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All Journal Jurnal Inovasi Teknologi Pendidikan Jurnal Ilmiah Berkala: Sains dan Terapan Kimia J-PEK (Jurnal Pembelajaran Kimia)
Burhanuddin Ronggopuro
Universitas Negeri Malang
Chemical Engineering, Chemistry & Bioengineering Chemistry Education

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Study of Formaldehyde Content in Different Types of Tofu Using Micro Scale Laboratory Based Visible Beam Spectrophotometry Atikah Atikah; Burhanuddin Ronggopuro
Jurnal Sains dan Terapan Kimia Vol 17, No 1 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i1.13948

Abstract

Microscale laboratory is an analytical technique that requires a little reagent and produces a little waste. One application of microscale laboratory is the analysis of formaldehyde content in tofu. Formaldehyde is one of the chemicals that is harmful to the body but is often misused as a food preservative in tofu. This study aims at determining the presence of formaldehyde in tofu using laboratory microscale-based Schiff reagents. The use of microscale laboratories is expected to reduce waste and support the implementation of green chemistry. The method used was a calibration curve using a series of standard solutions of 10 ppm, 15 ppm, 20 ppm, 25 ppm, and 30 ppm with scanning at a wavelength of 561 nm. In the qualitative test, all samples were reactive and showed a purplish red color. In the qualitative test, the highest formaldehyde content in the tofu sample was obtained in the white tofu 3 with a content of 99.7 ppm.
Analysis of the needs of teachers of SMAN 3 Sidoardjo in the creation and use of learning media Jacky Anggara Nenohai; Deni Ainur Rokhim; Zelen Surya Minata; Nur Indah Agustina; Kafita Krisnatul Islamiyah; Burhanuddin Ronggopuro; Habiddin Habiddin; Ristiwi Peni; Bambang Wahyudi; Asnan Wahyudi
Jurnal Inovasi Teknologi Pendidikan Vol 10, No 3 (2023): September
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jitp.v10i3.54691

Abstract

This study aims to analyze the needs of teachers of SMAN 3 Sidoardjo in the creation and use of learning media in the teaching and learning process. The research method used is descriptive qualitative by taking data through a Google form-based questionnaire filled out online. The subjects of the study were 51 teachers of SMAN 3 Sidoardjo. The results of the survey based on questionnaire data obtained showed that the learning media used by the teachers of SMAN 3 Sidoardjo in the teaching process was made by as much as 72.5% and 27.5% were not made by themselves, so the media was obtained from Youtube, Google, and colleagues. The media created by several teachers has obstacles, namely mastery of IT (editing and programming languages), a long time in the development process, and its use has not adjusted to the characteristics of students and unites several media and materials in one platform such as  Learning Management System. Therefore, teachers need training and direct assistance in making intensive and simple learning media without using programming languages, flexible time, and accessible anywhere and anytime. Website-based media to accommodate all the material and learning resources taught so that students can easily use the press and improve their understanding of the material and the quality of learning So that teachers and students can adjust the scope and face problems in the learning process by the demands of the times.
The Effect of the 5E Learning Cycle Model with Learning Journals on Students' Critical Thinking in Thermochemistry Burhanuddin Ronggopuro; Muntholib Muntholib; Aman Santoso; Jacky Anggara Nenohai
J-PEK (Jurnal Pembelajaran Kimia) Vol. 10 No. 2 (2025): J-PEK (JURNAL PEMBELAJARAN KIMIA)
Publisher : Department of Chemistry, Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Work in the 21st century demands strong critical thinking skills. However, high school students still exhibit relatively low levels of critical thinking ability. Integrating learning journals into the 5E Learning Cycle model represents an educational innovation that enhances these skills. This study compares the critical thinking abilities of students in experimental and control classes using a quantitative quasi-experimental design with a non-equivalent control group. Two classes were involved: an experimental group (35 students) and a control group (34 students), each receiving different treatments. The sampling technique used was simple random sampling. Data were collected using 10 questions based on Ennis's five aspects of critical thinking. The instrument was validated and showed a reliability coefficient of 0.725. The results showed a difference in critical thinking scores between the control and experimental classes. The experimental class, which used the 5E Learning Cycle model supported by learning journals, achieved higher outcomes. This was confirmed by an independent t-test, which yielded a p-value (<0.001) and a higher post-test mean score in the experimental class (26.05). A Cohen’s d value of 2.39 indicated a large effect size, while an N-Gain score of 0.95 showed that the intervention fell into the high category.
Co-Authors Aman Santoso Asnan Wahyudi Atikah Atikah Bambang Wahyudi Deni Ainur Rokhim Habiddin Jacky Anggara Nenohai Jacky Anggara Nenohai Kafita Krisnatul Islamiyah Muntholib Nur Indah Agustina Ristiwi Peni Zelen Surya Minata