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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.

Arjuna Subject : -

Articles 267 Documents

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Functionalization of cyclic natural rubber grafted maleic anhydride (cnr-g-ma) with variation of ma concentration, inisiator and reaction time Boy Chandra Sitanggang; Eddyanto Eddyanto
Jurnal Pendidikan Kimia (JPKim) Vol 11, No 3 (2019): December
Publisher : Pascasarjana Universitas Negeri Medan

Cyclic natural rubber have low compatibilities when mixed with other polymer. The compatibility of a cyclic natural rubber (CNR) could be increased through grafted functional monomer to the polymer backbone. This research aims to know about influence of maleic anhydrate concentration (3-15 phr) as monomer, concentration of benzoyl peroxide (0.05-0.2 molar ratio) as initiator and times (15-90 minute) towards grafting degree of maleic anhydride. The research conducted with reflux in oil bath, at constant temperature 110ºC. The grafting degree determined with titration method and FTIR analysis used to show the existence of grafted maleic anhydrate onto cyclic natural rubber. Result of FTIR analysis showed that grafted anhydrate to cyclic natural rubber assigned with the presence of carbonyl absorptions (C=O stretching). Result titration showed that concentration of maleic anhydrate and benzoyl peroxide enhanced as well as grafting degree. While for variation of time, optimum grafting degree achieved at 60 minute.Keywords: Grafting; inisiator; natural rubber; polymer

Implementation of Cooperative Learning Model STAD (Student Teams Achievement Division) Integrated Media on Students Learning Outcomes in The Matter of Salt Hydrolysis Derin Putri Sianipar; Indriati Aulia; Ajat Sudrajat
Jurnal Pendidikan Kimia (JPKim) Vol 8, No 3 (2016): Desember
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. This study aims to investigate the differential of students’ learning outcome in salt hydrolysis between cooperative learning model type STAD (Student Teams Achievement Division) integrated Concept Map media, Powerpoint and Macromedia Flash. Population in this study was all students in grade XI IPA at SMAN 8 Medan Academic Year 2015/2016. Sample of this study consist of 3 classes that were collected in purposive sampling and using RAL (completely randomized design). The data that were collected are students’ learning outcomes. It was collected by using research instrument that is objective test with five answer choices. Based on validation test’s result, reliability, difficulty level test, power difference test, and instrument test’s distractor, then from 40 questions, 21 of it has been qualified but only 20 were used in this study. The result showed there was a difference of students’ learning outcomes in salt hydrolysis between cooperative learning model type STAD (Student Teams Achievement Division) integrated Concept Map media, Powerpoint and Macromedia Flash. The data that were collected are Fcount> Ftable (13,37> 3,10) and sign(0,00) < α (0,05). With mean values 70,16 (Experiment 3), 69,83 (Experiment 2), and 57,83 (Experiment 1) or in other words Macromedia Flash > PPT >Concept Map. Keywords: learning outcome, Cooperative Type STAD, media

Learning buffer solution based on virtual lab in senior high school Gulmah Sugiharti; Aldhi Kurnia
Jurnal Pendidikan Kimia (JPKim) Vol 13, No 1 (2021): April
Publisher : Pascasarjana Universitas Negeri Medan

This study aims to determine whether there is a difference between the use of virtual lab and real lab media in guided inquiry learning on learning outcomes in the buffer solution material. Both learning media are taught using the same learning model, namely the guided inquiry learning model. The samples in this study were class XI MIPA 3 as the experimental I which was taught with the guided inquiry learning model using virtual lab media and class XI MIPA 6 as the experimental II which was taught by guided inquiry learning model using real lab. The instrument used in this research was a test of learning outcomes chemistry of the buffer solution material. The data analysis technique for hypothesis testing was the two-party t-test statistic. The results of data processing showed that the experimental I had a pretest mean of 26.04 and a mean of posttest 79.53, while the experimental II had a mean pretest of 47.95 and a mean of posttest of 72.84. Hypothesis testing was carried out using two-party t test from the learning outcomes data and it was obtained tcount = 2.201 while ttable = 1.988 for α = 0.05 so that tcount> ttable. So Ha accept, that is, there are differences in student learning outcomes taught by guided inquiry models using virtual lab and real lab media. Meanwhile, the increase in student learning outcomes in guided inquiry classes using virtual labs was 72%, and those using real labs were 52%.Keywords: Virtual lab, Real lab, Guided inquiry, Buffer solutions

PENYEDIAAN MODUL PEMBELAJARAN INOVATIF LARUTAN ELEKTROLIT NONELEKTROLIT MERUJUK MODEL PEMBELAJARAN BERBASIS MASALAH Ramlan Silaban; Renata Hutagalung; Freddy T.M. Panggabean; Dewi Syafriani
Jurnal Pendidikan Kimia (JPKim) Vol 6, No 3 (2014): Desember
Publisher : Pascasarjana Universitas Negeri Medan

Abstract This study aims to compose a innovative electrolyte and non electrolyte learning module and to know its effect on student learning outcomes. The two class student of Xth class from SMA Negeri 7 Medan used as a sample, which both as experimental class teach by PBL model using innovative modules and control class by original text books. The research data analyzing by descriptive and inferential statistics methods. By this research, we had take an innovative electrolyte and non electrolyte learning module which composed by Borg& Gall procedure and had been standardized by Indonesian National Standard Education Bureau (BNSP). The result data show that student learning outcomes of experimental class prestest is 40.75 and postest 79.375 mean score, and control class pretest was 54.37 posttest and 73.875 mean score. Based on rejection of hypothesis show that student learning outcomes which teach by innovative module is higher than using original textbook. Keywords : Innovative learning module, student learning outcomes, Problem Based Learning

Activity antibacterial to Escherichia coli and antioxsidant of extract water of leaf binara plant (Artemisia vulgaris L.) after blanching Lia Febrina; Ida Duma Riris; Saronom Silaban
Jurnal Pendidikan Kimia (JPKim) Vol 9, No 2 (2017): Agustus
Publisher : Pascasarjana Universitas Negeri Medan

Binara (Artemisia vulgaris L.) merupakan salah satu jenis tumbuhan yang dimanfaatkan sebagai obat dan banyak terdapat di Kabanjahe, Kabupaten Karo, Sumatera Utara. Masyarakat Karo secara turun temurun menggunakan tanaman ini sebagai obat diare.Penelitian ini bertujuan untuk mengetahui daya hambat antibakteri dan aktivitas antioksidan dari ekstrak daun binara hasil blanching yang menggunakan pelarut air dalam proses ekstraksi secara refluks. Uji aktivitas antibakteri dilakukan terhadap bakteri Escherichia coli ATCC 25922 (gram negatif) menggunakan metode difusi. Ekstrak air daun binara yang diuji adalah konsentrasi 0%; 2,5%; 5%. Aktivitas antibakteri diukur dari luas diameter zona bening disekitar sumur. Hasil penelitian menunjukkan ekstrak air daun binara memiliki aktivitas antibakteri berturut-turut pada konsentrasi 0%; 2,5%; dan 5% adalah 0 mm; 18 mm; dan 25,2 mm. Sebagai kontrol positif digunakan kloramfenikol dan diperoleh daya hambat antibakterinya sebesar 28 mm. Uji antioksidan dilakukan dengan metode peredaman DPPH (1,1-diphenyl-2-picrylhydrazil). Hasil penelitian menunjukkan aktivitas antioksidan ekstrak air daun binara termasuk sedang (% inhibisi 45,24% dan IC50 114,23 ppm) dan sebagai kontrol positif digunakan vitamin C (% inhibisi 56,27% dan IC50 72,75 ppm).Kata kunci: antibakteri, antioksidan, Artemisia vulgaris L., Escherichia coli ATCC 25922, metode DPPH

Pengaruh Kadar Raksa Dalam Rambut Terhadap Keparahan Gejala Autisme pada Anak yang Mengalami Gangguan Autistik Ellyta Aizar; Yahwardiah Siregar; Zul Alfian
Jurnal Pendidikan Kimia (JPKim) Vol 7, No 3 (2015): Desember
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. Autistic Disorder can happen due to neurological expressions as the effects of environmental poisons in children who had genetical deficiency history. Current study found that increasing of mercury (Hg) concentration in hairs had significant correlation towards increasing of autisme level of severity. Hair analysis may identify the history of mercury’s exposure in human. This analytical correlational descriptive study aimed to identify mercury (Hg) concentration in children with autistic disorder at YAKARI Autism Foundation in Medan and at State Disability School in Binjai. This study also aimed to analyze the correlation between the Hg concentration and the symptoms’ level of severity. Hair samples were taken from 17 children with autistic disorder and 17 normal children (at similar age and sex). Mercury concentrations were analyzed by using ICP-OES. CARS were used to examine the autism symptoms’ level of severity. Majority of autistic disorder subjects (70.6%) had severe autism symptoms. Mean of Hg concentrations in autism subjects was 1,82 ppm ± 0,52 and in normal subjects was 0,91 ppm ± 0,68. Furthermore, mean of Hg concentrations in autistic disorder subjects was significantly higher than in normal subjects (p < 0,05). However, there was no significant difference on Hg concentrations between mild-fair and fair-severe autistic subjects’ categories. The findings of this study explain that the severity of autism symptoms in the autistic disorder subjects do not influenced by Hg concentrations within their body. Therefore, unidentified factors in this study might be contribute to the severity of autism symptoms. Future studies related epigenetics need to be conducted in order to explore another factors contribute to the severity of autism symptoms. Keywords: autistic disorder, CARS, mercury (Hg), hair analysis

Implementasi Bahan Ajar Kimia Terintegrasi Nilai Spiritual Dengan Model Pembelajaran Problem Based Learning (PBL) Berorientasi Kolaboratif Untuk Meningkatkan Hasil Belajar Siswa Heppy Okmarisa; Ayi Darmana; Retno Dwi Suyanti
Jurnal Pendidikan Kimia (JPKim) Vol 8, No 2 (2016): Agustus
Publisher : Pascasarjana Universitas Negeri Medan

Abstract. This Study aims to determine: (1) is there a difference between the increas student learning outcomes are taught using chemistry teaching materials integrated spiritual with using chemistry teaching materials SMA/MA with Problem-Based Learning (PBL) model oriented Collaborative. (2) whether are chemistry teaching materials integrated spiritual can effectively develop student’s spiritual. (3) whether there is a relationship between spiritual values with improved learning outcomes. Sample in this study is two classes. Research instruments in the form of a multiple choice test of 25 item that valid and reliable (0,84), questionnaire and observation sheet are used measure the spiritual attitude. The data analysis using consist of Independent Sample T-test, Correlation and Regression of SPSS 21 for windows with 0,05 significance level. The result of research and testing indicate : (1) Improving student learning outcomes are taught using chemistry teaching materials integrated spiritual higher that the results of learning by the chemistry teaching materials SMA/MA with Problem-Based Learning (PBL) model oriented Collaborative (p = 0,000 < 0,05), the average value of the N-Gain experimental class 1 is 80 % and experimental class 2 is 66 %, (2) chemistry teaching materials are developed to grow spiritual values in students, (3) there is a relationship between the spiritual value to student learning outcomes. Keyword: learning, spiritual values, teaching materials, problem-based learning-oriented collaborative

Students perception and interest on chemistry: Learning evaluation integrated quizziz media Nelius Harefa; Marudut Sinaga; Saronom Silaban
Jurnal Pendidikan Kimia (JPKim) Vol 12, No 3 (2020): December
Publisher : Pascasarjana Universitas Negeri Medan

Interest in learning is a passion or a great desire for something that is closely related to personality, motivation, expression and self-concept, identification, heredity, and external factors. Interest in learning affects the cognitive, affective, and psychomotor aspects of students. In this study, analyzed and interpreted student interest in learning through media-based learning Quizizz and students' perceptions of the media. Based on the analysis and interpretation of the data, indicators of student interest in the media Quizizz increased by 0.818 in the high category, indicators of student attention increased by 0.555 in the medium category, indicators of feelings of pleasure increased by 0.684 in the medium category, and indicators of student involvement increased by 0.599 in the medium category. Also, 76.32% of students thought that Quizizz media were very interesting, 50% thought that Quizizz media were easily applied, 86.84% thought that Quizizz media accommodate students to compete fairly, and 44.74% thought that Quizizz media were practically applied. Thus, students have a good perception of the Quizziz media accompanied by increased interest in learning.Keywords: Learning evaluation, Students’ perceptions, Students’ interest, Quizziz media

PERBEDAAN HASIL BELAJAR KIMIA SISWA MENGGUNAKAN MODEL PEMBELAJARAN TGT (TEAMS GAMES TOURNAMENT) DENGAN MEDIA MIND MAPPING DAN MOLYMOOD PADA POKOK BAHASAN HIDROKARBON Ratna Sari Dewi
Jurnal Pendidikan Kimia (JPKim) Vol 7, No 1 (2015): April
Publisher : Pascasarjana Universitas Negeri Medan

Abstract This research was purpose to know the effect of TGT (Team Games Tournament) learning model with Molymood to student chemistry learning outcomes on teaching Hydrocarbon. The type of this research is quasy-experiment using random group pretest-posttest design. The 2 class of X students of some SMA Negeri in Medan used as a sample, a class was teach by TGT model using mind mapping media and another with molymood media. The research data analysed using two side T-test. The research result show that there is a differences of student learning outcomes between student teach using TGT model with mind mapping media accompanying molymood media. It shows that the student teaching by TGT model using molymood give increasing learning output approx 70.9%, while TGT model with mind mapping media 54.2% Keyword: Teams Games Tournaments (TGT), Mind Mapping, Molymood, Hydrocarbon

Tin Dioxide Thin Films As Carbon Monoxide Sensor Yati B Yuliyati; Rubianto A Lubis; Atiek R Noviyanti; Nia Kurniatin
Jurnal Pendidikan Kimia (JPKim) Vol 9, No 1 (2017): April
Publisher : Pascasarjana Universitas Negeri Medan

Abstract: This research aims to create SnO2 thin films that have the size of micrometers to nanometers for detecting CO gas. The method used in this research is a sol-gel method where all precursors such as tin dichloride, distilled water, ethanol, and ammonium fluoride 5%-10% (w/w) are mixed together to form a colloidal system. The colloidal systems with the addition of palladium are precipitated on a glass substrate. The substrate is heated at the temperature of 70oC and 100oC. Then the resistance value is determined using the avometer. The SnO2 thin films are characterized by SEM and XRD. The result of this research is that SnO2 thin films show the best sensitivity in colloidal systems with the addition of ammonium fluoride 10% (w/w). The result of the characterization of SEM and XRD concludes that SnO2 thin films can be obtained by a sol-gel method with a nanometer-scale size and it can respond to the CO gas. Keywords: carbon monoxide, metal oxides, sol-gel method, thin films

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