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All Journal VALENSI Cakrawala Pendidikan Jurnal Kependidikan: Penelitian Inovasi Pembelajaran JPMS (Jurnal Pendidikan Matematika dan Sains) Jurnal Penelitian Saintek Jurnal Inovasi Pendidikan Jurnal Sains Dasar Jurnal Inovasi Pendidikan IPA Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Pengabdian Masyarakat MIPA dan Pendidikan MIPA Indonesian Journal on Learning and Advanced Education (IJOLAE) Molekul: Jurnal Ilmiah Kimia Jurnal Eduscience (JES) Jurnal Paedagogy Indonesian Journal of Chemistry and Environment SAINSTECH: Jurnal Penelitian dan Pengkajian Sains dan Teknologi Jurnal Elemen Kimia Jurnal Riset Pembelajaran Kimia Jurnal Pendidikan MIPA
Endang Widjajanti Laksono FX
Universitas Negeri Yogyakarta
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Other

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PENGARUH PENAMBAHAN PEMLASTIS DIMETIL FTALAT TERHADAP KONDUKTIVITAS MEMBRAN SELULOSA ASETAT LITIUM Apriliyani Dwi Iriyanti; Endang Widjajanti,LFX Endang Widjajanti,LFX
Jurnal Elemen Kimia Vol 6, No 2 (2017): Volume 6 No 2 Tahun 2017
Publisher : Universitas Negeri Yogyakarta

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Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh dimetil ftalat terhadapnilai konduktivitas. Subjek penelitian ini adalah selulosa asetat hasil sintesis dari daunpandan laut dan objeknya adalah konduktivitas dan gugus fungsi dari membranselulosa asetat litium. Selulosa diisolasi dari daun pandan laut dan diasetilasi denganasam asetat anhidrida dengan menggunakan katalis asam sulfat pekat. Pembuatanmembran menggunakan metode casting larutan polimer dengan pen-doping-an garamlitium 35% dan penambahan pemlastis dimetil ftalat dengan komposisi 10%, 15%,20%, 25%, dan 30%. Semakin tinggi komposisi dimetil ftalat, konduktivitasmembran cenderung meningkat. Konduktivitas optimum diperoleh pada komposisidimetil ftalat 25%.
PENGARUH PENAMBAHAN PEMLASTIS DBP (DIBUTYLPHTHALATE) TERHADAP KONDUKTIVITAS MEMBRAN SELULOSA ASETAT-LITHIUM Nur Syarifah Sukarno; Endang Widjajanti,LFX Endang Widjajanti,LFX
Jurnal Elemen Kimia Vol 6, No 2 (2017): Volume 6 No 2 Tahun 2017
Publisher : Universitas Negeri Yogyakarta

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Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh pemlastisdibutylphthalate terhadap konduktivitas membran elektrolit selulosa asetat denganlithium. Subjek penelitian ini adalah selulosa asetat dari daun pandan laut, danobjeknya adalah konduktivitas. Selulosa hasil isolasi daun pandan laut diasetilasimenggunakan asam asetat anhidrida, asam asetat glasial, dan katalis H2SO4.Membran elektrolit selulosa asetat-lithium dibuat dengan metode casting larutanpolimer. Konduktivitas ditentukan menggunakan Elkahfi 100. Hasil penelitianmenunjukkan bahwa konduktivitas membran selulosa asetat-lithium optimumpada konsentrasi DBP 25% yaitu sebesar 2,42x10-2 S cm-1.
ISOTERM ADSORPSI DARI ADSORBEN NATA DE IPOMOEA PADA ADSORPSI PEWARNA DIRECT RED TEKNIS Kuntadi Kuntadi; Endang Widjajanti, LFX
Jurnal Elemen Kimia Vol 5, No 6 (2016): Volume 5,No 6 Edisi 6 Tahun 2016
Publisher : Universitas Negeri Yogyakarta

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Penelitian ini bertujuan untuk mengetahui waktu kontak adsorpsipewarna direct red teknis pada kesetimbangan dan pengaruhkonsentrasinya dan isoterm adsorpsinya oleh adsorben nata de ipomoea.Subjek dari penelitian ini adalah nata de ipomoea dan sebagai objekadalah daya adsorpsi nata de ipomoea pada adsorpsi pewarna direct redteknis. Nata de ipomoea dari air limbah pembuatan tepung ubi jalardifermentasi dengan bakteri Acetobacter xylinum. Nata dicuci denganalkohol teknis dijemur di sinar matahari untuk mendapatkan adsorbenkering dan bebas jamur. Karakterisasi nata de ipomoea menggunakanSpektrofotometer inframerah. Adsorpsi dilakukan dengan merendam natade ipomoea dalam pewarna direct red teknis dengan perbandingan 1 : 100(b/v). Adsorpsi dilakukan dengan memvariasi waktu kontak dankonsentrasi pewarna. Daya adsorpsi diperoleh dengan membandingkankonsentrasi pewarna sebelum dan sesudah adsorpsi dan konsentrasi diukurdengan alat spektronic-20. Isoterm adsorpsi ditentukan dengan memplotdata dari variasi konsentrasi terhadap persamaan isoterm Langmuir danfreundlich.Hasil penelitian menunjukan bahwa: waktu kontak setimbang adalah60 menit, peningkatan konsentrasi pewarna direct red teknis, telahmeningkatkan daya adsorpsi adsorben nata de ipomoea, sedangkan isotermadsorpsi nata de ipomoea mengikuti isoterm freundlich.
DAYA ADSORPSI ADSORBEN KULIT SALAK TERMODIFIKASI TERHADAP KROM (III) Wijayanti Wijayanti; Endang Widjajanti, LFX
Jurnal Elemen Kimia Vol 6, No 1 (2017): Volume 6 No 1 Tahun 2017
Publisher : Universitas Negeri Yogyakarta

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Abstract

Penelitian ini bertujuan untuk mengetahui daya adsorpsiadsorben kulit salak termodifikasi terhadap krom (III).Kulitsalak didelignifikasi menggunakan NaOH 0,1 M selama 12 jamkemudian dihaluskan hingga 50 mesh. Kulit salak kemudiandiaktivasi dengan perendaman di dalam HCl 1 M selama 24 jam.Karakterisasi adsorben dilakukan dengan FTIR dan SEM-EDS.Proses adsorpsi dilakukan pada variasi konsentrasi 5 mg/L, 6mg/L, 8 mg/L, 10 mg/L, 15 mg/L, 20 mg/L, 30 mg/L, 35 mg/L,dan 45 mg/L selama 90 menit. Konsentrasi krom (III) ditentukandengan SSA.`Hasil penelitian menunjukkan bahwa dayaadsorpsi asorben kulit salak termodifikasi terhadap krom (III)adalah 1,205 mg/g adsorben dengan konsentrasi awal adsorbat28,265 mg/L.
COMPARISON BETWEEN MODIFIED FREE INQUIRY AND PROBLEM SOLVING LEARNING MODELS ON SCIENTIFIC ATTITUDES AND RESULT OF LEARNING Deti Suwanti; Endang Widjajanti,LFX Endang Widjajanti,LFX
Jurnal Riset Pembelajaran Kimia Vol 5, No 2 (2016): Volume 5, No 2, Edisi 2 tahun 2016
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jrpk.v5i2.2583

Abstract

Penelitian ini bertujuan untuk mengetahui: (1) ada tidaknya perbedaan yang signifikan antara model pembelajaran Inkuiri Bebas Termodifikasi (IBT) dengan Pemecahan Masalah (PM) dalam meningkatkan sikap ilmiah dan hasil belajar peserta didik, jika pengetahuan awal dikendalikan secara statistik, (2) kualitas pembelajaran kimia yang lebih baik antara model Inkuiri Bebas Termodifikasi (IBT) dan Pemecahan Masalah (PM) dalam meningkatkan sikap ilmiah dan hasil belajar peserta didik pada materi Laju Reaksi. Penelitian ini merupakan penelitian quasi experiment dengan nonequivalent groups design. Penelitian ini didesain dengan satu faktor, dua sampel, tiga variabel, dan satu kovariat. Populasi penelitian ini adalah sebanyak empat kelas XI MIPA SMAN 1 Godean dengan jumlah 124 peserta didik. Sampel dalam penelitian ini adalah dua kelas, yaitu kelas IBT sebanyak 32 peserta didik dan kelas PM sebanyak 32 peserta didik. Pengambilan sampel menggunakan teknik random sampling. Data penelitian dianalisis dengan uji Multivariate Analysis of Covariance (MANCOVA) dan uji analisis regresi. Hasil uji MANCOVA menunjukkan bahwa F = 0,617 dan p = 0,543 artinya tidak ada perbedaan yang signifikan antara model pembelajaran Inkuiri Bebas Termodifikasi (IBT) dengan Pemecahan Masalah (PM)dalam meningkatkan sikap ilmiah dan hasil belajar peserta didik, jika pengetahuan awal dikendalikan secara statistik. Hasil penelitian ini menunjukkan bahwa model pembelajaran Inkuiri Bebas Termodifikasi (IBT) mempunyai kualitas pembelajaran yang lebih baik daripada model pembelajaran Pemecahan Masalah (PM) dalam meningkatkan sikap ilmiah dan hasil belajar peserta didik pada materi Laju Reaksi.
Academic Resilience in Chemistry during Covid-19: A Systematic Review Desfi Annisa; Hari Sutrisno; Endang Widjajanti
Jurnal Penelitian Pendidikan IPA Vol. 9 No. 11 (2023): November
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i11.4354

Abstract

The number of difficulties experienced by students in online learning during a pandemic such as lack of focus and motivation due to stress, students experience a decline and involvement in learning. Some students stated the lack of access to technology and the environment was not conducive to learning. Students who cannot overcome academic difficulties are familiar with academic resilience. This study aimed to review articles on student academic resilience during the COVID-19 pandemic in chemistry lessons. This research is systematic research using the PRISMA method. The systematic review used articles from the range 2020-2023 published in PubMed, Google Scholar, and Science Direct. A total of 4 articles on the resilience of students studying chemistry during the COVID-19 pandemic met the inclusion criteria. The results showed that journals discussing student resilience in studying chemistry during the COVID-19 pandemic were still limited. However, from this literature research, it turns out that academic resilience is considered capable of maintaining learning success in students during the COVID-19 pandemic
Academic Resilience in Chemistry during Covid-19: A Systematic Review Desfi Annisa; Hari Sutrisno; Endang Widjajanti
Jurnal Penelitian Pendidikan IPA Vol 9 No 11 (2023): November
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i11.4354

Abstract

The number of difficulties experienced by students in online learning during a pandemic such as lack of focus and motivation due to stress, students experience a decline and involvement in learning. Some students stated the lack of access to technology and the environment was not conducive to learning. Students who cannot overcome academic difficulties are familiar with academic resilience. This study aimed to review articles on student academic resilience during the COVID-19 pandemic in chemistry lessons. This research is systematic research using the PRISMA method. The systematic review used articles from the range 2020-2023 published in PubMed, Google Scholar, and Science Direct. A total of 4 articles on the resilience of students studying chemistry during the COVID-19 pandemic met the inclusion criteria. The results showed that journals discussing student resilience in studying chemistry during the COVID-19 pandemic were still limited. However, from this literature research, it turns out that academic resilience is considered capable of maintaining learning success in students during the COVID-19 pandemic
Teacher Strategies in Managing Chemistry Learning Time to Improve Student Learning Achievement Habibil Mazid; Latifah Rachmalia; Suyanta Suyanta; Endang Widjajanti
Jurnal Penelitian Pendidikan IPA Vol 9 No 11 (2023): November
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i11.5192

Abstract

The purpose of this research is to find out the teacher's strategy in managing ideal and effective chemistry learning time to improve students' learning achievement. The method used is literature research using secondary data reviewed from books, articles, and journals. The results show that chemistry learning conducted during the day has an ineffective impact on students in participating in learning, such as students not focusing, tired, sleepy, hungry, thus disrupting students' learning concentration. The hot classroom conditions during the day also make it difficult for students to accept the material taught by the teacher. Thus, morning time is considered an effective time or a good time to absorb chemistry learning materials. Students can also repeat or study the material again so that they understand better in the afternoon or evening. Thus, teachers can prepare teaching materials that have been adjusted to the time allocation so that learning is expected to run well and effectively
Evaluating Students' Academic Resilience in Chemistry Learning: Insights from a Rasch Model Analysis Desfi Annisa; Hari Sutrisno; Endang Widjajanti Laksono; Sri Novita Yanda
Indonesian Journal on Learning and Advanced Education (IJOLAE) Vol. 6, No. 3, September 2024
Publisher : Faculty of Teacher Training and Education, Universitas Muhammadiyah Surakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/ijolae.v6i3.23522

Abstract

Teaching chemistry is a complex subject that requires a certain level of knowledge and skills to understand. Students must overcome this challenge because teaching chemistry involves abstract ideas (atoms, molecules, and electrons) and principles, laws, reaction equations, and mathematical operations. Increasing academic resilience is important in enhancing students' understanding and well-being in learning. This research aimed to test the validity and reliability of students' chemistry academic resilience tests using the Rasch model. Data collection was conducted using Google Forms. Data analysis utilized the Rasch model, assisted by the Winstep application, to reveal various aspects of the assessment. Based on the research findings, a Cronbach's alpha coefficient of 0.78 indicates strong internal consistency. In addition, item reliability reached a significant value of 0.99, while person reliability of 0.78 confirmed the consistency of respondents in providing accurate answers in the assessed categories. Furthermore, the OUTFIT and INFIT MNSQ (persons) have average values of +1.02 and +1.01, respectively (the closer to 1, the better). In contrast, the INFIT and OUTFIT ZSTD values are 0.1 and 0.3, respectively (the closer to 0, the better). The most difficult question is coded ra11 with a logit score of 0.61, and the easiest is coded ra4 with a logit score of -0.05. Therefore, the student academic resilience instrument is an effective measuring tool. In the future, chemistry educators and researchers can benefit from the potential impact of this research on Indonesian education.
STUDENTS’ CHEMICAL LITERACY PROFILE ON CHEMICAL EQUILIBRIUM MATERIAL: A CASE OF CORAL REEFS TOPIC Pratama, Faiz Ilham; Rohaeti, Eli; Laksono, Endang Widjajanti
JURNAL EDUSCIENCE Vol 11, No 3 (2024): Jurnal Eduscience (JES), (Authors from Hungary, South Africa, Malaysia, and Ind
Publisher : Universitas Labuhanbatu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jes.v11i3.6451

Abstract

Nowadays, chemical literacy is something important to discuss, including the benefits of chemical literacy itself. It can be the main purpose for teachers, experts, and curriculum policymakers. Chemical literacy is necessary for students since it can be a background for them to make a decision, build their critical thinking, and creativity, and help them solve daily problems or natural phenomena based on their knowledge. This research aimed to describe the students’ chemical literacy profile on chemical equilibrium materials in coral reef topics. The research question posed in this study is "What is the profile of the chemical literacy level of high school students on the topic of chemical equilibrium on coral reefs?", then this research was designed to determine the chemical literacy profile of high school students on the topic of chemical equilibrium on coral reefs. This research explains the chemical literacy profile from each aspect, chemistry in context, chemistry as knowledge, high-order learning skills, and affective aspect. The type of research is quantitative descriptive research. The research subjects were all students in grade 11th in a senior high school in Magelang who had been taught about chemical equilibrium materials. The sample of the research was 100 students in grade 11th. The research data collection technique used was a questionnaire. The instrument used was the students’ four-option close questionnaire sheet, in which the options were SD (Strongly Disagree), D (Disagree), A (Agree), and SA (Strongly Agree). Then, the data were analyzed by ideal criteria assessment. The result showed that the students’ chemical literacy profile in chemical equilibrium materials is 61.3125%. It showed that the student’s level of chemical literacy profile in chemical equilibrium materials is in a fair category. Therefore, the learning process can be modified to better support the development of high school students' chemical literacy profiles.
Co-Authors A.K Prodjosantoso A.K Prodjosantoso Afikah, Adilah Amalia, Puspita Andi Wibowo Anjamampionona Notiavina, Andriandrainiarimanana Anna Rakhmawati APRILIANA, APRILIANA Apriliyani Dwi Iriyanti Ariefiani, Nurlaila Widyanarti Desfi Annisa Desfi Annisa Desfi Annisa, Desfi Deti Suwanti Dewi Yuanita Dewi Yuanita Dewi Yuanita Lestari Dewi Yuanita Lestari Eli Rohaeti Fajarisma Izzatul Nadia Febri Saputri Goni, Nur Abdul Habibil Mazid Hari Sutrisno Inviolata, Lusia Isana Supiah Yosephine Louise Joronavalona, Rasamimanana K.H. Sugiyarto, K.H. Kun Sri Budiasih Kuntadi Kuntadi Latifah Rachmalia M. Pranjoto Utomo Marfuatun ' Marfuatun Marfuatun Marfuatun, Marfuatun Masriat, Ester Muhsin, Lalu Busyairi Mustika, Lely Nur Syarifah Sukarno Pratama, Faiz Ilham Putri Nur Halimah Putri Utha Cahyaningrum Regina Tutik Padmaningrum Rivolino Merbas SAPUTRI, FEBRI Situmorang, Suryani S Sri Novita Yanda Sukisman Purtadi Sulistyani Sulistyani Sulistyani Sulistyani Suwardi Suwardi Suwardi Suwardi Suyanta Suyanta Syahril Taufik Tafani, Tafani Wijayanti Wijayanti Wileri Mandabi Yanda, Sri Novita