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All Journal Jurnal Pendidikan Kimia (JPKim) AL-HAYAT: Journal of Biology and Applied Biology Jurnal Inovasi Pembelajaran Kimia (Journal Of Innovation in Chemistry Education) Jurnal Ilmu Pendidikan Indonesia

Irving Josafat Alexander

Universitas HKBP Nomensen Medan

Author-ID : 6738322

Biochemistry, Genetics & Molecular Biology Chemistry Education Environmental Science Mathematics Physics Social Sciences

Published : 6 Documents Claim Missing Document

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Articles

Pengembangan Pembelajaran Kimia Larutan Berdasarkan Ilmu Pengetahuan dan Pengaruhnya Terhadap Hasil Belajar dan Minat Siswa di Kelas XI SMA Ramlan Silaban; Freddy Tua Musa Panggabean; Sary Marcella Sitompul; Patricia Rohana Septiana Simarmata; Irving Yosafat Silaban
Jurnal Inovasi Pembelajaran Kimia (Journal Of Innovation in Chemistry Education) Vol 1, No 2 (2019): OKTOBER 2019
Publisher : Universitas Negeri Medan

This study aims to obtain chemistry-based teaching materials for scientific literacy on buffer solution materials that meet BSNP criteria, and to the extent able to improve the chemistry learning outcomes of high school students. This type of research is the development of ADDIE research model carried out in class XI MIA SMA Parulian 1 Medan. The instruments used were test and non-test instruments that had fulfilled validity. The study was conducted in 2 stages, namely the manufacturing phase of teaching materials based on scientific literacy and the limited trial phase. The results of the study are (1), it has been obtained teaching materials Buffer Solution based on science literacy that meet BSNP standards namely content eligibility = 3.51, presentation eligibility = 3.49, Language eligibility = 3.64, and feasibility of graphic = 3.69. (2), the results of limited trials in learning indicate that the average value of student learning outcomes in experimental class I was 83.10 higher than experimental class II of 75.24. (3), the results of limited trials in learning showed that the average student interest in the experimental class I was 79.33 higher than in the experimental class II which was 69.45.

PEMBUATAN MINYAK KELAPA MURNI (Virgin Coconut Oil, VCO) MELALUI KOMBINASI TEKNIK FERMENTASI DAN ENZIMATIS MENGGUNAKAN GETAH PEPAYA Ramlan Silaban; Vivi Hutapea; Riza Manullang; Irving Josafat Alexander
Jurnal Pendidikan Kimia (JPKim) Vol 6, No 2 (2014): Agustus
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. This study aims to determine the yield of Virgin Coconut Oil (VCO) is made through a combination of fermentation and enzymatic techniques using papaya latex. Previous papaya sap is processed into crude papain enzyme and fermentation using yeast tempeh (Rhizopus oligosporus). Concentration of 100 ml coconut milk is added 0.5 grams of tempeh and coarse with variation of the enzyme papain 0.0 grams; 0.2 grams; 0.4 grams; 0.6 grams; 0.8 grams and with a pH of 3.4 and 5 variations of this mixture was incubated for 24 hours at room temperature. Of 100 mL of milk obtained optimum yield Virgin Coconut Oil (VCO) of 27.8 mL of the enzyme at a concentration of as much as 0.6 grams of crude papain at pH 5. addition of the enzyme papain is able to increase the yield of coarse Virgin Coconut Oil (VCO), but at a certain concentration will be able to lower the yield. The lower the pH, the lower the yield of Virgin Coconut Oil (VCO) is obtained. Analysis of the quality of Virgin Coconut Oil (VCO) in terms of free fatty acid 0.1720%, 0.18% and a water content of 9.45 mg iodine / g. The Virgin Coconut Oil (VCO) obtained had been met requirement set by SNI standard’s. Kata kunci: Virgin Coconut Oil (VCO), Getah Pepaya, Ragi Tempe

ANDROID-BASED LEARNING MEDIA DEVELOPMENT FOR CHEMICAL BALANCE MATERIALS Ramlan Silaban; Freddy TM Pannggabean; Melhyada Veronika Panggabean; Pelita Ananda Sianturi; Irving Josafat Alexander
Jurnal Ilmu Pendidikan Indonesia Vol 9, No 3 (2021)
Publisher : Program Magister Pendidikan IPA, Program Pascasarjana Universitas Cenderawasih

This study aims to obtain an innovative android-based chemistry learning media for Chemical Equilibrium material in Class XII MIA. To achieve this goal, research on the type of development using the 4D method has been carried out. The media obtained were tested for feasibility, referring to the feasibility indicators of learning media in the National Education Standards Agency, BSNP involving expert validators. The research result show that(1) An android-based chemistry learning media (ChemsDroid) has been obtained on chemical equilibrium topic.(2). The ChemsDroid media obtained has met the eligibility criteria based on the National Education Standards Agency (BSNP), namely content feasibility, graphic feasibility, language feasibility and presentation feasibility.(3) The results of the perception test showed that students gave a very good response.

EFEKTIVITAS MODEL PROBLEM BASED LEARNING BERMEDIAKAN LEMBAR KERJA PESERTA DIDIK TERHADAP HASIL BELAJAR KIMIADAN KEMAMPUAN BERPIKIR KRITIS PESERTA DIDIK SMA RAMLAN SILABAN; FREDDY TUA MUSA PANGGABEAN; ESRIDA HUTAHAEAN; FELIA MUTIARA HUTAPEA; IRVING JOSAFAT ALEXANDER
Jurnal Ilmu Pendidikan Indonesia Vol 9, No 1 (2021)
Publisher : Program Magister Pendidikan IPA, Program Pascasarjana Universitas Cenderawasih

The aim of this research is to know the effectivenessproblem based learning model (PBL) using student worksheet on learning outcomes and students’critical thinking skills on the teaching Reaction Rate. The population in this research was grade 11th of SMA Negeri 6 Medan. Classes sample was taken by random sampling, and two classes were selected as a sample. Those two classes will be taught with Problem Based Learning model, the difference is the first class will be used students worksheets and the other class is not. The instrumentto conduct this researchwas by test and non-test. Based on parametric statistical test, the result of pretest, postest, and students’ critical thinking skills data from those two classes have a normal distribution and homogeny. Hypothesis was tested by using one tailed test with significant level ( ) =0,05. The data from hypothesis testing learning outcomes is tcal ttable (3,101 1,669), means Hois rejected and Ha is accepted. Hypothesis testing result on students’ learning outcomes using student worksheets is higher than the non-using student worksheet. Critical thinking hypothesis test is tcal ttable (4,754 1,669), means Hois rejected and Ha is accepted. Hypothesis testing result oncritical thinking using student worksheet is higher than the non-using student worksheet. Contribution of students’ critical thinking to the ups and downs of learning outcomes on the experiment class is 81,5%.

Analysis of the Utilization of Hydroponic Media in Welsh Onion Cultivation (Allium fistulosum L.) Gloria Sirait; Irving Josafat Alexander; Ramlan Silaban
Al-Hayat: Journal of Biology and Applied Biology Vol 6, No 2 (2023)
Publisher : Fakultas Sains dan Teknologi, UIN Walisongo Semarang

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

The food crisis is a condition when acute food hazards and net malnutrition increase sharply. One reason is due to a slowdown in food production. In 1627, a new farming method was known, called hydroponics, namely the method of growing with the help of water. After further investigation, it was found that the cultivation method with water will eventually produce plants that are as good as plants grown using soil media. Therefore, this research will explore the benefits of using hydroponic media in leek cultivation. In this study, there were two containers, the first container was not subject to the application of pesticides, while the second container was watered with onion peel vegetable pesticides twice a week. The results of the leek planting experiment in the hydroponic system and media showed that the maximum height achieved by the leek plants tested was as high as 22.8 cm, and only 3 out of 17 total plants died.

Preparing of chemical bonding learning media based android using smart apps creator program Ramlan Silaban; Osi Annauli Br Girsang; Roselva Theresia Manalu; Marham Sitorus; Simson Tarigan; Irving Josafat Alexander
Jurnal Pendidikan Kimia (JPKIM) Vol 15, No 3 (2023): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v15i3.51492

The aim of this research is to obtain Android-based chemical bond learning media using the smart apps creator program that is feasible and eligible to use. To achieve the goal, development research has been carried out which refers to the 4 D model with the stages define, design, develop and disseminate. The research was conducted at SMA Negeri 5 Medan involving teachers and students of class X MIA. The research instruments used are non-test instruments including needs analysis instruments, feasibility test instruments and student response instruments. The research results are: (1). An Android-based chemical bond learning media has been obtained using a smart apps creator program with features main view, main menu, learning material, evaluation, summary and references. (2). The Android-based chemical bond learning media obtained was deemed suitable for use in learning with a feasibility level of 85.0% with very worthy category. (3). The students give good eligibility responded (82.6%) for the Android-based chemical bond learning media obtained with meets the requirements for use as learning media.Keywords: Android based; Chemical bonding; Learning media; Smart apps creator program

Co-Authors ESRIDA HUTAHAEAN FELIA MUTIARA HUTAPEA Freddy Tua Musa Panggabean Gloria Sirait Marham Sitorus Melhyada Veronika Panggabean Osi Annauli Br Girsang Patricia Rohana Septiana Simarmata Pelita Ananda Sianturi Ramlan Silaban Ramlan Silaban Ramlan Silaban Riza Manullang Roselva Theresia Manalu Sary Marcella Sitompul Simson Tarigan Vivi Hutapea

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