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Jurnal Akademika Kimia
Published by Universitas Tadulako
ISSN : 24775185     EISSN : 23026030     DOI : -
Core Subject : Science, Education,
Chemistry Education
Jurnal Akademika Kimia is an electronic open-access journal that aims to publish the latest research results in the area of chemistry education and pure chemistry from academicians, professionals, and other practitioners at all levels of chemistry education. The journal coverage includes the following: current trends of professional chemistry education, educational technology, teacher education, educational science, learning assessment, learning models and development of learning materials, as well as pure chemistry including organic chemistry, inorganic chemistry, analytical chemistry, physical chemistry, biochemistry and other chemistry fields such as environmental chemistry, that emphasis on a broad description of the general methods and processes for the synthesis, modification, and characterization of chemical materials.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 201 Documents
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Analysis of Carotene in Biscuits made from Yellow Pumpkin Flour (Cucurbita moschata Durch) at Various Heating Temperatures Yuldayani; Supriadi
Jurnal Akademika Kimia Vol. 12 No. 3 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i3.pp160-165

Abstract

Yellow pumpkin (Cucurbita moschata Durch) is one of the food ingredients rich in dietary fibers, especially pectin, bioactive compounds, beta carotene, vitamin A, tocopherol, other vitamins including B6, K, C, thiamine, and riboflavin, as well as several types of minerals (K, P, Mg, Fe, and Se). This study aimed to determine the carotene retention of biscuits made from pumpkin flour (Cucurbita moschata Durch) at various heating temperatures. This study's stages included preparing pumpkin flour and biscuits, carotene content, and carotene retention analysis from various heating temperatures. Determination of carotene retention using a UV - Vis spectrophotometer. The results showed that the roasting temperature influenced carotene retention in the preparation of biscuits. Biscuits with retention of 86 % were found at a temperature of 190 oC. The lowest carotene retention of 79 % was found at a roasting temperature of 210 oC.
Determination of the Content of Nitrogen (N), Phosphorus (P), and Potassium (K) in Pellets from Cakalang fish (Katsuwonus pelamis) Waste Fermented Using Adhesives From Broiler Chicken Feces Safitri, Iin; H. Abram, Paulus
Jurnal Akademika Kimia Vol. 12 No. 3 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i3.pp166-169

Abstract

Fish offal and broiler faeces are underutilised organic waste; the purpose of this study was to determine the levels of nitrogen (N), phosphorus (P) and potassium (K) contained in the pellets from cakalang fish (Katsuwonus pelamis) waste fermented using adhesive from broiler chicken faeces. Nitrogen levels were determined using a colourimeter, phosphorus levels were determined using a UV-Vis spectrophotometer, and potassium levels were determined using a flame photometer. The results showed that the analysis of nitrogen, phosphorus, and potassium in the pellets from the fermentation of cakalang fish waste obtained an average of 4.2 %, 2.21 %, and 3.85 %, respectively.
Characteristics of Critical Thinking Skills of Class XI Senior High School on Stoichiometry Material Devi, Sinta; Afadil, Afadil
Jurnal Akademika Kimia Vol. 12 No. 3 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i3.pp170-175

Abstract

This study aims to describe the characteristics of students’ critical thinking skills in the Stoichiometry material of class XI SMA Negeri 1 single. This type of research is descriptive quantitative. The sample of this research was all students of class XI SMA Negeri 1 Sindue, which consisted of 3 classes, namely class XI MIA 1, XI MIA 2, and XI MIA 3. The data in this study were obtained through a test of students' critical thinking skills in the form of essays with as many as five items. Three essential thinking indicator items are interpretation, analysis, and inference. The results of data analysis for students' critical thinking skills for indicators of interpretation, analysis, and inference showed that class XI MIA 1 obtained the percentage results for the interpretation indicator 40,5 % in the low category, the analysis indicator obtained by the percentage of 35 % was included in the low category, and indicator inference obtained a percentage of 17 % who are in the very low category. Class XI MIA 2 obtained the percentage result on the interpretation indicator 46 %, which is in the low category. In comparison, the analysis indicator obtained a percentage of 59.5 % who are in the low category, and indicators inference obtained a percentage of 25,5 % who are in the low category. Whereas in class XI MIA 3, the percentage of interpretation indicators was 44 % in the low category, the analysis indicators obtained a percentage of 57,5 % who were in the low category. The inference indicator obtained 23,5 % who were in the very low category. Based on the research results at these schools, it can be seen that the critical thinking skills of class XI students of SMA Negeri 1 Sindue are still very low.
Determination of Citric Acid Level in Starfruit (Averrhoa bilimbi L.) and Starfruit Raisins Sri Rahayu; Nuryanti, Siti
Jurnal Akademika Kimia Vol. 12 No. 3 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i3.pp182-185

Abstract

Citric acid is one of the plants in Indonesia that has many benefits in various fields, especially in the industry. This study aims to determine the levels of citric acid in starfruit (Averrhoa Bilimbi L.) and starfruit raisins in Oti Village, Sindue Tobata District, Donggala Regency. The analytical method used to determine the levels of citric acid is alkalimetric titration. The sample used in this study came from Oti Village, Sindue Tobata District, Donggala Regency. The percentage results showed that the levels of starfruit citric acid were 6.363 %, and the starfruit raisins were 4.703 %.
Analysis of Potassium (K) and Calcium (Ca) in Durian Seeds (Durio Zibethinus Murr) Fahira, Gita; Said, Irwan
Jurnal Akademika Kimia Vol. 12 No. 3 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i3.pp186-191

Abstract

Durian seeds are one of the wastes from durian fruit that has not been optimally utilized due to the community's lack of knowledge and creativity regarding the processing of waste into food that has economic value. This reduces the accumulation of durian seed waste that can pollute the surrounding environment. Durian seeds benefit from being used as food because they are rich in minerals, especially potassium and calcium. This study aims to determine the levels of potassium and calcium contained in durian seeds. Determination of potassium and calcium levels using atomic absorption spectrophotometer (SSA). Potassium levels were analyzed at a wavelength of 766.8 nm, and calcium was investigated at 423 nm. Before the potassium and calcium levels were determined, the moisture content and ash content were first defined in the sample. The results of the analysis of moisture in the sample obtained 2.182 % and ash content of 12.633 %. Further analysis of potassium obtained average results for potassium of 612.605 mg / 100 g and an average for calcium of 15.555 mg / 100 g. The results of this study are expected to be a source of information about potassium and calcium levels in durian seeds. They can be further utilised as an alternative food based on durian seeds, especially in the Parigi Moutong area, Central Sulawesi.
Application of Snowball Throwing Model in Science Subjects on Student Learning Outcomes at Junior High School Mawaddah , Hayyatun; M.P Alibasyah, Lestari
Jurnal Akademika Kimia Vol. 12 No. 3 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i3.pp192-198

Abstract

This study aimed to describe the effectiveness of the snowball-throwing learning model in improving student learning outcomes in science subjects in junior high school. This quantitative descriptive research uses an experiment method and pretest-posttest one-group design. The research population was all VIII class students of Junior high school, 19 Palu in the 2022 / 2023 school year, totalling 107 people, with a research sample of VIII A class totalling 31 people. The sample was determined using a non-probability sampling technique, a simple random sampling method. The research instrument consisted of an evaluation test and a teaching observation sheet. Data analysis was carried out using non-parametric statistics and the Wilcoxon signed rank test to test the hypothesis of pretest and posttest data. At the same time, the data from the student activeness observation sheet was carried out descriptively per cent. As for determining the effectiveness of the learning carried out, using the N - Gain test. The pretest and posttest data analysis results obtained a significant probability value < α (0.05). Thus, it can be stated that the proposed research hypothesis is accepted, and it can be noted that the snowball-throwing learning model is efficacious in improving student learning outcomes. Gain test results show that the efficacy of snowball throwing learning is high with an N - -gain value of 0.8, with an N score of 80 % in the practical category. This achievement is supported by the observations of student activeness, with a percentage of 81.8 % in the outstanding category. It can be concluded that the snowball-throwing learning model effectively improves student learning outcomes in science subjects at Junior high school 19 Palu.
Examining Student Conception of Reaction Rate Through Three-Tier Multi-Representation Assessments Magfirah, Magfirah; Alimuddin, Chatifah; Santoso, Tri; Afadil, Afadil; S. Ahmar, Dewi; Rahmawati, Sitti
Jurnal Akademika Kimia Vol. 12 No. 3 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i3.pp199-204

Abstract

This study aims to analyze students' conceptions of reaction rate topics using the three-tier multi-representation test. Based on the characteristics of reaction rates concepts that involve the understanding of multiple representations, it is essential to analyze student conceptions that include multiple representations, namely macroscopic, microscopic, and symbolic. A three-tier diagnostic test can be done to assess students' conceptions, with the questions given in the first tier presented with macroscopic, microscopic, or symbolic representations according to the characteristics of the concept in question. This research uses a descriptive quantitative method conducted at Madrasah Aliyah Negeri 2 in Palu City, Central Sulawesi. The subjects of this study were 50 students consisting of 28 female students and 22 male students. It was determined by random sampling technique. Instrumentation used a three-tier representation test with 15 multiple-choice questions. Validation of instruments showed that the questions were feasible and fell into the high category. The findings reveal that only 29 % of students know the concept, categorized as low. Additionally, 40 % of students were identified as having misconceptions, placing them within the medium category, while 31 % of students exhibited not knowing the concept, also classified in the medium category. Symbolic representation emerged as the most challenging representation for students, with 35 % failing to comprehend it, categorized as medium. Furthermore, among students with misconceptions, symbolic and macroscopic representations were the most problematic, collectively accounting for 34 %, also classified as medium. These results underscore the need for targeted instructional strategies to address specific areas of difficulty and improve overall conceptual understanding.
Improving Student Learning Outcomes by Applying the Discovery Learning Model to the Acid-Base Titration Material of Senior High School Patilima, Yunarti; Nuryanti , Siti
Jurnal Akademika Kimia Vol. 12 No. 4 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i4.pp205-209

Abstract

The acid-base titration topic has links between concepts, equations of reactions, and calculations. Therefore, the lack of mastery related to this topic will affect the low learning outcomes. This study aimed to improve student learning outcomes on the acid-base titration topic by applying the discovery learning model. The sample of this study was students of class XI MIPA SMA Negeri 5 Palu, consisting of class XI MIPA 5 as experimental class 1 (n = 35) and class XI MIPA 6 as experimental class 2 (n = 33). The effectiveness of applying the discovery learning model can be seen from the average N-gain value in the experimental class. For experimental class 1, the average N-gain value was 0.67, which is included in the medium category. While the experimental class 2 was 0.63, which is included in the medium category. Based on the results of data analysis, the average value of student learning outcomes for experimental class 1 was 76.42 and experimental class 2 was 75.3. This value was greater than the average student learning outcomes before the treatment, which were 65. So it can be concluded that applying the discovery learning model can improve students’ learning outcomes in class XI MIPA on acid-base titration topics in SMA Negeri 5 Palu.
Analysis of Learning Difficulties of Students Class XI in Chemistry Subjects Hikma, Hikma; Suherman, Suherman
Jurnal Akademika Kimia Vol. 12 No. 4 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i4.pp210-215

Abstract

This study aimed to determine (1) the internal factors that cause learning difficulties in chemistry subjects for students of class XI MIA SMA Negeri 1 Tinombo Selatan, including attitudes towards learning, motivation, interest, and health; (2) the external factors that cause learning difficulties for class XI students of SMA Negeri 1 Tinombo Selatan include family, school, and community environment. This research was descriptive. The research subjects were 92 students. The collection technique used a questionnaire on the factors of learning difficulties. The data analysis technique used was descriptive with a percentage. The results showed that (1) the internal factors that caused learning difficulties were as follows: the attitude indicator towards learning was 16.44 %, the motivation indicator was 13.45 %, the interest indicator was 18.26 %, and the health indicator was 18.88 %. (2) External factors that cause learning difficulties are the family indicator was 23.23 %, the school indicator was 87.77 %, while the community indicator was 25.16 %.
Analysis of the Critical Thinking Skills of Students in Senior High School in Solving the Reaction Rate Problem Ramadhan , Moh. R.; Ijirana, Ijirana
Jurnal Akademika Kimia Vol. 12 No. 4 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i4.pp216-220

Abstract

This study aimed to obtain a description of the critical thinking skills of SMA Negeri 3 Palu students in solving reaction rate problems. The type of research used is descriptive-quantitative, with the research design in the form of case studies. The research sample consisted of students of class XI IPA 1 to XI IPA 4 SMA Negeri 3 Palu, with 108 students. The research instrument used is a critical thinking skill test in the form of 6 questions, validated with a value obtained for expert validation of 3.72 and an average empirical validation value of 0.72. Data analysis is done by calculating the grades students get for each indicator of critical thinking skills, then grouping them by essential categories of thinking. According to Ennis, the indicators of critical thinking skills used in this study are to provide simple explanations, build basic skills, draw conclusions, provide further explanations, and set strategies and tactics. Based on the results of the research data analysis, the highest percentage of critical thinking skills for the five indicators used in a row, namely 37.04, 51.85, 61.11, 53.70, and 42.59 %. These results show that each student has different critical thinking skills. The percentage obtained is, on average, in the medium to high category. The results of this study show that the essential thinking skills of high school students of SMA Negeri 3 Palu, grade XI IPA, are in a good category.

Page 17 of 21 | Total Record : 201

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