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All Journal TABULARASA Jurnal Pendidikan dan Pembelajaran Kimia (JPPK) JURNAL PENELITIAN SAINTIKA JURNAL PENGABDIAN KEPADA MASYARAKAT Jurnal Penelitian dan Pembelajaran IPA Lantanida Journal Indonesian Journal of Chemistry jurnal syntax admiration Jurnal Inovasi Pembelajaran Kimia (Journal Of Innovation in Chemistry Education) Didaktika: Jurnal Kependidikan Jurnal Teknologi Pendidikan : Jurnal Penelitian dan Pengembangan Pembelajaran Seminar Nasional Peningkatan Mutu Pendidikan Jurnal Penelitian Sains dan Pendidikan (JPSP) Reflection Journal KOLONI Duconomics Sci-meet (Education & Economics Science Meet) Chimica Didactica Acta : Journal of Chemistry and Chemistry Education Proceeding of International Conference on Multidisciplinary Research Jurnal Akademika Kimia Jurnal Pendidikan dan Pembelajaran Kimia (JPPK)
manihar Situmorang, manihar
Departemen Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Negeri Medan, Jl. Willem Iskandar, Psr V, Medan, Sumatera Utara 20221
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Pengembangan Media Virtual Laboratorium Kromatografi Gas Berbasis Proyek Dalam Membangun Keterampilan HOTS Untuk Meningkatkan Hasil Belajar Siregar, Jelita; Situmorang, Manihar
Reflection Journal Vol. 5 No. 2 (2025): Desember
Publisher : Lembaga Penelitian dan Pemberdayaan Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/rj.v5i2.3595

Abstract

Penelitian ini bertujuan mengembangkan media virtual laboratorium berbasis proyek pada pengajaran Kromatografi Gas serta menguji kelayakan, efektivitas, dan respon siswa terhadap penggunaannya. Jenis penelitian yang digunakan adalah penelitian dan pengembangan dengan model ADDIE melalui analisis kebutuhan pembelajaran, desain dan pengembangan virtual laboratorium, standarisasi, uji coba, dan evaluasi. Subjek penelitian adalah 68 mahasiswa, yaitu kelas PSKM 23A dan PSKM 23B Jurusan Kimia Universitas Negeri Medan. Instrumen penelitian mencakup rubrik HOTS, pretest-posttest, lembar validasi ahli, serta angket respon mahasiswa. Hasil validasi virtual laboratorium berbasis proyek berada pada kategori sangat baik, dengan skor (M= 3.595 ± 1,25) dari ahli materi dan media. Uji coba menunjukkan terbangunnya HOTS mahasiswa pada kategori sangat baik (M= 87,55 ± 0,121). Selain itu, hasil belajar mahasiswa meningkat dengan nilai n-gain kelas eksperimen sebesar 77,47% kategori sangat tinggi dan kelas kontrol 45,09% kategori sedang berdasarkan data pretest-posttest. Respon mahasiswa terhadap media virtual laboratorium memperoleh skor 80,61% (sangat positif). Terdapat korelasi antara keterampilan berpikir tingkat tinggi dengan peningkatan hasil belajar mahasiswa kelas eksperimen dengan rhitung 0.551 kategori korelasi cukup tinggi. Temuan ini membuktikan bahwa virtual laboratorium berbasis proyek efektif dalam membangun keterampilan berpikir tingkat tinggi dan meningkatkan hasil belajar mahasiswa, sekaligus berpotensi menjadi alternatif sumber belajar digital yang relevan dengan kebutuhan mahasiswa. Development of Virtual Media for a Project-Based Gas Chromatography Laboratory in Building HOTS Skills to Improve Learning Outcomes This study aims to develop a project-based virtual laboratory media in teaching Gas Chromatography and to test the feasibility, effectiveness, and student responses to its use. The type of research used is research and development with the ADDIE model through learning needs analysis, design and development of virtual laboratories, standardization, trials, and evaluation. The subjects of the study were 68 students, namely PSKM 23A and PSKM 23B classes of the Chemistry Department, State University of Medan. The research instruments included HOTS rubrics, pretest-posttest, expert validation sheets, and student response questionnaires. The results of the project-based virtual laboratory validation were in the very good category, with a score (M = 3.595 ± 1.25) from material and media experts. The trial showed that students' HOTS was built in the very good category (M = 87.55 ± 0.121). In addition, student learning outcomes increased with an n-gain value of 77.47% in the experimental class (very high category) and 45.09% in the control class (moderate category) based on pretest-posttest data. Student responses to the virtual laboratory media obtained a score of 80.61% (very positive). There is a correlation between high-level thinking skills and increased learning outcomes for students in the experimental class with rcount 0.551, a fairly high correlation category. This finding demonstrates that project-based virtual laboratories are effective in developing higher-order thinking skills and improving student learning outcomes, while also having the potential to become an alternative digital learning resource relevant to student needs.
Solasi Senyawa Bioaktif Golongan Flavonoid dari Getah Kemenyan Sumatra (Styrax benzoin) Elizabet Silaban; Manihar Situmorang
KOLONI Vol. 5 No. 2 (2026): JUNI 2026
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/koloni.v5i2.840

Abstract

Sumatran benzoin resin (Styrax benzoin) is a non-timber forest product with strong potential as a source of bioactive compounds, particularly flavonoids known for their antioxidant properties. However, studies on flavonoid isolation from this resin remain limited. This study aims to isolate flavonoid fractions, determine total flavonoid content of benzoin resin extract.The method involved extraction by maceration using 70% methanol, followed by isolation processes including phytochemical screening, Thin Layer Chromatography (TLC), Vacuum Liquid Chromatography (VLC), and column chromatography. Functional group identification was conducted using FTIR analysis. Total flavonoid content was determined using a spectrophotometric method with quercetin as the standard, resulting in a linear calibration curve with an R² value of 0.989. The results showed an average total flavonoid content of 6.0381 mgQE/g extract.Overall, the findings indicate that the methanol extract of benzoin resin contains a relatively high level of flavonoids. These results suggest that benzoin resin has promising potential to be developed as a natural source for health and pharmaceutical applications.
An Innovative Project-Based Active Learning Model with Scientific Literacy for Enhancing HOTS Christina Sitepu; Manihar Situmorang; Saronom Silaban
Jurnal Penelitian dan Pembelajaran IPA Vol 12, No 1 (2026): Available Online in May 2026 (Web of Science Indexed)
Publisher : Department of Science Education, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jppi.v12i1.38996

Abstract

Higher-order thinking skills (HOTS) are essential for scientific problem-solving and lifelong learning; however, General Chemistry instruction in higher education is often lecture-centered and insufficient in fostering cognitive engagement and scientific literacy. This study develops and evaluates an project-based active learning model with scientific literacy to enhance students’ HOTS. Using a mixed-methods Research and Development approach with a sequential explanatory design, the study involved needs analysis, development of scientific literacy–based mini-projects on chemical bonding and acid–base solutions, instructional design, and model implementation. Quantitative data were analyzed using SEM-PLS. The measurement model demonstrated adequate convergent and discriminant validity (AVE > 0.50) and high internal consistency. The structural model showed a strong and significant effect of project-based active learning model with scientific literacy on HOTS (path coefficient = 0.911), with high explanatory and predictive power (R² = 0.911; Q² = 0.898). Learning motivation, engagement, self-regulated learning, instructional design quality, collaboration, and lecturer facilitation significantly contributed to HOTS. Scientific literacy strengthened the effects of several learning factors on HOTS. These findings indicate that integrating scientific literacy into project-based learning is effective strategy to improving HOTS in undergraduate General Chemistry.
Development of a Virtual Laboratory with a Project for Teaching Complexometric Titration to Improve Learning Outcomes Khoirul Bariah; Manihar Situmorang
Jurnal Akademika Kimia Vol. 15 No. 1 (2026)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2026.v15.i1.pp39-45

Abstract

The teaching of complexometric titration has not yet utilized learning media that can foster student activity, so that, in terms of cognition, students' abilities remain low. Another problem was that experiments in complexometric titration were not conducted due to limited practical work time following the implementation of block learning. The purpose of this study is to develop a virtual laboratory project to teach complexometric titration and improve student learning outcomes. This research is a Research and Development study using the ADDIE model (Analysis, Design, Development, Implementation, and Evaluation). This study involved 72 students from two classes of the Chemistry Education study program in the 2023-2024 academic year. The research instruments used were a virtual laboratory feasibility questionnaire, a test, and a response questionnaire. The results showed that the virtual laboratory media had a feasibility of 87.22%, indicating it is highly feasible for use. Student learning outcomes from objective tests showed that the N-Gain in the class was 0.68, a significant increase compared to the control class's 0.55. The student response to the development of the virtual laboratory project is 87.65%, which falls in the very good category. Therefore, it can be concluded that developing a virtual laboratory with projects is highly feasible for use in complexometric titration instruction to improve student learning outcomes.
Differences in Student Learning Outcomes Using the Predict Observe Explain Model and the Learning Cycle 5E Model on Acid Base Material Arliani Panaulan Siregar; Manihar Situmorang; Anna Juniar; Gulmah Sugiharti; Rini Selly
Jurnal Pendidikan dan Pembelajaran Kimia Vol. 14 No. 1 (2025): Jurnal Pendidikan dan Pembelajaran Kimia
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Perbedaan Hasil Belajar Siswa Menggunakan Model Pembelajaran Predict Observe Explain dan Model Learning Cycle 5E pada Materi Asam Basa. Penelitian ini bertujuan untuk menguji cara-cara di mana model pembelajaran Learning Cycle 5E meningkatkan hasil belajar siswa, cara-cara di mana model pembelajaran Predict Observe Explain meningkatkan hasil belajar siswa, dan cara-cara di mana model pembelajaran Learning Cycle 5E berbeda dari model Predict Observe Explain sehubungan dengan materi asam-basa. Dua kelas yang dipilih secara acak, XI-B dan XI-C, berfungsi sebagai sampel. Ada dua kelas eksperimen, yaitu I dan II, dan penelitian ini menggunakan desain kelompok kontrol pretes-posttest. Tes pilihan ganda dengan 20 pertanyaan digunakan dalam penelitian ini. Uji hipotesis penelitian I menghasilkan t hitung (26,77) lebih besar dari t tabel (2,3451), maka H 0 ditolak. Uji hipotesis II: Jika t hitung (38,67) lebih besar dari t tabel (2,3451), maka H 0 ditolak. Uji hipotesis III: Jika t hitung (2,35) lebih besar dari t tabel (2,2921), maka H 0 ditolak. Penelitian telah menunjukkan bahwa terdapat peningkatan hasil belajar siswa dengan menggunakan model pembelajaran Learning Cycle 5E pada materi asam basa, dari nilai sebelum menggunakan model pembelajaran Learning Cycle 5E sebesar 45,29 menjadi 85,71, terdapat peningkatan hasil belajar siswa denganmenggunakan model pembelajaran Predict Observe Explain pada materi asam basa, dari nilai sebelum menggunakan model pembelajaran Predict Observe Explain sebesar 42,86 menjadi 81,71, dan terdapat perbedaan hasil belajar siswa dengan menggunakan model pembelajaran Predict Observe Explain dan model pembelajaran Learning Cycle 5E pada materi asam basa. Nilai rata-rata hasil belajar pada kelas eksperimen I sebesar 85,71, sedangkan pada kelas eksperimen II sebesar 81,71.
ANALISIS KEBUTUHAN LABORATORIUM VIRTUAL BERBASIS PROYEK SEBAGAI MEDIA BELAJAR PADA TOPIK GRAVIMETRI Julianingsih, Nia Laras; Jullianingsih, Nia Laras; Situmorang, Manihar
Lantanida Journal Vol 13 No 2 (2025): July-December 2025
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v13i2.32225

Abstract

The willingness of practicum is an important component in gravimetry learning which is procedural and involves scientific skills. The purpose of this study is to determine and evaluate UNIMED chemistry students' requirements for project-based virtual labs. This study employs a descriptive methodology that combines qualitative and quantitative techniques using gravimetry-related questionnaires and interviews. One lecturer and twenty-four chemistry study program participants who had completed analytical chemistry courses made up the study's respondents. Interview sheets, Google Forms-distributed requirements analysis questionnaires, and questionnaires examining utilized learning media were among the research tools. Descriptive data analysis was used to determine the needs of the students. The study's findings show that because gravimetry materials lack real laboratories, students require learning resources in the form of virtual laboratories as supporting media. The results of the interviews indicated that students were receptive to the creation of virtual laboratories. The needs analysis conducted through questionnaires revealed that students had a high demand for the creation of virtual laboratories, with media needs accounting for 82.50%, visualization and simulation for 85%, projects for 63.06%, and virtual laboratories for 75.17%. With a percentage of 60.66%, the findings of the examination of educational materials utilized in gravimetry instruction are classified as good.
The Development Of A Green Chemistry Oriented Virtual Laboratory With Project To Improve Learning Outcomes In Teaching Of Redox Titration. Nurul Aliyyah; Manihar Situmorang; Emitiur Malau and Mutiara Ardi
Jurnal Pendidikan dan Pembelajaran Kimia Vol. 15 No. 2 (2026): Jurnal Pendidikan dan Pembelajaran Kimia in Progress
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study aims to develop a green chemistry-oriented virtual laboratory integrated with Project-Based Learning (PjBL) and evaluate its effectiveness in improving student learning outcomes in redox titration. The study used a Research and Development (R&D) approach with the ADDIE model and a quasi-experimental two-group pretest–posttest design. The sample consisted of 72 Chemistry Education students at Universitas Negeri Medan divided into experimental and control classes. Expert validation categorized the media as highly feasible with an average BSNP score of 3.42 in content, language, presentation, and graphics. The experimental class achieved a higher posttest score (79.55 ± 5.75) than the control class (64.55 ± 13.94). The Wilcoxon Signed-Rank Test showed a significant improvement in the experimental class (Z = -4.247, p = 0.000). The experimental class also obtained a higher N-Gain score (0.61) than the control class (0.49), with a significant difference in effectiveness (p = 0.003).
Co-Authors Abil Mansyur, Abil Ade Ariyani Ajat Sudrajat Anna Juniar Arliani Panaulan Siregar Christina Sitepu Cintiya, Henni Day Dosmayhot Simaremare Eidi Sihombing Elizabet Silaban Emitiur Malau and Mutiara Ardi Ester Hartina Ria Sinaga Fonica, Arini Grace Elisabeth Damanik Gulmah Sugiharti Hamda Situmorang, Hamda Hardyanto Lumban Gaol Hendra Gunawan Parulian, Hendra Gunawan Hisar Marulitua Manurung Ijayanti Pardosi Isnaini Nurwahyuni Jamalum Purba Julianingsih, Nia Laras Jullianingsih, Nia Laras Khoirul Bariah Lamria, Melinda Lena Lara, Setia Lukman Hakim Marham Sitorus Marudut Sinaga Maya Oktora Meilin Simalango Napitupulu, Juita Febiola Nurhetty Hutapea Nurul Aliyyah Pardosi, Ijayanti Rahma Safitri Ramlan Silaban Rini Selly Rudi Purwanto S Siswanto Saputra, Agam Saronom Silaban Sibuea, Gorat Viktor Sihombing, Kawan Silalahi, Gielf Justin Salisia Silrumson Silitonga, P Maulim Simalango, Meilin Simanungkalit, Betaria Simson Tarigan Simson Tarigan Sinulingga, Kiki A. Putri Br. Siregar, Jelita Siregar, Linda Sari Situmorang, Agam Suci Pujiastuti Tarigan, Anjany Tasya Surabika Tarigan, Miska Likasina Vera Roni Setiawan winsyahputra Ritonga