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All Journal JURNAL ILMU PERTANIAN Jurnal Pendidikan dan Pembelajaran Kimia (JPPK)
Albinus Silalahi
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Agriculture, Biological Sciences & Forestry Computer Science & IT Decision Sciences, Operations Research & Management Education

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ASSESSMENT OF THE QUALITY OF CRUDE PALM OIL FROM ELAEIS GUINEENSIS GROWING AREAS OF THE PT. LANGKAT NUSANTARA KEPONG-PTPN II NORTH SUMATERA Ida Duma Riris; Albinus Silalahi
AGRIUM: Jurnal Ilmu Pertanian Vol 20, No 3 (2017)
Publisher : UNIVERSITAS MUHAMMADIYAH SUMATERA UTARA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (242.744 KB) | DOI: 10.30596/agrium.v20i3.1047

Abstract

Palm oil is one of the major fats and oils produced in Indonesia, which is of great value in the diet of many people. The quality of palm oil could be affected by various factors ranging  from improper postharvest handling, processing and storage. Recently, there has been wide spread speculation that palm oil is adulterated in order to maximize profit (Madubuike et al., 2015). The quality parameters of palm oil are generally determined by the moisture content, impurity, specific gravity, percentage of free fatty acid (FFA), iodine value, peroxide value and saponification values. The objective of this research therefore was to evaluate the quality of palm oil samples obtained from elaeis guineensis growing areas of the PT. Langkat Nusantara Kepong-PTPN II North Sumatera. The results showed that mean value of the quality parameters are 0.15% moisture content; 5.71% impurity level; 0.935 specific gravity;8.43% FFA; 52.13 iodine value; 13.71meq/kg peroxide value; and 181,89 mg KOH/g saponification value. The quality parameters are associated with the method of processing.Keywords: Moisture Content, Impurity, Specific Gravity, Percentage Of Free Fatty Acid, Iodine Value, Peroxide Value And Saponification Values.
Analysis Effectiveness of the Online Learning through the Use of Google Classroom during the COVID-19 Pandemic Putri Novira; Albinus Silalahi; Saronom Silaban
Jurnal Pendidikan dan Pembelajaran Kimia Vol 10, No 1 (2021): Jurnal Pendidikan dan Pembelajaran Kimia
Publisher : Universitas Lampung

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The purpose of this study was to analyze the effectiveness of online learning asynchronously through the use of google classroom media at Medan State University, Chemistry Education Departement, batch 2018 in the chemical separation course during the COVID-19 pandemic. This study used descriptive qualitative method. The sample of this research was 29 students of the fifth semester class A chemistry education study program in 2018. The data collection technique used was filling out a questionnaire via google form as many as 24 statements. The results obtained indicate that the benefits of google classroom are good with a percentage of 76.9%, ease, quality of user use, use of google classroom and effectiveness are 86.3%, 80.3%, 81.9%, and success respectively. 88.6% in very good category. In general, the effectiveness of online learning through the use of google classrooms at Medan State University, Chemistry Education Study Program class of 2018 is very good, students find it easy to use google classroom, have very good quality of use of learning, and have good enough use for students.Keywords: online learning, COVID-19, google classroom, effectiveness. 
The Impact of the PBL Model on Senior High School Student Learning Outcomes Using Google Classroom RIZKI Harahap; Albinus Silalahi; Zainuddin Muchtar
Jurnal Pendidikan dan Pembelajaran Kimia Vol 10, No 2 (2021): Jurnal Pendidikan dan Pembelajaran Kimia
Publisher : Universitas Lampung

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Abstract: The Impact of the PBL Model on Senior High School Student Learning Outcomes Using Google Classroom. This study aims to determine the effect of the problem based learning model with the help of google classroom media on the learning outcomes of high school students on the subject of oxidation-reduction reactions at SMAN 1 Siantar. This type of research is an experimental study with a pretest-posttest control design. The data collection of student learning outcomes was obtained from the pretest and posttest scores. This study resulted in the average data of student learning outcomes from the posttest in the experimental class that was greater than the control class, namely 62 and 50. Data analysis used the T-Test test which resulted in a significance value of learning outcomes less than 0.05, namely 0.003. Based on this analysis, it can be concluded that learning using the PBL model with the help of google classroom media has a significant effect on senior high school student learning outcomes on oxidation-reduction material at SMAN 1 Siantar.
Co-Authors Ida Duma Riris Putri Novira RIZKI Harahap SARONOM SILABAN Zainuddin Muchtar