cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
jpkim.pps@unimed.ac.id
Editorial Address
Jl. William Iskandar Psr. V Medan Estate, Medan-Indonesia
Location
Kota medan,
Sumatera utara
INDONESIA
Jurnal Pendidikan Kimia (JPKim)
Published by Universitas Negeri Medan
ISSN : 20853653     EISSN : 25493116     DOI : 10.24114
Core Subject : Science, Education, Social,
Biochemistry, Genetics & Molecular Biology Chemistry Education Environmental Science
Jurnal Pendidikan Kimia (JPKim) yang dikelola Program Pascasarjana Universitas Negeri Medan terbit 3 kali setahun, yakni bulan April, Agustus dan Desember. JPKim menerbitkan artikel ilmiah hasil-hasil penelitian pendidikan kimia dan kimia fundamental. JPKim juga menerbitkan artikel Review terkait Pendidikan Kimia dan Kimia.
Arjuna Subject : -
Articles 352 Documents
 25   26   27   28   29 
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 Ing Mayfa Br Situmorang; Feronika Evma Rahayu; Opi Dwi Nurhayati
Jurnal Pendidikan Kimia (JPKIM) Vol 15, No 3 (2023): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v15i3.50078

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).Keywords: Coffea canephora; Disc diffusion; Liquid soap; Staphylococcus aureus
The effect of calcium oxide addition from feather clam shells on porosity and water adsorption geopolymer composite bricks Nurfajriani Nurfajriani; Yohansen Wahyudi
Jurnal Pendidikan Kimia (JPKIM) Vol 15, No 3 (2023): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v15i3.50903

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).Keywords: Calcium oxide; Composite bricks; Fly ash; Geopolymer
Development of ethnoscience-based student worksheets of redox reactions, volta cells, and corrosion using liveworksheets Liana Vinca Rosea Cristy; Fransisca Ditawati Nur Pamenang
Jurnal Pendidikan Kimia (JPKIM) Vol 15, No 3 (2023): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v15i3.51211

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.Keywords: Corrosion; Ethnoscience; Redox reaction; Students’ worksheets; Voltaic cell
Students™ creativity dimension in chemistry e-module based on augmented reality with project based learning approach Nelius Harefa; Sumiyati Sumiyati; Riris Marito Tamba
Jurnal Pendidikan Kimia Vol. 16 No. 1 (2024): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i1.49649

Abstract

The dimension of creativity is an important aspect that must be developed in the learning process. A good dimension of creativity will stimulate students to produce creative, innovative and applicable products. In this study, analysis and interpretation of the dimensions of creativity were carried out which consisted of disciplined, imaginative, inquisitive, persistent, and collaborative. The analysis and interpretation is carried out through a project-based learning approach integrated with augmented reality. The research was conducted at SMA Negeri 2 Jonggol, West Java, in class XI SMA with a total sample of 148 people. The results of interpretation and analysis of research data show that the average score of the dimensions of creativity is 78.6 in the high category, where the highest average score is in the persistent element of 80.04 in the very high category and the lowest average score is in the inquisitive element of 76.68 in the high category. In general, the implementation of a project-based learning approach integrated with augmented reality is able to stimulate an increase in the dimensions of student creativity.
Feasibility study of concentration of chemical and physical parameters in excavated water coal mining as a cage fishing destination Saibun Sitorus; A. Khafifah Dwi Rachmat
Jurnal Pendidikan Kimia (JPKIM) Vol 15, No 3 (2023): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v15i3.50939

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).Keywords: Cages; Chemical; Physical parameters; Pools of former coal mines
Synthesis of silver nanoparticles as a reagent for colorimetric detections of creatinine Yusnaidar Yusnaidar; Martina Asti Rahayu; Yolanda Wulandari
Jurnal Pendidikan Kimia (JPKIM) Vol 15, No 3 (2023): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v15i3.51216

Abstract

In this study, Silver Nanoparticles (AgNPs) was synthesized using natrium citrate as a stabilizing agent and ascorbic acid as a reducing agent. The aim of this study is to investigate the optimum condition of creatinine colorimetric detection using silver nanoparticle synthesized. The reaction was carried out at temperature within an alkaline environment with a pH of 10,5. The concentration of reducing and capping agent showed a significant effect to absorption spectra via UV-Vis spectrophotometer. The produced citrate-capped AgNPs exhibited SPR absorbance within the range of 390–410 nm. The detection mechanism relies on the aggregtion of nanoparticles with analytes, resulting in a shift in Localized Surface Plasmon Resonance (LSPR) towards a longer wavelength. The experiment showed that the pH condition of the medium played an essential part in the interaction between creatinine and silver nanoparticles (AgNPs). Development of creatinine detection methods is based on the ability of tautomerization of creatinine to its anionic amino species at alkaline pH led to cross-linking with the negatively charged AgNPs through hydrogen bond networks, facilitating the aggregation mechanism. This aggregation resulted in particle resulted a color shift from yellow (with a maximum wavelength of 403nm) to dark blue (with a maximum wavelength of 670 nm) within 5 minute of reaction at pH 12. With this strategy, a linear relationship between the A670/A403 extinction ratio and creatinine concentrations was obtained in the range of 10–50μM with a coefficient of determination of 0.935.Keywords: Aggregation; Citrate; Creatinine; Silver nanoparticle; Surface plasmon
The evaluation of biochemistry practicum based on several parameters of laboratory services in chemistry department Universitas Negeri Surabaya during the even semester Mirwa Adiprahara Anggarani; Dzikra Nasyaya Mahfudhah; Soesilowati Soesilowati; Avissa Auryn Wijayanti; Syananda Zahra Fadila; Nuniek Herdyastuti; Muhammad Nurrohman Sidiq
Jurnal Pendidikan Kimia (JPKIM) Vol 15, No 3 (2023): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v15i3.47646

Abstract

This study was conducted to evaluate laboratory management during biochemistry practicum activities and to build laboratory information for the internal and external community of Universitas Negeri Surabaya (Unesa) in 2023 through several aspects, namely infrastructure, tools, materials, and PLP/laboratory services. A descriptive-qualitative approach is used with a questionnaire for all biochemistry practitioners. The result shows that all aspects of biochemistry practicum activities obtain percentages sequentially of 89%, 90%, 93%, and 90%, which are included in the excellent category, so it can be concluded that all practitioners are highly satisfied with laboratory services during practicum. However, improvements to the deficiencies still need to be made so that the following practicum activities run better and optimally.Keywords: Biochemistry practicum; Evaluation; Laboratory management; Laboratory services
Synthesis of silver nanoparticles from coffee parasite leaf extract (Scurrulla ferruginea (Roxb. ex Jack) Danser) and potential activity as an antioxidant and anticancer Destria Roza; Tico Guinessha Samosir; Sri Adelila Sari; Rini Selly
Jurnal Pendidikan Kimia Vol. 16 No. 1 (2024): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i1.54145

Abstract

This study aim is to know the results of the synthesis of silver nanoparticles from quercetin and Scurrula ferruginea (Roxb. Ex Jack) danser as well as its potential as an antioxidant and anticancer. The solvent used in the maceration extraction method in this research is the polar solvent methanol. Isolation and purification of thick extract compounds from coffee parasite leaves were carried out using liquid vacuum chromatography (CVC) and gravity column chromatography (GCC) methods. Silver (Ag) nanoparticle is made with the stirrer method at a speed of 1500 rpm for 60 minutes at a temperature of 70o C. Silver nanoparticle solution was produced and then characterized using FTIR (Fourier Transform Infra Red) and PSA (Particles Size Analyzer). PSA results analysis using extract coffee parasite size 214 nm particles, whereas using flavonoid isolate quercetin confirmed size 29 nm. FTIR showed that there was a stretching vibration of the OH group at a wave number of 3229.25 cm-1, the C=O function at the wave number 1637.87 cm-1, and the CO functional group at the wave number 1016.31 cm-1. Antioxidant test using the DPPH method was carried out in silver nanoparticle solution using extract Scurrula ferruginea (Roxb. Ex Jack) danser and with quercetin obtained an IC50 value of around 115.4 and 114.9 this result describes as moderate level of antioxidants. Even though the nanoparticle anticancer test was very weak, overall, the synthesis of silver nanoparticles using flavonoid isolates was better than using extracts from coffee parasite leaves.
Optimization of the upgrading process of bio-oil from palm fronds: The effect of temperature, catalyst mass ratio, and reaction time Junifa Layla Sihombing; Ahmad Nasir Pulungan; Janter Pangaduan Simanjuntak; Muhammad Irvan Hasibuan; Lisna Efiyanti; Rahayu Rahayu; Ajeng Asri Audi; Muhammad Hadi
Jurnal Pendidikan Kimia Vol. 16 No. 1 (2024): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i1.52556

Abstract

The lignocellulosic component contained in palm frond waste has potential as an alternative fuel by converting it into bio-oil through a pyrolysis process. However, bio-oil has poor quality when compared to conventional fuels. Therefore, the Hydrodeoxygenation (HDO) process has been widely developed as a promising way to improve the poor physicochemical properties of bio-oil. In this study, a bimetallic CuO-ZnO catalyst loaded on mordenite zeolite was used as a catalyst for HDO bio-oil from palm fronds. Optimization efforts were made on several parameters that affect the reaction including temperature, catalyst mass, and reaction time. This study aims to improve the quality of bio-oil and determine the effect of variations in reaction parameters on the physicochemical properties of upgraded bio-oil. The optimum condition found was the HDO process with a catalyst mass of 3.5 wt% at 325 °C for 120 min. The physicochemical properties of bio-oil after the upgrading process were successfully improved from those of raw bio-oil. The result is a decrease in water content and total acid number, an increase in C and H content accompanied by a reduction in oxygen content with a degree of deoxygenation reaching 72.9%, and an increase in higher heating value (HHV).
Development of web-based media in instrument analysis college to improve student competence Gulmah Sugiharti; Haqqi Annazili Nasution; Mutiara Agustina Nasution; Muhammad Isa Siregar
Jurnal Pendidikan Kimia Vol. 16 No. 1 (2024): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i1.50775

Abstract

This research aims to develop and obtain Web-based learning media that meets the eligibility requirements according to BSNP criteria, determine the increase in student competency by using the developed Web-based media and determine the percentage of student responses to Web-based media used in lectures on the topic of instrument analysis. This research method is a research and development method using the ADDIE model. Web-based media was validated by media experts and material experts, then the valid media was presented to 26 Chemistry Education students at Medan State University to see the influence of the Webb media developed and get responses on the web-based media used. The research results show that the Web-based learning media developed meets the BSNP eligibility criteria with an average percentage of 91.25%. The use of Web-based media can increase student competency in lectures on the topic of Instrument Analysis, namely 75% for experimental classes that use Web media and 56% for classes without Web media. Learning outcomes using Webb media are better than without using Webb media and student responses to the use of Webb-based media in lectures Topic evaluation Instrument analysis is very high. Thus, over all the Web-based media developed is good for use in lectures on the topic of Instrument Analysis, to provide students with learning experiences in using the Web.

Page 27 of 36 | Total Record : 352

 25   26   27   28   29 

Filter by Year

2014 2024


Reset
Filter By Issues
All Issue Vol. 16 No. 3 (2024): J. Pendidik. Kim : December 2024 Vol. 16 No. 2 (2024): August Vol. 16 No. 1 (2024): April Vol 15, No 3 (2023): December Vol 15, No 2 (2023): August Vol 15, No 1 (2023): April Vol 14, No 3 (2022): December Vol 14, No 2 (2022): August Vol 14, No 1 (2022): April Vol 13, No 3 (2021): December Vol 13, No 2 (2021): August Vol 13, No 1 (2021): April Vol 12, No 3 (2020): December Vol 12, No 2 (2020): August Vol 12, No 1 (2020): April Vol 11, No 3 (2019): December Vol 11, No 2 (2019): August Vol 11, No 1 (2019): April Vol 10, No 3 (2018): December Vol 10, No 2 (2018): August Vol 10, No 1 (2018): April Vol 9, No 3 (2017): Desember Vol 9, No 2 (2017): Agustus Vol 9, No 1 (2017): April Vol 8, No 3 (2016): Desember Vol 8, No 2 (2016): Agustus Vol 8, No 1 (2016): April Vol 7, No 3 (2015): Desember Vol 7, No 2 (2015): Agustus Vol 7, No 1 (2015): April Vol 6, No 3 (2014): Desember Vol 6, No 2 (2014): Agustus Vol 6, No 1 (2014): April More Issue