Pub Date : 2023-12-30DOI: 10.24114/jpkim.v15i3.49009
Nora Susanti, J. Purba, M. Nizam, Cindy Agnesia, Astri Devi Br. Pakpahan
Deodorant is a cosmetic preparation used by the wider community to control and reduce body odor. Deodorant act as antibacterial and are able to reduce the excretion of sweat in the armpits. Frankincense is a plant that contains flavonoids and tannins can act as antibacterial. This aim of this study was to determine the effectiveness of frankincense sap extract as an antibacterial in deodorant spray preparation. Frankincense sap powder is macerated with ethanol to obtain frankincense sap extract. Deodorant formulations are prepared from frankincense sap extract in various concentrations (5%, 10%, 15%, 20%, 25%) and combined with cosolvent, emollient, and solvent. Tests carried out include antibacterial testing against Pseuodomonas aureugenisa and Staphylococcus epidermidis bacteria, organoleptic test, pH test, viscosity test, and irritation test. The test results showed that antibacterial testing gave the highest inhibitory diameter of 2.63 mm and 5.35 mm which was exhibited by formulation 5.
{"title":"Formulation and antibacterial activity of frankincense sap extract deodorant spray (Styrax benzoin)","authors":"Nora Susanti, J. Purba, M. Nizam, Cindy Agnesia, Astri Devi Br. Pakpahan","doi":"10.24114/jpkim.v15i3.49009","DOIUrl":"https://doi.org/10.24114/jpkim.v15i3.49009","url":null,"abstract":"Deodorant is a cosmetic preparation used by the wider community to control and reduce body odor. Deodorant act as antibacterial and are able to reduce the excretion of sweat in the armpits. Frankincense is a plant that contains flavonoids and tannins can act as antibacterial. This aim of this study was to determine the effectiveness of frankincense sap extract as an antibacterial in deodorant spray preparation. Frankincense sap powder is macerated with ethanol to obtain frankincense sap extract. Deodorant formulations are prepared from frankincense sap extract in various concentrations (5%, 10%, 15%, 20%, 25%) and combined with cosolvent, emollient, and solvent. Tests carried out include antibacterial testing against Pseuodomonas aureugenisa and Staphylococcus epidermidis bacteria, organoleptic test, pH test, viscosity test, and irritation test. The test results showed that antibacterial testing gave the highest inhibitory diameter of 2.63 mm and 5.35 mm which was exhibited by formulation 5.","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":" 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139138712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-30DOI: 10.24114/jpkim.v15i3.48748
Jajang Muhariyansah, Hari Sutrisno, Fajar Naqsyahbandi
Learner self-efficacy is the confidence of a learner to determine how he feels, thinks, motivates and behaves. The purpose of this study was to analyze the instrument of self-efficacy assessment of students in the Aliyah madrasah in Musi Rawas Prov. South Sumatra. The total of respondents to testing this instrument was 234 students. This study uses Second Order Confirmatory Factor Analysis (CFA) to determine the validity and reliability of Likert scale instruments regarding students' self-efficacy in chemistry learning. The sampling technique used is proportionate Stratified Random Sampling. The research results show that the instrument developed has good construct validity as seen from the loading factor value > 0.50. The construct reliability test using CR and AVE values also showed acceptable results so it was declared suitable for use in data collection to measure self-efficacy in learning chemistry. It is hoped that teachers can measure student self-efficacy using this instrument. It is expected that teachers can measure students' self-efficacy using this instrument.
{"title":"Self-efficacy assessment in chemistry learning: Development and validation using confirmatory factor analysis","authors":"Jajang Muhariyansah, Hari Sutrisno, Fajar Naqsyahbandi","doi":"10.24114/jpkim.v15i3.48748","DOIUrl":"https://doi.org/10.24114/jpkim.v15i3.48748","url":null,"abstract":"Learner self-efficacy is the confidence of a learner to determine how he feels, thinks, motivates and behaves. The purpose of this study was to analyze the instrument of self-efficacy assessment of students in the Aliyah madrasah in Musi Rawas Prov. South Sumatra. The total of respondents to testing this instrument was 234 students. This study uses Second Order Confirmatory Factor Analysis (CFA) to determine the validity and reliability of Likert scale instruments regarding students' self-efficacy in chemistry learning. The sampling technique used is proportionate Stratified Random Sampling. The research results show that the instrument developed has good construct validity as seen from the loading factor value > 0.50. The construct reliability test using CR and AVE values also showed acceptable results so it was declared suitable for use in data collection to measure self-efficacy in learning chemistry. It is hoped that teachers can measure student self-efficacy using this instrument. It is expected that teachers can measure students' self-efficacy using this instrument.","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"178 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139140530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-30DOI: 10.24114/jpkim.v15i3.51153
Khomaini Hasan, Angga Himas Setyawan, Muhamad Abidin, Nurul Aida Fathya, Dewi Ratih Handayani, Desy Linasari, S. Silaban, T. Subroto, Muhammad Yusuf
Diabetes mellitus (DM) is a multifactorial disease defined by persistent hyperglycemia and impaired carbohydrate, lipid, and protein metabolism due to a lack of insulin secretion. The objective of this study was to assess the Indonesian herbs which have the ability to act as human salivary α-amylase inhibitors, thus, that they can be implemented for medical purposes. In this study, fifteen Indonesian herbs were assessed for their capability as α-amylase inhibitor. The water-reflux method was used to extract all potential water-soluble active components. The Fuwa technique was used to test α-amylase activity. There were significant variations in the effects of herbs on salivary α-amylase activity, according to the statistical using one-way ANOVA and Post Hoc Tukey between the with and without inhibitors. According to the findings, Turmeric (Curcuma longa L.) and pandan leaf (Pandanus amaryllifolius Roxb) had the highest inhibitory power (80%).
糖尿病（DM）是一种多因素疾病，由于缺乏胰岛素分泌，导致持续性高血糖以及碳水化合物、脂质和蛋白质代谢受损。本研究的目的是评估有能力作为人体唾液α-淀粉酶抑制剂的印尼草药，从而将其用于医疗目的。本研究评估了 15 种印尼草药作为α-淀粉酶抑制剂的能力。水回流法用于提取所有潜在的水溶性活性成分。采用福娃技术检测α-淀粉酶活性。根据单因素方差分析和后组Tukey统计，有抑制剂和无抑制剂的中草药对唾液α-淀粉酶活性的影响存在明显差异。研究结果表明，姜黄（Curcuma longa L.）和板蓝根叶（Pandanus amaryllifolius Roxb）的抑制率最高（80%）。
{"title":"Comparative assessment of human salivary α-amylase inhibitor from Indonesian herbs","authors":"Khomaini Hasan, Angga Himas Setyawan, Muhamad Abidin, Nurul Aida Fathya, Dewi Ratih Handayani, Desy Linasari, S. Silaban, T. Subroto, Muhammad Yusuf","doi":"10.24114/jpkim.v15i3.51153","DOIUrl":"https://doi.org/10.24114/jpkim.v15i3.51153","url":null,"abstract":"Diabetes mellitus (DM) is a multifactorial disease defined by persistent hyperglycemia and impaired carbohydrate, lipid, and protein metabolism due to a lack of insulin secretion. The objective of this study was to assess the Indonesian herbs which have the ability to act as human salivary α-amylase inhibitors, thus, that they can be implemented for medical purposes. In this study, fifteen Indonesian herbs were assessed for their capability as α-amylase inhibitor. The water-reflux method was used to extract all potential water-soluble active components. The Fuwa technique was used to test α-amylase activity. There were significant variations in the effects of herbs on salivary α-amylase activity, according to the statistical using one-way ANOVA and Post Hoc Tukey between the with and without inhibitors. According to the findings, Turmeric (Curcuma longa L.) and pandan leaf (Pandanus amaryllifolius Roxb) had the highest inhibitory power (80%).","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":" 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139140187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-30DOI: 10.24114/jpkim.v15i3.51492
R. Silaban, Osi Annauli Br Girsang, Roselva Theresia Manalu, Marham Sitorus, Simson Tarigan, Irving Josafat Alexander
The aim of this research is to obtain Android-based chemical bond learning media using the smart apps creator program that is feasible and eligible to use. To achieve the goal, development research has been carried out which refers to the 4 D model with the stages define, design, develop and disseminate. The research was conducted at SMA Negeri 5 Medan involving teachers and students of class X MIA. The research instruments used are non-test instruments including needs analysis instruments, feasibility test instruments and student response instruments. The research results are: (1). An Android-based chemical bond learning media has been obtained using a smart apps creator program with features main view, main menu, learning material, evaluation, summary and references. (2). The Android-based chemical bond learning media obtained was deemed suitable for use in learning with a feasibility level of 85.0% with very worthy category. (3). The students give good eligibility responded (82.6%) for the Android-based chemical bond learning media obtained with meets the requirements for use as learning media.
本研究的目的是利用智能应用程序创建程序获得基于安卓系统的化学键学习媒体，该媒体是可行的，并且符合使用要求。为了实现这一目标，我们采用了 4 D 模型，即定义、设计、开发和传播。研究在棉兰第五中学（SMA Negeri 5 Medan）进行，涉及第十班 MIA 的教师和学生。使用的研究工具为非测试工具，包括需求分析工具、可行性测试工具和学生反应工具。研究结果如下(1).使用智能应用程序创建程序获得了基于安卓系统的化学键学习媒体，该媒体具有主视图、主菜单、学习材料、评价、总结和参考文献等功能。(2).所获得的基于安卓系统的化学键学习媒体被认为适合用于学习，其可行性水平为 85.0%，属于非常值得使用的类别。(3).学生对所获得的基于安卓系统的化学键学习媒体给予了良好的评价（82.6%），符合作为学习媒体使用的要求。
{"title":"Preparing of chemical bonding learning media based android using smart apps creator program","authors":"R. Silaban, Osi Annauli Br Girsang, Roselva Theresia Manalu, Marham Sitorus, Simson Tarigan, Irving Josafat Alexander","doi":"10.24114/jpkim.v15i3.51492","DOIUrl":"https://doi.org/10.24114/jpkim.v15i3.51492","url":null,"abstract":"The aim of this research is to obtain Android-based chemical bond learning media using the smart apps creator program that is feasible and eligible to use. To achieve the goal, development research has been carried out which refers to the 4 D model with the stages define, design, develop and disseminate. The research was conducted at SMA Negeri 5 Medan involving teachers and students of class X MIA. The research instruments used are non-test instruments including needs analysis instruments, feasibility test instruments and student response instruments. The research results are: (1). An Android-based chemical bond learning media has been obtained using a smart apps creator program with features main view, main menu, learning material, evaluation, summary and references. (2). The Android-based chemical bond learning media obtained was deemed suitable for use in learning with a feasibility level of 85.0% with very worthy category. (3). The students give good eligibility responded (82.6%) for the Android-based chemical bond learning media obtained with meets the requirements for use as learning media.","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":" 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139140972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-08DOI: 10.24114/jpkim.v15i3.51211
Liana Vinca Rosea Cristy, Fransisca Ditawati Nur Pamenang
Learning about ethnoscience can help students better understand chemistry because it connects to their daily experiences. However, students often struggle with redox and electrochemical concepts due to a lack of appropriate learning materials and difficulty grasping these ideas. This research aims to achieve the following objectives: (1) develop ethnoscience-based student worksheets on redox reactions, Volta cells, and corrosion using Liveworksheets, following the 4D development model modified to 3D; (2) create ethnoscience-based student worksheets on these topics that are valid, effective, and practical. The research employed validation sheets and questionnaires as instruments, with a sample of six students from the 12th grade. Data was analyzed descriptively. The results indicate that (1) the modified 4D development model was suitable for creating the student worksheets due to its systematic stages and adaptability to researchers' needs; (2) both the media and material showed high validity percentages, averaging 88% and 89%, respectively. The worksheets were considered quite effective, with an average percentage of 66%, and practical, with an average percentage of 78%. Overall, the developed product can be effectively used to teach redox reactions, voltaic cells, and corrosion in chemistry using Liveworksheets.
{"title":"Development of ethnoscience-based student worksheets of redox reactions, volta cells, and corrosion using liveworksheets","authors":"Liana Vinca Rosea Cristy, Fransisca Ditawati Nur Pamenang","doi":"10.24114/jpkim.v15i3.51211","DOIUrl":"https://doi.org/10.24114/jpkim.v15i3.51211","url":null,"abstract":"Learning about ethnoscience can help students better understand chemistry because it connects to their daily experiences. However, students often struggle with redox and electrochemical concepts due to a lack of appropriate learning materials and difficulty grasping these ideas. This research aims to achieve the following objectives: (1) develop ethnoscience-based student worksheets on redox reactions, Volta cells, and corrosion using Liveworksheets, following the 4D development model modified to 3D; (2) create ethnoscience-based student worksheets on these topics that are valid, effective, and practical. The research employed validation sheets and questionnaires as instruments, with a sample of six students from the 12th grade. Data was analyzed descriptively. The results indicate that (1) the modified 4D development model was suitable for creating the student worksheets due to its systematic stages and adaptability to researchers' needs; (2) both the media and material showed high validity percentages, averaging 88% and 89%, respectively. The worksheets were considered quite effective, with an average percentage of 66%, and practical, with an average percentage of 78%. Overall, the developed product can be effectively used to teach redox reactions, voltaic cells, and corrosion in chemistry using Liveworksheets.","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"285 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139011113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-08DOI: 10.24114/jpkim.v15i3.50078
Ing Mayfa Br Situmorang, Feronika Evma Rahayu, Opi Dwi Nurhayati
Staphylococcus aureus can be found on the surface of the skin. One way to prevent Staphylococcus aureus on the skin is to clean the skin with soap. Liquid soap effectively removes dirt from the skin surface and protects the skin from bacteria. Determining the robusta green coffee bean extracts (Coffea canephora) appropriate activity was the study’s major aim in a liquid soap that complies with SNI 06-4085-1996 for use as an antibacterial agent and meets the physical quality requirements for liquid soap preparations. The extraction is performed by a soxhlet extraction method with 96% ethanol. The results of the organoleptic test show a difference in color at each concentration, with the concentration of the extract, which is higher, affecting the color and odor, the results of the homogeneity show results that are homogeneous and free of coarse grains, the results of the pH test show results that meet the requirements, namely in the interval 8-11, the results of the viscosity show results that meet the SNI requirements of 400-4000Cps, the results of the foam height test show stable results and meet the SNI requirements of 13-220 mm. the results of the inhibition zone in the liquid bath soap preparation of robusta green coffee bean extract using the disk diffusion method show that F0 = 4.51mm (resistant), F1 = 11.11mm (resistant), F2 = 13.35mm (intermediate) and F3 = 20.57mm (suspicious).
{"title":"Formulation and evaluation of liquid soap preparation of robusta green coffee extract (Coffea canephora) with virgin coconut oil (VCO) base as an antibacterial Staphylococcus aureus","authors":"Ing Mayfa Br Situmorang, Feronika Evma Rahayu, Opi Dwi Nurhayati","doi":"10.24114/jpkim.v15i3.50078","DOIUrl":"https://doi.org/10.24114/jpkim.v15i3.50078","url":null,"abstract":"Staphylococcus aureus can be found on the surface of the skin. One way to prevent Staphylococcus aureus on the skin is to clean the skin with soap. Liquid soap effectively removes dirt from the skin surface and protects the skin from bacteria. Determining the robusta green coffee bean extracts (Coffea canephora) appropriate activity was the study’s major aim in a liquid soap that complies with SNI 06-4085-1996 for use as an antibacterial agent and meets the physical quality requirements for liquid soap preparations. The extraction is performed by a soxhlet extraction method with 96% ethanol. The results of the organoleptic test show a difference in color at each concentration, with the concentration of the extract, which is higher, affecting the color and odor, the results of the homogeneity show results that are homogeneous and free of coarse grains, the results of the pH test show results that meet the requirements, namely in the interval 8-11, the results of the viscosity show results that meet the SNI requirements of 400-4000Cps, the results of the foam height test show stable results and meet the SNI requirements of 13-220 mm. the results of the inhibition zone in the liquid bath soap preparation of robusta green coffee bean extract using the disk diffusion method show that F0 = 4.51mm (resistant), F1 = 11.11mm (resistant), F2 = 13.35mm (intermediate) and F3 = 20.57mm (suspicious).","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"93 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139011566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-08DOI: 10.24114/jpkim.v15i3.50939
Saibun Sitorus, A. Khafifah Dwi Rachmat
A research was carried out on the feasibility of chemical and physical concentrations in coal mine excavation water for use in cage fisheries. This research aims to analyze the concentration conditions of chemical parameters (NH3, pH, Cu and Fe) and physical parameters (DO, temperature and turbidity) in water originating from coal excavations which are already in the form of lakes. Samples were prepared before analysis by adding concentrated nitric acid. Analysis of Cu and Fe concentrations was carried out using an Atomic Absorption Spectrophotometer (AAS), ammonia using a UV-Vis Spectrophotometer, DO concentrations were analyzed using the titration method, turbidity analysis using a nephelometer, temperature using a thermometer and pH using a pH meter. From the research results, it was found that the physical parameters of lake water from former coal mine excavations were pH, temperature, DO, NH3 and turbidity is suitable because it has not yet passed the quality standards for designation as a cage for cultivating freshwater fish. The concentration of the heavy metal Cu in coal excavation water has exceeded the quality standards set for cultivating freshwater fish and the metal concentration Fe has not exceeded the quality standards set. Research analysis of the average concentrations of heavy metals in water samples from former coal mining pools, namely Cu (0.166; 0.278; 0.284 mg/L), and Fe (0.020; 0.029; 0.023 mg/kg).
对煤矿采掘水的化学和物理浓度用于网箱渔业的可行性进行了研究。这项研究旨在分析已形成湖泊的煤矿采掘水的化学参数（NH3、pH 值、铜和铁）和物理参数（溶解氧、温度和浊度）的浓度条件。样品在分析前通过添加浓硝酸进行制备。使用原子吸收分光光度计分析铜和铁的浓度，使用紫外可见分光光度计分析氨的浓度，使用滴定法分析溶解氧的浓度，使用浊度计分析浊度，使用温度计分析温度，使用 pH 计分析 pH 值。研究结果表明，原煤矿采掘区湖水的物理参数为 pH、温度、溶解氧、NH3 和浊度，由于尚未通过指定为养殖淡水鱼网箱的质量标准，因此适合养殖淡水鱼。煤矿采掘废水中重金属 Cu 的浓度已经超过了淡水鱼养殖的质量标准，而金属 Fe 的浓度则没有超过规定的质量标准。研究分析了原采煤池水样中重金属的平均浓度，即 Cu（0.166；0.278；0.284 mg/L）和 Fe（0.020；0.029；0.023 mg/kg）。
{"title":"Feasibility study of concentration of chemical and physical parameters in excavated water coal mining as a cage fishing destination","authors":"Saibun Sitorus, A. Khafifah Dwi Rachmat","doi":"10.24114/jpkim.v15i3.50939","DOIUrl":"https://doi.org/10.24114/jpkim.v15i3.50939","url":null,"abstract":"A research was carried out on the feasibility of chemical and physical concentrations in coal mine excavation water for use in cage fisheries. This research aims to analyze the concentration conditions of chemical parameters (NH3, pH, Cu and Fe) and physical parameters (DO, temperature and turbidity) in water originating from coal excavations which are already in the form of lakes. Samples were prepared before analysis by adding concentrated nitric acid. Analysis of Cu and Fe concentrations was carried out using an Atomic Absorption Spectrophotometer (AAS), ammonia using a UV-Vis Spectrophotometer, DO concentrations were analyzed using the titration method, turbidity analysis using a nephelometer, temperature using a thermometer and pH using a pH meter. From the research results, it was found that the physical parameters of lake water from former coal mine excavations were pH, temperature, DO, NH3 and turbidity is suitable because it has not yet passed the quality standards for designation as a cage for cultivating freshwater fish. The concentration of the heavy metal Cu in coal excavation water has exceeded the quality standards set for cultivating freshwater fish and the metal concentration Fe has not exceeded the quality standards set. Research analysis of the average concentrations of heavy metals in water samples from former coal mining pools, namely Cu (0.166; 0.278; 0.284 mg/L), and Fe (0.020; 0.029; 0.023 mg/kg).","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"85 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139010962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-08DOI: 10.24114/jpkim.v15i3.50411
Iqlima Rahayu, W. Wiji, Galuh Yuliani, T. Widhiyanti, Sri Mulyani
Reaction rate is still considered difficult by students because it contains abstract concepts and mathematical equations, so students' mental models are not complete. To connect the three levels of representation in the process of addressing chemical problems, learning has to employ mental models as a whole. Therefore, this study aims to obtain students' mental models regarding the influence of reactants properties on reaction rates. This research uses a qualitative descriptive method with the Mental Model Diagnostic Test-Interview About Event (MMDT-IAE) instrument. Based on the research results, there are two types of mental models, namely Partial Understanding (PU) and Partial Understanding with Certain Misconceptions (PU/SM). The effect of surface area on reaction rate, students 1, 2, 3, 4, 6, and 7 answered correctly but could not connect the three levels of representation, while student 5 could not explain the relationship between effective collisions and reaction rate. The influence of structure on reaction rates, students 1, 2, 3, 4, and 7 can answer structure, reactivity and collision theory, while student 5 cannot explain collision theory. Students 1, 4, and 7 can answer all the probing questions but cannot connect the three levels to the influence of ionization energy on the reaction rate. The conclusion of this research is that students' mental models regarding the influence of reactant properties are not complete and there are students who experience misconceptions. The implications of this research are as a basis for teachers to design appropriate learning strategies.
{"title":"Mental model of the influence of reactant properties on reaction rate","authors":"Iqlima Rahayu, W. Wiji, Galuh Yuliani, T. Widhiyanti, Sri Mulyani","doi":"10.24114/jpkim.v15i3.50411","DOIUrl":"https://doi.org/10.24114/jpkim.v15i3.50411","url":null,"abstract":"Reaction rate is still considered difficult by students because it contains abstract concepts and mathematical equations, so students' mental models are not complete. To connect the three levels of representation in the process of addressing chemical problems, learning has to employ mental models as a whole. Therefore, this study aims to obtain students' mental models regarding the influence of reactants properties on reaction rates. This research uses a qualitative descriptive method with the Mental Model Diagnostic Test-Interview About Event (MMDT-IAE) instrument. Based on the research results, there are two types of mental models, namely Partial Understanding (PU) and Partial Understanding with Certain Misconceptions (PU/SM). The effect of surface area on reaction rate, students 1, 2, 3, 4, 6, and 7 answered correctly but could not connect the three levels of representation, while student 5 could not explain the relationship between effective collisions and reaction rate. The influence of structure on reaction rates, students 1, 2, 3, 4, and 7 can answer structure, reactivity and collision theory, while student 5 cannot explain collision theory. Students 1, 4, and 7 can answer all the probing questions but cannot connect the three levels to the influence of ionization energy on the reaction rate. The conclusion of this research is that students' mental models regarding the influence of reactant properties are not complete and there are students who experience misconceptions. The implications of this research are as a basis for teachers to design appropriate learning strategies.","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"333 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139011059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-08DOI: 10.24114/jpkim.v15i3.49349
Timotius Agung Soripada, Erny Tandanu, Refi Ikhtiari
This research is prompted by the emergence of various cases of infectious diseases and antibiotic resistance that often occur and the development of the latest research methods in the field of medicinal plants. One of the medicinal plants that is often used is Curcuma zedoaria which is generally extracted using conventional solvents. This research aims to find new innovations in the extraction process of medicinal plants. This research is a laboratory experiment carried out in vitro. This research uses the latest solvent, called DES (Deep Eutectic Solvent) with the help of ultrasonication to extract active compounds from C. zedoaria as a natural anti-bacterial. DES is known as an environmentally friendly solvent, cheap, easy to make, and is still relatively new in Indonesia. The C. zedoaria extraction process uses two types of DES solvent composition assisted by a ultrasonicator. The research results show that: White turmeric extract (C. zedoaria) obtained by extraction using DES solvent and ultrasonication. Ultrasonication results using 30%, 70% and 100% DES solvent showed antimicrobial properties against Escherichia coli with a lower zone of inhibition compared to the antibiotic ciprofloxacin. Ultrasonication results using 30%, 70% and 100% DES solvent showed antimicrobial properties against Staphylococcus aureus with a lower zone of inhibition compared to ciprofloxacin. TLC data shows that the white turmeric extract obtanined contains various antimicrobial substances which allows to inhibit each other to such an extent that their activity is lower than ciprofloxacin.
这项研究是由经常出现的各种传染病和抗生素耐药性病例以及药用植物领域最新研究方法的发展所推动的。莪术是常用的药用植物之一，一般使用传统溶剂进行提取。本研究旨在寻找药用植物提取过程中的创新方法。这项研究是在体外进行的实验室实验。本研究使用了一种名为 DES（深共晶溶剂）的最新溶剂，在超声波的帮助下，从莪术中提取活性化合物作为天然抗菌剂。众所周知，DES 是一种环保型溶剂，价格便宜，易于制造，在印尼还是一种相对较新的溶剂。C. zedoaria 的提取过程使用了两种 DES 溶剂成分，并由超声波器辅助。研究结果表明使用 DES 溶剂和超声波提取获得的白姜黄提取物（C. zedoaria）。与抗生素环丙沙星相比，使用 30%、70% 和 100% DES 溶剂进行超声处理的结果显示出对大肠杆菌的抗菌特性，但抑菌区较小。使用 30%、70% 和 100%的 DES 溶剂进行超声处理的结果显示，它对金黄色葡萄球菌具有抗菌特性，但与环丙沙星相比，抑菌区更小。TLC 数据显示，白姜黄提取物中含有多种抗菌物质，这些物质可以相互抑制，因此其活性低于环丙沙星。
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Pub Date : 2023-12-08DOI: 10.24114/jpkim.v15i3.50903
N. Nurfajriani, Yohansen Wahyudi
The purpose of this study was to study the effect of adding CaO (calcium oxide) from clam shell ash on physical properties such as density, porosity and water absorption on geopolymer composite bricks. Geopolymer composite bricks are made by mixing sand, geopolymers synthesized from fly ash with NaOH and Na2SiO3 and calcium oxide calcined from feather clam shell which is printed in cylinder form. The bricks are then cured for 28 days and physical tests are carried out in the form of density, water absorption and porosity tests. The results showed that the most optimal addition of CaO is 7.5% for the physical properties of geopolymer composite bricks with a density value of 1.80 gr/cm3, a porosity value of 10.30% and a water absorption capacity of 4.68%. The value has filled the quality standard 1st for bricks set by Indonesian National Standard (SNI).
{"title":"The effect of calcium oxide addition from feather clam shells on porosity and water adsorption geopolymer composite bricks","authors":"N. Nurfajriani, Yohansen Wahyudi","doi":"10.24114/jpkim.v15i3.50903","DOIUrl":"https://doi.org/10.24114/jpkim.v15i3.50903","url":null,"abstract":"The purpose of this study was to study the effect of adding CaO (calcium oxide) from clam shell ash on physical properties such as density, porosity and water absorption on geopolymer composite bricks. Geopolymer composite bricks are made by mixing sand, geopolymers synthesized from fly ash with NaOH and Na2SiO3 and calcium oxide calcined from feather clam shell which is printed in cylinder form. The bricks are then cured for 28 days and physical tests are carried out in the form of density, water absorption and porosity tests. The results showed that the most optimal addition of CaO is 7.5% for the physical properties of geopolymer composite bricks with a density value of 1.80 gr/cm3, a porosity value of 10.30% and a water absorption capacity of 4.68%. The value has filled the quality standard 1st for bricks set by Indonesian National Standard (SNI).","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"62 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139011381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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