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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 8 Documents

Search results for , issue "Vol 13, No 2 (2021): August" : 8 Documents clear

Improving chemical learning outcomes with explicit instruction learning models with quizizz evaluation media Bropson Minanlarat; Leony Sanga Lamsari Purba; St Fatimah Azzahra
Jurnal Pendidikan Kimia (JPKim) Vol 13, No 2 (2021): August
Publisher : Pascasarjana Universitas Negeri Medan

This study aims to determine the effect of explicit instruction learning models and the percentage of student learning outcomes improvement in chemistry. Explicit instruction learning model is the free variable while the dependent variable is learning outcomes. This research method is a quasi experiment with the research design nonequivalent control group design. The population of this study were students of Senior High School 42 Jakarta, the sample was selected by purposive sampling technique, consisting of two classes, namely class XI MIA 1 as the experimental class and XI MIA 2 as the control class. The results of the ttest show that the sig. (2-tailed) is smaller than the α value, namely sig 0.000 < sig 0.05, so learning using the explicit instruction model has a significant effect on improving chemistry learning outcomes on hydrocarbon compound material. In addition, the use of explicit instruction learning models can improve student learning outcomes by 19% when compared with the use of conventional learning models (TCL).Keywords: Explicit instruction, Quizizz, Chemistry learning, Learning outcomes

Stability of Styrax benzoin extract and fraction with the addition of glycerol and tween 80 Dedi P Simatupang; Nora Susanti; Jamalum Purba
Jurnal Pendidikan Kimia (JPKim) Vol 13, No 2 (2021): August
Publisher : Pascasarjana Universitas Negeri Medan

This research to decide the consequences of expanding the steadiness of the concentrate and part of incense with the expansion of glycerol and tween 80 by contrasting the reference tests of frankincense separates available. The technique utilized in this examination depends on the expansion of glycerol and tween 80, just as directing boundaries of consistency, organoleptic, pH and investigation of substance content of concentrates and parts with GC-MS instruments. The outcomes got in this investigation demonstrate the actual properties of the concentrate and part of the incense sap as a thick fluid, earthy red and has an unmistakable fragrant smell. The consistency got from the thickness test was 277.68 Cp. In the meantime, the thickness estimation consequences of the reference test acquired a consistency worth of 326.54 cP. What's more, has a pH scope of 4.0-5.5. The fundamental synthetic parts of the extraction results and the isoprophyl part of styrax benzoin and the reference part of the reference styrax benzoin remove dependent on the consequences of the investigation discovered 6 mixtures that share practically speaking, in particular Benzoic corrosive, Vanillin, trans-Cinnamic corrosive, (Z) - Cinnamyl benzoate, 2-Propenoic corrosive , 3-phenyl-, phenylmethyl ester, (E) - and Cinnamyl cinnamate. Keywords: Styrax benzoin, Glycerol, Extract stability, Tween 80, Fractionation

Development of student worksheet for blended learning based guide inquiry and science process skill in reduction and oxidation reaction Sinda Febrilia Miharti; Harizon Harizon; Zurweni Zurweni
Jurnal Pendidikan Kimia (JPKim) Vol 13, No 2 (2021): August
Publisher : Pascasarjana Universitas Negeri Medan

This study aims to determine how the procedure for developing blended learning worksheets based on guided inquiry models and science process skills on the material of reduction and oxidation reactions in SMK. The method used in this research is to follow the Lee and Owens development model consisting of 5 stages of development, namely Analysis, Design, Development, Implementation and Evaluation. Analysis includes analysis of needs, characteristics of students, objectives, materials and technology. Design, researchers determine the schedule and development team, median specifications, prepare materials and make Flowcharts and storyboards. Development, develop LKPD according to storyboards, validated by material and media experts, and assessed by the teacher. Implementation includes group trials and effectiveness tests. Evaluation of LKPD in accordance with test results. Keywords: Blended learning, Guide inquiry, Reaction of reduction and oxidation, Science process skill, Student worksheet

Antibacterial activity test of Simargaolgaol (Aglaonema modestum Schott ex Engl) leaves extract against Escherichia coli and Salmonella typhi bacteria Tiurma Solomasi Zega; Putri Mandaoni Pakpahan; Rahmayani Siregar; Givinda Sitompul; Saronom Silaban
Jurnal Pendidikan Kimia (JPKim) Vol 13, No 2 (2021): August
Publisher : Pascasarjana Universitas Negeri Medan

The Simargaolgaol (Aglaonema modestum Schott ex Engl) plant is a plant that grows wild in Barus District, Central Tapanuli, North Sumatra which is used by the community as a medicinal plant. This study aims to determine the antibacterial activity of n-hexane, ethyl acetate and ethanol extracts from Simargaolgaol leaves against Escherichia coli and Salmonella typhi bacteria. The antibacterial activity test of Simargaolgaol leaves was carried out using the disc diffusion method. The results of antibacterial activity showed that the highest inhibitory power of Simargaolgaol leaf extract was ethanol extract (polar), ethyl acetate extract (semi polar) and n-hexane extract (non polar). The inhibitory power of ethanol extract, ethyl acetate, and n-hexane against Escherichia coli bacteria was 13.1 mm (strong); 9.7 mm (medium); 8.0 mm (medium) and for Salmonella typhi bacteria respectively 11.2 mm (strong); 10.7 mm (strong) and 9.3 mm (medium). With the concentration of the extract in the diameter is 10%. Based on this, it can be concluded that Simargaolgaol leaf extract has potential as an antibacterial.Keywords: Aglaonema modestum Schott ex Engl, Antibacterial activity, Escherichia coli, Salmonella typhi

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

Paper making and characterization from waste coconut and tofu dregs Erdiana Gultom; Hestina Hestina; Nova Florentina; Barita Aritonang
Jurnal Pendidikan Kimia (JPKim) Vol 13, No 2 (2021): August
Publisher : Pascasarjana Universitas Negeri Medan

Research on paper made from coconut and tofu waste has been carried out using the alkalization method of separation technique, with the optimum composition as follows: NaOH concentration used is 3.0% and cooking temperature is 100 0C and the time required is 90 minutes. The results of the catheterization test of paper made from coconut dregs and tofu have a water content of 3.2%; pH 6.9, pulp content 65.75%; cellulose content 80.22%; lignin content 18.27%. The results of the FT-IR spectrum analysis of coconut pulp and tofu pulp are suitable for use as raw materials for making paper because they contain cellulose fibers. This is indicated by the appearance of the O-H hydroxyl group which is observed at a wavenumber of 3312 cm-1. Based on the SEM results, the surface morphology of the coconut pulp and tofu combination paper shows that the surface structure is the denser the fiber bonds, the smaller the fiber diameter, the better the mechanical properties. The results of the research conclusions explain that, paper made from coconut and tofu waste has met the requirements set by SNI 14-0444-1989.Keywords: Paper, Cellulose, Coconut pulp, Tofu pulp, Lignin

Microsoft teams 365 and online learning: The student’s perception Leony Sanga Lamsari Purba
Jurnal Pendidikan Kimia (JPKim) Vol 13, No 2 (2021): August
Publisher : Pascasarjana Universitas Negeri Medan

study aims to determine the effectiveness of online learning using Microsoft Teams 365. The entire population in this study was used as a research sample, namely all students of the Chemistry Education study program, Indonesian Christian University, Jakarta. Perception data was collected using a questionnaire with dimensions of understanding the material, appearance and accessibility of Microsoft Teams 365. From the results of data processing, it was found that more than 50% of students' perceptions of Microsoft Teams 365 were good in all indicators of understanding the material and appearance. On the use dimension with connectivity and accessibility indicators more than 50% of students' perceptions of the Microsoft 365 team are good, but on the quota-saving indicator 42% of students do not agree. Keywords: Microsoft teams, E-learning, Cemistry

Determination of phenolic contents and antioxidant activity test of ethanol extract of Sirih merah (Piper crocatum Ruiz & Pav.) leaves using the DPPH method Kasta Gurning; Sifikal Lumbangaol; Risanti F. R Situmorang; Saronom Silaban
Jurnal Pendidikan Kimia (JPKim) Vol 13, No 2 (2021): August
Publisher : Pascasarjana Universitas Negeri Medan

The research objectives were to identify the secondary metabolite components, total phenolic content and determine the antioxidant activity of the ethanol extract of red betel leaf (Piper crocatum Ruiz & Pav.). The extraction process was carried out by materation using ethanol as a solvent. Determination of total phenolic content was carried out colorimetrically with Folin-Ciocalteu reagent measured at a maximum wavelength of 765 nm. Determination of antioxidant activity using the DPPH method measured by spectrophotometry at a maximum wavelength of 517 nm. The results of phytochemical screening of the ethanolic extract of red betel leaf contain secondary metabolites, including flavonoid, phenolic, tannin, alkaloids, steroids, and triterpenoids. The total phenolic content of the red betel leaf ethanol extract was 0.949±0.003 mg GAE/g d.w. and has antioxidant activity (IC50) 84,656 including strong category as an antioxidant. Keywords: Piper crocatum Ruiz & Pav., Antioxidant, Ethanol extract, Folin-Ciocalteu and DPPH

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Kota medan,

Sumatera utara

INDONESIA