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Hydrogen: Jurnal Kependidikan Kimia
Published by IKIP Mataram
ISSN : 23386487     EISSN : 26563061     DOI : -
Core Subject : Science, Education,
Chemistry Education
Hydrogen: Jurnal Kependidikan Kimia diterbitkan oleh Program Studi Pendidikan Kimia yang memuat tulisan yang diangkat dari hasil penelitian dan kajian konseptual di bidang Kimia dan Pendidikan Kimia.
Arjuna Subject : -
Articles 100 Documents
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EFEKTIVITAS MODUL INKUIRI DENGAN STRATEGI KONFLIK KOGNITIF DALAM MENINGKATKAN KETERAMPILAN BERPIKIR KRITIS MAHASISWA Pahriah, Pahriah; Hendrawani, Hendrawani
Hydrogen: Jurnal Kependidikan Kimia Vol 7, No 2 (2019): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v7i2.1796

Abstract

The purpose of this study is to evaluate the effectiveness of the application of inquiry modules with cognitive conflict strategies in chemical bonding material in improving students' critical thinking skills. This research is a quantitative descriptive study that was carried out with the design of one group pretest posttest. The sample used was 26 students who took general chemistry courses with a purposive sampling technique. Data were analyzed by normalized N-gain method and paired samples t-test. The result of this study showed that average N-gain of student critical thinking skill after application of inquiry modules with cognitive conflict strategies is 0.6 with medium category. Average score of student critical thinking skill after treatment (74,12) is significantly higher than before (35,77) that proved by t statistic (41,09) higher than t critic (1,71) with df = 25 and p = 0,000 on one tail t-test. Therefore, it was concluded that the application of inquiry modules with cognitive conflict strategies enhance student critical thinking skill on chemical bonding material learning effectively.
UJI AKTIVITAS ANTIBAKTERI STAPHYLOCOCCUS AUREUS DAN SALMONELLA TYPHI DARI HASIL MIKROENKAPSULASI MINYAK ATSIRI ROGO (PREMNA SERRATIFOLIA LINN) Nursin, Nursin; Nurliana, Laily; Imran, Imran; Musta, Rustam
Hydrogen: Jurnal Kependidikan Kimia Vol 7, No 2 (2019): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v7i2.1916

Abstract

Antibacterial activity test Staphylococcus aureus and Salmonella typhihas been performed by microencapsulation product of rogo essential oil (Premnaserratifolia Linn). This study aims to determine rogo oil activity test and microencapsulation results as antibacterial S. aureus and S. typhi. The results of antibacterial activity of rogo liquid oil to S. aureus and S. Typhi bacteria showed different inhibitory power of each concentration variation of 12.5%, 25%, 50% and 100% with 100% concentration as the best inhibitor for both bacteria. While the antibacterial activity test of S. aureus and S. typhi from microencapsulated rogo oil: maltodextrin showed the difference of each variation of concentration 1:10; 1:12; 1:14; 1:16 and 1:18 with a 1:14 composition of S. aureus and 1:18 in S. typhi as the best ratio of activity power. The antibacterial activity test between liquid rogo oil and microencapsulated result shows the difference, but it can be concluded that the inhibitory power of rogo oil from microencapsulation is more inhibited than 100% rogo oil.
SINTESIS METIL ESTER NITRAT DARI MINYAK BIJI NYAMPLUNG (CALOPHYLLUM INOPHYLLUM L) Astam, Amal; Nurliana, Laily; Kadidae, La Ode
Hydrogen: Jurnal Kependidikan Kimia Vol 7, No 2 (2019): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v7i2.1927

Abstract

Research on the synthesis of methyl ester nitrate from nyamplung seed oil (Calophyllum inophyllum L.). The aims of study are to are to determine the nitrate methyl ester can be synthesized from nyamplung seed oil determine the yield of the transesterification and nitration reaction from nyamplung seed oil. In this study nyamplung seed oil was obtained from pressing nyamplung seeds using a hydraulic press, then the crude oil obtained was subsequently degumming to remove gum. Free oil of the etherified gum then transesterification with methanol. The transesterification results are then titrated and produce nitric methyl esters. Characterization of nitric methyl ester  by spectrophotometer IR shows functional groups C-ONO2, C=C dan C-NO2 at wave number 1635,64 cm-1 1550,77 cm-1 dan 1365, 60 cm-1. The yield of transesterification of nyamplung oil was 64.66% and the nitration yield was 10.6%.
KARAKTERISASI KARBON BAGGASE TERAKTIVASI DAN APLIKASINYA UNTUK ADSORPSI LOGAM TEMBAGA Indah, Dahlia Rosma; Safnowandi, Safnowandi
Hydrogen: Jurnal Kependidikan Kimia Vol 7, No 2 (2019): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v7i2.1912

Abstract

Bagasse is waste produced from the process of milking or extracting sugarcane stems. Baggase can be optimized in terms of use value and its function as an alternative technology, namely as an active carbon manufacturing material that can be used as a copper (Cu) adsorbent. This study discusses the functional baggase activated carbon group of phosphoric acid and nitric acid using Fourier Transform Infra Red (FTIR) and its application as a copper metal adsorbent in silver craft waste in Ungga Village, Praya, Central Lombok. The production of activated bagasse carbon consists of three stages, namely first dehydration by burning bagasse until it turns into carbon, the second carbonation is heating at 500ºC, carbon results are 100-200 mesh and third, activation by soaking 50 grams of carbon in 500 mL of 20% phosphoric acid and 20% nitric acid for 12 hours. After that the carbon is dried at 110ºC and finally heated at 500ºC for 1 hour. The bagasse carbon that has been made is put into 25 mL of waste water sample with a mass of 2 grams of adsorbent. Samples were then stirred at 30, 60, 90, 120 and 150 minutes contact time variations at a speed of 180 rpm using a batch system. The optimum contact time that is used to calculate the efficiency of copper metal content reduction is by calculating the difference in the metal content of copper metal before it is adsorbed and after it is adsorbed using activated carbon baggase. Concentrations of all copper metals were analyzed using Atomic Absorption Spectrophotometer (AAS). Identification using FTIR spectrophotometer shows that carbon baggase in this study contains functional groups C = O, C = C, C-C, N = O, C = N, C-OH, CH2 and C-H. From the research it was found that the copper metal content in the sample was 14.5710 ppm. The optimum contact time on copper metal adsorption is at 120 minutes contact time which results in optimum adsorption efficiency on copper metal that is 84.88%. Activated carbon baggase is an effective adsorbent to reduce levels of copper metal in silver craft waste.
PREPARASI MATRIKS ALAM SEKRESI KUTU LAK DENGAN ASAM ADIPAT PADA BIOKOMPOSIT SERAT RAMI Prianto, Hestya Arinta Ayu; Ruspita, Roza; Rohaeti, Eli
Hydrogen: Jurnal Kependidikan Kimia Vol 7, No 2 (2019): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v7i2.1759

Abstract

In this research, preparation of natural matrix from modified flea secretion (SKL) by the addition of adipic acid as matrix in biocomposites of ramie fiber have been carried out. This research was initiated by dissolving the chunks of flea secretion using ethanol with ratio 1:2 and heated at temperature 50oC. Flea secretion has modified by the addition of adipic acid in various concentration 5%, 10%, 15%, 20%, and 25%. Viscometry technique with viscometer ostwald was used for characterizing intrinsic viscosityof natural matrix. The optimum value of intrinsic viscosity were reached at concentration 5% of adipic acid that has 77,08 mg/l viscosity. Biocomposites were made by mixing ramie fibers and natural matrix SKL which have been modified by the addition of adipic acid with optimum concentration at 60:40ratio of fibers: matrix. Biocomposites were evaluated for mechanical properties with ASTM D638 type IV standard. Biocomposite sampel was formed specimens and tested with tensile tester. Biocomposite from ramie fibers and natural matrix SKL modified by adipic acid has a tensile strength 15,14 MPa and elastic modulus was 1519,15 MPa.
DAMPAK PROCESS-ORIENTED GUIDED-INQUIRY LEARNING (POGIL) TERHADAP PENGETAHUAN METAKOGNITIF SISWA PADA TOPIK ASAM-BASA Ardhana, Ivan Ashif
Hydrogen: Jurnal Kependidikan Kimia Vol 8, No 1 (2020): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

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Abstract

Aim of this research is to investigate different impact of Process-Oriented Guided-Inquiry Learning (POGIL) and verification as learning approach at senior high school students? metacognitive knowledge grade XI program IPA on acid-base topic. Research design used was quasi experimental. Hypothesis testing uses t-test with 5% (0,05) significance utilizing SPSS 21 application. Results show that (1) there is significance difference of students? metacognitive knowledge that is taught by POGIL approach and verification, and (2) students that are taught by POGIL approach give better answer?s pattern of declarative, procedural, and conditional knowledge than students that are taught by verification approach.
KARAKTERISASI BIOPLASTIK DARI PEKTIN KULIT LABU KUNING (CUCURBITA MOSCHATA DURCH) Listyarini, Risnita Vicky; Susilawati, Puspita Ratna; Cahyaningrum, Rosalia; Tonapa, Nely
Hydrogen: Jurnal Kependidikan Kimia Vol 8, No 1 (2020): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

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Abstract

Pumpkin (Cucurbita moschata Durch) is one of the vegetable plants that are generally consumed as food. Pumpkin skin is a waste that has potential as a raw material for making bioplastics because it has pectin content. The characteristics of pectin that are gel become a reference in making bioplastics. Bioplastic synthesis consists of four steps, namely the making of pumpkin peel flour, pectin extraction, bioplastic synthesis, and bioplastic characterization. The experimental results show that pumpkin skin waste can be extracted with HCl solution and produce pectin in a ratio of0.1:10 grams (w/w). The results of FTIR spectra characterization showed that bioplastics included pectin which produced absorption of C = O carbonyl groups in 1645 - 1625 cm-1 and C-O stretch groups at 1101 - 1104 cm-1. Bioplastics produced have yellow characteristic. Pumpkin skin waste bioplastics are expected to be an alternative solution to the utilization of waste into products.
EFEKTIVITAS POGIL PADA PEMBELAJARAN KESETIMBANGAN KIMIA TERHADAP KETERAMPILAN PROSES SAINS DAN HASIL BELAJAR SISWA DENGAN KEMAMPUAN AWAL BERBEDA Mu'minin, Ali Amirul; Dasna, I Wayan; Suharti, Suharti
Hydrogen: Jurnal Kependidikan Kimia Vol 8, No 1 (2020): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

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Abstract

Studying hydrocarbon material requires ability in problem solving so students are able to identify, analyze, and describe abstract chemical concepts and principles into concrete. The purpose of this study was to the improving of students' hydrocarbon problem solving abilities through the SAVI learning model assisted by puzzle media. The research design used in this study was pre-experimental with a research design namely One Group Pretest-Posttest Design.The study was conducted at SMAN 7 Mataram, Jl. Adi Sucipto, Ampenan Utara, Kec. Ampenan, Mataram City, West Nusa Tenggara. The subjects of this study were students of class XI Science. The research instrument include syllabus, lesson plans, worksheets, and multiple choice test items. Data were analyzed using the N-Gain test to find out the increased ability to solve hydrocarbon problems. The results showed that the level of N-Gain was in the range of 0.33 with a moderate category which meant an increase in students' problem solving abilities after using the SAVI model assisted by puzzle media. Thus, it can be concluded that students' problem solving abilities can be improved through the application of SAVI learning models assisted by puzzle media.
PENINGKATAN KEMAMPUAN PEMECAHAN MASALAH HIDROKARBON SISWA MELALUI MODEL SAVI DISERTAI MEDIA PUZZLE Dewi, Citra Ayu; Pahriah, Pahriah; Gazali, Zulkarnain
Hydrogen: Jurnal Kependidikan Kimia Vol 8, No 1 (2020): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Studying hydrocarbon material requires ability in problem solving so students are able to identify, analyze, and describe abstract chemical concepts and principles into concrete. The purpose of this study was to the improving of students' hydrocarbon problem solving abilities through the SAVI learning model assisted by puzzle media. The research design used in this study was pre-experimental with a research design namely One Group Pretest-Posttest Design.The study was conducted at SMAN 7 Mataram, Jl. Adi Sucipto, Ampenan Utara, Kec. Ampenan, Mataram City, West Nusa Tenggara. The subjects of this study were students of class XI Science. The research instrument include syllabus, lesson plans, worksheets, and multiple choice test items. Data were analyzed using the N-Gain test to find out the increased ability to solve hydrocarbon problems. The results showed that the level of N-Gain was in the range of 0.33 with a moderate category which meant an increase in students' problem solving abilities after using the SAVI model assisted by puzzle media. Thus, it can be concluded that students' problem solving abilities can be improved through the application of SAVI learning models assisted by puzzle media.
PEMISAHAN PERAK DARI LIMBAH FOTORONTGEN DENGAN TEKNIK MEMBRAN CAIR BERPENDUKUNG MENGGUNAKAN PENGEMBAN GABUNGAN TBP DAN D2EHPA Kurniasih, Yeti; Ahmadi, Ahmadi; Nufida, Baiq Asma
Hydrogen: Jurnal Kependidikan Kimia Vol 8, No 1 (2020): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

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Abstract

The photorontgen process produces waste that is harmful to the environment because it contains silver ions that are toxic to living organisms. The silver content in photorontgent waste is 2000 mg / L, while the permissible threshold value for silver in aquatic is 0.1 - 1.0 mg / L, so the disposal of photorontgent waste into the waters will be dangerous. However, silver metal has high economic value so that silver metal separation from x-ray waste is required, in addition to reducing the environmental burden due to silver metal pollution, it is also expected to reuse the silver metal economically. The technique of separation that can be used is a supported liquid membrane (Supported Liquid Membrane, SLM). This technique has the advantage that its separation process is relatively easy because the extraction and stripping process takes place in one stage, the carrying solution as extractant is more stable in the supporting membrane and the amount of extractant required is small. This research studies the effect of waste dilution factors on the effieciency separation of silver from photorontgen waste. Separation was carried out at the optimum SLM condition by using combined carrier compound TBP and D2EHPA with a ratio of 0.25: 0.75, total concentration of 1 M in kerosene and 0.1 M HNO3 as stripping phase. Sample waste was diluted by a factor dilution 25, 50, 75 and 100 times. Measurement of metal content before and after separation is done with AAS. The results showed that the waste dilution factor influenced the efficiency of silver trasnpor through SLM. Percent of silver separation was obtained 21.33% in waste with 100 times dilution.

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