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All Journal Jurnal Riset Pendidikan Kimia (JRPK) Jurnal Riset Sains dan Kimia Terapan
Zulmanelis Darwis
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Chemistry Education

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Pengaruh Penerapan Model Pembelajaran Kooperatif Tipe Group Investigation Berbasis ICT Terhadap Kemampuan Komunikasi Peserta Didik Pada Materi Larutan Elektrolit dan Non Elektrolit Linda Astuti; Sukro Muhab; Zulmanelis Darwis
Jurnal Riset Pendidikan Kimia (JRPK) Vol 9 No 1 (2019): Jurnal Riset Pendidikan Kimia (JRPK), Volume 9 Nomor 1 (2019)
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (194.288 KB) | DOI: 10.21009/JRPK.091.05

Abstract

This study aims to determine the effect of the application of cooperative learning models type Group Investigation based ICT on students' communication skills. This research was conducted with quantitative methods. The sampling technique uses purposive sampling. Learning was carried out in one experimental class and one control class by applying cooperative learning models type GI based ICT and non ICT. The research instrument uses statement questions that have been declared valid and reliable. The results of hypothesis testing of two independent samples obtained t stat (2,897)> t table (1,667), so it can be concluded that there is a positive influence on the application of cooperative learning type Group Investigation based ICT on students’ communication skills. Further analysis on each indicator of communication skills, it can be seen that indicators identifying problems, gathering information, and drawing conclusions have a significant influence on the results of the experimental class and the control class. While indicators write summaries and use good grammar and spelling, there is no significant influence between the experimental class and the control class. Keywords Communication Skills, Cooperative Learning Models Type Group Investigation, ICT Based Learning
Pengaruh Strategi REACT (Relating, Experiencing, Applying, Cooperating, Transfering) Terhadap Hasil Belajar Peserta Didik Pada Materi Asam Dan Basa Annisa Aulia Harmin; Zulmanelis Darwis; Setia Budi
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.101.05

Abstract

This study aims to determine the effect of the application of REACT Strategies (Relating, Experiencing, Applying, Cooperating, Transfering) to the learning outcomes of students on Acid and Base material. This research was conducted in January-February 2019 at SMA Negeri 39 Jakarta using the Quasy Experimental design, Nonequivalent Control Group Design. The experimental and control groups were each given an initial ability test before learning and post-test after the learning process ended. The experimental group was given a REACT learning strategy while the control group formed a 5M learning strategy. REACT Learning Strategy consists of 5 stages, namely relating, experiencing, applying, cooperating, and transferring. The results showed the average post-test in the experimental group was better than the control group of 77.42 and 66.95. Then the statistical test results obtained tcount> ttable is tcount of 3.64 while ttable with a 5% significance level of 1.67. Related to the application of the REACT learning strategy (Relating, Experiencing, Applying, Cooperating, Transfering) has a positive influence on the learning outcomes of chemistry in Acid and Base materials. Keywords REACT Strategy, Learning Outcomes, Acids and Bases
Pengaruh Perbandingan Pati Biji Sorgum (Sorghum Bicolor (l.) Moench) dan Poly Lactic Acid (PLA) terhadap Karakteristik Plastik Biodegradable Siti Sarifah; Yusmaniar Yusmaniar; Zulmanelis Darwis
Jurnal Riset Sains dan Kimia Terapan Vol 7 No 1 (2017): JRSKT - Jurnal Riset Sains dan Kimia Terapan, Volume 7 Nomor 1 Juli 2017
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (586.93 KB) | DOI: 10.21009/JRSKT.071.05

Abstract

This study aims to determine the effect of Sorghum and Poly lactic acid (PLA) on the plastic characteristics that can be seen from tensile strength, water resistance, and biodegradability. The method used blending (mixing) sorghum seed starch, PLA, glycerol, acetic acid, and maleic anhydride. From the results of infrared spectrum analysis on the visible plastic peak area 2250-2300 cm-1 which indicates the absorption of carbon dioxide. This plastic has an optimum water resistance of 92.76% in the ratio of Pati 0.6g: PLA 2.6g. The optimum tensile test results in a comparison of 0.2g starch: PLA 3g with a value of 10.58 Mpa. Optimum biodegradation test results in starch ratio of 0.6g: PLA 2.6g of 13.61%. From the data obtained can be concluded the optimum biodegradation and water endurance test on the ratio of starch 0.6g: PLA 2.6g. Keyword: Seaweed starch, PLA, glycerol, maleic anhydrous, biodegraded plastic
Co-Authors Annisa Aulia Harmin Linda Astuti Setia Budi Siti Sarifah Sukro Muhab Yusmaniar