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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
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Synthesis of silver nanoparticles from coffee parasite leaf extract (Scurrulla ferruginea (Roxb. ex Jack) Danser) and potential activity as an antioxidant and anticancer Roza, Destria; Samosir, Tico Guinessha; Sari, Sri Adelila; Selly, Rini
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.
A systematic review: How to implementation of problem solving model in chemistry learning? Sakinah, Ayar; Handayani, Sri
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.v16i1.54996

Abstract

Chemistry is one of the difficult subjects at all levels of education, this is what makes it difficult for students to solve problems so that student learning outcomes decrease. The things that cause chemistry learning problems are influenced by monotonous learning process activities, the application of less innovative learning models and methods that have a negative impact on students' ability to understand chemical concepts. This research aims to find out the implementation of problem solving in chemistry learning. This research method uses a systematic literature review (SLR) by analyzing previous research using the Google Scholar and Scopus databases in the last 10 years, namely 2014-2022. The 14 articles reviewed were obtained after going through the scanning process according to the inclusion criteria. The results of this study indicate that in chemistry learning it is necessary to improve problem solving in chemistry learning.
Physicochemical and antibacterial pathogenic characterization of papaya leaf extract liquid soap (Carica papaya L.) Handayani, Dewi; Hepriyeni, Yesi; Amir, Hermansyah; Ginting, Sura Menda; Nurhamidah, Nurhamidah
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.v16i1.55515

Abstract

This research aims to identify the physicochemical characteristics and pathogenic antibacterial activity of papaya leaf extract liquid soap (Carica Papaya L.). The sample used was papaya leaf extract whose mass was varied. The data acquisition process was obtained from the results of physicochemical testing of liquid soap formulations and from the results of antibacterial activity tests. This research began by extracting the sample using maceration technique. The extract was then formulated to be the liquid soap formulation 1, 2 and 3 with various masses i.e. three, four and five grams of extract, respectively. The physicochemical test showed that the organoleptic test, pH test, foam height test, specific gravity test, water content test and free alkali test met the SNI physical quality standards for liquid soap and the antibacterial activity test carried out on S. aureus and E. coli bacteria was obtained for S. aureus bacteria. formulations 1, 2 and 3 produce resistance of 2.06 mm, 2.21 mm and 2.46 mm respectively. Meanwhile, for E. coli bacteria, the inhibitory power produced by formulations 1, 2 and 3 was 2.84 mm, 3.41 mm and 3.71 mm, respectively. Based on the results of this research, it can be concluded that the liquid soap formulation from papaya leaf extract meets the physical standards for liquid soap quality according to SNI and has antibacterial activity.
Development of test instruments to measure problem-solving and science literacy of grade XI students on ion equilibrium material in salt hydrolysis Novita, Santi; Susilawati, Susilawati; Rery, Radjawaly Usman
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.v16i1.55568

Abstract

Low science literacy in students will have an impact on students' ability to solve problems. To improve it, it is necessary to develop an assessment instrument in the form of a science literacy instrument. This study aims to develop valid, reliable problem solving and science literacy assessment instruments for students. The material chosen is ion equilibrium in salt solution. The research was conducted in high, medium and low ability schools namely SMA Negeri 1 Pekanbaru, SMA Negeri 12 Pekanbaru and SMA Negeri 15 Pekanbaru. There are 16 questions out of 20 questions that are constructively valid with a correlation value> 0.36. The questions developed have met the reliability requirements with a Cronbach alpha coefficient value greater than 0.6, reaching a value of 0.874. The level of difficulty of questions between 0.3 -0.7 is in the good enough category and differentiating power ≥ 0.3. Based on two trials, namely one-on-one trials and limited trials, the same results were obtained that the assessment instruments developed for students had very good readability aspects (85%), good adequacy aspects (64%) and assessment instruments developed for teachers had very good feasibility aspects (91%). There is a significant difference in the ability of students in high schools with medium and low ability schools.
The quality of tinuktuk in the frozen temperature storage Damanik, Marini; Riris, Ida Duma; Susanti, Nora; Ramadhaniyah, Nurul; Rinanda, Jihan Afstria
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.v16i1.55861

Abstract

Tinuktuk is considered nutritious and able to boost immunity. A local product based on natural resources and spices in Indonesia. The different concentrations of the main ingredients used in the production of tinuktuk produce good quality and nutrition for safe, healthy, and nutritious consumption. So far, there is no optimum composition of tinuktuk and also quality analysis during the storage period in the frozen temperature of tinuktuk, so this research is necessary. In this research, the roasting method is used for the drying process of making tinuktuk. The roasting process is one of the isothermal drying processes. The purpose of this study was to determine the quality characteristics of tinuktuk during storage at -10°C for 56 days which is analyzed every 7 days. Tinuktuk characteristic parameters include pH, moisture content, ash content, and microbial analysis. The results of the research that have been carried out are 30%: 70% and 40%: 60%, which have similarities with the results of the analysis of tinuktuk that has been marketed, namely the 30%: 70% ratio, wherein the 30%: 70% ratio the pH analysis decreases steadily from 6.3 to 5.9. Ash content analysis resulted in a stable decrease from 7% to 5%. Microbial analysis with ALT testing resulted in stable data during storage at 2.5 x 102 colonies/g. Antioxidant analysis of 30%:70% ratio resulted in antioxidant IC50 data of 93, 4 ppm to 183.6 ppm.
The need analysis for computational chemistry based learning media atomic structure and chemical bonding basic chemistry courses Nugraha, Asep Wahyu; Sinaga, Marudut; Darmana, Ayi; Sutiani, Ani; Aini, Nisa Qurrata
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.v16i1.56258

Abstract

The aim of this research is to analyze students' needs for computational chemistry-based learning media on atomic structure and chemical bonding in the Basic Chemistry course. The population of this study were the first grade students of the Chemistry Department, FMIPA Unimed. The number of samples in this study was 93 students from three classes. The instruments used are multiple choice questions and questionnaires to determine mastery of atomic structure and chemical bonding. The research results show that the average score is 34.430 (poor category). The average score achieved in atomic structure material was 33.16 (very poor). The lowest score achieved in the atomic properties sub-material was 9.3. The average score achieved in chemical bonding material was 36.1 (very poor). The lowest score achieved in the properties of ionic compound sub-material was 17.5. The results of the questionnaire showed that the atomic structure material that students considered the most difficult was the wave mechanics atomic model at 72.233 (quite difficult), while for chemical bonding material it was the octet and duplet rule at 71.055 (quite difficult).
Mechanical properties of water hyacinth (Eichhornia crassipes) and sansevieria (Sansevieria trifasciata) fiber reinforced composite with polyester matric Nurfajriani, Nurfajriani; Pulungan, Ahmad Nasir; Sudrajat, Ajat; Manurung, MS; Rahayu, Rahayu
Jurnal Pendidikan Kimia Vol. 16 No. 2 (2024): August
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i2.56532

Abstract

Sansevieria (Sansevieria trifasciata) fibers and water hyacinth (Eichhornia Crassipes) fibers as natural fiber producers with good quality have good potential to be developed. This study aims to examine the production and characteristics of composites made from sansevieria fiber and water hyacinth fiber with a polyester matrix through the employment of the hand lay up method. This composite uses variations in the composition of the fiber mixture by soaking 5% NaOH for 2 hours at room temperature, for the resulting composite material. The resulting composite material is then subjected to a bending test to determine its mechanical properties, utilizing the ASTM D638 test standard. Based on the conducted research, the most favorable outcomes in terms of bending test results and modulus of elasticity are observed with a 10% incorporation of sansevieria fiber, yielding an average of 5.520 MPa for bending test and an elastic modulus of 7.444 MPa. Alternatively, when combining both fibers, the optimal mixture consists of 20% sansevieria fiber and 20% eceng gondok fiber, resulting in an average bending test value of 7.503 MPa and a modulus of elasticity of 7.873 MPa.
Development of chemino card learning media (chemical domino cards) on elemental stability material Suhardi, Suhardi; Side, Sumiati; Allo, Eda Lolo
Jurnal Pendidikan Kimia Vol. 16 No. 2 (2024): August
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i2.56574

Abstract

This reserach is research and development which aims to determine the level of validity, practicality and effectiviness of Chemino Card learning media as a learning media on elemental stability material which was carried out at X IPA. This development refers to the ADDIE development model which consists of five stages, namely: (1) analysis stage, (2) design state, (3) development stage, (4) implementation stage and (5) evaluation stage. The validity instrument is in the form of a validation sheet for media experts and material experts. Practical instrument include learning implementation observation sheets, teacher response questionnaires, student response questionnaires. The effectiviness instrument is a learning outcomes test. Research results show that: (1) the validity of the Chemino Card media based on material experts and media experts, respectively 3.33 and 3.46 which are included in the very valid category, (2) the practicatily of the Chemino Card media based on the observation of learning implementation, response questinnaire teachers and student respectively 96.67%, 90.03% and 83.42% which are included in the very high category, (3) effectiveness of Chemino Card media based on student learning outcomes that achieve class mastery of 92% that it is included in the effective category. Based in these data, it was concluded that Chemino Card learning media on elemental stanility material developed using the ADDIE model were stated to be valid, practical and effective for us in learning.
Improving students' scientific literacy : Development of guided inquiry-based student worksheets on buffer solution material Sholahuddin, Arif; Normina, Normina; Iriani, Rilia
Jurnal Pendidikan Kimia Vol. 16 No. 2 (2024): August
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i2.56718

Abstract

Everyone must have scientific literacy to actively participate in advancing science, technology, and society. However, the scientific literacy skills of Indonesian students are still low. This research aims to develop student worksheets based on guided inquiry on buffer solution material to increase students' scientific literacy. This research applied 4D development research which includes the Definition, Design, Development, and Dissemination stages. At the definition stage, a needs analysis was carried out, while at the design stage, a draft of the student worksheet was made. At the development stage, the worksheet was validated by 5 validators. Furthermore, the revised worksheet was tested for readability by 10 students in class XI IPA. Finally, the revised worksheet was field tested on 32 students through a learning buffer solution in class with a guided inquiry strategy. This study employed a descriptive approach to assess the validity, practicality, and effectiveness of the worksheet. The findings indicate that the developed worksheet is highly valid, with an average validity score of 94.11% across the content, presentation, media, and language aspects, placing it in the very valid category. The worksheet also achieved a practicality score of 84%, indicating it is practical. Additionally, the worksheet improved students' scientific literacy with an N-gain value of 0.59. Therefore, it can be concluded that the worksheet can be used to improve students' scientific literacy through buffer solution learning.
The effect of comonomer styrene on the grafting of maleic anhydride onto cyclized natural rubber Siregar, Muhammad Said; Ardilla, Desi; Eddiyanto, Eddiyanto; Nasution, Asmarasari
Jurnal Pendidikan Kimia Vol. 16 No. 2 (2024): August
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i2.56906

Abstract

The grafting degree of maleic anhydride onto cyclized natural rubber is generally still low. This is due to the lack of electron density of the maleic anhydride double bond so that its reactivity is low. This research aims to increase the grafting degree by the addition of a styrene comonomer. Grafting of maleic anhydride onto cyclized natural rubber had been performed in an internal mixer 150 oC and 80 rpm in the presence of styrene comonomer. The grafted product was analyzed by Fourier Transform Infra-Red to determine the presence of maleic groups and Differential Scanning Calorimetry and Thermalgravimetric to investigate its thermal properties. Fourier Transform Infra-Red spectra confirmed that the grafted product of maleic anhydride onto Cyclized Natural Rubber formed with absorption at 1700 cm-1, 1850 cm-1 and 700 cm-1. The higher concentration of maleic anhydride reacted the higher of grafting degree of maleic anhydride with the high intensity of absorption at 1700 cm-1 and 1850 cm-1. Differential Scanning Calorimetry spectra showed that the glass transition temperature of maleated Cyclized Natural Rubber products increases, the more comonomer are added the higher the glass transition temperature of the product. Generally, based on the Thermalgravimetric spectra, the thermal properties of grafted product does not change significantly compared to the blank sample.

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