Hydrogen: Jurnal Kependidikan Kimia最新文献_第4页

Kapasitas Total Antioksidan Ekstrak Metanol Biji Kakao (Theobroma cacao. L) Dengan Metode Spektrofotometri Uv-Vis 可可可可豆的总抗氧化物提取物(可可可种子碱)容量。L) Uv-Vis光谱测量方法

Hydrogen: Jurnal Kependidikan Kimia Pub Date : 2021-06-08 DOI: 10.33394/HJKK.V9I1.3794

Agung Ari Chandra Wibawa

{"title":"Kapasitas Total Antioksidan Ekstrak Metanol Biji Kakao (Theobroma cacao. L) Dengan Metode Spektrofotometri Uv-Vis","authors":"Agung Ari Chandra Wibawa","doi":"10.33394/HJKK.V9I1.3794","DOIUrl":"https://doi.org/10.33394/HJKK.V9I1.3794","url":null,"abstract":"Antioxidant compounds is one of compounds are needed by the body to reduce free radicals. The ability of antioxidants to reduce free radicals is called antioxidant capacity. The purpose of this study was to provide information on the total antioxidant capacity of the methanol extract of cocoa beans with the DPPH (2,2-Diphenyl-1-Picrylhydrazyl) method using spectrophotometer uv-vis. The crude extract obtained was extracted using methanol solvent by maceration method. The results of the phytochemical screening test on the methanol extract of cocoa beans showed the presence of flavonoids and tannins. The total antioxidant capacity test of cocoa bean extract used the standard equivalent value of gallic acid which has been shown to have a strong antioxidant ability to reduce DPPH free radicals at a wavelength of 517 nm. The results of the measurement of total antioxidant capacity in the variation of treatment, namely sun-dried cocoa beans and oven cocoa beans were 27.730 and 42.454 mg/mL GAEAC. Based on the results of this study, it was found that the ethanol extract of oven cocoa beans had the greatest total antioxidant capacity, namely 42.454 mg/mL GAEAC.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134249714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analisis Kualitas Butir Soal Buatan Guru Kimia Pada Tes Ujian Tengah Semester Ganjil Kelas XII MIPA 化学老师在十二米帕期中考试奇形怪状的试卷质量分析

Hydrogen: Jurnal Kependidikan Kimia Pub Date : 2021-06-08 DOI: 10.33394/HJKK.V9I1.3701

H. Simamora, H. Hartono, Effendi Effendi

{"title":"Analisis Kualitas Butir Soal Buatan Guru Kimia Pada Tes Ujian Tengah Semester Ganjil Kelas XII MIPA","authors":"H. Simamora, H. Hartono, Effendi Effendi","doi":"10.33394/HJKK.V9I1.3701","DOIUrl":"https://doi.org/10.33394/HJKK.V9I1.3701","url":null,"abstract":"This researchi is want to knowithe test quality of items in the mid semester for XII Grade of SMA Negeri 1 PematangsiantarIin academic yearI 2020/2021 basic on terms of reliability test, validity, difficulty index, descriminationi index and disctractor. The research have used thecollecting data’s method was documentation and to collect some of test item, student answer sheet, answer key and so do interview to chemistry teachers in this school. Research used subject in this school were grade XII Science 1,2,and 3 of the science students of SMA Negeri 1 Pematangsiantar with total of subject 108 students based on purposive sanpling that researcher which has been used. The research have used method ofIanalyzed was quantitative descriptiveIconducted and it has used softwere program based of SPSSIversion 25 and Anates version 4.0.9. The result of the research concluded that the quality of the test item has some of category such as showed 2 items (10%) had very good quality and 2 items (10%)too had poorIquality of test and extremely poor quality in same test and should be suggest to thrown awayand 8 items (40%) known that has good quality, 4 (20%) has moderately quality, 3 (15%) has poor quality of item test and conclude that the quality of item test had moderately good quality based on this research.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130380603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pengembangan E-Modul Berbasis Pemecahan Masalah Pada Materi Larutan Elektrolit dan Non-Elektrolit (ELNOEL) e模块以解决问题为基础的电解质和非电解质溶液材料(ELNOEL)

Hydrogen: Jurnal Kependidikan Kimia Pub Date : 2021-06-08 DOI: 10.33394/HJKK.V9I1.3715

Ratna Sari Siti Aisyah, Solfarina Solfarina, Unita Yuliantika

{"title":"Pengembangan E-Modul Berbasis Pemecahan Masalah Pada Materi Larutan Elektrolit dan Non-Elektrolit (ELNOEL)","authors":"Ratna Sari Siti Aisyah, Solfarina Solfarina, Unita Yuliantika","doi":"10.33394/HJKK.V9I1.3715","DOIUrl":"https://doi.org/10.33394/HJKK.V9I1.3715","url":null,"abstract":"High school students have difficulty in understanding “electrolyte and non-electrolyte” solution materials because they are mostly abstract. Students should study three aspects in electrolyte and non-electrolyte solutions including macroscopic, symbolic and submicroscopic. However, the fact that in school only accentuates macroscopic and symbolic levels. Then the learning resources cannot provide an explanation of the submicroscopic level and the learning model used does not make students active in accordance with the 2013 curriculum. This study aims to produce products in the form of problem solving-based Elnoel E-modules on electrolyte and non-electrolyte solution materials, as well as explaining the feasibility of E-elnoel module and student response to Elnoel E-module. This research is designed with ADDIE model with analyze, design, development, implementation and evaluation stages. This Elnoel e-module is validated by 7 experts (judment) that the results of material validation and media validation are declared valid with a value of 0.85 and 0.81. Then the Elnoel E-module was implemented to 9 students of grade XI science at Al-Qudwah Integrated High School to find out the student's response to the media developed by obtaining a percentage of 89% that belongs to the category very good.It can be seen that the development of media arranged based on problem solving can stimulate students’ thinking skills and get a positive response from students.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129190641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Pengembangan Media Pembelajaran Berbasis Android Untuk Memfasilitasi Kebutuhan Pembelajaran Multiple Representation 以Android为基础的学习媒体开发，以促进多代学习的需求

Hydrogen: Jurnal Kependidikan Kimia Pub Date : 2021-06-08 DOI: 10.33394/HJKK.V9I1.3801

N. Setiawan, Oktavia Sulistina, Habiddin Habiddin, Rucira Pavita

{"title":"Pengembangan Media Pembelajaran Berbasis Android Untuk Memfasilitasi Kebutuhan Pembelajaran Multiple Representation","authors":"N. Setiawan, Oktavia Sulistina, Habiddin Habiddin, Rucira Pavita","doi":"10.33394/HJKK.V9I1.3801","DOIUrl":"https://doi.org/10.33394/HJKK.V9I1.3801","url":null,"abstract":"During the Covid-19 pandemic, learning is done online. Many students experience difficulties and decreased learning achievement while carrying out online learning. The reaction rate practicum learning media used at the high school level does not yet represent macroscopic, submicroscopic, and symbolic chemical concepts and has not been adapted to online learning. Multiple chemical representations can be applied using android-based learning media so that students are expected to understand the concepts in the reaction rate practicum. Android-based learning media is used to support the learning process. The purpose of developing android-based learning media on the reaction rate practicum concept is to produce android-based learning media and determine its feasibility. The development model used is the 4-D model by Thiagarajan, et al. The product developed in the form of an android-based reaction rate practicum learning media for students at senior high school. Based on the validation results indicate that the module is very feasible to use by meeting the percentage of 88.8%. The results of the readability test on the module obtained a percentage of 84.5%, so based on this assessment the module is very suitable for students to use as a learning resource and learning process in the classroom.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126154812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Identifikasi Senyawa Penyusun Produk Cair Hasil Pirolisis Aspal Alam dari Lawele Kabupaten Buton

Hydrogen: Jurnal Kependidikan Kimia Pub Date : 2021-06-08 DOI: 10.33394/HJKK.V9I1.3568

Rustam Musta, Muh. Siddik Ibrahim, Laily Nurliana

引用次数: 0

Identifikasi Miskonsepsi Mahasiswa Pada Pembelajaran Daring Matematika Kimia Melalui Tes Diagnostik Three Tier Multiple Choice 通过三层多选择诊断测试，确定学生在在线化学数学学习中的不足

Hydrogen: Jurnal Kependidikan Kimia Pub Date : 2020-12-31 DOI: 10.33394/hjkk.v9i2.4422

Rina Elvia, Salastri Rohiat, S. Ginting

{"title":"Identifikasi Miskonsepsi Mahasiswa Pada Pembelajaran Daring Matematika Kimia Melalui Tes Diagnostik Three Tier Multiple Choice","authors":"Rina Elvia, Salastri Rohiat, S. Ginting","doi":"10.33394/hjkk.v9i2.4422","DOIUrl":"https://doi.org/10.33394/hjkk.v9i2.4422","url":null,"abstract":"The aim of this study is to determine the misconceptions of Chemistry Mathematics course participants during online learning in Chemistry Education Study Program, University of Bengkulu in the 2020/2021 academic year. This research starts with an online learning process for 4 meeting using Zoom meeting application and Google Classroom using synchronous and asynchronous methods. The method used to detect misconceptions is to provide a Three tier multiple choice diagnostic test consisting of multiple choice question, clear reasons in the form of an essay, and the level of confidence in answering and giving reasons. The tool used in this research is attest tool in the form of a diagnostic test and non-test tool in the form of an interview. Data collection techniques were conducted through test sheets in the form of a Google Forms application and short interviews about diagnostic tests in the form of videos. Data analysis was conducted on response options, reasons, and confidence in responding. The results showed that online learning had an impact on the misconceptions about Chemistry Mathematics course participants with a range of 0-50% where the highest misconception identification results were found in the application of inverse trigonometric functions by 50%,while 0% misconceptions were obtained in the basic concepts of algebraic functions and conversion of rational equations into a partial fractions.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124622143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Pemanfaatan Potensi Lokal Jombang Berupa Bunga Pacar Air Sebagai Indikator Alami 水生女友花的局部潜力利用作为自然指标

Hydrogen: Jurnal Kependidikan Kimia Pub Date : 2020-12-11 DOI: 10.33394/hjkk.v8i2.3124

Andri Wahyu Wijayadi, Lina Arifah Fitriyah, Nur Hayati

引用次数: 0

Pengembangan Digital Flipbook untuk Menfasilitasi Kebutuhan Belajar Multiple Representation pada Materi Sel Volta 数字Flipbook开发，促进Volta细胞物质的多功能学习需求

Hydrogen: Jurnal Kependidikan Kimia Pub Date : 2020-12-11 DOI: 10.33394/hjkk.v8i2.3194

N. Setiawan, I. W. Dasna, M. Muchson

{"title":"Pengembangan Digital Flipbook untuk Menfasilitasi Kebutuhan Belajar Multiple Representation pada Materi Sel Volta","authors":"N. Setiawan, I. W. Dasna, M. Muchson","doi":"10.33394/hjkk.v8i2.3194","DOIUrl":"https://doi.org/10.33394/hjkk.v8i2.3194","url":null,"abstract":"The voltaic cell teaching materials used in high school are still in the form of textbooks that do not present multiple representations of chemistry, namely the macroscopic, submicroscopic, and symbolic levels. The three levels of chemical representation can be visualized using flipbook teaching materials so that students are expected to understand the voltaic cell material. Teaching materials are used to support the learning process. Current learning still uses conventional learning models that only focus on teachers. Constructivist-based active learning is needed because it involves students so that learning is more meaningful. One of the constructivist learning models is the guided inquiry learning model which includes observing, asking questions, compiling hypotheses, gathering information, testing hypotheses, and concluding. The purpose.of this development.is to.produce a proper guided inquiry-based flipbook teaching material. The flipbook teaching.materials were developed.using the Four-D model (define, .design, .develop,and.disseminate) but the disseminated stage was not carried out. Media and material validation was carried out by five chemistry lecturers. The legibility test was carried out by 50 high school alumni with a specialization in Science. The assessment uses a Likert scale accompanied by comments, suggestions from the validator, and audience. The data obtained from the analysis questionnaire to determine the feasibility level of the product using the percentage technique. The validation of the flipbook teaching materials development product in terms of material obtained an average score of 85.4%, validation in terms of media.obtained.an.average percentage of 85.5%, while the readability test results obtained.an.average.percentage of 87%. Based on the results.of material validation, media, and legibility tests, it can be concluded that the flipbook teaching materials guided inquiry-based voltaic cells are very suitable as a learning resource.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"394 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126747634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Karakterisasi Bioplastik dari Pektin Kulit Labu Kuning (Cucurbita moschata Durch) 黄色南瓜皮Pektin的生物塑料特性(cucurita moschata Durch)

Hydrogen: Jurnal Kependidikan Kimia Pub Date : 2020-06-17 DOI: 10.33394/hjkk.v8i1.2559

Risnita Vicky Listyarini, Puspita Ratna Susilawati, R. Cahyaningrum, Nely Tonapa

引用次数: 0

Pemisahan Perak dari Limbah Fotorontgen dengan Teknik Membran Cair Berpendukung Menggunakan Pengemban Gabungan TBP dan D2EHPA 银与Fotorontgen废物的分离与液体膜支持技术使用TBP和D2EHPA复合光圈

Hydrogen: Jurnal Kependidikan Kimia Pub Date : 2020-06-17 DOI: 10.33394/hjkk.v8i1.2582

Yeti Kurniasih, Ahmadi Ahmadi, Baiq Asma Nufida

{"title":"Pemisahan Perak dari Limbah Fotorontgen dengan Teknik Membran Cair Berpendukung Menggunakan Pengemban Gabungan TBP dan D2EHPA","authors":"Yeti Kurniasih, Ahmadi Ahmadi, Baiq Asma Nufida","doi":"10.33394/hjkk.v8i1.2582","DOIUrl":"https://doi.org/10.33394/hjkk.v8i1.2582","url":null,"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.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122241712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1