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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.
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Articles 6 Documents
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Search results for , issue "Vol 12, No 2 (2020): August" : 6 Documents clear
Determination antioxidant activities methanol extracts of bangun-bangun (Coleus amboinicus L.) Leaves with DPPH method Kasta Gurning
Jurnal Pendidikan Kimia (JPKim) Vol 12, No 2 (2020): August
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (365.93 KB) | DOI: 10.24114/jpkim.v12i2.19397

Abstract

Bangun-bangun (Coleus amboinicus Lour.) leaves is a plant that has various types of active compounds that can be utilized in various fields of health and food. The purpose of this research is to determine the components of the active compound contained in the sample when extract with methanol by maceration method and antioxidant activity test with DPPH method using a UV-Vis spectrophotometer. The value of antioxidant activity is determined by the amount of ability to inhibit 50% concentration of free radicals from DPPH. Phytochemical screening results of methanol extract active compounds contained alkaloids, tannins, flavonoids, terpenoids and steroids, as well as phenolic & polyphenols. The test activity of methanol extract of Coleus amboinicus leaves and ascorbic acid in the amount of 38.83 and 4.18 included in the very strong category as antioxidants. The extract of Coleus amboinicus leaves has lower activity compared to ascorbic acid and has the potential to be used as a natural antioxidant in preventing and minimizing the effects of free radicals. Keywords: Coleus amboinicus Lour, Antioxidant, Methanol extract, IC50, DPPH
Phytochemical screening of bunga rosella (Hibiscus sabdariffa L) and antimicrobial activity test Hermawan Purba; Helen Anjelina Simanjuntak; Risanti Situmorang
Jurnal Pendidikan Kimia (JPKim) Vol 12, No 2 (2020): August
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (289.42 KB) | DOI: 10.24114/jpkim.v12i2.19398

Abstract

The purpose of this study was to determine the antimicrobial activity of rosella infusa (Hibiscus sabdariffa L.). Antimicrobial inhibition test using infusa of rosella (Hibiscus sabdariffa L.) against Staphylococcus aureus and Escherichia coli bacteria at a concentration of infusa 100%; 75%; and 50%. The concentration has highest potential antibacterial of infusa for Staphylococcus aureus is 100% witch has diameter of 13.6 mm and for Escherichia coli bacteria is 100%, its show that diameter of zone inhibitory zone is 13.3 mm. The Results of phytochemical screening show that infusa of rosella (Hibiscus sabdariffa L.) contains flavonoids, saponins, and tannins. Based on the data above show that the infusa of rosella flower has high antibacterial potential. Keywords: Hibiscus sabdariffa L., antimicrobial activity, Staphylococcus aureus, Escherichia coli
Sensitivity of two-tier and three-tier tests in detecting student’s misconceptions of chemical bonding Ebiati Ebiati; Asrial Asrial; Muhammad Haris Effendi-Hasibuan
Jurnal Pendidikan Kimia (JPKim) Vol 12, No 2 (2020): August
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (292.58 KB) | DOI: 10.24114/jpkim.v12i2.19405

Abstract

This research study aims to determine how the sensitivity of two-tier and three-tier tests in detecting student’s misconceptions about chemical bonding. This research is a quantitative study with a total sampling technique that is measured using three-tier multiple-choice with a modified CRI. Based on the findings, with a two-tier multiple-choice, the percentage value of the understanding category is 86.06%, misconceptions are 6.89%, and do not understand is 7.06%. Meanwhile, using a three-tier multiple-choice, the percentage value of the understanding category is 85.33%, misconception amounted to 7.61%, and did not understand 7.06%. This study concludes that three-tier multiple-choice is more sensitive than two-tier multiple-choice in detecting students' misconceptions of chemical bonding. Keywords: Chemical bonding, Misconception, Three-tier, Two-tier
The effect of portfolio-based learning models and self-regulated learning on student’s creative thinking skills on acid and base materials Rini Alfiahas; Asrial Asrial; Damris Muhammad
Jurnal Pendidikan Kimia (JPKim) Vol 12, No 2 (2020): August
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (269.195 KB) | DOI: 10.24114/jpkim.v12i2.19406

Abstract

The acid and base concepts are fundamental in understanding chemistry taught at senior high schools. The chemistry concepts are generally abstract and sometimes complex. Teachers are required find ways that lead to improve their students understanding. This study aimed to look at the effect of portfolio-based learning model and self regulated learning on students creative thinking skills on acid and base teaching materials. Data of students creative thinking skills were collected with test and self-regulated learning with questionnaire. The data analysed with two-way ANOVA shows that the portfolio-based learning models and students self-regulated learning have a positive effect on the students' creative thinking skills in the material taught. However, both are independent and do not interact each others in affecting the student creative thinking skills.Keywords: Acid and base, Creative thinking skills, Portfolio based learning model, Self regulated learning
Identification of metal content in food using gravimetric and iodometric methods: The case on children's food Nelius Harefa; Saronom Silaban
Jurnal Pendidikan Kimia (JPKim) Vol 12, No 2 (2020): August
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (396.277 KB) | DOI: 10.24114/jpkim.v12i2.19395

Abstract

The metal content is one indicator of the eligibility of food consumption, including food for children. In this research, identification of Lead (Pb), Mercury (Hg), Cadmium (Cd), and Arsenic (As) metals on pentol, bakso, cilok, cireng, and cimin samples by gravimetric and iodometric methods. The identification of metals by the gravimetric method shows that the metal content in all samples is below the threshold, where the highest metal content is the lead metal in the cimin sample of 0.0439 mg/kg. The identification of metals by the iodimetry method showed that the metal content in all samples was below the threshold, where the highest metal content is the lead metal in the cimin sample of 0.0436 mg/kg. Thus, all samples are categorized as safe for consumption.  Keywords: Gravimetric, Iodometric, Metals content
The effect of the flipped classroom approach and self-efficacy on a guided inquiry on students' creative thinking skills Dian Indah Lestari; Muhammad Haris Effendi-Hasibuan; Damris Muhammad
Jurnal Pendidikan Kimia (JPKim) Vol 12, No 2 (2020): August
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (342.888 KB) | DOI: 10.24114/jpkim.v12i2.19435

Abstract

This study aims to look at the effect of the flipped classroom approach on the guided inquiry model and student's self-efficacy on creative thinking skills on the reaction rate material. The study was conducted in class XI MIA SMA N 3 Jambi City with a 2 x 2 factorial design and the sample consisted of 2 classes chosen randomly. Data collection using test techniques, namely essay tests, includes indicators of creative thinking and non-tests, namely self-efficacy questionnaire data and field notes during the study. Analysis of the data used is 2-way ANOVA. The results showed that guided inquiry learning with the flipped classroom approach and high self-efficacy categories had high creative thinking abilities, but there is no interaction between learning models with self-efficacy towards creative thinking abilities on the reaction rate material because learning models and self-efficacy affect the results of students' creative thinking abilities independently. Based on the results of the study it can be concluded: (1) There is an influence of the flipped classroom approach on the guided inquiry model of students 'creative thinking abilities on the reaction rate material (2) There is an effect of students' self-efficacy on the ability to think creatively on the material reaction rate (3) There was no interaction between the learning model and students' self-efficacy.Keywords: Creative thinking skills, Flipped classroom, Guided inquiry, Reaction rate, Self-efficacy

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