EduChemia Pub Date : 2020-07-30 DOI: 10.30870/educhemia.v5i2.7508

Ifah Silfianah

{"title":"Development of Multiple Representation-Based General Chemistry Textbook Using Guided Inquiry","authors":"Ifah Silfianah","doi":"10.30870/educhemia.v5i2.7508","DOIUrl":"https://doi.org/10.30870/educhemia.v5i2.7508","url":null,"abstract":"This study aims to describe the development process and determine the feasibility of multiple representation-based textbooks that are designed with a guided inquiry model. The method used in this research is the Research & Development (R&D) with the ADDIE (Analyze, Design, Develop, Implementation, Evaluate) model. Analyze stages are carried out in the form of curriculum analysis, concepts, and learning resources. In the design process, textbooks are made following the guided inquiry learning stages and design the media in the form of images that show multiple representations so that an initial draft is produced. At the Develop stage, draft books are printed and reproduced for validation and revision. The next step of implementation is carried out through a small-scale trial to determine the initial response to the textbook. In the final stage (Evaluation), the textbook on the results of the small-scale trial was revised to be used in the medium-scale trial to get the textbook's final response data. This study involved ten students in the chemical Tadris department in the small group and 29 students in the moderate group. The instrument used was the validation sheet and the language response sheet and the presentation of the textbook. Data of expert validation and trial results were analyzed descriptively and qualitatively in the form of percentages using a Likert scale. The results showed the feasibility of the content, linguistic, presentation, and graphic textbooks, respectively 95.33%, 94.76%, 92.16%, and 92.58%. The suitability of the textbooks with the guided inquiry syntax and multiple presentations was 98.33% each. A small group trial shows that the language aspect gets 84.33 scores, and the presentation aspect is 84.75. After the textbook was revised, the trial results for the medium group showed that the linguistic aspect value was 90.34, and the presentation aspect was 92.59. Overall it can be concluded that the textbooks developed are very suitable for use in learning.","PeriodicalId":55717,"journal":{"name":"EduChemia","volume":"5 1","pages":"180-196"},"PeriodicalIF":0.0,"publicationDate":"2020-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44123817","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: 3

Enhancement of Interpretation and Inference Skills Through Guided Inquiry in Chemical Equilibrium 通过化学平衡中的引导性探究提高解释和推理能力

EduChemia Pub Date : 2020-07-30 DOI: 10.30870/educhemia.v5i2.7273

Fajar Pambudi, D. Novita

{"title":"Enhancement of Interpretation and Inference Skills Through Guided Inquiry in Chemical Equilibrium","authors":"Fajar Pambudi, D. Novita","doi":"10.30870/educhemia.v5i2.7273","DOIUrl":"https://doi.org/10.30870/educhemia.v5i2.7273","url":null,"abstract":"This research aims to know the improvement of students' interpretation and inference skills, which are drilled through a guided inquiry learning model on chemical equilibrium material at SMAN 1 Driyorejo. This research used one group pretest and posttest design with a sample of 35 students in class XI SMAN 1 Driyorejo Kabupaten Gresik. The research procedure consisted of 3 stages, namely the preparation stage in the form of pre-research data collection, the stage of carrying out data collection, and the final stage in the form of data analysis. The research instrument consisted of an observation sheet on the implementation of learning, an observation sheet of students' activity, and the question sheet of interpretation and inference skills test. Data collection methods consist of observing the implementation of learning, students' activities, and interpretation and inference skills tests. It can be concluded in this study that (1) the implementation of learning at the first meeting, the second meeting and the third meeting in the range of 85% - 92% with good criteria, (2) student activities during learning get results at the first meeting until the third meeting that is above 90% so that student activities support learning to practice students 'interpretation and inference skills (3) Students' interpretation and inference skills in the teaching and learning process have increased from pretest and posttest with N-gain values in the medium and high criteria.","PeriodicalId":55717,"journal":{"name":"EduChemia","volume":"5 1","pages":"153"},"PeriodicalIF":0.0,"publicationDate":"2020-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43620042","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

Antioxidant Activity of Mixed Katuk Leaf Extract and Honey Katuk叶提取物和蜂蜜的抗氧化活性

EduChemia Pub Date : 2020-07-30 DOI: 10.30870/educhemia.v5i2.7275

A. Fathoni, La Ode Sumarlin, J. Putri, Narti Fitriana

{"title":"Antioxidant Activity of Mixed Katuk Leaf Extract and Honey","authors":"A. Fathoni, La Ode Sumarlin, J. Putri, Narti Fitriana","doi":"10.30870/educhemia.v5i2.7275","DOIUrl":"https://doi.org/10.30870/educhemia.v5i2.7275","url":null,"abstract":"Antioxidants can be obtained from plants or animals. One of the plants that can be used as a source of antioxidants is katuk leaf (Sauropus androgynus (L.) Merr.) and honey. The content of compounds in both materials that function as antioxidants are phenolic, flavonoids, and vitamin C. This study aims to analyze the levels of total phenolic, flavonoids, vitamin C, antioxidant activity, the effect of different compositions on combination treatments, and analyze the relationship between phenolic levels and vitamin C with antioxidant activity from the test sample. This study used an experimental method with a completely randomized design. Antioxidant activity was tested using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) method. The results showed phenolic levels of all test samples ranged from 0.509-23.205 mg GAE/g samples; flavonoids amounted to 0.027-17.329 mg QE/g samples, vitamin C amounted to 15,917-101,705 mg AA/g samples and IC50 of 114.213-20727.500 mg/l. The combination treatment with more katuk leaf composition can increase the levels of compounds and antioxidant activity. Phenolic levels and vitamin C have a moderate relationship with antioxidant activity with the correlation coefficient values of -0.480 and -0.500.","PeriodicalId":55717,"journal":{"name":"EduChemia","volume":"5 1","pages":"168-179"},"PeriodicalIF":0.0,"publicationDate":"2020-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47095617","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: 3

Designing Learning Sequence Metalic Bonding Concept Through Model of Educational Reconstruction Framework 通过教育重构框架模型设计学习序列金属键合概念

EduChemia Pub Date : 2020-07-30 DOI: 10.30870/educhemia.v5i2.8423

Euis Nursaadah, L. Liliasari, A. Mudzakir

{"title":"Designing Learning Sequence Metalic Bonding Concept Through Model of Educational Reconstruction Framework","authors":"Euis Nursaadah, L. Liliasari, A. Mudzakir","doi":"10.30870/educhemia.v5i2.8423","DOIUrl":"https://doi.org/10.30870/educhemia.v5i2.8423","url":null,"abstract":"The problem in this research is that students are more familiar with the application of metallic bonding than its concept. This is because the characteristics of the concept are abstract concepts with real context. It makes students more interested in studying the phenomenon but lack to explain the concept and some students show misconception. Therefore this research aims to design learning sequences of metallic bonding topics using the framework model of educational reconstruction (MER). This sequence considers the students’ and scientists’ conception. Considering the initial conception of students in designing learning sequences provides benefits for students. Through MER, learning sequences begin by analyzing student conceptions through semi-structured interviews and concept maps designed by students. Scientific conception analysis is done through concept analysis of several text books that are often used in learning. There are three criteria of students’ conception they are prefer to scientist conception, misconception, and incompetence. Based on the three criteria, learning sequences are produced with the aim to bringing students' conceptions toward scientific conceptions.","PeriodicalId":55717,"journal":{"name":"EduChemia","volume":"5 1","pages":"101-110"},"PeriodicalIF":0.0,"publicationDate":"2020-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43003143","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

Development of Chemical Practicum Guide Oriented Chemoentrepreneurship in Colloid Synthesis

EduChemia Pub Date : 2020-07-30 DOI: 10.30870/educhemia.v5i2.7247

I. Wijayanti, R. Rahayu, Solfarina Solfarina

引用次数: 0

Analysis of Students Misconception Using Certainly of Response Index (CRI) in the Periodic System of Elements Concept 用元素周期系统概念中的反应肯定指数分析学生的错误认识

EduChemia Pub Date : 2020-07-30 DOI: 10.30870/educhemia.v5i2.8285

Yusran Ramadhan, K. Nisa, Sunarwin Sunarwin

引用次数: 4

Synthesis, Characterization and Antioxidant Activity of Kobalt (II)-Hydrazone Complex Kobalt（II）-腙配合物的合成、表征及抗氧化活性

EduChemia Pub Date : 2020-07-30 DOI: 10.30870/educhemia.v5i2.7987

Yulyani Nur Azizah, I. Mulyani, D. Wahyuningrum, Damar Nurwahyu Bima

{"title":"Synthesis, Characterization and Antioxidant Activity of Kobalt (II)-Hydrazone Complex","authors":"Yulyani Nur Azizah, I. Mulyani, D. Wahyuningrum, Damar Nurwahyu Bima","doi":"10.30870/educhemia.v5i2.7987","DOIUrl":"https://doi.org/10.30870/educhemia.v5i2.7987","url":null,"abstract":"The potency of the first-row transition metal complexes with Schiff's base ligand as an antioxidant has been widely studied by researchers. In this study, hydrazone-type Schiff base compounds, salicylaldehyde-2,4-dinitrophenylhydrazone (SDPH), resulted from the condensation of salicylaldehyde (1.5 mmol) and 2,4-dinitrophenylhydrazine (1.5 mmol) were synthesized and characterized with 1H-NMR. The synthesized SDPH was used as ligands in the formation of Co(II) metal complexes. The Co(II)-SDPH complexes were synthesized with reflux reaction at 60 o C for 6 hours in molar ratio 1:3. Triethylamine is used to synthesis Co(II)-SDPH, which serves to deprotonate SDPH ligands. ESI-MS analysis showed that the complex is a neutral dimeric complex.The complex has the chemical formula [Co2(SDPH)2[(Et)3N]2(acn)2(OH)2} ([M+Na]+ = 1061 g/ mol), shown on the ESI-MS spectrum. Coordinate bonds between Co (II) metal ions with ligands are observed in the presence of shifting of the C=N wave number, as well as the loss of the vibrating peaks of the O-H groups to the infrared spectra of complexes. The IR spectrum of complexes was suggested that SDPH behave as a bidentate ligand through the azomethine nitrogen atom and phenolic oxygen atom. The ligand and its Co(II) complex have been screened for antioxidant activity against DPPH (2,2-diphenyl-1-picrylhydrazine). Based on the activity test results, the IC50 value of Co(II)-SDPH complex was lower than ligand. These results show that Co(II)-SDPH are potentials as antioxidants .","PeriodicalId":55717,"journal":{"name":"EduChemia","volume":"5 1","pages":"119-133"},"PeriodicalIF":0.0,"publicationDate":"2020-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49553516","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: 3

Utilization of Nata De Coco as Adsorben in Methyl Orange Adsorption 椰果在甲基橙吸附中的应用

EduChemia Pub Date : 2020-07-30 DOI: 10.30870/educhemia.v5i2.7977

Sani Widyastuti Pratiwi, Siska Novita Sari, Ratna Nurmalasari, Meli Indriani

引用次数: 2

Antileukemic Activity of Methanol Extract From Stem of Baccaurea macrocarpa, Syzygium jambos, Bouea macrophylla Griff., and Diospyros discolor Willd 大竹节、大竹节、大竹节茎甲醇提取物的抗白血病活性。和Diospyros使wild变色

EduChemia Pub Date : 2020-07-30 DOI: 10.30870/educhemia.v5i2.8320

Antoni Pardede, Rr. Christanti Kusuma Wardhani, Emilda Frasisca

{"title":"Antileukemic Activity of Methanol Extract From Stem of Baccaurea macrocarpa, Syzygium jambos, Bouea macrophylla Griff., and Diospyros discolor Willd","authors":"Antoni Pardede, Rr. Christanti Kusuma Wardhani, Emilda Frasisca","doi":"10.30870/educhemia.v5i2.8320","DOIUrl":"https://doi.org/10.30870/educhemia.v5i2.8320","url":null,"abstract":"A secondary metabolite is a compound produced by plants that are needed for its survival. Those compounds are used as attractant, repellant, and protectant. The three of them, such as color, taste, aroma, and thorns of the plants. These secondary metabolite compounds are important to be revealed. It aims to find new natural resources that are safer, more effective, and efficient in aiding the health sector, such as anticancer, antibacterial, and hepatoprotective and antioxidant properties. The research trends of natural products chemistry sourced from plants that are widely developing are extraction and biological activity, such as anticancer. In this research, the extraction of 1 kg sample was done by using maceration method and produced methanol extract of kapul (Baccaurea macrocarpa) 3.1%, jambu mawar (Syzygium jambos) 2.4%, ramania (Bouea macrophylla Griff) 9% and mentega (Diospyros discolor Willd) 2.7%, and the result of antileukemic activity of methanol extract sample (the survived HL-60 cell percentage) sequentially were 22.6%, 12.7%, 44.1% and 37.3% with the concentration of 100 µg/mL. Jambu mawar (Syzygium jambos) exhibited the highest antileukemic activity with the survived cell percentage (HL-60 cells) of 12.7% among the methanol extract of samples tested .","PeriodicalId":55717,"journal":{"name":"EduChemia","volume":"5 1","pages":"111-118"},"PeriodicalIF":0.0,"publicationDate":"2020-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45284181","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: 2

Antibacterial Activity of Brown Macroalgae Lipid (Sargassum duplicatum) to The Methicillin Resistant Staphylococcus aureus (MRSA) And Shigella dysentriae Bacteria 褐藻脂质（马尾藻）对耐甲氧西林金黄色葡萄球菌和志贺菌的抗菌活性

EduChemia Pub Date : 2020-04-05 DOI: 10.30870/EDUCHEMIA.V5I1.6432

Riong seulina Panjaitan, Ani Rombe Sarungngu, Lika Lastri Sitorus

{"title":"Antibacterial Activity of Brown Macroalgae Lipid (Sargassum duplicatum) to The Methicillin Resistant Staphylococcus aureus (MRSA) And Shigella dysentriae Bacteria","authors":"Riong seulina Panjaitan, Ani Rombe Sarungngu, Lika Lastri Sitorus","doi":"10.30870/EDUCHEMIA.V5I1.6432","DOIUrl":"https://doi.org/10.30870/EDUCHEMIA.V5I1.6432","url":null,"abstract":"Methicillin Resistant Staphylococcus aureus (MRSA) is the main cause of nosocomial infections in burn patients due to the occurrence of antibiotic resistance. Dysentery or shigellosis is an infection that causes sores (ulcers) in the large intestine in the middle caused by the bacteria Shigella dysentriae . Some studies show that Sargassum duplicatum has antibacterial abilities. This study aim s to determine the antibacterial activity of Sargassum duplicatum seaweed lipid extract to the bacteria Methicillin Resistant Staphylococcus aureus (MRSA) and Shigella dysentriae bacteria. The method used in this study was the Folch method (using sochletation with a solvent ratio of chloroform:methanol (2:1)) to extract lipids from Sargassum duplicatum . Then using the paper disc diffusion method with positive control of tetracycline. From the extraction results obtained , the lipid levels of Sargassum duplicatum , where the chloroform phase was 0.493% (b / b) and the methanol phase was 2.40% (b / b). The results of the lipid antibacterial activity of Sargassum duplicatum at the pure concentration in the methanol phase with an average concentration of 7.07 mm on the Methicillin Resistant Staphylococcus aureus (MRSA) Bacteria while in the S h igella dysentriae bacteria obtained an average of 7.05 mm and the chloroform phase obtained an average diameter of 9.16 mm on Methicillin Resistant Staphylococcus aureus (MRSA) and in Shigella dysentriae Bacteria an average of 3.99 mm while tetracycline antibiotics amounted to 11.67 mm on Methicillin Resistant Staphylococcus aureus (MRSA) and 18.98 mm in Shigella dysentriae bacteria.","PeriodicalId":55717,"journal":{"name":"EduChemia","volume":"5 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2020-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44653867","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

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