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Sintesis Triacetin dari Gliserol dan Asam Asetat dengan Katalis Zeolit Alam Termodifikasi Semuel Gideon Rommy Kosegeran; Sanusi Gugule; Johny Zeth Lombok
Jurnal Kimia Fullerene Vol 6 No 2 (2021): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v6i2.362

Research has been conducted on the synthesis of triacetin from glycerol and acetate acid by the modify of natural zeolite catalyst with sulfuric acid 6N and followed by the characterization of the results of the reaction. Modified natural zeolite followed by an analysis of infrared spectrophotometry and x-ray diffraction (XRD). The characterization showed that modified natural zeolite has mordenite characteristics. The concentration of modified zeolite used is 3, 5, and 7% by weight of acetate acid as its reactant. Data processing used is one-way variation analysis and its characteristics seen in the physical-chemical test, followed by an analysis of gas chromatography-mass spectroscopic (GCMS) and infrared spectrophotometry. Based on the results of data processing, the concentrations of modified zeolite 3, 5, and 7% did not affect the yield of triacetin esterification reactions, the results respectively were 75,2881%, 71,9681%, and 69,0431%. The characterization results show that the physical-chemical properties of the reaction such as density, viscosity, and solubility are not following Standar Nasional Indonesia (SNI) of triacetin. The results of the GCMS analysis showed that there were two peaks with their respective fragments and the results of the infrared spectrophotometric analysis showed the presence of functional groups absorption for ester compounds.

Penerapan Blended Learning Berbasis Zoom Cloud Meeting Untuk Meningkatkan Hasil Belajar Siswa Pada Materi Larutan Elektrolit Dan Nonelektrolit Junike Rondonuwu; Johny Zeth Lombok
Oxygenius Journal Of Chemistry Education Vol 4 No 1 (2022): Oxygenius : Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/ojce.v4i1.372

Blended learning is mixed learning, namely online and face-to-face learning. Because it is still during the Covid-19 pandemic, learning is currently still being carried out online. To support the online learning process, the Zoom Cloud Meeting application is used. The learning process can also be carried out offline but in accordance with the protocol from the government. This study aims to determine student learning outcomes after being given treatment can exceed the KKM value. The study used an experiment with a one shoot case study research design. This research was conducted at SMA Negeri 1 Tutuyan for the academic year 2020/2021 with 29 students in class X MIA 1. The data collection technique was a posttest and the instrument used to measure learning outcomes was a multiple choice test. The results of this study used the t-test one sample t-test with the results of ttable 1.701 and tcount 28.8476 with a significant level of 5% and therefore ttable was smaller than tcount. Thus, it means that H1 is accepted and H0 is rejected. So it was concluded that student learning outcomes after being given treatment can increase and exceed the KKM value.

PENGGUNAAN MODEL PEMBELAJARAN KOOPERATIF TPS BERBANTUAN MEDIA PEMBELAJARAN CHEMISTRY COMIC PADA MATERI REDOKS DI SMA N 1 LANGOWAN Eva taida Manullang; Johny Zeth Lombok
Oxygenius: Journal Of Chemistry Education Vol 5 No 1 (2023): Oxygenius : Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/ojce.v5i1.542

Proses belajar mengajar dengan penggunaan media dan model pembelajaran belum maksimal. Keaktifan peserta didik pada saat proses pembelajaran masih kurang, peserta didik belum terlatih menemukan solusi atau berpikir kreatif untuk memecahkan masalah, peserta didik kaku dalam berbagi hasil diskusi/presentasi, peserta didik bersikap acuh tak acuh terhadap materi pelajaran yang disampaikan oleh guru. Penelitian ini bertujuan untuk mengetahui penggunaan perbedaan model kooperatif TPS berbantuan media chemistry comic untuk meningkatkan hasil belajar peserta didik pada pokok bahasan redoks kelas X di SMA Negeri 1 Langowan tahun ajaran 2022/2023 Jenis penelitian yaitu penelitian eksperimen. Sampel yaitu kelas X-f terdiri dari 30 peserta didik sebagai kelas kontrol dan X-g terdiri dari 30 peserta didik sebagai kelas eksperimen. Teknik pengumpulan data menggunakan tes hasil belajar dengan instrument tes berupa soal pilihan ganda. Data hasil penelitian dianalisis menggunakan statistik Uji-T pada taraf signifikan 0,05 dan diperoleh hasil Thitung = 8,69 > Ttabel = 2,00. Dari hasil tersebut dapat disimpulkan bahwa terdapat perbedaan penggunaan model kooperatif TPS berbantuan media chemistry comic untuk meningkatkan hasil belajar peserta didik.

Characterization and Identification Compounds of Liquid Smoke from Used Tire Waste Pyrolysis Lombok, Johny Zeth; Anom, I Dewa Ketut
Indonesian Journal of Chemical Research Vol 11 No 1 (2023): Edition for May 2023
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.11-lom

Research on compounds from liquid smoke resulting from the pyrolysis of used tire waste has been conducted. The results of tire pyrolysis produce liquid hydrocarbons and charcoal which can be utilized and developed into more useful materials or finished goods. This study aims to identify the compound components of liquid smoke resulting from the pyrolysis of used tire waste. The research begins with manufacturing a pyrolysis tool based on the principle of dry distillation. The pyrolysis process is carried out by heating at high temperatures. Liquid smoke analysis was carried out using GC-MS. In contrast, the components of the compound were identified and characterized by comparing the mass spectrum data obtained with the mass spectrum data in the GC-MS library. The results showed that the pyrolysis of 6 kg of used tires produced 1500 mL of liquid smoke. Analysis of liquid smoke by GC-MS produced 88 chromatogram peaks, with the most dominant peak height at peaks 3, 17, 37, 38, 72, and 73. The most dominant compound component identified by MS spectrum analysis is 2-propanone (peak 3), 4-methyl-2-pentanone (peak 17), ethyl-benzene (peak 37), 1,2-dimethyl-benzene (peak 38), 1-methyl-4-(1-methyl ethyl)-benzene (peak 72) and limonene (peak 73).

Analysis of Chemical Components and Antioxidant Activity in Nutmeg Shell Liquid Smoke Processed through Rotary Evaporator Purification Watuseke, Rommy David; Gugule, Sanusi; Lombok, Johny Z
Indonesian Journal of Chemical Research Vol 12 No 2 (2024): Edition for September 2024
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2024.12-rom

This study aims to analyze liquid smoke's chemical content and antioxidant activity from pyrolysis of nutmeg (Myristica fragrans) shell with rotary evaporator purification. A rotary evaporator purified liquid smoke from the pyrolysis of nutmeg shells. Identification of the chemical components of liquid smoke from the pyrolysis of nutmeg shells was carried out by Gas Chromatography-Mass Spectroscopy (GC-MS), and Antioxidants were measured using the DPPH (2,2-diphenyl-1-picrylhydrazyl) method with absorbance at a wavelength of λ 517 nm. The results of GC-MS analysis showed 14 peaks and 19 types of compounds detected with the 2-methylphenol compound component located at a retention time of 4.974 minutes, standing out with the largest contribution in terms of area, reaching 47.74%. The antioxidant test showed that the nutmeg shell has IC50 values before and after rotary evaporation of 0.40% and 0.07%, having strong antioxidant activity, and the results at a concentration of 3.2 mg/ml provided a level of free radical protection of more than 50%, namely 91.14%. The main compounds that play as antioxidants are phenol compounds and their derivatives, such as 2-methoxy-phenol and 2-methoxy-4-methyl-phenol.

PERSEPSI GURU KIMIA TERHADAP IMPLEMENTASI KURIKULUM MERDEKA DI SMA NEGERI 9 MANADO Datang, Priskila Elin; Lombok, Johny Zeth; Kumajas, Jenny
SOSCIED Vol 7 No 1 (2024): SOSCIED - Juli 2024
Publisher : LPPM Politeknik Saint Paul Sorong

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32531/jsoscied.v7i1.803

The independent curriculum is a new breakthrough program provided by the Ministry of Education and Culture Nadiem Makariem to provide learning freedom to students and teachers in determining the learning process they are interested in. The independent curriculum is a form of improvement from the previous curriculum, namely curriculum 13 (K13). As a new education system, it must have changes in the education process compared to the previous curriculum. This has led to different positive and negative responses from teachers. For this reason, researchers are interested in describing how the perceptions of teachers, especially chemistry teachers, regarding the implementation of the independent curriculum at SMA Negeri 9 Manado. This research was conducted offline by distributing printout questionnaires to 6 chemistry teachers at SMA Negeri 9 Manado. The questionnaire in this study was analyzed using a Likert scale. The results showed that the perception of chemistry teachers regarding the implementation of the independent curriculum was classified as a good category with a percentage of 71%. Teachers agree and even strongly agree on the concept of freedom of learning which focuses on changing student character. The teachers also agree with the concept of freedom of learning offered in the independent curriculum, because students and teachers are free to choose learning media, as well as the concept of independent learning by students with a learning system that can be accessed anywhere and anytime by students. They also disagreed that character surveys for graduation requirements could

PENGEMBANGAN MEDIA PEMBELAJARAN BERBASIS ANDROID PADA MATA PELAJARAN KIMIA MATERI LAJU REAKSI DI SMA NEGERI 2 TONDANO Saenal, Muhammad; Lombok, Johny Z.; Caroles, Joice D. S
SOSCIED Vol 8 No 1 (2025): SOSCIED - Juli 2025
Publisher : LPPM Politeknik Saint Paul Sorong

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32531/jsoscied.v8i1.923

The development of android-based learning media in chemistry subject matter of reaction rates in this study aims to determine the feasibility of the learning media that has been made. This research is a Research and Development by adapting the ADDIE development model which consists of five stages, namely Analysis, Design, Development, Implementation and Evaluation. The data collection instruments in this study consisted of material expert validation sheets and media expert validation sheets as well as educator and student response questionnaires. This study shows that the results of the media expert validation carried out obtained an average percentage of 88.3% with the appropriate or valid category and the results of the material expert validation carried out obtained an average percentage of 87.5% with the appropriate or valid category and the results questionnaires from educator responses obtained an average percentage of 98.6% in the appropriate or valid category and questionnaires from student responses obtained an average percentage of 87.4% in the appropriate or valid category. The developed learning media is able to improve student learning outcomes from an average percentage of 75.9% to 84.4%. Based on the results of the description above, the android-based chemistry learning media on the reaction rate material developed is considered feasible and effective for use in chemistry learning

PERSEPSI GURU KIMIA TERHADAP IMPLEMENTASI KURIKULUM MERDEKA DI SMA NEGERI 9 MANADO Datang, Priskila Elin; Lombok, Johny Zeth; Kumajas, Jenny
SOSCIED Vol 7 No 1 (2024): SOSCIED - Juli 2024
Publisher : LPPM Politeknik Saint Paul Sorong

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32531/jsoscied.v7i1.803

The independent curriculum is a new breakthrough program provided by the Ministry of Education and Culture Nadiem Makariem to provide learning freedom to students and teachers in determining the learning process they are interested in. The independent curriculum is a form of improvement from the previous curriculum, namely curriculum 13 (K13). As a new education system, it must have changes in the education process compared to the previous curriculum. This has led to different positive and negative responses from teachers. For this reason, researchers are interested in describing how the perceptions of teachers, especially chemistry teachers, regarding the implementation of the independent curriculum at SMA Negeri 9 Manado. This research was conducted offline by distributing printout questionnaires to 6 chemistry teachers at SMA Negeri 9 Manado. The questionnaire in this study was analyzed using a Likert scale. The results showed that the perception of chemistry teachers regarding the implementation of the independent curriculum was classified as a good category with a percentage of 71%. Teachers agree and even strongly agree on the concept of freedom of learning which focuses on changing student character. The teachers also agree with the concept of freedom of learning offered in the independent curriculum, because students and teachers are free to choose learning media, as well as the concept of independent learning by students with a learning system that can be accessed anywhere and anytime by students. They also disagreed that character surveys for graduation requirements could

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