuators used are Single pump DC 12V 4.5A, servo motor 9.4 kgf.cm, reservoir with a capacity of 19 liters, and Power Adapter 12V 5A. The electronic system affects the performance of the actuator which results in the less functioning of the actuator itself. This connected obstacle is caused by the condition of the jumper cables that accumulate and also the less than the optimal output power. The programming system uses the Arduino IDE and can run well in the simulation tool process.</p> Alfian Djafar, Muhammad Gilang Kentjana, Reza Kristiyanto, Yusuf Afudin Copyright (c) 2021 alfian djafar, Muhammad Gilang Kentjana, Reza Kristiyanto, Yusuf Afudin https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/3020 Thu, 01 Jul 2021 00:00:00 +0000 ANALISA LOGAM BERAT DALAM AIR MINUM ISI ULANG (AMIU) YANG BEREDAR DI KOTA BATAM http://ejournal.uki.ac.id/index.php/edumatsains/article/view/3039 <p>The purpose of this study was to analyze and determine the levels of metal content contained in refill drinking water circulating in the city of Batam. To achieve this goal, research activities were carried out 2 times sampling at 6 refill drinking water depots in Batam City. The research was conducted at the chemical laboratory of the University of Riau Islands and analysis of metal contamination was carried out by analysts using the ICP-MS method at the Indonesian Surveyor Laboratory in Batam using the services of an analyst. The methods used in this study include descriptive methods to determine sampling techniques, and laboratory examinations. From the results obtained, it can be concluded that the levels of Cu, Cd, and Pb metals in the 6 refill drinking water depots are below the standard that has been set based on SNI and Minister of Health regulations No. 492/Menkes/Per/IV/2010. So that the refill drinking water is fit for consumption.</p> Fitrah Amelia Copyright (c) 2021 Fitrah Amelia https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/3039 Thu, 01 Jul 2021 00:00:00 +0000 ANALISIS KEMAMPUAN LITERASI SAINS PESERTA DIDIK DALAM PEMBELAJARAN KIMIA MENGGUNAKAN MULTIMEDIA INTERAKTIF BERBASIS BLENDED LEARNING http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2934 <p>This study aims to determine the effect of blended learning-based interactive multimedia on students' scientific literacy skills. This type of research is a quasi-experimental study carried out with a non-equivalent control group design. This research was conducted in one of the high schools in Lombok, Indonesia, involving a control class and an experimental group. Pre-test and post-test were given by researchers to test students' scientific literacy skills in learning chemistry with the subject matter of oxidation-reduction reactions. The validity, reliability, and level of difficulty of the questions were tested using the Rasch Model. The statistical analysis used was the prerequisite test for data analysis and hypothesis testing using the t-test (Independent samples t-test) with the help of SPSS 20 for windows. The results showed that the average N-gain score of the experimental class students' scientific literacy was 78.5 with high criteria, the experimental class N-gain average score was 67.3 with medium criteria. So it can be concluded that the scientific literacy ability of the experimental class is higher than the control class and interactive multimedia based on blended learning affects increasing students' scientific literacy skills.</p> Muhammad Shohibul Ihsan, Siti Wardatul Jannah Copyright (c) 2021 Muhammad Shohibul Ihsan, Siti Wardatul Jannah https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2934 Thu, 01 Jul 2021 00:00:00 +0000 EFEKTIVITAS PEMANFAATAN MEDIA PEMBELAJARAN TEKA-TEKI SILANG ONLINE TERHADAP PENINGKATAN MINAT BELAJAR SISWA http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2959 <p><strong>&nbsp;</strong></p> <p>This research is a quantitative research which aims to determine the effectiveness of the use of online crossword puzzle learning media in increasing student interest in learning. The population in this study were all students of SMA Widya Manggala. The sample in this study was selected using purposive sampling based on topic considerations. The research design was pre non test and post non test experimental control design. The learning interest questionnaire instrument used in this study was validated by expert validators. The results of the normality test for the Shapiro-Wilk approach show that the significance value (Sig.) Is 0.101. If associated with the normality criteria 0.101 is greater than 0.05 (0.101&gt; 0.05). This means that the research data is normally distributed and can be analyzed using parametic statistics, in this case the one-sample t test. The normality test carried out in this study is a hypothesis test using SPSS 24, the significance value (Sig.) Of 0.000 is smaller than 0.05 (0.000 &lt;0.05), so Ho is rejected and Ha is accepted. Hypothesis test results obtained that further gain test is carried out to determine how much increase in student learning outcomes. The result of the gain test is 0.336 with the medium category.</p> Desmitha Fritha Sababalat, Leony Sanga Lamsari Purba, Sormin Sormin Copyright (c) 2021 Desmitha Fritha Sababalat, Leony Sanga Lamsari Purba, Sormin Sormin https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2959 Wed, 30 Jun 2021 05:45:21 +0000 PERBANDINGAN KUALITAS BAHAN BAKAR DARI PENGOLAHAN SAMPAH PLASTIK MENJADI BAHAN BAKAR MINYAK DENGAN METODE PIROLISIS http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2998 <p>Given the existence of plastic waste in the environment is very dangerous, therefore it is necessary to conduct research to handle it. The development of technology for plastic processing to produce something useful continues to be carried out by various groups, ranging from scientists, academics, and students. One of them is the utilization of plastic waste into fuel oil (BBM) using the pyrolysis technique which will be installed to process plastic waste. The purpose of this study was to determine the fuel oil from processing plastic waste and compare the fuel with kerosene and diesel oil with the parameters of density, burning time and water temperature when heating using the three fuel oils. The research method used is data collection techniques including pre-treatment, the process to determine the density of each fuel sample, the process of burning time, temperature during heating, analysis of the density of pyrolysis oil, kerosene and diesel fuel by measuring the volume and the mass of each sample. Comparison of the quality of Fuel Burning Time, namely Oil from recycled plastics 4.01 minutes, Diesel Oil 4.45 minutes, and Kerosene 3.02 minutes. Comparison of the quality of water temperature with a volume of 20 ml of water and a heating time of 5 minutes, it is found that recycled plastic oil is 0.77oC, diesel oil is 0.73oC, kerosene is 0.84oC. plastic waste processing is under kerosene but above diesel oil based on density indicators, burning time, water temperature when heating.</p> Mariaulfa Mustam, Nurfika Ramdani, Irfan Syaputra Copyright (c) 2021 MARIAULFA MUSTAM https://creativecommons.org/licenses/by/4.0 http://ejournal.uki.ac.id/index.php/edumatsains/article/view/2998 Wed, 07 Jul 2021 01:04:28 +0000