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All Journal Jurnal Penelitian Pendidikan Bulletin of Chemical Reaction Engineering & Catalysis PROSIDING SEMINAR KIMIA Jurnal Zarah JITK (Jurnal Ilmu Pengetahuan dan Komputer) Indonesian Journal of Chemistry Jambura Journal of Educational Chemistry Bivalen: Chemical Studies Journal International Journal of Social Science Kresna: Jurnal Riset dan Pengabdian Masyarakat Bulletin of Chemical Reaction Engineering & Catalysis al Kimiya : Jurnal Ilmu Kimia dan Terapan
Ratna Kusumawardani, Ratna
Jurusan Pendidikan Kimia Dan Ilmu Pengetahuan Alam, Fakultas Keguruan Dan Ilmu Pendidikan, ‎Universitas Mulawarman
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Medicine & Pharmacology Public Health Social Sciences Other

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PENGARUH PENGGUNAAN DESAIN PEMBELAJARAN ELPSA DALAM MODEL PEMBELAJARAN VAK TERHADAP HASIL BELAJAR KIMIA SISWA PADA POKOK BAHASAN LARUTAN ELEKTROLIT DAN NON ELEKTROLIT Kusumawardani, Ratna; Pratiwi, Ajeng Hayu; Muflihah, Muflihah
Jurnal Penelitian Pendidikan Vol 35, No 2 (2018): Oktober 2018
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpp.v35i2.15655

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan desain pembelajaran ELPSA dalam model pembelajaran VAK terhadap hasil belajar kimia siswa pada pokok bahasan larutan elektrolit dan non elektrolit kelas X SMA Negeri 3 Samarinda. Teknik pengambilan sampel yang digunakan adalah purposive sampling sehingga diperoleh sampel penelitian yaitu siswa kelas X MIPA 1 dan X MIPA 2 dengan masing-masing kelas berjumlah 36 siswa. Kelas X MIPA 2 merupakan kelas yang menggunakan desain pembelajaran ELPSA dalam model pembelajaran VAK sedangkan kelas X MIPA 1 menggunakan model pembelajaran VAK. Hasil penelitian menunjukkan bahwa rata-rata nilai hasil belajar siswa yang menggunakan desain pembelajaran ELPSA dalam model pembelajaran VAK lebih baik daripada rata-rata hasil belajar siswa yang menggunakan model pembelajaran VAK. Rata-rata nilai hasil belajar siswa yang menggunakan desain pembelajaran ELPSA dalam model VAK adalah 81,06 dan rata-rata hasil belajar siswa yang menggunakan model pembelajaran VAK adalah 78,32. Berdasarkan hasil analisis dengan menggunakan uji t, diperoleh t hitung = 2,68 dan t tabel = 1,99 pada taraf signifikan 5%. Karena t hitung > t tabel, maka H diterima sehingga terdapat pengaruh penggunaan desain pembelajaran ELPSA dalam model pembelajaran VAK terhadap hasil belajar kimia siswa pada pokok bahasan larutan elektrolit dan non elektrolit kelas X SMA Negeri 3 Samarinda.
PENERAPAN PEMBELAJARAN IPA TERPADU DENGAN PENDEKATAN CHEMOENTREPRENEURSHIP UNTUK MENGETAHUI MINAT BERWIRAUSAHA SISWA (STUDI KASUS DI SMP MARDISISWA 1) Ratna Kusumawardani
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2014
Publisher : PROSIDING SEMINAR KIMIA

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Abstract

Ilmu Pengetahuan Alam (IPA ) pada dasarnya berkaitan dengan peristiwa alam yang dapat ditemukan dalam keh idupan sehari-hari. Diharapkan dengan belajar IPA dapat membantu mempersiapkan siswa menghadapi tantangan di masa depan. Oleh karena itu agar hasil pembelajaran IPA menjadi lebih bermakna maka perlu dikemas ke dalam suatu pendekatan yang dapat memot ivasi minat berwirausahasiswa yaitu dengan pendekatan chemoentrepreneurship. Penelitian ini bertujuan menganalisis peningkatan minat wirausaha siswa SMP dalam pembelajaran IPA Terpadu dengan pendekatan chemoentrepreneurship. Subyek dalam penelit ian ini adalah siswa kelas VIISMP Mard isiswa 1. Metode yang digunakan dalam penelitian ini adalah berupa kuesioner/angket. Angket diberikan kepada siswa sebelum dan sesudah penerapan pembelajaran IPA Terpadu dengan pendekatan chemoentrepreneurship. Data yang diperoleh dalam penelitian ini adalah data kuantitatif berupa skor angket kemudian dianalisis berdasarkan indikator minat berwirausaha sebelum maupun setelah pembelajaran. Hasil penelit ian menunjukkan bahwa minat berwirausaha siswa melalui pembelajaran IPA Terpadudengan pendekatan chemoentrepreneurship mengalami peningkatan yang signifikan. Persentase peningkatan masing-masing indikator adalah indikator kemauan keras untuk mencapai tujuan dan kebutuhan hidup 81,28%, indikator keyakinan kuat atas kekuatan sendiri 84,07%, sikap jujur dan tanggung jawab 72,25%, indikator ketahanan fisik dan mental 56,31%, indikator ketekunan dalam bekerja dan berusaha 67,16%, indikator pemikiran yang kreatif dan konstruktif 81,22%, indikator berorientasi ke masa depan 63,27%, indikator berani mengamb il resiko 72,49%. Dari hasil analisis tersebut dapat disimpulkan bahwa model pembelajaran IPA Terpadu dengan pendekatan CEP mampu meningkatkan minat berwirausaha siswa.
THE INFLUENCE OF THE IMPLEMENTATION OF PROJECT BASED LEARNING LEARNING MODEL USING CHEMOENTREPRENEURSHIP APPROACH ON THE LEARNING OUTCOME AND ENTREPRENEURSHIP INTEREST OF SMA NEGERI 1 SAMARINDA SCIENCE PROGRAM STUDENT ON COLLOIDAL SYSTEM TOPIC IN 2014/201 Ratna Kusumawardani; Rexy Anderson Tindangen
PROSIDING SEMINAR KIMIA PROCEEDING OF INTERNATIONAL CONFERENCE 2015
Publisher : PROSIDING SEMINAR KIMIA

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Abstract

This research objective was to determine the influence of the implementation of Project Based Learning (PjBL) learning model with chemoentrepreneurship approach on the learning outcome and entrepreneurship interest of SMA Negeri 1 Samarinda student on colloidal system topic. The population was all eleventh grade students of SMA Negeri 1 Samarinda science program, meanwhile the sample was the eleventh grade students of 5th Science program class. This research used one shot pretest-posttest design, which only use 1 class as sample. The influence was determined by comparing the result of pretest and posttest and analyzed by using t test method, meanwhile the learning outcome and entrepreneurship interest improvement category were analyzed by using N-gain method. The results of the implementation of Project Based Learning (PjBL) learning model with chemoentrepreneurship approach showed a significant influence on the learning outcome and entrepreneurship interest of SMA Negeri 1 Samarinda student on colloidal system topic. According to N-gain test, the students’ learning outcome on first and second meeting has improved and the improvement is on medium category, meanwhile the students’ entrepreneurship interest also improved and the improvement is on low category.
THE EFFECT OF APPLICATION OF 5E LEARNING CYCLE MODEL COMBINED NUMBERED HEAD TOGETHER (NHT) TOWARD CHEMISTRY LEARNING OUTCOMES ON THE SUBJECT OF SALT HYDROLYSIS IN XI SCIENCE STUDENTS AT SENIOR HIGH SCHOOL 1 TANAH GROGOT ACADEMIC YEAR 2014/2015 Yuni Kurnia; Usman -; Ratna Kusumawardani
PROSIDING SEMINAR KIMIA PROCEEDING OF INTERNATIONAL CONFERENCE 2015
Publisher : PROSIDING SEMINAR KIMIA

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Abstract

This study aims to determine the effect of application of 5E learning cycle modelcombined numbered head together (NHT) toward chemistry learning outcomes on the subject of salt hydrolysis in XI science students at Senior High School 1 Tanah Grogot academic year 2014/2015. The method is used in this study is experimental method. Samples were students of class XI Science 4 as an experimental class-treated with 5E learning cycle model combined numbered head together (NHT) and the students of class XI Science 3 as control class treated with direct instructional models. Obtaining the average value of 84,4 post-test experimental class and control class 73,8. Data analysis process two groups using t-test results obtained 3,24 ttest and ttable at 5% significance level of 1,67, then tcalculation> ttable. The results of this study indicate that there are. The effect of the 5E learning cycle modelcombined numbered head together (NHT) toward chemistry learning outcomes on the subject of salt hydrolysis in XI sains students at Senior High School 1 Tanah Grogot academic year 2014/2015.
Kinetic Study of Styrene Oxidation over Titania Catalyst Supported on Sulfonated Fish Bone-derived Carbon Ratna Kusumawardani; Mukhamad Nurhadi; Teguh Wirawan; Anton Prasetyo; Nabila Nur Agusti; Sin Yuan Lai; Hadi Nur
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 1 Year 2022 (March 2022)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.1.13133.194-204

Abstract

The kinetic evaluation of titania supported sulfonated fish bone-derived carbon (TiO2/SFBC) as a catalyst in styrene oxidation by aqueous hydrogen peroxide was carried out. The catalysts were prepared by carbonation of fishbone powder at varying temperatures 500, 600 and 700 °C, respectively for 2 h, followed by sulfonation with sulfuric acid (1M) for 24 h and impregnated by varied titania concentration 500, 1000 and 1500 µmol. The physical properties of catalysts were characterized using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX) and the nitrogen adsorption-desorption analysis. The catalytic activity result showed that TiO2/SFBC can be used as a potential catalyst in styrene oxidation. Worth noting that the sulfonation process has not only transformed the TiO2/FBC particulates (without sulfonation) to cuboid-shaped TiO2/SFBC (with sulfonation) but also contributed to the high selectivity of benzaldehyde. On the other hand, carbonization at different temperatures has an indistinct effect on catalytic performance due to their similar surface areas. The styrene conversion rate responded positively with the increasing amount of titania in the functionalized composites. The styrene oxidation by aqueous H2O2 unraveled the first-order reaction with the activation energy of ⁓63.5 kJ. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Carbon-containing Hydroxyapatite Obtained from Fish Bone as Low-cost Mesoporous Material for Methylene Blue Adsorption Mukhamad Nurhadi; Ratna Kusumawardani; Wirhanuddin Wirhanuddin; Rahmat Gunawan; Hadi Nur
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 3 Year 2019 (December 2019)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (858.967 KB) | DOI: 10.9767/bcrec.14.3.5365.660-671

Abstract

The carbon-containing hydroxyapatite has been synthesized using the fish bone obtained from East Kalimantan, Indonesia. The synthesis was conducted at varying calcination temperature (300-700 °C) and duration time (1-5 h). The carbon-containing hydroxyapatite were characterized by using Nitrogen adsorption-desorption, Fourier transform infrared spectroscopy, X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Thermogravimetric analysis (TGA) and Differential thermal analysis (DTA). The carbon-containing hydroxyapatite nanoparticles consisted of the mesoporous structure with a specific surface area of 159 m2.g-1 and pore size of 44 Å. The carbon-containing hydroxyapatite nanoparticles were utilized as the adsorbent for the removal of methylene blue by varying the contact time, initial dye concentration, pH, adsorbent dosage and temperature. The maximum amount of adsorption capacity was 56.49 mg.g-1. The adsorption was well fitted with the Langmuir adsorption model (R2 ~ 0.998) and the pseudo-second-order model. This indicated that the dye molecules were adsorbed on the surface-active site of carbon-containing hydroxyapatite via chemical binding, forming an adsorbate monolayer. Hence, the adsorption capability corresponds to the physical properties such as the surface area and pore volume of hydroxyapatite because the larger surface area consists of higher binding sites for the adsorption. Thermodynamic parameters, including the Gibbs free energy (ΔG), enthalpy (ΔH), and entropy (ΔS), indicated that the adsorption of methylene blue onto the carbon-containing hydroxyapatite nanoparticles was spontaneous. Thus, carbon-containing hydroxyapatite nanoparticles can be applied as a low-cost adsorbent for the treatment of industrial effluents that are contaminated with the methylene blue.  
Catalytic Performance of TiO2–Carbon Mesoporous-Derived from Fish Bones in Styrene Oxidation with Aqueous Hydrogen Peroxide as an Oxidant Mukhamad Nurhadi; Ratna Kusumawardani; Teguh Wirawan; Sumari Sumari; Sin Yuan Lai; Hadi Nur
Bulletin of Chemical Reaction Engineering & Catalysis 2021: BCREC Volume 16 Issue 1 Year 2021 (March 2021)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.16.1.9729.88-96

Abstract

The catalytic performance of titania-supported carbon mesoporous-derived from fish bones (TiO2/CFB) has been investigated in styrene oxidation with aqueous H2O2. The preparation steps of (TiO2/CFB) catalyst involved the carbonization of fish bones powder at 500 °C for 2 h. followed by impregnation of titania using titanium(IV) isopropoxide (500 µmol) precursor, and calcined at 350 °C for 3 h. The physical properties of the adsorbents were characterized using Fourier transform infrared, X-ray diffraction (XRD), Scanning electron microscopy with energy dispersive X-ray (SEM-EDX), and nitrogen adsorption-desorption studies. The catalytic test was carried out using styrene oxidation with H2O2 as an oxidant at room temperature for 24 h. Its catalytic activity was compared with Fe2O3/CFB, CuO/CFB, TiO2, and CFB catalysts. It is demonstrated that the catalytic activity of TiO2/CFB catalyst has the highest compared to Fe2O3/CFB, CuO/CFB, TiO2, and CFB catalysts in the oxidation of styrene with styrene conversion ~23% and benzaldehyde selectivity ~90%. Kinetics of TiO2/CFB catalyzed oxidation of styrene has been investigated and mechanism for oxidation of styrene has been proposed. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA   License (https://creativecommons.org/licenses/by-sa/4.0). 
Activated Bledug Kuwu’s Clay as Adsorbent Potential for Synthetic Dye Adsorption: Kinetic and Thermodynamic Studies Sri Lestari; Muflihah Muflihah; Ratna Kusumawardani; Mukhamad Nurhadi; Yuniati Mangesa; Fathur Insani Ridho; Robbiatul Adawiyah; Pristiningtyas Ambarwati; Siti Rahma; Sin Yuan Lai; Hadi Nur
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 1 Year 2022 (March 2022)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.1.12473.22-31

Abstract

Bledug Kuwu is one of the geological phenomena as a mud volcano that occurs in Kuwu, Purwodadi, Grobogan, Central Java, Indonesia. The evaluation of Bledug Kuwu’s clay as one of the adsorbents for synthetic dyes has been carried out. The preparation of the adsorbent started with washing the clay with distilled water, followed by activation with a solution of hydrochloric acid (1 M) under mechanistic stirring for overnight. The C−H and O−H groups found on the clay adsorbent could attract methylene blue by dispersion forces and hydrogen bonding. Hydrocloric acid activation process for clay can increase surface area from 49 to 70 m2.g−1, meanwhile, reducing the average crystal size from 48.3 to 43.4 nm. The dye removal capacity increased from 34 to 40 mg.g−1 in corresponding to the increase of the temperature from 30 to 50 °C. The results showed that the equilibrium adsorption capacity of activated Bledug Kuwu’s clay reached 99% in an adsorption time of 20 min. The kinetic models of methylene blue adsorption onto BKC and ABKC adsorbents follow the pseudo-second order and the adsorption process is spontaneous with free energy (ΔG) as −23.519 kJ.mol−1. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Negative Effect of Calcination to Catalytic Performance of Coal Char-loaded TiO2 Catalyst in Styrene Oxidation with Hydrogen Peroxide as Oxidant Mukhamad Nurhadi; Ratna Kusumawardani; Hadi Nur
Bulletin of Chemical Reaction Engineering & Catalysis 2018: BCREC Volume 13 Issue 1 Year 2018 (April 2018)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (726.892 KB) | DOI: 10.9767/bcrec.13.1.1171.113-118

Abstract

The research of negative effect of calcination to catalytic performance of coal char-loaded TiO2 catalyst in styrene oxidation with hydrogen peroxide as oxidant has successfully done. The effects of calcination step to catalyst properties were characterized with Fourier Transform Infra Red (FTIR), X-ray Difraction (XRD), nitrogen adsorption, Field Emission Scanning Electron Microscopy (FESEM), and Transmission electron microscopy (TEM). The catalytic performance of the catalysts has been investigated in styrene oxidation with hydrogen peroxide as oxidant. The catalytic study showed the calcination step influenced to catalytic properties and could decrease the catalytic performance of coal char-loaded TiO2 catalyst in styrene oxidation.  
Pengaruh Disiplin Belajar Terhadap Prestasi Belajar Kimia ‎Siswa Kelas X SMA Swasta di Samarinda Siti Nurjanah; Ratna Kusumawardani; Iis Intan Widiyowati
Jambura Journal of Educational Chemistry Vol 3, No 1 (2021): Februari
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jjec.v3i1.8327

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh disiplin belajar terhadap prestasi belajar ‎kimia siswa kelas X SMA Swasta di Samarinda. Jenis penelitian ini adalah analisis deskriptif. ‎Populasi dalam penelitian ini adalah seluruh siswa kelas X SMA Swasta di Samarinda. Teknik ‎pengambilan sampel dilakukan dengan cara probability sampling dengan metode cluster ‎random sampling dan diperoleh sampel sebanyak 212 siswa. Berdasarkan hasil analisis data ‎secara deskriptif diperoleh skor rata-rata disiplin belajar siswa adalah 35,38 tergolong dalam ‎kategori sedang dan prestasi belajar kimia siswa adalah 34,91 tergolong dalam kategori sedang. ‎Dari hasil analisis regresi linier sedehana Y= a + bX, maka diperoleh persamaan regresinya Y= ‎‎38,707 + 0,601X, uji hipotesis uji t diperoleh signifikansi 0,000 < 0,05 menunjukkan bahwa ‎terdapat pengaruh positif disiplin belajar terhadap prestasi belajar kimia siswa. Adapun kontribusi ‎pengaruh disiplin belajar terhadap prestasi belajar kimia sebesar 12,4%. Berdasarkan hasil ‎penelitian menunjukkan bahwa terdapat pengaruh positif atau signifikan disiplin belajar ‎terhadap prestasi belajar kimia siswa kelas X SMA Swasta di Samarinda.‎
Co-Authors A. Rismawati Abdul Majid Abdul Majid Agus Harisandi Akrajas Ali Umar Ana Fatimah Arma Ani Suryani Simbolon Anita Setiawati Anton Prasetyo Atiek Rostika Noviyanti Bayu Setiawan Darna Yunita Devi Listianingrum Devira Nur Ajizah Dini Yulia Sari Eka Parmawatika Fathur Insani Ridho Hadi Nur Hadi Nur Hadi Nur Hadi Nur Hadi Nur Hadi Nur Hadi Nur Hadi Nur Ida Ayu Putu Sri Widnyani Iis Intan Widiyowati Indah Nur Fitriana Ivan Sebastian Jumaryadi, Yuwan Maulina Maulina Mohammad Syafrullah muflihah muflihah Muhamad Hamami Nata Mukhamad Nurhadi Mukhamad Nurhadi Mukhamad Nurhadi, Mukhamad Nabila Nur Agusti Nugraha Abdullah, Indra Nurlaili, Nurlaili Pratiwi, Ajeng Hayu Pristiningtyas Ambarwati Purwanto Purwanto Putri Wulan Mayangsari Rahmat Gunawan Rexy Anderson Tindangen Ria Retnowati Ria Retnowati Rindoi, Muhammad Robbiatul Adawiyah Rony, Zahara Tussoleha Ruwirohi, Jan Everhard Samidi Samidi Serly Wahyuni Salosso Sin Yuan Lai Sin Yuan Lai Sin Yuan Lai Sin Yuan Lai Siti Nurjanah Siti Rahma Sri Lestari Sri Rahma Wati Sukemi Sukemi Sumari Sumari Tamara Claudya Susanti Teguh Wirawan Teguh Wirawan Triana Anggraini Tutik Sri Susilowati Wa Rizka Hafinah Watulingas, Maasje C. Wirhanuddin Wirhanuddin Yulianawati Yuni Kurnia Yuniati Mangesa