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All Journal Prosiding Seminar Nasional MIPA Jurnal Pendidikan Indonesia Al-Kimia WIDYA LAKSANA Integrated Lab Journal Molekul: Jurnal Ilmiah Kimia Jurnal Inovasi Pendidikan Kimia
I Ketut Lasia
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Other

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Miller’s Pyramid as a Predictor of Undergraduate Students’ Practical Competence in Preventing Chemical Laboratory Accidents I Ketut Lasia; Ni Made Wiratini; I Ketut Budiada; I Gusti Ayu Nyoman Sri Wahyuni
Jurnal Inovasi Pendidikan Kimia Vol. 19 No. 2 (2025): Jurnal Inovasi Pendidikan Kimia
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jipk.v19i2.16490

Abstract

Preventing accidents in chemistry laboratories is a critical concern, as laboratory activities involve chemical hazards, equipment risks, and procedural errors. One of the main contributing factors to laboratory accidents is inadequate student competence during practical activities. However, systematic predictors for assessing practicum competence are still rarely implemented. This study aims to examine the effectiveness of Miller’s Pyramid as a predictor of students’ practicum competence in preventing work-related accidents in chemistry laboratories. The research employed a descriptive evaluative design. The participants consisted of students from the Chemistry Department who were involved in laboratory practicums. The object of the study was students’ practicum competence based on the four levels of Miller’s Pyramid: knows, knows how, shows, and does. Data were collected through written tests, interviews, and direct observations using structured assessment rubrics. The collected data were analyzed descriptively and presented in percentage form. Student competence was categorized as good when at least 70% of the indicators at each Miller’s Pyramid level were achieved. The results showed that students’ competence at all levels of Miller’s Pyramid met the established criteria, indicating good overall practicum competence. Furthermore, the findings demonstrate that Miller’s Pyramid can effectively function as a predictor of students’ practicum competence related to laboratory safety. In conclusion, the application of Miller’s Pyramid provides a comprehensive framework for assessing and improving student competence, thereby contributing to the prevention of work accidents in chemistry laboratories
Carbon Electrode and Buleleng Seawater in Degrading the Leachate in Bengkala Village of Buleleng Regency by Using Electro-Oxidation Techniques Wiratini, Ni Made; Lasia, I Ketut; Rakhman, Khusna Arif; Cipta, Indra
Molekul Vol 21 No 1 (2026)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2026.21.1.12130

Abstract

ABSTRACT. This research aims to study the effectiveness of using carbon electrodes and Buleleng seawater in degrading leachate through electro-oxidation techniques. Electro-oxidation is a waste processing technology that cannot be biologically degraded, has high efficiency and degradation speed, is easy to operate, has low cost, and is environmentally friendly. Leachate is taken from the dumping ground in Bengkala village of Buleleng Regency. The volume of leachate used was 50 mL. The influence of the surface area of the electrode, the distance between electrodes, voltage, contact time, and the amount of seawater were also studied. All treated leachates were then measured for COD, DO, absorbance, BOD, and pH. The results showed that Buleleng sea water contains chlorine ions 16.862 g/L. COD, DO, absorbance, BOD, and pH of leachate before electro-oxidation 38.763x103, 0, 17.1, 0, and 9 mg/L respectively. The surface area of the electrodes, the distance between electrodes, voltage, contact time, and the amount of seawater used were most effective in degrading leachate in 10.551 cm2, 3 cm, 13.5 volts, 1.5 hours, and 560 mL respectively. Keywords: Buleleng seawater, carbon electrodes, degrading leachate, electro-oxidation technique
Co-Authors Cipta, Indra I Gusti Ayu Nyoman Sri Wahyuni I Ketut Budiada I Made Gunamantha I Nyoman Sujana I Wayan Suja Khusna Arif Rakhman, Khusna Arif Ni Made Wiratini