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Jurnal Pendidikan Kimia (JPKim)

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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.

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Articles 352 Documents

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Inovasi Lembar Kerja Siswa Reaksi Redoks Berbasis Pemecahan Masalah Untuk Siswa SMA Ramlan Silaban; Marianna Pasaribu; Sary MF Sitompul; Trisna W Simanullang
Jurnal Pendidikan Kimia (JPKim) Vol 8, No 1 (2016): April
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. This study aimed to obtain an innovative student worksheet (LKS) on Redox reaction and its influence on learning outcomes, affective and psychomotor attitudes of high school students. To achieve the objectives, conducted quasi-experimental research which starts from the assessment of some chemical LKS redox which used in high school students of MIA of X class, compile worksheets based innovative PBL, standardize, and limited test. There are two types of instruments in this research instrument a questionnaire BSNP non test and test instrument in the form of a multiple choice test is valid. The results obtained from this study: (1). Student worksheet (LKS) redox developed already meet the standards set by the National Education Standards Beureau. (2) The results of the student learning outcomes of senior high school students that learned using innovative worksheets on the redox reaction is higher than using an existing worksheet. (3). Affective percentage of students that learned using innovative worksheets on the redox reaction is higher than using existing worksheets. (4). Psychomotor percentage of students that learned using innovative worksheets on the material and the redox reaction is higher than using existing worksheets. Kata kunci: LKS inovatif, problem based learning, reaksi oksidasi dan reduksi

The effect of e-learning media application using problem based learning models to activities and results of student learning in salt hydrolysis subject Nisa Humairah; Marini Damanik; Eddyanto Eddyanto
Jurnal Pendidikan Kimia (JPKim) Vol 10, No 3 (2018): December
Publisher : Pascasarjana Universitas Negeri Medan

This study purpose to determine the improvement of chemical learning outcomes and student learning activities that used e-learning media with problem based learning models on the subject of salt hydrolysis. The design was used One Group Pretest and Postest. The instrument used two domains, namely cognitive and affective. Hypothesis testing is carried out using the two-part of t-test. The hypothesis’s test of student learning outcomes obtained tcount = 29.5 while ttable = 2.03 for α = 0.05 and db = 34. Thus tcount> ttable then the hypothesis of Ha is accepted. It concluded that there is an improvement in students' chemistry learning outcomes on salt hydrolysis subject that used e-learning media with problem based learning models. Not only the percentage increased in learning outcomes of 68.4%, but also the percentage of student learning activities of 84% which means very active.Keywords:e-learning; learning activities; learning outcomes; problem based learning

Computational calculation of acetalization of 2-chlorobenzaldehyde reaction mechanism using hydrochloric acid catalyst with ab initio method Muhammad Yusuf
Jurnal Pendidikan Kimia (JPKim) Vol 12, No 1 (2020): April
Publisher : Pascasarjana Universitas Negeri Medan

The aim of this research was to investigate the possible reaction mechanism steps in the formation of acetal from 2-chlorobenzaldehyde substrate. Asetal is a chemical compound that attracts the attention of the researchers because it has advantage in various fields of life. This study was conducted using Hyperchem software (OS Window’s) with the ab initio method using a 6-31G* basis set. In this study, the 3-21G basis set was also used as a comparison. The calculations were performed for each steps of the reaction mechanism including the substrate, the formation of hemiacetal intermediate, and the formation of acetal products. Based on the results of computational calculations, the acetalization of 2-chlorobenzaldehyde reaction can occur in the presence of an HCl catalyst. The HCl catalyst serves as an acid catalyst where hydrogen ions will be protonated by the substrate and hemiacetal. Hemiacetal compounds based on calculations have the highest formation energy compared to the benzaldehyde substrate and acetal products. This is because hemiacetal has a low stability and is easily transformed into other compounds. Keywords: Ab initio; 2-chlorobenzaldehyde; acetal

ANALISIS DAN PENGEMBANGAN BUKU AJAR KIMIA KELAS X SEMESTER I SMK FARMASI SESUAI KTS Boni Mariska Ratnawati; Ramlan Silaban; Eddiyanto Eddiyanto
Jurnal Pendidikan Kimia (JPKim) Vol 6, No 1 (2014): April
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. This research aims to (1) Analyze the chemistry handbooks used in the vocational school of Pharmacy in North Sumatra, (2) Develop a sequence of chemical material suitable to grade X semester I and systematically according to KTSP of Pharmacy Vocational School, (3) Knowing what chemical materials worth and the right to be taught in Pharmacy vocational school grade X semester I so that learning is more systematic and easily understood by BSNP students in learning, (4) Developing the chemistry handbook for grade X semester I Pharmacy Vocational School appropriate with KTSP, and (5) Knowing the opinion of teachers of chemistry at Pharmacy Vocational School on the development of standard chemistry handbook of grade X semester I. Sample in this study are two publishers of chemistry handbooks used in grade X semester I of the most widely used in Pharmacy Vocational School in North Sumatera, has graduated from the book center, and marketed nationally and four vocational school chemistry teacher used grade X Pharmaceuticals as a respondent and has teaching experience in grade X Pharmacy Vocational School for a minimum of two years and a minimum education is bachelor degree (S1). This is a research development using qualitative data described by using the time sentence by emphasizing the documentary technique. This research instrument is a questionnaire with a book containing sheets of the feasibility of the indicators derived from the assessment of National Education Standards Agency (BSNP) in 2006, later identified occurrence for each book. Furthermore it is developing chemistry handbook for grade X semester I Pharmaceuticals appropriate vocational curriculum, which will be assessed by the respondent chemistry teachers of Pharmacy Vocational School. The assessment results of validation between the average range to determine whether or not worthy of the book used in grade X semester I of Pharmacy Vocational School. The results of the feasibility analysis of the contents of the handbooks most widely used chemical in the first semester of the grade X is obtained percentage Pharmacy Vocational School: books A, and B are, respectively 51.89% and 76.01%. Validation range obtained in the proposed grade X semester I of chemical materials Pharmacy Vocational School is 3.6 means that the proposal put forward appropriate materials are used in the development of chemistry handbooks for grade X semester I Pharmacy Vocational School. Assessment chemistry handbook for grade X semester I Pharmacy Vocational School on the feasibility of content, language, and presentation by chemistry teacher of Pharmacy Vocational School respondents obtained an average yield of the range of validation in order are 3,31; 3,52, and 3,51. Validation of the overall range obtained from the four respondents chemistry teacher of Pharmacy Vocational School is 3.45, this means that the Chemistry Handbook for Grade X Semester I Pharmacy Vocational School According With KTSP is valid and does not need to be revised again and have been feasible to use in chemistry learning in Pharmacy Vocational School.Keywords: Chemistry Handbook, Pharmacy Vocational School, Analysis, Development, KTSP

Development of PBL-STEM-based E-LKPD to improve students' science literacy skills on reaction rate materials Rina Safitri; Haryanto Haryanto; Harizon Harizon
Jurnal Pendidikan Kimia (JPKim) Vol 13, No 2 (2021): August
Publisher : Pascasarjana Universitas Negeri Medan

The development model used is Research & Development which adopts the Lee & Owens development model. The product to be developed is E-LKPD using 3D Pageflip Professional software. 1. The procedure for developing E-LKPD with the PBL-STEM approach in improving scientific literacy skills on the reaction rate material for students. The research procedure consists of five stages, namely analysis, design, development, implementation, evaluation. Research results (1) The analysis includes media analysis, student characteristics analysis, technology analysis, situation analysis, and data analysis. (2) Design includes determining the development team, compiling a development schedule, making flowcharts and making storyboards. (3) Development includes making a product which is then validated by a team of experts until it is validated. (4) Implementation, at this stage a product assessment is carried out by 2 chemistry teachers to see the agreement between the two teachers on the product developed through the kappa test, one-on-one trial with 2 groups of respondents consisting of 3 students in each group, small group trial with two groups of respondents carried out at MAN 2 Jambi City. This trial is not conducted face-to-face, but online (5) Evaluation, which is carried out at each stage is ongoing. The conclusion in this study is that the E-LKPD development procedure is in accordance with the 5 stages of the Lee & Owens development model. Keywords: E-LKPD, PBL-STEM, Science literacy skills

PEMANFAATAN BIOMASSA BATANG PISANG (Musa paradisiaca) YANG TERIMMOBILKAN PADA ABU BATU BARA SEBAGAI PENGADSORPSI ION LOGAM BESI (Fe) Saibun Sitorus; Otta Vianus
Jurnal Pendidikan Kimia (JPKim) Vol 6, No 3 (2014): Desember
Publisher : Pascasarjana Universitas Negeri Medan

Abstract The using of banana stem biomass (Musa paradisiaca) was immobility at ash coal as an adsorb in metal ions iron (Fe) have been researhed. The adsoption capacity determine of metal ions iron (Fe) used Isoterm Langmuir. The analysis of metal ions iron (Fe) by using spectrophotometer UV/Vis and characterization of fungtional group at biomass applies FTIR. The result of this research shows that banana stem biomasa (Musa paradisiacal) was immobility at as coal could adsorb metal ions iron (Fe). The optimum condition was achieved at the pH 5 (5,4196 mg/L), with optimum period of 60 minutes (5,4280 mg/L), proportion mass at 0,5:1 gram (5,5699 mg/L) and adsorption capacityof ion iron (Fe) (2,51004 mg/g). Fungtional groups in banana stem biomass (Musa paradisiaca) was immobility at ash coal as an adsorb in metal ions iron (Fe) be hydroxyl (-OH), carboksyl (-COO-), sylocsan and sylanol Keywords : Biomass, Musa paradisiaca, ash coal, ,adsorption, metal ions iron (Fe)

Practicality and effectiveness of student’s worksheet based on problem based learning to practice scientific literacy skill in matter acid and base Maftukhatun Nimah; Aprianto Aprianto; Nurul Hidayati; Rusly Hidayah
Jurnal Pendidikan Kimia (JPKim) Vol 9, No 3 (2017): Desember
Publisher : Pascasarjana Universitas Negeri Medan

The results of PISA's comperative studies show that the level of Indonesian science literacy is still low. From the results of the study stated that Indonesia is ranked 64 of 65 countries with a score of 382 science literacy on the study of natural science students. Necessary development of student’s worksheet to trace the ability of science literacy. The purpose of this research is to produce student’s worksheet based on problem based learning to trace the ability of science literacy which is practical and effective. The method used in this research is Research and Development (R&D). The results of the research have shown that student’s worksheet developed practical and effective. Student’s worksheet practicality seen from student response get good response equal to 94,99% with very good category. The effectiveness of student’s worksheet developed is seen from the gain score of the pre test and post test of the student.Key words: Student’s worksheet, practice, effective

Pengembangan Bahan Ajar Kimia Inovatif pada Pokok Bahasan Reduksi dan Oksidasi Berdasarkan Kurikulum 2013 Terintegrasi Pendidikan Karakter Elisabet Singarimbun; Ramlan Silaban; Retno Dwi Suyatni; Iis Siti Jahro; Manihar Situmorang
Jurnal Pendidikan Kimia (JPKim) Vol 7, No 2 (2015): Agustus
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. This study aims to determine: (1) whether the chemical innovative teaching materials developed for SMA / MA class X second semester on the subject of the oxidation reduction was decent and in accordance with the curriculum, 2013. (2) Does the use of innovative teaching materials chemistry development results provide results better learning for SMA / MA class X second smester with the students taught without the use of chemicals innovative teaching materials that have been developed based on the curriculum of 2013. (3) Does the use of innovative teaching materials chemistry results can foster the development of a better character to students SMA / MA X class second semester than students taught without the use of chemicals innovative teaching materials that have been developed based on the curriculum of 2013. This study uses qualitative data described through a questionnaire with eligibility sheet book contains indicators of assessment from the National Standards Body .Education (BSNP) and quantitative data to determine the effectiveness of the use of the results of Instructional Materials for learning outcomes and student character. The study population was all students in the second semester of class X SMA Negeri 1 Salapian, SMA 1 and SMA Kuala 1 Bahorok. The treatment sample of 2 classes of experimental class I and class II experiment at each school. Data collected by an objective test for student learning outcomes before and after the learning process, a questionnaire to measure the character sheet. Data were analyzed using SPSS 17.0 with a significance level of 0.05. The results of the assessment form validation mean to determine the feasibility of innovative teaching materials Oxidation Reduction. The results were obtained: (1) innovative teaching materials developed for the oxidation reduction SMA / MA class XI second semester was decent and in accordance with the curriculum in 2013 based on the results of the feasibility of standardizing the contents of 3.63, standardize language feasibility3.64, feasibility standardize the presentation of 3,66, standardization grafic of 3.67 (2) There are significant differences chemistry student learning outcomes SMA / MA Class X second semester is taught with the use of innovative teaching materials on the subject of chemical oxidation reduction that has been developed based on the curriculum in 2013 is higher than the student learning outcomes are taught without the use of innovative teaching materials on the subject of chemical oxidation reduction that has been developed based on the curriculum of 2013. (Sig.1-tailed <α (0.000 <0.05)) (3) There are significant differences of character development of students SMA / MA Class X second semester is taught with the use of innovative teaching materials on the subject of chemical oxidation reduction that has been developed based on the curriculum in 2013 is higher than the character development of students who are taught by without the use of innovative teaching materials on the subject of chemical oxidation reduction that has been developed based curriculum in 2013. Keywords: teaching material reduction of oxidation, front page, learning outcomes, communicative, responsibility jawab. kreativity

Perancangan Vaksin Virus Papilloma Manusia Tipe-16 Berbasis Epitop dengan Berbantukan Imunoinformatika Opik Taupiqurrohman; Muhammad Yusuf; Sukma Nuswantara; Toto Subroto
Jurnal Pendidikan Kimia (JPKim) Vol 8, No 3 (2016): Desember
Publisher : Pascasarjana Universitas Negeri Medan

Abstrak. Sampai saat ini vaksinasi dianggap sebagai cara yang efektif dalam mencegah penyakit menular. Semua proses vaksinasi bekerja dengan menampilkan antigen asing terhadap sistem imun agar respon sistem imun bangkit. Bahan aktif vaksin dapat berbentuk patogen utuh (bakteri atau virus) yang dilemahkan, atau komponen patogen yang imunogenikdantelah dimurnikan. Pendekatan konvensional dalam pengembangan vaksin membutuhkan biakan mikroorganisme patogen dan diseksi dengan menggunakan teknik biokimia, imunologi, dan metode mikrobiologi dalam mengidentifikasi komponen penting terhadap sistem imunitas. Metode ini telah berhasil dalam berbagai kasus, namun gagal memberikan solusi bagi banyak patogen yang belum dapat dibuatkan vaksinnya. Dewasa ini, dimungkinkan menggunakan informasi genomik untuk mempelajari perancangan vaksin secara in silico, tanpa perlu membiakan mikroorganisme patogen. Pendekatan yang telah diberi nama 'vaksinologi terbalik' ini dapat mengurangi waktu yang dibutuhkan untuk identifikasi kandidat vaksin dan memberikan solusi baru bagi vaksin-vaksin yang selama ini sulit dikembangkan.Meningkatnya pemahaman mengenai pengenalan antigen pada tingkat molekul, telah berdampak pada pengembangan desain rasional vaksin berbasis peptida atau epitop. Konsep vaksin peptida didasarkan pada identifikasi dan sintesis kimia epitop sel-B dan sel-T yang imunodominan, yang dapat menginduksi respon imun spesifik. Perkembangan yang cepat dari teknik bioinformatika dan aplikasinya dengan sejumlah besar data eksperimen telah melahirkan bidang baru, disebut imunoinformatika. Imunoinformatika adalah cabang dari bioinformatika yang berkaitan dengan analisis in silico serta pemodelan data imunologi dan masalahnya. Kajian ini bertujuan untuk merancang vaksin virus papilloma manusia berbasis epitop berbantukan imunoinformatika. Kata Kunci: vaksin, virus papilloma manusia, bioinformatika, imunoinformatika, epitope

Utilization of leaf and fruit extracts of kedondong (Spondias dulcis Forst) as a supporting material for energy conversion in dye sensitized solar cells and electrochemical cells Agus Malik Ibrahim; Boima Situmeang; Ahmad Rifa’i; Afif Hidayatul Mustafid
Jurnal Pendidikan Kimia (JPKim) Vol 13, No 1 (2021): April
Publisher : Pascasarjana Universitas Negeri Medan

This study aims to obtain a dye sensitized solar cell (DSSC) prototype and a voltaic cell prototype using the kedondong plant (Spondias dulcis Forst). Kedondong leaves as a source of chlorophyll were deliberately chosen to be in line with the use of kedondong fruit as a material for electrochemical cells, so that two research results could be obtained from the kedondong plant. This research is for the application of scientific development, increasing the added value of kedondong plant, and as support for the use of environmentally friendly energy. Research methods in general are chlorophyll extraction, citric acid isolation, chlorophyll testing, DSSC assembly, electrochemical cell assembly, and performance testing for both DSSC and electrochemical cells. The analysis results show that typical peaks appear for the functional groups in chlorophyll at certain wave numbers. Hydroxyl (-OH) groups appear in the range of 3650 - 3200 cm-1, the C=C group at 1700 - 1500 cm-1, the C-N group at 1350 - 1000 cm-1, and the C-O group at 1300 - 1000 cm-1. Quantitative testing used a UV-Vis spectrophotometer at 645 nm and 633 nm, the results obtained were chlorophyll a was 4.52 mg/L, chlorophyll b was 8.43 mg/L, and total chlorophyll was 12.95 mg/L. The DSSC prototype performance test with a size of only 2.5 cm2, can produce a minimum voltage of 30.1 mV and a maximum of 280 mV. The electrochemical test of kedondong citric acid extract showed that the value of the electric voltage ranged from 121 to 630 mV.Keywords: Kedondong, Chlorophyll, DSSC, Citric acid, Electrochemical cells

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