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All Journal Fullerene Journal of Chemistry Oxygenius Journal Of Chemistry Education
Djefry Tani
Universitas Negeri Manado
Chemistry Education

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Optimalisasi Adsorpsi Kitosan Dari Kitin Cangkang Keong Sawah (Pilla Ampullacea) Terhadap Logam Kadmium (Cd) Olivia Indra Moray; Djefry Tani; Dokri Gumolung
Jurnal Kimia Fullerene Vol 6 No 1 (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.v6i2.172

Abstract

This research aims to make the chitosan from the chitin of the Snail shell (Pilla ampulacea) which can be used as a cadmium metal adsorbent (Cd). It is derived from the isolation of the snail shells through 2 phases, which are deproteination to remove protein and demineralization to remove mineral salts. The formed Kitin is transformed into Chitosan by deacetylated using NaOH 60%. Kitin and Chitosan were acquired, identified by FTIR. The results showed that the chitin yield was 26.81% of the shell weight of 400 grams and the rendemen Chitosan was 31.78% of the weight of chitin. The results of the identification indicate the absorption area of chitin and chitosan function groups, similar to the standard chitin and chitosan uptake areas. Metal adsorption Cd uses adsorbent chitosan from the shell snail (pilla ampulacea) Most optimal occurs at a contact time of 15 minutes and on the weight of adsorbent 0.25 grams, the most optimal absorption occurs at a comparison of 1:30 weight chitosan/volume solution Cd.
Optimasi Spesiasi Kromium Ke Bentuk Cr(III) - Tanat Jenifer Alfonda Walewangko; Djefry Tani; Joice Caroles
Jurnal Kimia Fullerene Vol 5 No 1 (2020): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (370.156 KB) | DOI: 10.37033/fjc.v5i1.103

Abstract

This research was conducted to determine the heavy metal species of Cr (III). Determination of heavy metals is determined based on the required chromium species using the UV-Vis spectrophotometry method. The sample used was CrCl3.H2O and the complexing agent was tannic acid. This research was conducted to determine the effect of pH, concentration and time of stability by finding the optimum conditions of the chromium - tanic acid complex. The optimum pH is at pH 11, the optimum concentration is at a ratio of 5: 1 concentration (Cr: tanic acid), the stability of time is at the 10th minute.
Pengaruh Penggunaan Metode Case Based Instruction (CBI) terhadap Pemahaman Siswa Kelas X pada Materi Hukum-Hukum Gas di SMA Negeri 1 Tompaso Astrid Magritha Singal; Wilson Rombang; Djefry Tani
Oxygenius Journal Of Chemistry Education Vol 1 No 2 (2019): Oxygenius : Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (481.208 KB) | DOI: 10.37033/ojce.v1i2.115

Abstract

Penelitian ini bertujuan meningkatkan pemahaman siswa yang diajarkan menggunakan metode pembelajaran CBI lebih tinggi dari pemahaman siswa yang diajarkan menggunakan metode pembelajaran konvensional. Penelitian ini dilaksanakan di SMA Negeri 1 Tompaso, sampel penelitian ini adalah kelas X MIA 2 sebagai kelas eksperimen dan X MIA 1 sebagai kelas kontrol. Dapat dilihat dari hasil uji F (One Way ANOVA) menunjukkan bahwa Fhitung > Ftabel yaitu 11.07599 > 4.04 dan nilai probabilitas P value < 0,05 yaitu 0.001685 < 0,05 dan hasil uji t diperoleh hasil = 3,32812 = 1,677. Jadi, Thitung > Ttabel , maka tolak Ho dan terima H1 sehingga . Berdasarkan analisis data hasil penelitian dapat disimpulkan bahwa pemahaman siswa yang diajarkan dengan menggunakan metode pembelajaran Case Based Instruction lebih tinggi dari pada pemahaman siswa yang diajarkan menggunakan metode pembelajaran konvensional.
Analisis Miskonsepsi Siswa dengan Menggunakan Tes Diagnostik Two-Tier Multiple Choice pada Materi Struktur Atom di SMA NEGERI 1 Remboken Rivya Tamungku; Djefry Tani; Jeanne Tuerah
Oxygenius Journal Of Chemistry Education Vol 1 No 2 (2019): Oxygenius : Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (373.324 KB) | DOI: 10.37033/ojce.v1i2.109

Abstract

Misconceptions can be in the form of initial concepts, mistakes, incorrect relationships between concepts, intuitive ideas or naive views. From the explanation that has been described misconception is interpreted as an initial concept owned by students that is not in accordance with the generally accepted explanation as a result of the experience constructed by students. Misconception can also be called an alternative concept. This study aims to determine the misconceptions of Class X students of Natural Sciences 2 of SMA Negeri 1 Remboken on atomic structure material. Data collection uses questions in the form of a two-tier diagnostic test, which was tested on 20 students. From the results of the study concluded that students who understood the concept of 82.75%, and students who experienced misconceptions as much as 11.25% while students who did not understand the concept of 6% in the Atomic Structure material.
Penerapan Penuntun Praktikum Dengan Menggunakan Metode Discovery Learning Untuk Meningkatkan Hasil Belajar Siswa Pada Materi Larutan Elektrolit Dan Nonelektrolit Istiani Astari Nanangkong; Rymond Rumampuk; Djefry Tani
Oxygenius Journal Of Chemistry Education Vol 1 No 2 (2019): Oxygenius : Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (503.32 KB) | DOI: 10.37033/ojce.v1i2.114

Abstract

Permasalahan dalam pembelajaran kimia yaitu beragam pemahaman siswa terhadap suatu materi, siswa kurang memahami konsep kimia yang diajarkan. Tujuan penelitian ini untuk melihat hasil belajar siswa & menerapkan penuntun praktikum dengan menggunakan metode discovery learning. Instrumen yang digunakan dalam penelitian ini adalah lembar validasi penuntun praktikum. Teknik pengumpulan data menggunakan metode wawancara, observasi dan angket. Hasil validasi dari beberapa ahli yang terdiri dari tiga validator mununjukan bahwa penuntun praktikum berada pada kategori valid dengan presentasi 86,84 . Berdasarkan hasil penelitian dapat disimpulkan bahwa hasil belajar siswa yang menggunakan penuntun praktikum dengan menggunakan metode discovery learning mencapai nilai KKM dan 70% siswa melampaui nilai KKM ( Kriteria Ketuntasan Minimal) yang ditetapkan.
Pengaruh Penerapan Model Pembelajaran Inquiry Cycle 5E Berbantuan Praktikum Terhadap Hasil Belajar Siswa Pada Materi Konsep Redoks Elisabet Avilia Supit; Djefry Tani; Marlina Karundeng
Oxygenius Journal Of Chemistry Education Vol 2 No 2 (2020): 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.v2i2.178

Abstract

Tujuan dari penelitian ini adalah untuk mengetahui pengaruh penerapan model pembelajaran Inquiry Cycle 5E berbantuan praktikum terhadap hasil belajar siswa pada materi konsep redoks. Populasi penelitian yaitu seluruh siswa kelas X MIPA SMA Negeri 1 Tomohon, dan sampel pada penelitian ini yaitu X MIPA 1 sebagai kelas kontrol dan X MIPA 2 sebagai kelas eksperimen. Desain yang digunakan pada penelitian ini adalah Nonequivalent Control Group Design. Pengujian normalitas menggunakan uji chi kuadrat, menunjukkan data kedua kelas berdistribusi normal, dan pengujian homogenitas menggunakan uji kesamaan varian, menunjukkan varian kedua kelas homogen. Pengujian hipotesis dengan uji-t pooled varian diperoleh thitung = 4.07 > ttabel = 2.00, maka H1 diterima yaitu nilai rata-rata hasil belajar kelas eksperimen lebih besar dari nilai rata-rata hasil belajar kelas kontrol. Dari hasil tersebut dapat disimpulkan bahwa terdapat pengaruh pada hasil belajar siswa karena penerapan model pembelajaran Inquiry Cycle 5E berbantuan praktikum pada materi konsep redoks
Pengaruh Penerapan Model Kooperatif Tipe Teams Assisted Individualization (TAI) Disertai Praktikum Terhadap Hasil Belajar Siswa Pada Materi Ikatan Kimia Jeivana Laluas; Djefry Tani; Abdon Saiya
Oxygenius Journal Of Chemistry Education Vol 3 No 1 (2021): 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.v3i1.240

Abstract

This study aims to determine the effect of the implementation of the Teams Assisted Individualization (TAI) cooperative model with practicum on learning outcomes. This study used an experimental method, with a posttest only control design. The population was students of class X IPA and the sample of class X IPA 2, amounting to 26 people as the experimental class and class X IPA 1, totaling 26 people as the control class. The results of the research were analyzed by using the hypothesis (t-test) and the tcount was 1.778> t table 1.67. From these data, it can be influence the application of the cooperative model type TAI along with practicum on student learning outcomes in chemical bonding material.
Co-Authors Abdon Saiya Astrid Magritha Singal Dokri Gumolung Elisabet Avilia Supit Istiani Astari Nanangkong Jeanne M. Tuerah Jeivana Laluas Jenifer Alfonda Walewangko Joice Dorsila Susana Caroles Marlina Karundeng Olivia Indra Moray Rivya Tamungku Rymond Jusuf Rumampuk Wilson Rombang