Articles
<![CDATA[Secondary Metabolite Phytochemical Screening Of Toba Frankincense Leaves (Styrax Paranelonerum Perk) ]]>
<![CDATA[Ruth Natalia Manurung]]>;
<![CDATA[Marham Sitorus]]>
<![CDATA[ Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 1 (2022): JANUARI 2022 ]]>
Publisher : <![CDATA[Universitas Negeri Medan ]]>
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DOI: 10.24114/ijcst.v5i1.33140
<![CDATA[Toba frankincense plant (Styrax Paralleloneurum PERK) is a native Indonesian plant originating from the west coast of Sumatra, grows naturally and has been widely cultivated. This study aims to identify what secondary metabolites are contained in Toba incense leaves (Styrax Paralleloneurum PERK).]]>
<![CDATA[Restructuration Fatty Acid Oil Castor Being Cocoa Butter Substitute Through Dehydration Reaction Castor Oil And This Interesterification With Coconut Oil ]]>
<![CDATA[Ribka J Sirait]]>;
<![CDATA[Marham Sitorus]]>
<![CDATA[ Indonesian Journal of Chemical Science and Technology (IJCST) Vol 4, No 1 (2021): JANUARY 2021 ]]>
Publisher : <![CDATA[Universitas Negeri Medan ]]>
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DOI: 10.24114/ijcst.v4i1.23088
<![CDATA[The purpose of this research to restructuring its acid fatty oils castor result of dehydration with coconut oil through the process interesterification to produce cocoa butter substitute (CBS). Coconut oil is obtained from coconut milk by heating it slowly over low heat. The resulting coconut oil has a FFA is 1.667%, a peroxide is 10.229 MekO2 / Kg and an iodine is 7,7080 gI2/100g, which meets the second quality standard according to SNI 01-3741-2002. The restructuring was carried out by interesterification of dehydrated castor oil with coconut oil with a ratio (50:50); (60:40); (70:30); (80:20) dan(90:10)with a NaOCH3 catalyst. The results showed that the interesterification of dehydrated castor oil with coconut oil with a ratio (50:50) was the most optimal ratio with a melting point of 33 oC which corresponds to cocoa oil (32 oC-35 oC) and contain omega-6 fats (linoleic acid).]]>
<![CDATA[Pengembangan E-Modul Kimia Berbasis Proyek pada Materi Larutan Elektrolit dan Non Elektrolit ]]>
<![CDATA[Indah Sari Sihombing]]>;
<![CDATA[Marham Sitorus]]>
<![CDATA[ Educenter : Jurnal Ilmiah Pendidikan Vol. 1 No. 4 (2022): Educenter : Jurnal Ilmiah Pendidikan ]]>
Publisher : <![CDATA[ARKA INSTITUTE ]]>
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DOI: 10.55904/educenter.v1i4.89
<![CDATA[This study aims to (1) to determine the results of the analysis of chemistry teaching materials on electrolyte and non-electrolyte solution materials used in schools according to BSNP standards, (2) to develop e-modules for electrolyte and non-electrolyte solution materials according to the BSNP eligibility criteria and have been based on projects, and (3) To determine student learning outcomes after being given project-based e-modules. The population in this study were all students of class X MIA SMA Negeri 1 Deli Tua, totaling 6 classes. The sample in this study was class X MIA 5 who was taught with a project-based chemistry e-module. The instrument used is an e-module feasibility questionnaire according to the BSNP standard, a learning outcome test of 20 questions that have been tested valid. This study uses the method and media development (R&D) with the ADDIE model. The ADDIE model has several stages, namely Analysis, Design, Develop, Implementation, and Evaluation. Where the results of the feasibility analysis of the content feasibility aspect of the e-module are 3.82; language eligibility is 3.83; The feasibility of presenting 3.81 and the feasibility of graphics 3.77 means that the teaching materials from the trial are very valid based on the BSNP. The average student learning outcomes who are taught project-based e-modules in one class are 78.8095. The results of the right-hand t-test with t count = 4.147> t table = 2.086. Thus the criteria for testing the hypothesis t count > t table are met. This means that Ho is rejected, Ha is accepted, so it can be concludedthat the project based chemistry learning e-module developed is better in improving students' chemistry learning outcomes in electrolyte and non-electrolyte solution materials.]]>
<![CDATA[Pengaruh Penggunaan Media Webblog Berbasis HOTS Terhadap Motivasi dan Hasil Belajar Pada Materi Laju Reaksi ]]>
<![CDATA[Bernika Evelyn Sibarani]]>;
<![CDATA[Marham Sitorus]]>
<![CDATA[ Jurnal Inovasi Pembelajaran Kimia (Journal Of Innovation in Chemistry Education) Vol 3, No 2 (2021): OKTOBER 2021 ]]>
Publisher : <![CDATA[Universitas Negeri Medan ]]>
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DOI: 10.24114/jipk.v3i2.22810
<![CDATA[This reseach goals to determine how the effect of knowing the effect of using Webblog media on the HOTS Evaluation Based Problem Based Learning Model on Motivation and Student Learning Outcomes in the Material of Reaction Rate. The research method used was an experiment that was modified as needed. The sampling technique used is by using a purposive technique where class XI IPA 4 as an experimental class is taught using Webblog Media in the Problem Based Learning model using and XI IPA 5 as a control class that is taught using Power Point Media in the Problem Based Learning learning model based on HOTS evaluation . The analysis technique used is the mean difference test, the percent increase in learning outcomes, normality test, homogeneity test and hypothesis testing. The results obtained by the average value of the experimental and control classes in the pretest data were 36.25 and 27.25. The post-test scores for the experimental and control classes were 79 and 65.5. Data on the normality and homogeneity test obtained data were normally distributed and the data were homogeneous. The correlation test for the effect of using Webblog media in the Problem Based Learning model on student motivation and learning outcomes is the value of rxy = 0.754 which means there is a positive correlation between motivation and student learning outcomes.]]>
<![CDATA[Development of Integrated Natural Science Practicum Guide Integrated Inquiry Approach to Improve Student Learning Outcomes ]]>
<![CDATA[Rezki Maya Ananda]]>;
<![CDATA[Marham Sitorus]]>;
<![CDATA[Ramlan Silaban]]>
<![CDATA[ Budapest International Research and Critics in Linguistics and Education (BirLE) Journal Vol 4, No 1 (2021): Budapest International Research and Critics in Linguistics and Education, Februa ]]>
Publisher : <![CDATA[BIRCU ]]>
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DOI: 10.33258/birle.v4i1.1606
<![CDATA[This study aims to obtain a practicum guide for Integrated Natural Sciences in SMP integrated with guided inquiry approach. This research is a research and development research and experiment. The population in this study were all students of class VIII SMP Negeri 2 Padangsidimpuan. The instrument used was a feasibility questionnaire based on the National Education Standards Agency, a feasibility questionnaire based on conformity with the guided inquiry learning model, cognitive test instruments, critical thinking skills test instruments, and skills observation sheets. The research data were analyzed using independent sample T-test and correlation test with SPSS 21 for windows at a significance of 0.05 with tcount> ttable and rcount> rtable. The results showed that: the Integrated Natural Science book in schools still has shortcomings so that it needs to be developed, the practicum manual that has been developed in Integrated Natural Science learning class VIII semester I is feasible based on the National Education Standards Agency and is in accordance with the model Guided inquiry learning, students' skills are more developed than students using Integrated Natural Science books in schools, student learning outcomes are better than student learning outcomes using Integrated Natural Science books in schools, thinking ability level The critical thinking ability of students is higher than the critical thinking skills of students using the Integrated Natural Science book in schools, there is a significant relationship between skills and the improvement of student learning outcomes and there is a significant relationship between the level of critical thinking skills of students with an increase in student learning outcomes.]]>
<![CDATA[The development of teaching materials oriented to critical thinking skills for chemistry class XI high school ]]>
<![CDATA[Risma Siahaan]]>;
<![CDATA[Marham Sitorus]]>;
<![CDATA[Saronom Silaban]]>
<![CDATA[ Jurnal Pendidikan Kimia (JPKim) Vol 13, No 1 (2021): April ]]>
Publisher : <![CDATA[Pascasarjana Universitas Negeri Medan ]]>
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DOI: 10.24114/jpkim.v13i1.24145
<![CDATA[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 thinking skills, Chemical equilibrium, 3D models]]>
<![CDATA[Differences of Student's Learning Outcomes on Redox Reaction Materials Using Cooperative Learning Model Type of Team Games Tournament Based on Question Card and Snakes and Standards Media ]]>
<![CDATA[Ester Hartina Ria Sinaga]]>;
<![CDATA[Manihar Situmorang]]>;
<![CDATA[Marham Sitorus]]>
<![CDATA[ Duconomics Sci-meet (Education & Economics Science Meet) Vol 1 (2021): Merdeka Belajar dan Tantangan Ekonomi dalam Menyongsong Era Society 5.0 ]]>
Publisher : <![CDATA[Neolectura ]]>
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DOI: 10.37010/duconomics.v1.5439
<![CDATA[This study aims to determine the differences in the application of the Teams Games Tournament (TGT) cooperative model based on question cards and snakes and ladders on redox reaction material in class X SMA Negeri 14 Medan. The research sample consisted of two classes, namely the experimental class I was treated using snake ladder media and the experimental class II was treated using question card media. This research is a pretest-posttest control group design. This study uses a test instrument that has been tested and has been valid. Data on student learning outcomes were tested for normality and homogeneity, the results obtained by both samples were normally distributed and homogeneously distributed. Hypothesis testing was carried out using a two-party t-test with the results of this study at a significance level of 5% (α=0.05) indicating that t_(count ) > t (2.127 > 2.002) then Ho was rejected. This shows that there are differences in learning outcomes using cooperative learning models of the Teams Games Tournament (TGT) type based on question cards and snakes and ladders on redox material]]>
<![CDATA[Preparing of chemical bonding learning media based android using smart apps creator program ]]>
<![CDATA[Ramlan Silaban]]>;
<![CDATA[Osi Annauli Br Girsang]]>;
<![CDATA[Roselva Theresia Manalu]]>;
<![CDATA[Marham Sitorus]]>;
<![CDATA[Simson Tarigan]]>;
<![CDATA[Irving Josafat Alexander]]>
<![CDATA[ Jurnal Pendidikan Kimia (JPKIM) Vol 15, No 3 (2023): December ]]>
Publisher : <![CDATA[Pascasarjana Universitas Negeri Medan ]]>
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DOI: 10.24114/jpkim.v15i3.51492
<![CDATA[The aim of this research is to obtain Android-based chemical bond learning media using the smart apps creator program that is feasible and eligible to use. To achieve the goal, development research has been carried out which refers to the 4 D model with the stages define, design, develop and disseminate. The research was conducted at SMA Negeri 5 Medan involving teachers and students of class X MIA. The research instruments used are non-test instruments including needs analysis instruments, feasibility test instruments and student response instruments. The research results are: (1). An Android-based chemical bond learning media has been obtained using a smart apps creator program with features main view, main menu, learning material, evaluation, summary and references. (2). The Android-based chemical bond learning media obtained was deemed suitable for use in learning with a feasibility level of 85.0% with very worthy category. (3). The students give good eligibility responded (82.6%) for the Android-based chemical bond learning media obtained with meets the requirements for use as learning media.Keywords: Android based; Chemical bonding; Learning media; Smart apps creator program]]>
<![CDATA[The Effect of E-Module on Activity and Learning Outcomes on Electrolyte and Nonelectrolyte Solutions ]]>
<![CDATA[Nova Damanik]]>;
<![CDATA[Ida Duma Riris]]>;
<![CDATA[Marham Sitorus]]>;
<![CDATA[Junifa Layla Sihombing]]>;
<![CDATA[Dewi Syafriani]]>
<![CDATA[ Jurnal Inovasi Pembelajaran Kimia (Journal of Innovation in Chemistry Education) Vol 5, No 2 (2023): OCTOBER 2023 EDITION ]]>
Publisher : <![CDATA[Universitas Negeri Medan ]]>
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DOI: 10.24114/jipk.v5i2.54922
<![CDATA[This research aims to determine activities, learning outcomes and the correlation between activities and student learning outcomes taught using the Project Based Learning (PjBL) learning model assisted by e-modules for class X SMA on electrolyte and non-electrolyte solutions. The population in this study were students of class This research uses test and non-test instruments in the form of student learning activity observation sheets which have been tested and are valid. The data obtained were tested for normality and homogeneity. Based on the results of data processing that has been analyzed, there are learning outcome values tcount = 9.714 and ttable = 1.66, the activity obtained is tcount = 6.069 and ttable = 1.66. Where tcount>ttable shows that Ha is accepted and H0 is rejected, so it can be concluded that there is an influence of the Project Based Learning (PjBL) learning model assisted by e-modules for class X SMA on electrolyte and non-electrolyte solutions. The correlation test was carried out to determine the significant correlation between activities and student learning outcomes. The research results show that rcount > rtable (0.929 > 0.329) so H0 is rejected. Thus, there is a significant correlation between activities and student learning outcomes assisted by e-modules for class X SMA on electrolyte and non-electrolyte solutions.]]>
<![CDATA[The Influence of Problem Based Learning Weblog on Students Motivation and Learning Outcomes on Thermochemical ]]>
<![CDATA[Ester Muliana Marpaung]]>;
<![CDATA[Marham Sitorus]]>
<![CDATA[ Jurnal Inovasi Pembelajaran Kimia (Journal of Innovation in Chemistry Education) Vol 6, No 1 (2024): APRIL 2024 EDITION ]]>
Publisher : <![CDATA[Universitas Negeri Medan ]]>
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DOI: 10.24114/jipk.v6i1.57248
<![CDATA[This research aims to determine the influence of weblog media using the problem-based learning model on student motivation and learning outcomes on thermochemical material. This research was conducted at SMAN 1 Percut Sei Tuan in the 2023/2024 academic year. Sample determination was carried out using a purposive sampling technique. The sample consisted of 2 classes, namely class XI-Matlanko 2 as an experimental class (30 students) which was taught using Weblog media and class The instruments used are test instruments to measure learning outcomes and non-test instruments to measure learning motivation. The results of this research indicate that there is an influence of using a weblog using a problem-based learning model on student learning motivation by testing the sig hypothesis. 0.00 < α (0.05) and there is also an influence of using a weblog using the problem-based learning model on student learning motivation with hypothesis testing sig. 0.00 < α (0.05). Apart from that, there is a correlation between learning motivation and student learning outcomes who are taught using weblog media using the problem-based learning model with sig. 0.00 < α (0.05) and Pearson correlation 0.953 with the high category.]]>
