Pub Date : 2021-12-08DOI: 10.24114/jpkim.v13i3.29930
A. Agustiningsih, N. Ngatijo, Muhammad Haris Effendi-hasibuan
The FBAL learning model is a learning model that has a specific purpose to improve students’ argumentation skills by integrating Toulmin's argumentation pattern. This study aimed to see the effectiveness of the Modified Flip-Based Argumentation Learning in improving students' argumentation skills about the concept of hydrocarbon compounds. The effectiveness was examined by comparing this model to Flip-Based Argumentation Learning and Flipped Classroom model. The factors that influence the differences in students’ argumentation skills amongst the three classes were also investigated. Concurrent embedded mix method design was used in this study. Some 93 students of 11 grade of SMA Negeri 1 Merangin Jambi were participated in this study. Data were collected using argumentation test (pre-test and post-test) and observations. The results showed that there was no difference between the Modified FBAL and FBAL in improving the students’ argumentation skills but both were different from the Flipped Classroom. The N-gain was 0.80 and 0.81 respectively for the Modified FBAL and FBAL. However, those were higher than the N-Gain of Flipped Classroom which was 0.71. Difference in providing the students with opportunities to practice their argumentation skills amongst the three models was the major factors influencing the students' argumentation skills in the three classes.
FBAL学习模式是一种通过整合Toulmin的论证模式，以提高学生论证能力为特定目的的学习模式。本研究旨在观察改进的翻转式论证学习在提高学生碳氢化合物概念的论证能力方面的效果。通过与翻转论证学习模式和翻转课堂模式的比较，检验了该模式的有效性。本研究亦探讨了影响三班学生辩论技巧差异的因素。本研究采用并行嵌入式混合法设计。本研究以SMA Negeri 1 Merangin Jambi 11年级93名学生为研究对象。采用论证法(前测法和后测法)和观察法收集数据。结果表明，修改后的FBAL和FBAL在提高学生的论证能力方面没有差异，但两者都与翻转课堂有所不同。改良FBAL和FBAL的n增益分别为0.80和0.81。然而，这些都高于翻转课堂的N-Gain(0.71)。三种模式在为学生提供练习议论文技巧的机会方面存在差异，是影响三班学生议论文技巧的主要因素。
{"title":"The effectiveness of modified flip-based argumentation learning in improving students’ argumentation skills about hydrocarbon","authors":"A. Agustiningsih, N. Ngatijo, Muhammad Haris Effendi-hasibuan","doi":"10.24114/jpkim.v13i3.29930","DOIUrl":"https://doi.org/10.24114/jpkim.v13i3.29930","url":null,"abstract":"The FBAL learning model is a learning model that has a specific purpose to improve students’ argumentation skills by integrating Toulmin's argumentation pattern. This study aimed to see the effectiveness of the Modified Flip-Based Argumentation Learning in improving students' argumentation skills about the concept of hydrocarbon compounds. The effectiveness was examined by comparing this model to Flip-Based Argumentation Learning and Flipped Classroom model. The factors that influence the differences in students’ argumentation skills amongst the three classes were also investigated. Concurrent embedded mix method design was used in this study. Some 93 students of 11 grade of SMA Negeri 1 Merangin Jambi were participated in this study. Data were collected using argumentation test (pre-test and post-test) and observations. The results showed that there was no difference between the Modified FBAL and FBAL in improving the students’ argumentation skills but both were different from the Flipped Classroom. The N-gain was 0.80 and 0.81 respectively for the Modified FBAL and FBAL. However, those were higher than the N-Gain of Flipped Classroom which was 0.71. Difference in providing the students with opportunities to practice their argumentation skills amongst the three models was the major factors influencing the students' argumentation skills in the three classes.","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87241710","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}
Pub Date : 2021-12-08DOI: 10.24114/jpkim.v13i3.29928
Ani Puspita Sari, Harizon Harizon, Muhammad Haris Effendi-hasibuan
Learning model that can train students in developing their argumentative skills includes the Argumentation Based Learning (ABL) and Problem Based Learning (PBL). This study aimed to see the effectiveness of the ABL and PBL models in improving students' argumentation skills about the concept of salt hydrolysis. The study was conducted in the class XI MIA SMAN 1 Tebo Jambi with a sample consisting of two classes. Some 50 students were recruited purposively to be the participants of this study. Concurrent embedded mix method using two group pretest posttest control group design was used in this study. The results of independent t-test showed that ABL was more effective than PBL (t= 4.864; p-value=0.00 < 0.05) in improving the students' argumentation skills. This was supported by the N-gain test of ABL which was 0.82 and the N -Gain test of PBL was 0.68. The results of observations revealed that the ABL students had more intensive opportunities to debate their argumentation than those in the PBL class. This was believed as the major factor influencing the difference in the students’ argumentation skills.
{"title":"The effectiveness of argumentation based learning and problem based learning models in improving student’s argumentation skills about salt hydrolysis concept","authors":"Ani Puspita Sari, Harizon Harizon, Muhammad Haris Effendi-hasibuan","doi":"10.24114/jpkim.v13i3.29928","DOIUrl":"https://doi.org/10.24114/jpkim.v13i3.29928","url":null,"abstract":"Learning model that can train students in developing their argumentative skills includes the Argumentation Based Learning (ABL) and Problem Based Learning (PBL). This study aimed to see the effectiveness of the ABL and PBL models in improving students' argumentation skills about the concept of salt hydrolysis. The study was conducted in the class XI MIA SMAN 1 Tebo Jambi with a sample consisting of two classes. Some 50 students were recruited purposively to be the participants of this study. Concurrent embedded mix method using two group pretest posttest control group design was used in this study. The results of independent t-test showed that ABL was more effective than PBL (t= 4.864; p-value=0.00 < 0.05) in improving the students' argumentation skills. This was supported by the N-gain test of ABL which was 0.82 and the N -Gain test of PBL was 0.68. The results of observations revealed that the ABL students had more intensive opportunities to debate their argumentation than those in the PBL class. This was believed as the major factor influencing the difference in the students’ argumentation skills.","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84618074","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}
Pub Date : 2021-12-01DOI: 10.24114/jpkim.v13i3.29017
Saud Salomo, Astri Devi Br Pakpahan, Dea Gracella Siagian, Grecy Kristina Tampubolon, Salsabila Afani, E. Eddiyanto, J. Sihombing
Plastic waste takes up to 450 years to decompose. These problems can be overcome by creating other alternatives, one of which is by using biodegradable plastic. Biodegradable plastics are plastics made from natural polymers that are easily degraded by microorganisms. This study aims to examine the effect of the amount of plasticizer on the length of the degradation process and the effect of using microwaves on the length of time for molding biodegradable plastic. This biodegradable plastic is made by combining durian seed starch, shrimp chitosan and plasticizers in the form of glycerol and polyglycerol with volume variations of 1 mL, 2 mL, 3 mL, 4 mL, and 5 mL. This polymerization was carried out using a microwave with a power of 100 watts for 60 minutes. The resulting biodegradable plastics were characterized using the FTIR test, the Mechanical Properties test, the Absorbency test, and the Biodegradation test to determine the quality of the biodegradable plastic. The results of this study indicate the greatest tensile strength value is 1.9768 MPa, the largest elongation value is 21.2772%, the smallest water absorption is 45.40% for 5 minutes, and the largest degraded mass is 0.908 grams for 7 days. Based on this research, it can be concluded that the use of polyglycerol can accelerate the plastic degradation process. In addition, the use of microwaves can speed up the molding time of biodegradable plastics.
{"title":"Biodegradable plastic modification from durian seed starch and shrimp chitosan with the addition of plasticiziers glycerol and polyglycerol using microwaves","authors":"Saud Salomo, Astri Devi Br Pakpahan, Dea Gracella Siagian, Grecy Kristina Tampubolon, Salsabila Afani, E. Eddiyanto, J. Sihombing","doi":"10.24114/jpkim.v13i3.29017","DOIUrl":"https://doi.org/10.24114/jpkim.v13i3.29017","url":null,"abstract":"Plastic waste takes up to 450 years to decompose. These problems can be overcome by creating other alternatives, one of which is by using biodegradable plastic. Biodegradable plastics are plastics made from natural polymers that are easily degraded by microorganisms. This study aims to examine the effect of the amount of plasticizer on the length of the degradation process and the effect of using microwaves on the length of time for molding biodegradable plastic. This biodegradable plastic is made by combining durian seed starch, shrimp chitosan and plasticizers in the form of glycerol and polyglycerol with volume variations of 1 mL, 2 mL, 3 mL, 4 mL, and 5 mL. This polymerization was carried out using a microwave with a power of 100 watts for 60 minutes. The resulting biodegradable plastics were characterized using the FTIR test, the Mechanical Properties test, the Absorbency test, and the Biodegradation test to determine the quality of the biodegradable plastic. The results of this study indicate the greatest tensile strength value is 1.9768 MPa, the largest elongation value is 21.2772%, the smallest water absorption is 45.40% for 5 minutes, and the largest degraded mass is 0.908 grams for 7 days. Based on this research, it can be concluded that the use of polyglycerol can accelerate the plastic degradation process. In addition, the use of microwaves can speed up the molding time of biodegradable plastics.","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75810451","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}
Pub Date : 2021-08-01DOI: 10.24114/jpkim.v13i2.26984
K. Gurning, Sifikal Lumbangaol, R. Situmorang, S. Silaban
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
{"title":"Determination of phenolic contents and antioxidant activity test of ethanol extract of Sirih merah (Piper crocatum Ruiz & Pav.) leaves using the DPPH method","authors":"K. Gurning, Sifikal Lumbangaol, R. Situmorang, S. Silaban","doi":"10.24114/jpkim.v13i2.26984","DOIUrl":"https://doi.org/10.24114/jpkim.v13i2.26984","url":null,"abstract":"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","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"68 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74680751","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}
Pub Date : 2021-08-01DOI: 10.24114/jpkim.v13i2.26981
L. Purba
This 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
本研究旨在确定使用Microsoft Teams 365进行在线学习的有效性。本研究采用整个人群作为研究样本，即雅加达印度尼西亚基督教大学化学教育研究项目的所有学生。感知数据采用问卷调查收集，问卷调查的维度包括对Microsoft Teams 365的材料、外观和可访问性的理解。从数据处理的结果来看，超过50%的学生对Microsoft Teams 365的看法在材料和外观的理解的所有指标上都是好的。在连通性和可访问性指标的使用维度上，超过50%的学生对微软365团队的看法是好的，但在配额节省指标上，42%的学生不同意。关键词:微软团队;E-learning
{"title":"Microsoft teams 365 and online learning: The student’s perception","authors":"L. Purba","doi":"10.24114/jpkim.v13i2.26981","DOIUrl":"https://doi.org/10.24114/jpkim.v13i2.26981","url":null,"abstract":"This 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","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76425581","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}
Pub Date : 2021-08-01DOI: 10.24114/jpkim.v13i2.26980
R. Safitri, H. Haryanto, Harizon Harizon
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
{"title":"Development of PBL-STEM-based E-LKPD to improve students' science literacy skills on reaction rate materials","authors":"R. Safitri, H. Haryanto, Harizon Harizon","doi":"10.24114/jpkim.v13i2.26980","DOIUrl":"https://doi.org/10.24114/jpkim.v13i2.26980","url":null,"abstract":"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","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"166 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75962678","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}
Pub Date : 2021-08-01DOI: 10.24114/jpkim.v13i2.26986
Dedi P Simatupang, Nora Susanti, J. Purba
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
{"title":"Stability of Styrax benzoin extract and fraction with the addition of glycerol and tween 80","authors":"Dedi P Simatupang, Nora Susanti, J. Purba","doi":"10.24114/jpkim.v13i2.26986","DOIUrl":"https://doi.org/10.24114/jpkim.v13i2.26986","url":null,"abstract":"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","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"112 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79721943","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}
Pub Date : 2021-08-01DOI: 10.24114/jpkim.v13i2.27028
Erdiana Gultom, Hestina Hestina, Nova Florentina, Barita Aritonang
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
{"title":"Paper making and characterization from waste coconut and tofu dregs","authors":"Erdiana Gultom, Hestina Hestina, Nova Florentina, Barita Aritonang","doi":"10.24114/jpkim.v13i2.27028","DOIUrl":"https://doi.org/10.24114/jpkim.v13i2.27028","url":null,"abstract":"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","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81025146","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}
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
Simargaolgaol (Aglaonema modestum Schott ex Engl)植物是一种野生植物，生长在北苏门答腊岛中央Tapanuli的Barus地区，被社区用作药用植物。摘要本研究旨在测定菝葜叶正己烷、乙酸乙酯和乙醇提取物对大肠杆菌和伤寒沙门氏菌的抑菌活性。采用圆盘扩散法对四马高尔高尔叶进行抑菌活性试验。抑菌活性结果表明，菝葜叶提取物的抑菌活性最高的是乙醇提取物(极性)、乙酸乙酯提取物(半极性)和正己烷提取物(非极性)。乙醇提取物、乙酸乙酯和正己烷对大肠杆菌的抑菌力为13.1 mm(强);9.7 mm(中);8.0 mm(中等)，伤寒沙门菌11.2 mm(强);10.7毫米(强)和9.3毫米(中)。提取液在直径中的浓度为10%。综上所述，司马高尔酚叶提取物具有一定的抗菌潜力。关键词:青霉，抑菌活性，大肠杆菌，伤寒沙门氏菌
{"title":"Antibacterial activity test of Simargaolgaol (Aglaonema modestum Schott ex Engl) leaves extract against Escherichia coli and Salmonella typhi bacteria","authors":"Tiurma Solomasi Zega, Putri Mandaoni Pakpahan, Rahmayani Siregar, Givinda Sitompul, S. Silaban","doi":"10.24114/jpkim.v13i2.26989","DOIUrl":"https://doi.org/10.24114/jpkim.v13i2.26989","url":null,"abstract":"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","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83041184","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}
Pub Date : 2021-08-01DOI: 10.24114/jpkim.v13i2.26977
Bropson Minanlarat, L. Purba, S. F. Azzahra
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
本研究旨在探讨外显式教学模式对化学学生学习成果改善的影响。显性教学模式是自由变量，因变量是学习效果。本研究方法为准实验，研究设计为非等效对照组设计。检验结果表明，sig(双尾)小于α值，即sig 0.000 < sig 0.05，表明使用显性教学模式学习对提高碳氢化合物材料化学学习效果有显著作用。此外，与使用传统学习模式(TCL)相比，使用显性教学学习模式可以使学生的学习成果提高19%。关键词:显性教学，Quizizz，化学学习，学习成果
{"title":"Improving chemical learning outcomes with explicit instruction learning models with quizizz evaluation media","authors":"Bropson Minanlarat, L. Purba, S. F. Azzahra","doi":"10.24114/jpkim.v13i2.26977","DOIUrl":"https://doi.org/10.24114/jpkim.v13i2.26977","url":null,"abstract":"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","PeriodicalId":17697,"journal":{"name":"Jurnal Pendidikan Kimia","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78730527","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}
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