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PENGEMBANGAN BAHAN AJAR PENDUKUNG DALAM BENTUK KOMIK UNTUK SISWA SMP KELAS VII PADA MATERI UNSUR, SENYAWA, DAN CAMPURAN Neli Nilawati; Maria Paristiowati; Darsef Darwis
Jurnal Riset Pendidikan Kimia (JRPK) Vol 3 No 1 (2013): Jurnal Riset Pendidikan Kimia (JRPK), Volume 3 Nomor 1 (2013)
Publisher : LPPM Universitas Negeri Jakarta

This study aims to generate and test the feasibility of supporting teaching materials in the form of comics for junior high school students on elements, compounds and mixture subject. The study was conducted in September 2011 - May 2012 at Junior High School 47 and 148 Jakarta. It used a method of research and development which consists of three phases, namely requirements analysis phase, the stage of product development and product testing phase. Based on the analysis of the needs of students as much as 97.14% of respondents support the development of supporting materials in the form of comics, and 82.86% of respondents expressed interest in learning science students with the comic. The results of product trials to matter experts, linguists, media experts and pilot testing of products to students and teachers in small and large scale show that the interpretation for the comic value of learning that has made presentations range 72.9% - 90% so that these materials have been both viable and can be used as support materials for teaching science to the material elements, compounds and mixtures. Keywords: Teaching Material Support, Comics Learning, Methods of Research and Development

PENGEMBANGAN LKS PRAKTIKUM PADA POKOK BAHASAN LAJU REAKSI UNTUK KELAS XI SMA/MA MELALUI PENERAPAN GREEN CHEMISTRY (DI SMAN 31 JAKARTA) Ade Irma Hifzhiah; Suwirman Nuryadin; Darsef Darwis
Jurnal Riset Pendidikan Kimia (JRPK) Vol 3 No 1 (2013): Jurnal Riset Pendidikan Kimia (JRPK), Volume 3 Nomor 1 (2013)
Publisher : LPPM Universitas Negeri Jakarta

This research has intended to develop Student Work Sheet for lab activities in XI senior high school of reaction rate subject by green chemistry applied. This research was done on February until June 2012 at JHS 31 Jakarta and Chemistry Department, Mathematics and Natural Science Faculty, Universitas Negeri Jakarta. This research used by Research and Development (R n D) method with qualitative description approach. The method consists by three parts, there are: Preliminary Study is (literature study and observed) Next, Development Phase has for evaluated and revised about trial product w Last, Experiment Phase is for knowing judgmentâ€™s student about product . Based on the final testing, it has a conclusion that Student Work Sheet has acceptable for guiding students in lab activities by contained a few of aspects , there are: content, language, presented, and green chemistry concept. Keywords: Student Work Sheet, Lab Activities, Green Chemistry, R n D method

PENGARUH PENERAPAN PENALARAN BERBASIS KONSEP MELALUI STRATEGI PEMBELAJARAN PROCESS ORIENTED GUIDED INQUIRY LEARNING (POGIL) TERHADAP PRESTASI BELAJAR SISWA PADA MATERI REDOKS Betania Ratna Sari; Suhartono Suhartono; Darsef Darwis
Jurnal Riset Pendidikan Kimia (JRPK) Vol 7 No 1 (2017): Jurnal Riset Pendidikan Kimia (JRPK), Volume 7 Nomor 1 (2017)
Publisher : LPPM Universitas Negeri Jakarta

This study aims to determine the effect of concept-based reasoning through learning strategy Process Oriented Guided Inquiry Learning (POGIL) to student achievement on the redox subject. This type of research is a quasi-experimental research with a Non-equivalent Control Group Design. The sampling used purposive sampling technique, which obtained by two classes, one as control class using Guided Inquiry Learning (GIL) and the other as experiment class using Process Oriented Guided Inquiry Learning (POGIL). Generated data during the study was analyzed by using descriptive and inferential statistical analysis of t-test. The average posttest grade of the control class is 66.91 while in the experimental class is 71.30. The results showed that there was a difference of chemistry learning achievement in control class and experiment class with tcount = 3.0810; ttable = 1.668 (tcount> ttable). The existence of these differences indicates that the application of concept-based reasoning through Process Oriented Guided Inquiry Learning (POGIL) strategy has a positive effect to students learning achievement on the redox subject. Keywords: POGIL Learning, Learning Achievement, Redox

Pengaruh Model Pembelajaran Guided Discovery Learning Terhadap Literasi Kimia Peserta Didik Pada Materi Larutan Penyangga Darsef Darwis; Nur Azmi Permatasari; Muktiningsih Nurjayadi
Jurnal Riset Pendidikan Kimia (JRPK) Vol 9 No 2 (2019): Jurnal Riset Pendidikan Kimia (JRPK), Volume 9 Nomor 2 (2019)
Publisher : LPPM Universitas Negeri Jakarta

The purpose of this research was to know the effect of guided discovery learning models on students' chemical literacy in the buffer solution material. This research was conducted at SMAN 53 Jakarta in the even semester of the 2018/2019 academic year. The research method was quasi experiment. The sample in this study was selected through purposive random sampling. The study sample consist of two classes, XI MIPA 4 as the control class and Class XI MIPA 3 as the experimental class. The control class gets learning with discussion methods and the experimental class gets learning with guided discovery learning models. Based on the results of data analysis, the value of tcount is 5.568 and the value of ttable is 2.001 with df = 59 and the significance level is α = 0.05. The results of this study indicate that the tcount is greater than ttable (5.568> 2.001), it can be concluded that there is a positive influence on the application of guided discovery learning learning models to students' chemical literacy in the buffer solution material. Keywords Guided Discovery Learning Model, Chemical Literacy, Buffer Solution

Pengaruh Penerapan Model Pembelajaran Kooperatif Tipe TAI (Team Assisted Individualization) Terhadap Hasil Belajar Siswa Kelas X MIA pada Pokok Bahasan Larutan Elektrolit dan Non Elektrolit Caroline Monica; Tritiyatma Hadinugrahaningsih; Darsef Darwis
Jurnal Riset Pendidikan Kimia (JRPK) Vol 11 No 1 (2021): Jurnal Riset Pendidikan Kimia (JRPK), Volume 11 Nomor 1 (2021)
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JRPK.111.01

This research is aiming to discover effect of the application of Team Assisted Individualization type of cooperative learning model towards learning outcomes students of class X MIA in the subject of electrolyte and non-electrolyte solutions. The design research used in this research is posttest-only nonequivalent control group. This research is performed in Class X MIA, 27 Senior High School Jakarta in academic year of 2018/2019. Sampling technique used in this research is purposive sampling, thus Class X MIA 1 defined as experiment class and Class X MIA 2 defined as control class. The learning model used in experiment class is Team Assisted Individualization learning model, while in the control class is using Active Learning. The results show that there’s a difference in student learning outcomes in experimental class and control class (tcount = 1,995; ttable = 1,668, tcount > ttable). It can be concluded that learning activities using Team Assisted Individualization learning models have a positive influence on student learning outcomes on the subject of electrolyte and non-electrolyte solutions. Keywords:Team Assisted Individualization Learning Model, StudentLearning Outcomes, Electrolyte andNon-electrolyte Solutions

Pengembangan Modul Elektronik Berbasis Model Learning Cycle 5E Pada Pembelajaran Kimia Materi Asam-Basa Darsef Darwis; Ella Fitriani; Dian Styariyani
Jurnal Riset Pendidikan Kimia (JRPK) Vol 10 No 1 (2020): Jurnal Riset Pendidikan Kimia (JRPK), Volume 10 Nomor 1 (2020)
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JRPK.101.02

The purpose of this reseacrh is to develop electronic module based on Learning Cycle 5E model on acid-base materials in chemistry learning. This research process used the ADDIE (Analysis, Design, Develop, Implementation, and Evaluation) research and development method. This research was conducted from December 2018 until June 2019. The research instrument that used ini this study are preliminary and needs questionnaire of students and teachers, media, material and language experts validation questionnaire, and trial test questionnaire on students and teachers. The expert validation of the electronic module was carried out by three material and language experts and media experts. The results of the material and language experts on the overall indicator obtained as good to excellent categories. The results of the media experts on the overall indicator obtained as good to excellent categories. Result of the product trial test to students and teachers on the overall indicator obtained with good to excellent categories. Based on the results obtained, it can be concluded that the devlopment of electronic module based on Learning Cycle 5E on acid-base materials is in accordance with students and teachers needs and has been eligible to be used in the learning process as a source of students learning.

Pengaruh Penerapan Model Blended-Problem Based Learning terhadap Kemampuan Berpikir Kritis Pesrta Didik pada Materi Asam dan Basa Darsef Darwis; Maulana Latif; Arif Rahman
Jurnal Riset Pendidikan Kimia (JRPK) Vol 10 No 2 (2020): Jurnal Riset Pendidikan Kimia (JRPK), Volume 10 Nomor 2 (2020)
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JRPK.102.03

acids and bases topics. Quasy experiment was chosen as research method with posttest only group design. The research population was students of XI IPA 1 and XI IPA 2 in SMA Negeri 26 Jakarta. The sample was established using the purposive sampling technique by choosing two classes as experiment class and control class. The experiment class was taught by using the Blended-Problem Based Learning model, while the control class was taught by using Blended-Explicit Instruction. The data were collected by using critical thinking skill questions. The data analysis technique used independent sample t test. The result showed that the experiment class’s mean was 68,306, while the control class was 58,611. The hypothesis was obtained by value of tcalculate (3,454) > ttable (1,667) with significant level is 0,05. So, it can be concluded that there was positive effect of Blended-Problem Based Learning model on students’ critical thinking skill in acids and bases topics. Keywords Blended-Problem Based Learning, Critical Thinking Skills, Acids and Bases

Pembuatan Biodiesel dari Ulat Jerman (Zophobas morio L.) dengan Metode Transesterifikasi Langsung Menggunakan Pelarut N-Heksana Metanol Oktaviani Cahyaningtyas; Zulmanelis Zulmanelis; Darsef Darsef
Jurnal Riset Sains dan Kimia Terapan Vol 8 No 1 (2019): Jurnal Riset Sains dan Kimia Terapan, Volume 8 Nomor 1, Maret 2019
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Abstrak Penelitian ini bertujuan untuk mengetahui waktu reaksi optimum pembuatan biodiesel dari ulat jerman (Zophobas morio L.) menggunakan katalis H2SO4 dengan metode transesterifikasi langsung. Variasi yang dilakukan adalah waktu reaksi 8, 12, 16, dan 20 jam pada dua kondisi berbeda (perbandingan pelarut n-heksana metanol 1:2 dan 1:5). Hasil dari penelitian inimenunjukkan belum ditemukan waktu optimum pada kedua kondisi. Ditemukan kondisi produk biodiesel paling berpotensi yang telah memenuhi dua dari tiga parameter standar biodiesel yaitu pada kondisi perbandingan pelarut n-heksana metanol 1:5 dengan waktu reaksi 20 jam menghasilkan 20mL biodiesel, densitas 0,8950 g mL-1, viskositas kinematik 12,17 cSt, dan bilangan asam 0,41 mg KOH/g sampel. Berdasarkan uji GC-MS pada biodiesel paling berpotensi didapatkan 4 jenis metil ester yaitu metil palmitat, metil palmitoleat, metil linoleat dan metil stearat. Kata kunci: Biodiesel, metil ester, transesterifikasi langsung, ulat jerman Abstract The aims for this studies was to determine the optimum reaction time of biodiesel from superworm (Zophobas morio L.) using H2SO4 catalyst by direct transesterification method. Reaction times 8, 12, 16, and 20 hours in two different conditions (comparison of hexane-methanol solvents 1:2 and 1:5) were investigated. The results of this study have not yet found optimal time in both conditions. It was found that the most potential condition of biodiesel products had fulfilled two of the three standard biodiesel parameters, was the condition of the comparison of hexane-methanol 1:5 solvents with a reaction time of 20 hours producing 20 mL biodiesel, density 0.8950 g mL-1, kinematic viscosity 12.17 cSt, and acid number 0,41 mg KOH/g sample. The GC-MS result showed the methyl ester from biodiesel product are contains methyl palmitate, methyl palmitoleate, methyl linoleic, and methyl stearat Keywords: Biodiesel, direct transesterification, methyl ester, superworm

Pembuatan Biodiesel Dari Minyak Biji Alpukat (Persea americana) Melalui Proses Transesterifikasi Langsung Shafira Dwita Purnama Putri Shafira; Zulmanelis Zulmanelis; Darsef Darsef
Jurnal Riset Sains dan Kimia Terapan Vol 8 No 1 (2019): Jurnal Riset Sains dan Kimia Terapan, Volume 8 Nomor 1, Maret 2019
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Abstrak Penelitian ini bertujuan untuk menentukan kondisi optimum pembuatan biodiesel dari minyak biji alpukat melalui proses transesterifikasi langsung. Variasi yang digunakan pada penelitian ini adalah variasi waktu reaksi 8, 12, 16 dan 20 jam serta variasi perbandingan campuran heksana-metanol 1:2 dan 1:5. Katalis yang digunakan adalah H2SO4 sebesar 20% berat yang diimpregnasi ke dalam serbuk biji alpukat. Hasil penelitian menunjukkan kondisi optimum pembuatan biodiesel dari biji alpukat adalah pada waktu reaksi 16 jam dengan perbandingan campuran heksana-metanol 1:5. Volume akhir biodiesel yang didapatkan sebesar 1,6 mL dengan densitas sebesar 910,7 kg m-3, viskositas kinematik sebesar 3,3051 cSt dan bilangan asam 1,9418 mg KOH g-1 lemak. Berdasarkan analisis GC-MS produk biodiesel dari kondisi optimum yang berhasil terkonversi adalah metil palmitat Kata kunci: biji alpukat, biodiesel, metil ester, transesterifikasi langsung Abstract The aim of this study was to determine the optimum conditions of making biodiesel from avocado seed oil through a direct transesterification process. The variations used in this study were reaction time of 8, 12, 16 and 20 hours and hexane-methanol mixture of 1:2 and 1:5. The catalyst used was H2SO4 of 20% (wt) that has been impregnated into avocado seed powder. The results showed that the optimum conditions for making biodiesel from avocado seeds were at the reaction time of 16 hours with a hexane-methanol mixture ratio of 1:5. The final volume of biodiesel was 1.6 mL with a density of 910.7 kg m-3, kinematic viscosity of 3.3051 cSt and acid number 1.9418 mg KOH g_1. Based on GC-MS analysis of biodiesel products from the optimum conditions the resulted of fatty acid methyl ester is methyl palmitate. Keywords: avocado seeds, biodiesel, direct transesterification, methyl ester.

Pengaruh Penambahan Biokar Sekam Padi Terhadap Penyerapan Gas CO2 (Carbon Dioxide) Dan Kuat Tekan Pada Plester Dinding Reza Arrafi Rasyid; Erdawati Erdawati; Darsef Darwis
Jurnal Riset Sains dan Kimia Terapan Vol 8 No 1 (2019): Jurnal Riset Sains dan Kimia Terapan, Volume 8 Nomor 1, Maret 2019
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Abstrak Pada penelitian ini dilakukan pengolahan limbah sekam padi menjadi biokar sebagai zat aditif dalam mortar yang berperan sebagai absorben gas CO2 di dalam mortar. Tujuan penelitian ini selain untuk memanfaatkan limbah sekam, tetapi juga untuk mengetahui pengaruh penambahan biokar sekam padi terhadap penyerapan gas CO2 dan kuat tekan pada plester dinding. Pada penelitian ini biokar yang digunakan adalah biokar yang dipirolisis pada suhu 500ºC selama 8 jam. Penambahan biokar dilakukan dengan presentase 0; 10; 12,5 dan 15% dalam campuran mortar dengan komposisi Portland Cement (PC):Pasir (PS) sebesar 1:4 dan faktor air semen sebesar 0,6. Selanjutnya dilakukan pengujian kuat tekan mortar dilakukan setelah perawatan 7 dan 28 hari dan serapan gas CO2. Hasil dari pengukuran kuat tekan dan serpan gas CO2 menunjukan bahwa semakin banyak penambahan presentase biokar dalam campuran mortar akan menurukan kekuatan plester dinding dan penyerapan gas CO2 pada plester. Kata kunci: Biokar, karbon dioksida, kuat tekan, mortar. Abstract Biochar utilization in various fields of life, where biocar is an additive in mortar that acts as CO2 absorbent in the mortar. This study aims to determine the effect of the addition of biochar rice husk form CO2 absorption and compressive strength on wall plaster. The biochar used was characterized by SEM-EDX and FTIR, while the standard plaster samples, 10% biocar+plaster, and 15% biocar+plaster used SAA. In this study biocar which had been pyrolyzed at 500 °C at a pressure of 10 psi, then added at 0; 10; 12.5 and 15% in mortar mix with the composition of Portland Cement (PC):Sand (PS) was 1:4 and Portland Cement (PC): water (W) of 0.6. Mortar compressive strength testing on 7 and 28 treatment days. From the results of the study, the optimal percentage of biocar addition was 10% with compressive strength of 18.5 MPa and CO2 absorption of 0.14 ppm. More biochar additions to the plaster reduce the strength and absorption of CO2 gasplaster. Keywords: Biochar, carbon dioxide, compressive strength, mortar

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