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Hydrogen: Jurnal Kependidikan Kimia
Published by Universitas Pendidikan Mandalika
ISSN : 23386487     EISSN : 26563061     DOI : Prefix 10.33394
Core Subject : Science, Education,
Chemistry Education
Hydrogen: The Chemistry Education Journal published by the Chemistry Education Study Program which contains articles raised from the results of conceptual research and studies in chemistry and chemistry education including education and learning, device development, media and learning models.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 16 Documents
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Search results for , issue "Vol 12, No 2 (2024): April-May 2024" : 16 Documents clear
Cytotoxic Activity of Gude Leaves (Cajanus cajan) using The Brine Shrimp Lethality Test (BSLT) Method Emelda, Andi; Hasnaeni, Hasnaeni; Ulfa, Amanda
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 2 (2024): April-May 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i2.11077

Abstract

Gude Leaves (Cajanus cajan) are a traditional medicinal plant for treating diarrhea. The ingredients contained in Gude leaves are flavonoids, such as kajanol, quarcetin and luteolin and also contain other secondary metabolites, tannins, saponins, alkaloids, terpenoids and phenols. Scientifically, Gude leaves have antimalarial, antidiabetic, anthelmintic, antioxidant, antibacterial and anticancer activity. This research aims to determine the toxicity of gude leaves (C. cajan) using the Brine Shrimp Lethality Test (BSLT) method. This research began by carrying out two extraction methods, namely maceration and UAE (Ultrasonic Assisted Extraction) on samples of gude leaves using 70% ethanol solvent. Then a phytochemical screening was carried out which showed that samples of gude leaves contained alkaloids, flavonoids, steroids, saponins and tannins. Experimentation the toxicity of gude leaf extract using maceration and UAE methods on Artemia Salina Leach larvae, each divided into 5 test groups, namely 4 treatment groups (concentrations of (250 ppm,  LC=23,33% & 33,33%) ; (500 ppm, LC= 56,67% & 60%); (750 ppm, LC= 70% & 73%); and (1000 ppm, LC= 80%) and 1 positive control group (sea water ). The research results can be seen through probit analysis by calculating the LC50 value. The LC50 value of gude leaf extract using the maceration method was 242.52 and the result of gude leaf extract using the UAE method was 394.16 (Toxic).  This research provides information regarding the toxic effects of gude leaf extract.
Documentary Video Media Development on Food Additives Sabdaningtyas, Katherina; Hairida, Hairida; Rasmawan, Rahmat; Masriani, Masriani; Hadi, Lukman
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 2 (2024): April-May 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i2.10846

Abstract

In this era, technology is advancing and developing rapidly. Almost every minute or even second we are in direct contact with technology. In today's world of education, it is also inseparable from the role of technology. Students who on average have good technological literacy tend to get bored more quickly when learning runs conventionally. Regarding the function of learning media, it can be emphasized as follows: as a tool to streamline learning, accelerate the teaching and learning process, and improve the quality of the teaching and learning process. The purpose of this research is to produce a documentary video about food additives that is expected to be utilized for ease of learning. The method used in this research is research and development developed by Borg and Gall. This documentary video media development procedure goes through stages, namely: (1) Research and information gathering, (2) Product development planning, and (3) Initial Product Development. Data or information collection techniques using literature studies and field studies. Stages of video development by creating a storyboard using a video editor application. The next stage of learning videos is validated or evaluated by experts.  This Documentary Video validation analysis uses descriptive methods through questionnaires. The results of the validation of this Documentary Video obtained an average score of 3.5 by entering the valid category. It can be concluded that this Video Documentary is suitable for use and can be followed up by looking at student responses.
Development of Student Worksheet Based on Project Based Learning on Mixed Separation Material at SMKN 7 Pontianak Purba, Nasriani; Harun, Andi Ifriany; Ulfah, Maria; Enawaty, Eny; Rasmawan, Rahmat
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 2 (2024): April-May 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i2.10861

Abstract

Chemistry learning in schools still tends to be teacher-centered, so students have limitations in connecting subjects to real life. The material on the mixed separation related to basic competence skills will be achieved through chemical experiments, but there is no chemical laboratory in schools. The learning activities only use textbooks borrowed from the library, so there is a need for other teaching materials that can help students to carry out chemistry experiments in the form of PjBL based Student Worksheet (LKPD) on separating mixed. The aim of this research is to asses the feasibility of PjBL based LKPD in mixed separation and determine the responses of students and teachers. Research and development (R&D) uses the ADDIE model, but this research only reaches the development stage. The subjects in this study were PjBL-based worksheets on mixed separation materials which were tested on a limited basis (15 students) and a large scale (35 students) at State Vocational High School (SMKN) 7 Pontianak. Data collection techniques used are direct communication techniques and indirect communication. Data collection tools are interview guides, feasibility assessment sheets, student and teacher response questionnaires. The expert assessment using the Gregory test showed that the criteria were very feasible,  with a very high validity value of 1.00 for content, presentation, graphics and language aspects. The response test results with limited and extended trials obtained an average percentage of 85% and 86% respectively, and the response test results for 3 teachers obtained an average percentage of 88%. The results of the assessment indicate that the PjBL-Based Student Worksheet (LKPD) is very suitable for use in supporting chemistry experiments on mixed separation material in learning activities.
The Effect of Problem-Based Learning Model on Students’ Learning Outcomes Viewed from Learning Styles Arni, Kurnia Julianti; Kosim, Kosim; Verawati, Ni Nyoman Sri Putu
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 2 (2024): April-May 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i2.11788

Abstract

This study explores the effectiveness of the Problem-Based Learning (PBL) model on students' learning outcomes, focusing on how different learning styles—visual, auditory, and kinesthetic—affect its efficacy. Conducted at SMA Negeri 1 Narmada, the research employed a quasi-experimental design with a pretest-posttest nonequivalent control group setup to measure the impacts of PBL versus traditional teaching methods. Findings from the study revealed significant improvements in the physics learning outcomes for the experimental group, which engaged with the PBL model, compared to the control group that used conventional direct instruction methods. Statistical analysis using a two-way ANOVA showed a significant enhancement in learning outcomes associated with the PBL model (p = 0.030), but no significant interaction between learning styles and the learning model was found, indicating that the PBL model benefits all learning styles equally without preference. These results suggest that while PBL universally improves learning outcomes, individual learning styles do not significantly alter its effectiveness. The study highlights the potential of PBL to not only increase academic performance in physics but also to foster a more engaging and participatory learning environment. It underscores the importance of adopting educational models that accommodate diverse learning preferences and provide dynamic, student-centered learning experiences. This research contributes to the understanding of instructional effectiveness and supports the broader implementation of PBL in physics education to cater to varied educational needs and learning styles.
Development of Guided Inquiry Oriented with Chemical Representations e-Worksheets to Train Science Process Skills on Chemical Equilibrium Putri, Robertha Febriana; Novita, Dian
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 2 (2024): April-May 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i2.11146

Abstract

Chemistry learning, namely chemical equilibrium material, is considered less easy to understand for students because they are less able to represent mutiples of chemical representations, and science process skills are low. This problem was found referring to the results of a pre-research questionnaire of students and interviews with high school teachers in Surabaya. Overcoming this, learning media that helps students understand the material according to the characteristics of students is needed. The purpose of this research is to produce a product in the form of Student worksheet electronic that is feasible to develop on chemical equilibrium material. The method used is research and development with the 4D model which consists of defining, designing, developing, and disseminating stages. This research was only conducted up to the development stage. Student worksheet electronic on chemical equilibrium material was tested on students of class XI-5 SMA Negeri 3 Surabaya who had studied chemical equilibrium material was the subject of this study. This research instrument is in the form of a review sheet, validation sheet, student response questionnaire sheet, observation sheet, test sheet. This research produces guided inquiry Student worksheet electronic media oriented to multiple chemical representations on chemical equilibrium material. The results of Student worksheet electronic validation from the aspects of content validity and construct validity, each obtained a mode of 4 so that it is very valid to use. The results of the student response questionnaire reached an average of 88.3% positive response with a very practical category. The results of pretest and posttest data analysis obtained an increase in science process skills as much as 80% of students get a high criteria n-gain score. It is concluded that the guided inquiry Student worksheet electronic oriented to multiple chemical representations on chemical equilibrium material is feasible to use to train students' science process skills.
Determination of Total Tannin Content from Methanol Extracts of Various Species of Ferns (Pteridophyta) Hariyanti, Weni; Masriani, Masriani; Sasri, Risya; Sapar, Ajuk; Erlina, Erlina; Ersando, Ersando
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 2 (2024): April-May 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i2.11597

Abstract

AbstractThe use of heavy-metal mordants in fabric dyeing is prohibited due to the resulting impacts such as environmental damage and public health, therefore environmentally friendly and non-toxic mordants such as tannin mordants (biomordants) are needed. Based on phytochemical screening on fern species (Pteridophyta), it is known that they contain tannins. However, scientific evidence of determining the total tannin content of various species of ferns has so far not been found. This study aims to determine the yield and total tannin content of methanol extracts of five fern species, namely paku kawat (Lycopodium cernuum), paku resam (Gleichenia linearis), paku dayak (Blechnum orientale), paku uban (Nephrolepis biserrata), paku miding (Stenochlaena palustris). Sample extraction was carried out by maceration method using methanol solvent. Extract yield was determined by weighing method. Analysis of total tannin content was carried out by UV-Vis spectrophotometric method at a wavelength of 755.8 nm using Folin-Ciocalteu reagent and sodium carbonate. The results of the research obtained the yield of methanol extracts on paku kawat, paku resam, paku dayak, paku uban, and paku miding are 11.271%; 8.389%; 4.810%; 3.615%; and 0.854%, respectively. Total tannin levels in methanol extracts of paku kawat, paku resam, paku dayak, paku uban, and paku miding were 0.024% ± 0.002; 0.256% ± 0.029; 0.272% ± 0.037; 0.143% ± 0.019; and 0.022% ± 0.012, respectively. Based on these data, it can be concluded that the methanol extract of paku kawat produces the highest yield while paku dayak produce the highest total tannin content. The results indicate that differences in fern species cause differences in tannin levels.  

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