P. Setiarso, R. Rusijono, A. Bahar, Samik Samik, N. Kusumawati
Standardization of ginger and curcuma tea produced by the Baureno Bojonegoro society was carried out. To get high quality products, standardization has been carried out by the washing, slicing and drying processes. Washing ginger and curcuma rhizomes was carried out for 1 min, with a thickness of 0.15 cm on each slice. To increase the shelf life of the product, it is dried on oven at 100 °C. Standardization results show optimal quality with water content of 10.83%, essential oil content of 4.01%, oleoresin of 1.53%, zingiberene (essential oil) 84.88%, gingerol (oleoresin) 67.42%, and shogaol in oleoresin of 33.95%. Meanwhile, curcuma tea products have a water content of 8.20% with essential oil content of 2.05%, curcuminoid of 1.09%, xantorizol in essential oils of 65.17%, and curcumin in curcuminoids of 85.50%. Furthermore, the processing of ginger and curcuma commodities cultivated by the Baureno Bojonegoro society has succeeded in increasing the shelf life from during 29 days to 148 days for ginger tea products, and from during 22 days to 145 days for Curcuma tea products. Keywords—tea; ginger; curcuma; washing; slicing; drying
{"title":"Standardization of Herbal Tea Quality Production Baureno Bojonegoro Society","authors":"P. Setiarso, R. Rusijono, A. Bahar, Samik Samik, N. Kusumawati","doi":"10.2991/snk-19.2019.14","DOIUrl":"https://doi.org/10.2991/snk-19.2019.14","url":null,"abstract":"Standardization of ginger and curcuma tea produced by the Baureno Bojonegoro society was carried out. To get high quality products, standardization has been carried out by the washing, slicing and drying processes. Washing ginger and curcuma rhizomes was carried out for 1 min, with a thickness of 0.15 cm on each slice. To increase the shelf life of the product, it is dried on oven at 100 °C. Standardization results show optimal quality with water content of 10.83%, essential oil content of 4.01%, oleoresin of 1.53%, zingiberene (essential oil) 84.88%, gingerol (oleoresin) 67.42%, and shogaol in oleoresin of 33.95%. Meanwhile, curcuma tea products have a water content of 8.20% with essential oil content of 2.05%, curcuminoid of 1.09%, xantorizol in essential oils of 65.17%, and curcumin in curcuminoids of 85.50%. Furthermore, the processing of ginger and curcuma commodities cultivated by the Baureno Bojonegoro society has succeeded in increasing the shelf life from during 29 days to 148 days for ginger tea products, and from during 22 days to 145 days for Curcuma tea products. Keywords—tea; ginger; curcuma; washing; slicing; drying","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128919219","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}
P. R. Wikandari, D. P. P. Panggayuh, I. G. N. A. O. Dhana
The objective of this research was to observe the potency of protease of Lactobacillus LBP 1 as meat tenderizer. The study included the proteolytic enzyme activity and the effect of the enzyme concentration to meat tenderizing. The isolation of protease used ammonium sulphate of 15, 30,40, and 60%, to be determined their specific activities. The enzyme activity was calculated as the number of protease which catalysed the releasing 1 μmol of tyrosin per minute and was measured by spectrophotometer at wave length of 274 nm. Fraction which has the highest activity then was chosen for dialysis process and the specific activity was determined. Meat tenderizing was done by immersed the meat into the enzyme extract in concentration of 0.25, 0.50, 0.75 and 1.00% respectively for 30 min. The meat tenderize was measured by penetrometer. Fraction 0f 45% ammonium sulphate showed the highest activity and has specific activity of 0.794 U/mg. Partial purificationby ammonium sulfate of this fraction by dialysis process showed a specific activity of 1.202 Unit/mg. Tenderizing of meat score correlated with the enzyme concentration and give the tenderize score of 5.3 mm/g/10s, 5.8 mm/g/10s, 6.9 mm/g/10s for immersing of enzyme concentration of 0.25, 0.50, 0.75 and 1.00% respectively for 30 min. Keywords—Lactic acid bacteria, proteolitic enzyme, specific activity, meat tenderizer
{"title":"Isolation and Utilization of Protease Lactic Acid Bacteria as Meat Tenderizer","authors":"P. R. Wikandari, D. P. P. Panggayuh, I. G. N. A. O. Dhana","doi":"10.2991/snk-19.2019.15","DOIUrl":"https://doi.org/10.2991/snk-19.2019.15","url":null,"abstract":"The objective of this research was to observe the potency of protease of Lactobacillus LBP 1 as meat tenderizer. The study included the proteolytic enzyme activity and the effect of the enzyme concentration to meat tenderizing. The isolation of protease used ammonium sulphate of 15, 30,40, and 60%, to be determined their specific activities. The enzyme activity was calculated as the number of protease which catalysed the releasing 1 μmol of tyrosin per minute and was measured by spectrophotometer at wave length of 274 nm. Fraction which has the highest activity then was chosen for dialysis process and the specific activity was determined. Meat tenderizing was done by immersed the meat into the enzyme extract in concentration of 0.25, 0.50, 0.75 and 1.00% respectively for 30 min. The meat tenderize was measured by penetrometer. Fraction 0f 45% ammonium sulphate showed the highest activity and has specific activity of 0.794 U/mg. Partial purificationby ammonium sulfate of this fraction by dialysis process showed a specific activity of 1.202 Unit/mg. Tenderizing of meat score correlated with the enzyme concentration and give the tenderize score of 5.3 mm/g/10s, 5.8 mm/g/10s, 6.9 mm/g/10s for immersing of enzyme concentration of 0.25, 0.50, 0.75 and 1.00% respectively for 30 min. Keywords—Lactic acid bacteria, proteolitic enzyme, specific activity, meat tenderizer","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114225020","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}
This study was intended to determine the feasibility of Chemtoon comic that was developed as a chemistry learning media on acid-base matter. It was conducted at SMAN 1 Wringinanom on 15 students in XI IPA 2 with heterogeneous abilities. The comic designed according to the criteria for learning media. The Method using research and development until the limited trial test. The results will ultimately be analyzed using the feasibility rule of Nieven, from aspects of validity, practicality, and effectiveness. The validity was obtained from two media expert lecturers and matter experts. The result was showed validity 82,5% of content criteria, 80% of language criteria and 87,5% of presentation criteria. Practicality is obtained from the response questionnaire given to students and supported by observation sheets of student activities. The result was showed practicality 95,2% of students respond positively to the comic. While the effectiveness obtained from the results of the pretest and posttest during the limited trial test. The result of effectiveness was showed as much as 80% of students who were succesfuly achieved minimum completeness criteria that apply in school. Keywords—Chemistry, Learning Media, comic, acid base
{"title":"The Development of Chemtoon (Chemistry Cartoon) Comic as Chemistry Learning Media on Acid Base Matter for XI grade of Senior High School","authors":"Nurus Shobah Asmiarsih, R. Rusmini","doi":"10.2991/snk-19.2019.41","DOIUrl":"https://doi.org/10.2991/snk-19.2019.41","url":null,"abstract":"This study was intended to determine the feasibility of Chemtoon comic that was developed as a chemistry learning media on acid-base matter. It was conducted at SMAN 1 Wringinanom on 15 students in XI IPA 2 with heterogeneous abilities. The comic designed according to the criteria for learning media. The Method using research and development until the limited trial test. The results will ultimately be analyzed using the feasibility rule of Nieven, from aspects of validity, practicality, and effectiveness. The validity was obtained from two media expert lecturers and matter experts. The result was showed validity 82,5% of content criteria, 80% of language criteria and 87,5% of presentation criteria. Practicality is obtained from the response questionnaire given to students and supported by observation sheets of student activities. The result was showed practicality 95,2% of students respond positively to the comic. While the effectiveness obtained from the results of the pretest and posttest during the limited trial test. The result of effectiveness was showed as much as 80% of students who were succesfuly achieved minimum completeness criteria that apply in school. Keywords—Chemistry, Learning Media, comic, acid base","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"1964 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128489523","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}
This This research aimed to find the effectiveness of a theaching instrument in order to increase students’ self efficacy and learning outcomes using Argument Driven Inquiry (ADI) teaching instrument on the electrolyte and nonelectrolyte. The test was applied to the 30 students of grade X-3 and X-4 in Senior high school 7 of Surabaya. Development model of this teaching method used the three stages 4D model from Thiagarajan (define, design, develop). The application stage in the class used Pre-test and Post-test Group Design, the evaluation used the self efficacy questionnaire, motivation questionnaire and pretest –posttest problems. The result found that the increase of average students’ self efficacy was 0.56 in medium category for experiment class and 0.08 in low category for control class, and the average increase of motivation was 0.6. In medium category for experiment class and 0.12 in low category for control class,. The average increase of learning outcomes was 0.7 in high category for experiment class and 0.5 in medium category for control class. Based on the data analysis, the developed teaching instrument effectively increases the students’ self-efficacy and learning outcomes. Keywords—effectiveness, Argument Driven Inquiry, SelfEfficacy
{"title":"Effectiveness Of Learning Media Using Argument Driven Inquiry (ADI) Learning Model To Increase Students’ Learning Outcomes And Self Efficacy","authors":"Ni'mah Tukiran, Nasrudin Choirun, Harun","doi":"10.2991/snk-19.2019.26","DOIUrl":"https://doi.org/10.2991/snk-19.2019.26","url":null,"abstract":"This This research aimed to find the effectiveness of a theaching instrument in order to increase students’ self efficacy and learning outcomes using Argument Driven Inquiry (ADI) teaching instrument on the electrolyte and nonelectrolyte. The test was applied to the 30 students of grade X-3 and X-4 in Senior high school 7 of Surabaya. Development model of this teaching method used the three stages 4D model from Thiagarajan (define, design, develop). The application stage in the class used Pre-test and Post-test Group Design, the evaluation used the self efficacy questionnaire, motivation questionnaire and pretest –posttest problems. The result found that the increase of average students’ self efficacy was 0.56 in medium category for experiment class and 0.08 in low category for control class, and the average increase of motivation was 0.6. In medium category for experiment class and 0.12 in low category for control class,. The average increase of learning outcomes was 0.7 in high category for experiment class and 0.5 in medium category for control class. Based on the data analysis, the developed teaching instrument effectively increases the students’ self-efficacy and learning outcomes. Keywords—effectiveness, Argument Driven Inquiry, SelfEfficacy","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"133 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128686344","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}
Using of natural product like colored plants or flowers as a medium for learning chemistry can realize of green chemistry principles by applying one or several of its principles. One of the principles of green chemistry that can be raised in basic chemistry learning is "use renewable feedstock". Chemistry as a science that based on experiments is inseparable from laboratory activities that require chemicals in the implementation of its activities. Actually chemistry is very close to the student daily lives. Therefore learning is designed by utilizing natural product around us for chemistry learning. Indonesia has biodiversity that potentially to be used in all fields, including in learning. One way is to utilize various types of colored plants or flowers that can found around students' lives in the territory of Indonesia as an indicator of acid and base. The research method is followed the steps of research and development. Development of learning tools with green chemistry insight for basic chemistry courses. One of them is learning media as a component of learning tools by utilizing plant or colored flowers as chemical materials in practicum which can realize green chemistry insight in learning. Based on the results and data analysis from this study, several colored flowers were identified their pH stretch and potentially to be used as natural acid base indicator in chemistry learning. Some of the colored flowers are; Hibiscus rosa sinensis, Bougainvillea glabra, and Ipomea ficifolia. It is recommended to develop this study for other plants or flowers. By utilizing natural materials as a medium for chemistry learning, it can realize green chemistry based learning by applying one of its principles Keywords—green chemistry, natural acid and base indicator,
{"title":"Utilization Of Colored Flowers as An Alternative Learning Media of Acid Base Indicator On Basic Chemistry Course With Green Chemistry Insight","authors":"M. Mitarlis, U. Azizah, B. Yonata","doi":"10.2991/snk-19.2019.36","DOIUrl":"https://doi.org/10.2991/snk-19.2019.36","url":null,"abstract":"Using of natural product like colored plants or flowers as a medium for learning chemistry can realize of green chemistry principles by applying one or several of its principles. One of the principles of green chemistry that can be raised in basic chemistry learning is \"use renewable feedstock\". Chemistry as a science that based on experiments is inseparable from laboratory activities that require chemicals in the implementation of its activities. Actually chemistry is very close to the student daily lives. Therefore learning is designed by utilizing natural product around us for chemistry learning. Indonesia has biodiversity that potentially to be used in all fields, including in learning. One way is to utilize various types of colored plants or flowers that can found around students' lives in the territory of Indonesia as an indicator of acid and base. The research method is followed the steps of research and development. Development of learning tools with green chemistry insight for basic chemistry courses. One of them is learning media as a component of learning tools by utilizing plant or colored flowers as chemical materials in practicum which can realize green chemistry insight in learning. Based on the results and data analysis from this study, several colored flowers were identified their pH stretch and potentially to be used as natural acid base indicator in chemistry learning. Some of the colored flowers are; Hibiscus rosa sinensis, Bougainvillea glabra, and Ipomea ficifolia. It is recommended to develop this study for other plants or flowers. By utilizing natural materials as a medium for chemistry learning, it can realize green chemistry based learning by applying one of its principles Keywords—green chemistry, natural acid and base indicator,","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123840116","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}
Research related to the development of teaching materials using the Argument-Driven-Inquiry model to train Students’ Science Literacy which seems not to have been done. Therefore, the purpose of this study is to produce a valid teaching materials. The developed teaching materials focused on the buffer solution matter. Teaching materials developed include lesson plan, student book, student worksheets, and science literacy tests. The Argument-Driven-Inquiry model referred to in developing teaching materials has eight steps, namely task identification; data collection and analysis; production of tentative arguments; argumentation session; compiling reports; double-blind group peer review; revised report; and explicit and reflective discussion. The science literacy trained in this study consists of six indicators. The study design used referred to the 4D Model. Data were obtained from the results of the experts' validation using a validation instrument and were subsequently analyzed using a Likert scale. Based on the assessment of experts, the materials developed have a very valid and reliable category. Thus, the materials can be ready to be used in learning with minor revision. Keywords—Validity, Teaching Material, Argument-DrivenInquiry, Science Literacy, Buffer Solution
{"title":"The Validity of Teaching Materials Oriented to Argument-Driven-Inquiry Model to Train Students’ Science Literacy","authors":"Faridatur Rofi'ah, T. Tukiran, E. Susantini","doi":"10.2991/snk-19.2019.30","DOIUrl":"https://doi.org/10.2991/snk-19.2019.30","url":null,"abstract":"Research related to the development of teaching materials using the Argument-Driven-Inquiry model to train Students’ Science Literacy which seems not to have been done. Therefore, the purpose of this study is to produce a valid teaching materials. The developed teaching materials focused on the buffer solution matter. Teaching materials developed include lesson plan, student book, student worksheets, and science literacy tests. The Argument-Driven-Inquiry model referred to in developing teaching materials has eight steps, namely task identification; data collection and analysis; production of tentative arguments; argumentation session; compiling reports; double-blind group peer review; revised report; and explicit and reflective discussion. The science literacy trained in this study consists of six indicators. The study design used referred to the 4D Model. Data were obtained from the results of the experts' validation using a validation instrument and were subsequently analyzed using a Likert scale. Based on the assessment of experts, the materials developed have a very valid and reliable category. Thus, the materials can be ready to be used in learning with minor revision. Keywords—Validity, Teaching Material, Argument-DrivenInquiry, Science Literacy, Buffer Solution","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115538768","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}
M. M. Sianita, N. Puspaningsih, Miratul Khazanah, G. Supriyanto
The synthesized of chloramphenicol – MIP (molecularly imprinted polymer) has been developed in many ways and many purposes. The purpose of this research was to compare the methods used for extracting chloramphenicol from its molecularly imprinted polymer (MIP) by calculating the percent of extraction in various ratio of template to monomer using chloroform as porogen. The result showed that the batch methods given a higher percent of extraction compared to the traditional methods Keywords—chloramphenicol, molecularly imprinted polymer, chloroform, batch, extraction
{"title":"Comparison of the method used for extraction chloramphenicol from its Molecularly Imprinted Polymer (MIP) using chloroform as porogen","authors":"M. M. Sianita, N. Puspaningsih, Miratul Khazanah, G. Supriyanto","doi":"10.2991/snk-19.2019.5","DOIUrl":"https://doi.org/10.2991/snk-19.2019.5","url":null,"abstract":"The synthesized of chloramphenicol – MIP (molecularly imprinted polymer) has been developed in many ways and many purposes. The purpose of this research was to compare the methods used for extracting chloramphenicol from its molecularly imprinted polymer (MIP) by calculating the percent of extraction in various ratio of template to monomer using chloroform as porogen. The result showed that the batch methods given a higher percent of extraction compared to the traditional methods Keywords—chloramphenicol, molecularly imprinted polymer, chloroform, batch, extraction","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131857868","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}
Kusumawati Dwiningsih, S. Poedjiastoeti, M. Muchlis
The education of prospective Chemistry teachers is faced with the issue of integration of content knowledge, pedagogy and technology (TPACK / technological pedagogical content knowledge ). Prospective teachers are expected to become teachers who are skilled in teaching effectively, mastering material (Chemistry content) and able to utilize technology for learning. The purpose of this study is to analyze the ability of TPACK prospective Chemistry teachers in Basic Inorganic Chemistry courses. This research is a descriptive study to describe the ability of TPACK prospective chemistry teachers. The subjects of this study are students of Chemistry Education Study Program who took the Basic Inorganic Chemistry Course in the odd semester 2018/2019. The ability of TPACK teacher candidates is obtained by analyzing the CoR instrument and PaPeR.TPACK in this study includes three main components of teacher knowledge, namely content, pedagogy, and technology. Based on the analysis of CoRe and PaPeR, prospective teachers can arrange big ideas to develop teaching materials 3 to 5 big ideas; Chemistry teacher candidates are good at managing teaching time and have good abilities in choosing learning strategies (85%). There are still 77% of prospective teachers showing difficulties in managing class effectively. In the aspect of mastery of content shows that 62% of prospective teachers have mastery of concepts correctly, while 38% have mastery of concepts that are not exhaustive, and there are those that lead to misconceptions. The use of learning resources based on information technology and computers still need to be maximized because it is still limited in type (power point, video, internet), still few use it (32%), as well as the selection of learning resources and media that are less relevant for the achievement of basic competencies. The conclusion is that the ability of TPACK prospective teachers still needs to be improved in several aspects of mastery of content, pedagogics and technology. Keywords—technological pedagogical and content knowledge, prospective teachers of chemistry, chemical bonds
{"title":"Analysis of Technological Pedagogical Content Knowledge (TPACK) Capabilities of Prospective Chemistry Teachers on Chemical Bonding Materials","authors":"Kusumawati Dwiningsih, S. Poedjiastoeti, M. Muchlis","doi":"10.2991/snk-19.2019.35","DOIUrl":"https://doi.org/10.2991/snk-19.2019.35","url":null,"abstract":"The education of prospective Chemistry teachers is faced with the issue of integration of content knowledge, pedagogy and technology (TPACK / technological pedagogical content knowledge ). Prospective teachers are expected to become teachers who are skilled in teaching effectively, mastering material (Chemistry content) and able to utilize technology for learning. The purpose of this study is to analyze the ability of TPACK prospective Chemistry teachers in Basic Inorganic Chemistry courses. This research is a descriptive study to describe the ability of TPACK prospective chemistry teachers. The subjects of this study are students of Chemistry Education Study Program who took the Basic Inorganic Chemistry Course in the odd semester 2018/2019. The ability of TPACK teacher candidates is obtained by analyzing the CoR instrument and PaPeR.TPACK in this study includes three main components of teacher knowledge, namely content, pedagogy, and technology. Based on the analysis of CoRe and PaPeR, prospective teachers can arrange big ideas to develop teaching materials 3 to 5 big ideas; Chemistry teacher candidates are good at managing teaching time and have good abilities in choosing learning strategies (85%). There are still 77% of prospective teachers showing difficulties in managing class effectively. In the aspect of mastery of content shows that 62% of prospective teachers have mastery of concepts correctly, while 38% have mastery of concepts that are not exhaustive, and there are those that lead to misconceptions. The use of learning resources based on information technology and computers still need to be maximized because it is still limited in type (power point, video, internet), still few use it (32%), as well as the selection of learning resources and media that are less relevant for the achievement of basic competencies. The conclusion is that the ability of TPACK prospective teachers still needs to be improved in several aspects of mastery of content, pedagogics and technology. Keywords—technological pedagogical and content knowledge, prospective teachers of chemistry, chemical bonds","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134513699","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}
R. K. Dewi, M. I. Hudha, Anindita Rauda, Safarina Tsulusia
Pecan shell is an abundant amount of biomass waste and has the potential as one of the fuels, with a very hard texture and having holocellulose content of 49.22% and lignin 54.46%. Whereas the pecan shell composition after in the form of 100 mesh powder was 33% hemicellulose, 17% cellulose and 34% lignin. In order to be used as an alternative fuel, one of the initial stages that needs to be carried out is through the process of degradation of lignin or the delignification of components present in pecan shells. The process of concentration and microwave process time at microwave power 440 Watts was successfully degraded through a combination of chemical and physical processes with variables of NaOH. The NaOH concentrations used were 1N, 2N, and 3N while the delignification times were 5, 10, 15, 20, and 25 minutes. From the analysis with the Chesson method, the lowest lignin levels reached 6% at 2N NaOH concentration and 20 minutes process time. With the data generated, it can be concluded that the process of combination of chemistry and physics can reduce lignin levels in pecan shell powder by 82.35% Keywords—Delignification, NaOH-Microwave, Cellulose, Hemicellulose, lignin
{"title":"Chemical and Physical Process Combinations: Microwave in Lignin Degradation of Pecan Shells as Alternative Fuel Raw Materials","authors":"R. K. Dewi, M. I. Hudha, Anindita Rauda, Safarina Tsulusia","doi":"10.2991/snk-19.2019.16","DOIUrl":"https://doi.org/10.2991/snk-19.2019.16","url":null,"abstract":"Pecan shell is an abundant amount of biomass waste and has the potential as one of the fuels, with a very hard texture and having holocellulose content of 49.22% and lignin 54.46%. Whereas the pecan shell composition after in the form of 100 mesh powder was 33% hemicellulose, 17% cellulose and 34% lignin. In order to be used as an alternative fuel, one of the initial stages that needs to be carried out is through the process of degradation of lignin or the delignification of components present in pecan shells. The process of concentration and microwave process time at microwave power 440 Watts was successfully degraded through a combination of chemical and physical processes with variables of NaOH. The NaOH concentrations used were 1N, 2N, and 3N while the delignification times were 5, 10, 15, 20, and 25 minutes. From the analysis with the Chesson method, the lowest lignin levels reached 6% at 2N NaOH concentration and 20 minutes process time. With the data generated, it can be concluded that the process of combination of chemistry and physics can reduce lignin levels in pecan shell powder by 82.35% Keywords—Delignification, NaOH-Microwave, Cellulose, Hemicellulose, lignin","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114765640","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}
Misconception has a close correlation with mental models. The aim of this study is to know the track of student conceptions trough the misconception (MC) remediation using Conceptual Change Module (CCM) based on mental model in electron configuration concept. The research using one group pretest and postest. The research subject were class X MIPA students of SMAN 1 Bojonegoro who had teacher atomic structure material, had a number of misconception (MC) and were at a low level of perception based on CRI diagnostic test and detecting the causes of mental model based chemical misconceptions (P2M3) test. The results were analyzed by qualitative descriptive and inferential statistic. The results show that: (1) The initial conception step was dominated by MC, only 3 students whose in a lack of knowlege (LC), (2) The validation step only 1 student who changed into LC, (3) The cognitive conflict step has changed 21 students to knowledge the correct concept (KCC), 8 LC students, and leaves 1 student who remains MC, (4) giving assistance for equilibration step showed that KCC status was achieved by all students and maintained until the end of the CCM step, (5) CCM was successfully reduce a number of MC to KCC. The decrease of MC was 80%. The MC shifting to KCC, MC becoming LC, and MC still MC in a row by 75%, 14%, and 11%. Keywords—Remediation of misconception, CCM, mental models, perception.
{"title":"The students’ conception track of low-perception-students trough the conceptual change (CCM) module based on mental models on electron configuration concept","authors":"N. Pratiwi, S. Suyono, Yuanita Leny","doi":"10.2991/snk-19.2019.40","DOIUrl":"https://doi.org/10.2991/snk-19.2019.40","url":null,"abstract":"Misconception has a close correlation with mental models. The aim of this study is to know the track of student conceptions trough the misconception (MC) remediation using Conceptual Change Module (CCM) based on mental model in electron configuration concept. The research using one group pretest and postest. The research subject were class X MIPA students of SMAN 1 Bojonegoro who had teacher atomic structure material, had a number of misconception (MC) and were at a low level of perception based on CRI diagnostic test and detecting the causes of mental model based chemical misconceptions (P2M3) test. The results were analyzed by qualitative descriptive and inferential statistic. The results show that: (1) The initial conception step was dominated by MC, only 3 students whose in a lack of knowlege (LC), (2) The validation step only 1 student who changed into LC, (3) The cognitive conflict step has changed 21 students to knowledge the correct concept (KCC), 8 LC students, and leaves 1 student who remains MC, (4) giving assistance for equilibration step showed that KCC status was achieved by all students and maintained until the end of the CCM step, (5) CCM was successfully reduce a number of MC to KCC. The decrease of MC was 80%. The MC shifting to KCC, MC becoming LC, and MC still MC in a row by 75%, 14%, and 11%. Keywords—Remediation of misconception, CCM, mental models, perception.","PeriodicalId":256735,"journal":{"name":"Proceedings of the National Seminar on Chemistry 2019 (SNK-19)","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122835127","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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