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All Journal Fullerene Journal of Chemistry Oxygenius Journal Of Chemistry Education
John Z Lombok
Universitas Negeri Manado
Chemistry Education

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Karakterisasi Asap Cair Hasil Pirolisis Sampah Kantong Plastik sebagai Bahan Bakar Bensin I Dewe Ketut Anom; John Z Lombok
Jurnal Kimia Fullerene Vol 5 No 2 (2020): 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.v5i2.206

Abstract

Plastic bag waste is garbage that is difficult to degrade in nature. Hoarding plastic bag waste can reduce soil fertility because it cannot be broken down by microorganisms quickly. Burning plastic bag waste can produce toxic gases and have a negative impact on human health and the environment. To solve the problem, the plastic bag waste is converted into liquid smoke as fuel oil. The method used to convert the plastic bag waste into liquid smoke is pyrolysis. The fractionation of liquid smoke at temperatures below 200oC produces 36.20% clear liquid which has similar properties to gasoline fuel. Characterization of the physical and chemical properties of the gasoline fraction liquid smoke has a density of 0.76 g/mL; a viscosity of 0.80 cP; boiling point at 146.9oC; flash point at 30.60oC; a calorific value of 10,520 cal/g; with the octane number of 98 RON. GC-MS analysis shows that the gasoline fraction liquid smoke consists of 45 chemical compounds which can be classified into alkanes, alkenes, cycloalkanes and alcohols.
Identifikasi struktur kognitif siswa dengan menggunakan peta konsep pada larutan asam-basa Bela Ganda; John Z Lombok; Jenny Kumajas
Oxygenius Journal Of Chemistry Education Vol 1 No 1 (2019): Oxygenius : Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (181.557 KB) | DOI: 10.37033/ojce.v1i1.72

Abstract

Every student has different cognitive structures, but few teachers realize these differences. The purpose of this research is to identify students’ cognitive structures, which comprise of several aspects such as content, students’ prior knowledge, new knowledge and misconception when they learn from a concept map. The method used is descriptive research, conducted on 18 students at a senior high school in Manado City. The students’ cognitive structures are revealed using questions from concept map about acid-base solution. The cognitive structures are identified based on the scores obtained by each students from the concept map questions. The result shows three cognitive categories of students on the content aspect, namely poor, good, and excellent, and three categories of students’ cognitive structures, which are students’ prior knowledge, new knowledge and misconception. In general, the students’cognitives structure are categorized as good.
Co-Authors Bela Ganda I Dewe Ketut Anom Jenny Kumajas