General Chemistry Journal

Penerapan Model Pembelajaran Problem Based Learning (PBL) dan Kecerdasan Emosional Pada Materi Laju Reaksi Di SMA Negeri 1 Tompaso

Vanesa Yunita Lempas, Johny Z. Lombok, Emma J. Pongoh — Mon, 30 Sep 2024 00:00:00 +0000

This research aims to determine student learning outcomes after implementing the PBL learning model and emotional intelligence at SMA Negeri 1 Tompaso. This type of research is quantitative with a quasi-experimental approach. The research population was all class Xl students of SMA Negeri 1 Tompaso, totalling 167 people. The research sample was determined using a random sampling technique of 60 people. The instrunents used in this sheets and emotional intelligence questionnaires. Data analysisnormality tests, homogeneity tests, and hypothesis tests, namely t tests, f tests, and n-gain. The results of the research prove that the application pf the PBL learning model is quite effective in improving student learning outcomes as evidenced by the t-test, the mean pre-test value is 56.03 and pos-test 87.40 it can be seen that the post-test value is greater than the pre-test wit a significance of 0.000, meaning that H₀is accepted and H₁is rejected. Students’ emotional intelligence improves student learning outcomes, the results of the f test with SPSS show an fcount value of 8.184 with a significance 0.008<0.05, so emotional intelligence improves student learning outcomes

Penerapan Model Pembelajaran Problem Based Learning (PBL) dan Kecerdasan Emosional Pada Materi Laju Reaksi Di SMA Negeri 1 Tompaso

Vanesa Yunita Lempas — Tue, 10 Sep 2024 00:00:00 +0000

Penerapan Model Pembelajaran Terbalik Terhadap Hasil Belajar Siswa Pada Materi Hidrokarbon Di Kelas XI SMA Negeri 7 Manado

Devita Sonia Puasa, Sonny Lumingkewas — Tue, 10 Sep 2024 00:00:00 +0000

The aim of this research is to determine the improvement in chemistry learning outcomes of high school students after implementing the flipped learning model. The design of this research is a pre-experimental design (One Group Pretest-Posttest Design). This research was carried out at SMA Negeri 7 Manado, Class XI-J, academic year 2023-2024. As an experimental class with 25 students. Data collection was carried out by giving a pretest before the learning process was carried out and a posstest after the learning process. The research data obtained was that the difference between the average pretest and posttest scores in the experimental class was 48,24. The average pretest score is 30,04 while the average posttest score is 78,28. Before carrying out the one sampel t-test, a normality test was first carried out and it was found that the data was normally distributed. Next, it was tested using the t-test, the result obtained were thiting =-19,09 and tiabel = 2,0106. T_count>T_table It can be concluded that the increase in student chemistry learning out comes in hydrocarbon material in class taught the orevious one.

Teknik Penyelesaian Soal dengan Cara Means Ends Analysis (MEA) dalam Meningkatkan Penguasaan Hukum Hess pada Siswa SMA Negeri 2 Tondano

Orpa Tammu, Freetje Waworuntu — Tue, 10 Sep 2024 00:00:00 +0000

The purpose of this study was to determine that the problem solving technique by Means Ends Analysis (MEA) can improve the mastery of Hess' Law of SMA Negeri 2 Tondano students. The type of research used is Quasi Experimental with a research design design that is one group pretest-posttest design. The sample in this study were all students of class XI IPA Room I which amounted to 20 people. In this study, the data collection instrument was a multiple choice test of 20 items in accordance with the material taught, namely Hess's Law. Data analysis in this study used validity and reliability tests. The results showed that the average student learning outcomes on the pretest were 44.25 while the average student learning outcomes on the posttest were 78.50. Based on the results of the N-gain Score test, the N-gain value obtained is 0.625349 and overall has quite effective criteria. In the N-gain Score, there are no students in the low category (0%), there are 14 students in the medium category (70%) and 6 students in the high category (30%). Based on the N-gain results that have been obtained, it can be concluded that the problem solving technique using Means Ends Analysis (MEA) can improve students' mastery of Hess's Law

Karakterisasi Sifat Fisik dan Kimia Asap Cair Hasil Pirolisis Limbah Potongan Rambut Manusia Asal Minahasa dengan KG-SM

Jovanca Rizky Topol, I Dewe Ketut Anom, Joice D. Caroles — Tue, 10 Sep 2024 00:00:00 +0000

Hair is a specialized derivative structure of the skin and is one of the defining characteristics of humans. Humans strive for the beauty of their hair, one of which is to change the hair model by cutting with various models. This phenomenon has resulted in the amount of hair waste generated every day from thousands of salons increasing rapidly. One of the natural materials that has been rarely utilized and difficult to decompose is human hair cut waste. The purpose of this study was to analyze the characteristics of physical and chemical properties of liquid smoke from pyrolysis of human hair waste from Minahasa. The method used to convert human hair waste into liquid smoke is pyrolysis. The physical properties of liquid smoke from pyrolysis of Minahasa human hair are: calorific value 8,166 cal/gr, viscosity 14.121 cSt, density 0.9837 g/ml, flash point 31^oC, smoke point 172.4^oC, boiling point 139.2^oC, freezing point -14.6^oC. GC-MS analysis of liquid smoke liquid from pyrolysis of Minahasa native human hair pieces produced 30 peaks of chemical compounds. Based on these results, it can be concluded that pyrolysis of 1350 g of human haircut waste obtained a total yield of 105 g by weight of liquid smoke, with a percentage of 7.77%

Isolasi Dan Identifikasi Senyawa Turunan Clerodin Dari Fraksi n-Butanol Daun Leilem (Clerodendrum minahassae Teijsm. & Binn)

Miguel J. A. Winokan, Rymond J. Rumampuk, Emma J. Pongoh — Tue, 10 Sep 2024 00:00:00 +0000

The clerodin compound has been identified in various plants of the Clerodendrum genus, this compound has antifeedant properties. Leilem (clerodendrum minahassae Teijsm & Binn) belongs to the genus clerodendrum. Leilem is an endemic plant to North Sulawesi, which is widely used as a food ingredient and traditional medicine. This research aims to isolate and identify clerodin derivative compounds from the n-butanol fraction of leilem leaves. The stages of compound isolation were solid-liquid extraction using maceration, fractionation using the liquid-liquid extraction method, separation of chemical components using the gravity column chromatography (KKG) and thin layer chromatography (TLC) methods, so that 2.1 mg of Fm1 isolate was obtained. Compound identification using the Proton Nuclear Magnetic Resonance Spectroscopy (1H-RMI) technique. The results identified the Fm1 isolate as a clerodin derivative compound

Pengembangan Media Evaluasi Analisis Miskonsepsi Berbasis Android Pada Materi Ikatan Kimia Siswa Kelas XI di SMA Wonder School Manado

Indra Hizkia Labesi, Jeanne M. Tuerah, Joice D. Caroles — Wed, 11 Sep 2024 00:00:00 +0000

The aim of this research is to develop Android-based learning evaluation media to analyze student learning outcomes on chemical bonding material. Another objective is to test the feasibility of the application based on validation tests on material experts, media experts and user/responders (students). This type of research included in Research and Development/ RnD with 4 stages, namely: 1) Analysis, 2) Design, 3) Development and 4) Implementation which is applied to 2^nd class at Wonder School Senior High School Manado. The research results show that the material expert validation result is 44 with a feasibility value of 88.46% in the “Very Feasible” category. The media expert’s results were 90% in the “Very Feasible” category. The total respondents were 20 students with test results of 81.37%. Analysis of the misconception concpet found that 22% students were in the category of understanding the concept, 10% of students in the category of not understanding the concpet and 69% of sttudents in the category of misonceptions. Thus, the learning evaluation media product can be declared suitable for implementation

Identifikasi Dan Karakterisasi Asap Cair Hasil Pirtolisis Limbah Potongan Rambut Manusia Asli Papua

Rambert Romeo Bogar, I Dewe Ketut Anom, Abdon Saiya — Wed, 11 Sep 2024 00:00:00 +0000

Human hair clippings are one of the most common types of waste found in various places. One of the abundant sources of waste, especially in barbershops and hair care related industries. The problem with human haircut waste is the lack of processing of human haircut waste so that it can pollute the environment if it is simply thrown away or burned. The aim of this research is to convert human haircut waste into liquid smoke, analyzing the physical and chemical properties of liquid smoke resulting from pyrolysis of human haircut waste from native Papua. The results of observations of pyrolysis of human hair cuttings were carried out by heating to a temperature of around 80^oC-280^oC. The physical properties of liquid smoke resulting from pyrolysis of native Papuan human hair clippings are: calorific value 8,028 cal/gr, viscosity 21.047 cSt, density 0.9939 g/ml, flash point 34.2^oC, smoke point 176.1^oC, boiling point 146.7^oC, freezing point -14.2^oC. KG-SM analysis of liquid smoke resulting from pyrolysis of native Papuan human hair clips produced 30 chemical compound peaks. From these results it can be concluded that pyrolysis of 915 g of human haircut waste resulted in a total yield of 75 g by weight of liquid smoke

Efektivitas Pembelajaran Daring Pada Materi Larutan Penyangga Di Kelas XI SMA Negeri 3 Kotamobagu

Ratika Pobela, Dessire Adna Rumondor — Mon, 30 Sep 2024 00:00:00 +0000

It examines the effectiveness of online model learning on buffer solution material. This study was conducted at SMA Negeri 3 Kotamobagu in the 2021/2022 even semester. 28 class XI B students participated in this study. The research findings show that the teacher's ability to manage online learning is very effective with a score of 3.58, student activities during the online learning process are active with a score of 3.39, students' responses to the online learning model are positive with 77.5% agreeing, and students' learning outcomes through the online model completed classic. The N-gain score calculation on pretest and posttest results showed medium and high learning improvement after online treatment. Similarly, online buffer solution learning achieved a good N-gain based on pretest and posttest. Based on data analysis of the five criteria met, online models in buffer solution material in class XI SMA Negeri 3 Kotamobagu are effective