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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
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Development of an augmented reality-based chemical bonding module assisted by the assemblr EDU Fransisca Ditawati Nur Pamenang; Agnesia Nina Utami
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.v16i2.57375

Abstract

Conventional media, like textbooks, lack interaction explaining chemical bonding, hindering dynamic learning. They're static and unable to visualize bonding effectively. Moreover, unengaging teaching methods cause student disinterest, hindering learning, particularly in complex subjects like chemical bonding. To address this issue, developing augmented reality-based chemical bonding modules is a potential solution to help students learn about chemical bonding. This study aims to accomplish the following objectives: (1) Develop a chemical bonding module based on augmented reality using the Assemblr EDU, following the ADDIE development model. (2) Determine the feasibility of the augmented reality-based chemical bonding module. The research methodology employed in this study is Research and Development (R&D), utilizing the ADDIE development model. The study's findings reveal the following: (1) The module was developed using the ADDIE development model with the Assemblr EDU. (2) The augmented reality-based chemical bonding module is highly valid, achieving a material validity score of 89.33% and a media validity score of 93.5%. It is also convenient, earning an average practicality rating of 88.14% with an "excellent" response from users. Additionally, the module is effective, as evidenced by a student evaluation score averaging 70, which falls within the high criteria range. The augmented reality-based module is a valuable tool for enhancing the understanding of chemical bonding during learning.
Enhancing creativity skills and student learning outcomes through the implementation of creative problem solving model with mind mapping on salt hydrolysis topic Bella Windira Sari; Sri Retno Dwi Ariani; Ari Syahidul Shidiq; Bakti Mulyani; Sri Yamtinah; Mohammad Masykuri; Maria Ulfa; Agung Nugroho Catur Saputro
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.v16i2.58765

Abstract

In the face of increasing demands for 21st-century skills, chemistry education must advance to better support students in developing problem-solving abilities. Effective chemistry learning models are crucial in addressing this need. This study examines the impact of the Creative Problem Solving (CPS) model, equipped with the Mind Mapping method, on students' creative thinking skills and cognitive learning outcomes in salt hydrolysis. A quasi-experimental method with a pretest-posttest control group design was used in this research. Cluster random sampling was employed for sample selection. The sample consisted of 72 students from a school in Surakarta City. Data were collected using a test instrument with eight essay questions to assess creative thinking skills and six essay questions to evaluate cognitive learning outcomes. Non-parametric statistical tests were utilized for data analysis. The results of the Kruskal-Wallis™s test produce sig. (0.000 < 0.05) which means the hypothesis is accepted. The results showed that applying the CPS learning model with mind mapping affected students' creative thinking skills and cognitive learning outcomes so that it can be used as an alternative learning model to improve 21st-century skills. This research contributes new insights into applying the Mind Mapping-assisted CPS learning model for chemistry education.
Synthesis and characteristics rubber seed oil bioadditive from Sumatera Utara as low pour point of CPO biodiesel Misdawati Misdawati; Siswadi Siswadi; Muhammad Said Siregar
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.v16i2.62374

Abstract

One of the drawbacks of Crude Palm Oil (CPO) biodiesel is that it has high pour point which causes disadvantages in it™s use. North Sumatra is the second largest rubber producer in Indonesia, the use of rubber seeds as a bioadditive to reduce the pour point of CPO biodiesel is one of the right steps. The synthesis of rubber seed oil bioadditives is carried out in two processes; esterification process and transesterification process. This research aims to reduce the pour point of CPO biodiesel by mixing it with bioadditive of rubber seed oil. This study evaluated the effect of composition to find the best combination of biodiesel ratios in the mixture. The research results show that the greater the proportion of bioadditive rubber seed oil, the lower the pour point of the mixed biodiesel. Biodiesel with a low pour point is obtained at 10oC from mixing CPO biodiesel with bioadditive rubber seed oil at a composition of 75:25 and the optimal pour point is -7oC. Performance testing is carried out to differentiate fuel properties and fuel performance. The results show that B15 fuel produces the best performance at a maximum engine speed of 3000 rpm. In this round, a maximum power of 1.5708 kW was obtained, the lowest specific fuel consumption was 517.52 gr/kWh, thermal efficiency was 18.77%; the smallest CO content was 2.808%; HC 185 rpm; CO2 5.28%; NOx 4 ppm.
The effect of comonomer styrene on the grafting of maleic anhydride onto cyclized natural rubber Muhammad Said Siregar; Desi Ardilla; Eddiyanto Eddiyanto; Asmarasari Nasution
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.
The effect of pH and type of silicone on cotton and polyester finished fabrics Wulan Safrihatini Atikah; Witri Aini Salis; Lingga Permana; Brilyan Muhammad Redya
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.v16i2.57150

Abstract

A Characteristic often found in textile products is softness. The compound widely used as softener is silicone compound. The aim of this research is to determine the properties that will be obtained from the type of fabric being processed by comparing the use of silicon types, namely amino-propyl-functional polydimethyl siloxane (PDMS) and blocked amino silicone to each fabric. Firstly, research was conducted by varying the pH of the finishing process. Determined optimum pH will be followed by determining concentration of 15“60 g/L for each type silicone. The experiments was carried out on pad- dry- cure method. The tests carried out include fabric stiffness, tensile strength, resistance to repeated washing and heat, yellowing effect, Fabric Touch Tester and Water Contact Angle testing. It was found that there was no significant influence of pH on the use of amino-propyl-functional polydimethyl siloxane and blocked amino silicone compounds, so the next process was carried out at pH 7. Increasing the concentration of the softener will provide a better softening effect and optimum concentration at 45 g/L for both types of fabric used. Blocked amino silicone has better resistance to repeated washing compared to amino-propyl-functional polydimethyl siloxane. Heat testing shows that differences in molecular structure have no influence on both fabrics. Fabric processed using amino-propyl-functional polydimethyl siloxane provides a yellowing effect. Amino-propyl-functional polydimethyl siloxane provides good hydrophilicity. The softness value of blocked amino silicone is better performance on cotton fabric.
Mechanical properties of water hyacinth (Eichhornia crassipes) and sansevieria (Sansevieria trifasciata) fiber reinforced composite with polyester matric Nurfajriani Nurfajriani; Ahmad Nasir Pulungan; Ajat Sudrajat; MS Manurung; 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.
The quality of indonesian brands of consumable cooking oils is reviewed by peroxide numbers and free fatty acid value Mirwa Adiprahara Anggarani; Prima Retno Wikandari; Rudiana Agustini; Rusyariyanto Waskito; Yuni Fransiska
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.v16i2.59012

Abstract

This study evaluated laboratory skills among the students during biochemistry practicum activities and built laboratory information for the internal and external community of Universitas Negeri Surabaya in 2024. The habit of reusing cooking oil for the main reason of saving costs can cause health problems. Parameters used to determine quality cooking oils include content-free fatty acids and number peroxide. The research purposes for this experiment are to know the rate of free fatty acids and the number of peroxides in Branded and out-of-stock cooking oil used for now. Determination of free fatty acids was done with the method of alkalimetry and the determination number of peroxide was done with the technique of iodometry. Result of the study This shows average rate of sour fat-free oil frying before frying is 0.22% And after frying becomes 0.40% or enhancement amounting to 185.98 %. The average level of number peroxide oil fried before frying is as big as 1.11 meq O2 /kg and after frying to 3.52 meq O2 /kg or enhancement as big as 317.25%. Average rate sour fat-free oil fry before frying No exceed standard SNI 7702: 2012, namely maximum 0.3%. However, the average level of free fatty acids in cooking oil after frying exceeds the SNI 7702:2012 standard, namely above 0.3%. Whereas the average rate number peroxide oil fry before and after frying does not exceed standard SNI 7709: 2012 which is a maximum of 10 meq O2 /kg.
Improving students' scientific literacy : Development of guided inquiry-based student worksheets on buffer solution material Arif Sholahuddin; Normina Normina; Rilia Iriani
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.
Developing a weblog-based additive and addictive substance teaching module to improve critical thinking skills Ade Nur Anugrah; Muzzazinah Muzzazinah; Mohammad Masykuri
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.v16i2.58490

Abstract

This study aims to develop and obtain a webb-based teaching module on the material of additives and addictive substances. Also to determine the feasibility of the module, improvement think critical students, knowing which is better, learning using developed modules or existing books and to find out students' responses after being taught with the module substance additives and addictive based webb developed. The research method with R&D using the ADDIE model. The Webb-based teaching module was validated by 7 validators, then the valid module was presented to 20 students as a limited trial. The subjects of this study were 2 classes of class VIII students of Junior High School 8 Binjai, each class consisting of 28 students. The test instrument consisted of 15 critical thinking questions and non-test instruments in the form of BSNP questionnaires and student response questionnaires. The results of the study showed that the webb-based learning module on the material of Additive and Addictive Substances developed was categorized as Valid at a validity of 3.4 or an average percentage of 85%. While the results of the n-gain test were 82% in the experimental class with a high category and 73% in the control class with high category. t- test results shows that critical thinking skills student which using module teach based on webb which has developed more higher than the critical thinking skills of students who are taught using books package which exists at school. Results of student response questionnaire analysis show that student give response positive as big as 86%. Thus, the webb-based teaching module developed is ready to be used in learning the material on additives and addictive substances in food in order to improve students' critical thinking skills.
Detecting the interest of undergraduate students : A new way of chemistry education as a basis for instructional development Parham Saadi; Almubarak Almubarak; Restu Prayogi; Fadhlan Muchlas Abrori
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.v16i2.61402

Abstract

The achievement of learning targets is largely determined by how learning facilitates the needs of participants. Interest is one of the important points that teachers need to be aware of, especially in higher education environments to produce competent and resilient students (prospective teachers). The purpose of the research was to detect the interests of chemistry education students quantitatively and other themes that related to their lives. The quantitative approach was the method used in the study because it was in line with the data collection technique, namely the questionnaire technique with quantitative analysis. The results showed that the theme interest œeveryday life with the topic of food has the largest percentage, namely 86%, while the least theme was textile dyeing (58.30%) by chemical processes theme. Other additional themes revealed that social media (digital technologies) has 75.50% while teaching & learning and diversity have percentages of 64.70% and 59%, respectively. The conclusion was that detecting elements of interest in students could be supporting data for designing chemistry learning considering the changes in the mindset of the young generation due to digital culture. This research can also be used as a needs analysis in learning because a great interest in learning affects students™ academic performance. Research findings also give be a provision for students when they become teachers so that this research can be used in the school environment.

Page 29 of 36 | Total Record : 352

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