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91	Chemistry Education	ABS-132
Conducting Literature Review as a Didactical Content Analysis: The Example of Sustainable Magnetic Lubricants Based on Ionic Liquids Sevilla Arita Abdul Jalil (a), Ahmad Mudzakir (a*), Hernani (a) a) Departemen Pendidikan Kimia, Universitas Pendidikan Indonesia Jl. Dr. Setiabudi N0. 229, Bandung, 40154, Indonesia *mudzakir.kimia[at]upi.edu Abstract Magnetic lubricants are usually petroleum-based, but not renewable and cannot be environmentally degraded. Magnetic lubricants based on ionic liquids can be environmental friendly. The ionic liquid lubricants are synthesized from vegetable oil fatty acids, which is a locally sustainable and renewable sources. This molecular engineering can be used to integrate the concept of sustainability into teaching and learning. This study aimed to obtain the concept map and teaching learning sequence (TLS) from the scientist^s conception. The method used is a qualitative content analysis (literature analysis type), using an instrument in the form of a content analysis format. The first phase is begin with the collecting literature in the form of textbooks, monographs, review results and research articles. The next phase is conducting descriptive analysis, selecting categories, and evaluating the material didactically. This research produces the concept map, TLS and clarified chemical concepts. The scientist^s conception obtained is the application, function, characteristics, synthesis and analysis of magnetic lubricants based on ionic liquids. Concept map and TLS can illustrate the relationship between one concept and another. They also show the relationship between science, technology and engineering. The results can be used as the basis for the preparation of teaching materials and didactical designs for teaching and learning. Keywords: Magnetic Lubricants, Ionic Liquids, Sustainability, Didactics and Content Analysis Share Link | Plain Format | Corresponding Author (Sevilla Arita Abdul Jalil)

92	Chemistry Education	ABS-400
The use of simple spectrophotometer in STEM education: A bibliometric analysis A. S. Shidiq, A. Permanasari, Hernani, S Hendayana Program Studi Pendidikan IPA, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Setiabudhi No. 229, Bandung, 40154, Indonesia Abstract The use of simple spectrophotometers for the teaching and learning process is developing recently. There have been many publications and research on using simple spectrophotometers in chemistry and other STEM areas. A review of the extent of research and publications using this simple spectrophotometer is needed to understand this domain better. This study aims to provide a bibliometric analysis on the topic of the ^simple spectrophotometer.^ By using the VOSviewer software, bibliometric analysis methods from 128 articles were used in this study. The articles were selected based on the inclusion and exclusion criteria predefined. The results of this study indicate that several simple spectrophotometer instruments have been used for teaching and learning in chemistry and other STEM areas, such as UV-Vis and photometers. This instrument was built by replacing the main components in the spectrophotometer, such as the light source and detector, to be simpler. The development of other types of spectrophotometers that involve students in building them can be a potential research alternative in Chemistry and other STEM areas. This research is expected to provide a better understanding of the potential and utilization of a simple spectrophotometer. Keywords: Bibliometric analysis, Chemistry learning, Simple spectrophotometer, STEM Share Link | Plain Format | Corresponding Author (Ari Syahidul Shidiq)

93	Chemistry Education	ABS-146
Interactive Multimedia Innovation Based on Android Using Smart Apps Creator 3.0 as Learning Media for Buffer Solution Materials Gusti Rahman (a*), Nurfajriani (b), and Iis Siti Jahro (c) (a) Departemen Pendidikan Kimia, Universitas Negeri Medan, Jl. Willem Iskandar / Pasar V, Medan, Sumatera Utara 20221, Indonesia *gustirahman00[at]gmail.com (b,c) Departemen Pendidikan Kimia, Universitas Negeri Medan, Jl. Willem Iskandar / Pasar V, Medan, Sumatera Utara 20221, Indonesia Abstract The use of interactive multimedia based on android into chemistry learning will make the process of learning more effective, efficient, and interesting. This study focuses on developing interactive multimedia based on android using the help of Smart Apps Creator 3.0 software, and improving student learning. This research is a kind of 4D model development research (Define, Design, Develop, Disseminate). The research sample consisted of 25 students of class XI Senior High School Grade. The results showed that the interactive multimedia based on android developed was related to BSNP with the average acquisition of a eligibility test from a material expert of 3.80 and an average eligibility of a media expert of 3.81 on a scale of 4.00. The learning outcomes of students who were taught using Android-based interactive multimedia were in high chategory with an N-Gain value of 0.71, and the learning outcomes obtained by students were higher than the KKM value set at school of 75. These results indicated that this Android-based interactive learning multimedia was appropriate to use into buffereded solution material for High School Teaching and Learning Process. Keywords: Interactive Multimedia, Android, Smart Apps Creator 3.0, Research and Development, Buffer Solution Share Link | Plain Format | Corresponding Author (Gusti Rahman)

94	Chemistry Education	ABS-148
The Urgency of Implementation RADEC Learning Model to Understanding of Three Levels Representation in Chemistry Learning: Literature Review Ismi Yohana(a*), Wahyu Sopandi(b), Wawan Wahyu(b) Universitas Pendidikan Indonesia Abstract The concept of chemistry is closely related to interpreting the three levels of representation. The three levels of representation are: (1) macroscopic, which describes observable phenomena- (2) submicroscopic, which consists of atomic and molecular models and (3) symbolic, in which submicroscopic models and observable data are expressed symbolic, for example through chemical equations. Chemistry abstract concepts are considered difficult by most students, especially when placed to believe in something they cannot perceive with the senses. The design used literature review, the articles collected with the criteria used are those published in 2010-2018. Based on the articles that were collected, it was found that. RADEC learning model is in accordance with learning habits in Indonesia and the RADEC learning model is an alternative learning model that is able to improve concept mastery, reading skills and improve students high order thinking skills (HOTS). Suggestions for in-depth research, especially on understanding the three levels of representation of students with a background in teaching and learning habits in Indonesian. Keywords: Concept, three levels representation, RADEC learning model Share Link | Plain Format | Corresponding Author (Ismi Yohana)

95	Chemistry Education	ABS-405
Ethnoscience Approach For Enhancing Student^s Scientific Literacy in Food Additives Learning at Secondary School Nadira Renata Putri (a)- Prof. Dr. Anna Permanasari, M.Si (b*)- Eliyawati, M.Pd (a*) a) International Program on Science Education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia *eliyawati[at]upi.edu b) Department of Chemistry Education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia *anna.permanasari[at]upi.edu Abstract Scientific literacy is needed in 21st-century learning which develops students to make the right decision in daily life. The development can be achieved through related local wisdom in the learning process. This research aims to analyze the implementation of the ethnoscience approach for improving students^ scientific literacy in learning food additives. This research used descriptive method. The participants involved were 34 students from grade 8th junior high school in Bandung who chosen by convenience sampling. Data collection is done by observation. The results of this, the implementation of ethnoscience approach to enhancing students^ scientific literacy need to be done by focusing on the preparation and implementation stage. The lesson plan has to be flexible according to the student^s conditions. For better results, the food additives topic should be state clearer to avoid confusion in students. Keywords: Ethnoscience Approach- Scientific Literacy- Food Additives Share Link | Plain Format | Corresponding Author (Nadira Renata Putri)

96	Chemistry Education	ABS-150
The Amazing Eco-Enzyme: Contextual 3D Pageflip e-Book for Environmental Chemistry Learning Anis Mugitsah*, Sari, Cucu Zenab Subarkah Department of Chemistry Education, UIN Sunan Gunung Djati Bandung Jl. A. H. Nasution No.105, Bandung, 40614, Indonesia *anismugitsah[at]gmail.com Abstract The e-book transformation allows the efficiency of book pages become a one-page screen, so that students can use their gadgets to access learning anytime and anywhere. Along with Green Chemistry (GC) approach, chemistry needs to be taught contextually to facilitate students in understanding the relationship between the knowledge and its implementation in real life, especially actual phenomena. This study uses the DBR (Design-Based Research) method to describe the stages of production, the display, the validation test, and the feasibility test of a 3D Pageflip e-book entitled The Amazing Eco-Enzyme, which discusses the production, the characterization, and the application of Eco-Enzyme for environmental sustainability. Contents of the e-book are presented contextually including facts, concepts, applications, and values, in the form of environmental pollutions issues, principal of chemistry, environmental conservation, and integrated Islamic values, respectively. Those topics emphasize the study of pollutants and environmental pollution, such as water, soil, and air, as well as biogeochemistry and environmental toxicology. The results of the validation test indicate that the e-book is valid, by the range of r 0,85-0,92. It was revised, then a feasibility test is carried out on ten respondents who were selected through purposive sampling. The feasibility test obtained a percentage of 96,67% on the material aspect, 92,50% on the language aspect, and 95,00% on the appearance aspect. The e-book is very feasible and can easily be accessed on a website as an enrichment book to support the learning process of environmental chemistry. Keywords: 3D pageflip e-book- Contextual- Eco-Enzyme- Environmental chemistry Share Link | Plain Format | Corresponding Author (Anis Mugitsah)

97	Chemistry Education	ABS-153
Development on Chemistry Puzzles Book of Class X High School Sri Setiawaty (a), Isna Rezkia Lukman (a*), Ratih Permana Sari (b), Riska Imanda (a), Lia Mursyida (a) a) Department of Chemistry Education, Universitas Malikussaleh, Aceh, Indonesia *rezkia.lukman[at]unimal.ac.id b) Department of Chemistry Education, Universitas Samudra, Aceh, Indonesia Abstract This study aims to determine the quality and responses of students to the chemistry puzzles book as a learning media. The development model used is ADDIE with the stages of Analysis, Design, Development, Implementation and Evaluate. Learning media quality testing is carried out based on validation by media experts and material experts. Then the feasibility test was conducted on seven chemistry subject teachers at three schools, namely 2 teachers from SMA Negeri 1 Tanah Pasir, 2 teachers from SMA Negeri 1 Matangkuli and 3 teachers from SMA Negeri 1 Syamtalira Aron. Then a student response test of 60 students from 3 schools was carried out to see the students responses to the learning media. The results showed that (1) from the results of the media expert validation, it was known that the total score obtained was 79 with a percentage of 75.7%, and the mean score was 3.03 with the category ^very feasible^, (2) from the results of the material expert validation. It is known that the total score obtained was 115 with a percentage of 92.7%, and the average score was 3.7 with the ^very feasible^ category, (3) the results of the feasibility test showed that the percentage of the average score was 87.12 with the category ^very feasible^, (4) the results of the student responses showed that the total average score was 4.4 in the ^very good^ category. For the overall results it can be stated to have good quality of chemistry puzzles book as a learning media for use in class X SMA students. Keywords: ADDIE, chemistry puzzles book, learning media Share Link | Plain Format | Corresponding Author (Isna Rezkia Lukman)

98	Chemistry Education	ABS-162
The Effect of A Guided Inquiry Learning Model Use Focusky Media And Learn Activities For Results Learning High School Students Basic Discuss Of Hydrolysis Rona Rezky Mentari(a*), Ajat Sudrajat(b), Retno Dwi Suyanti(b) a) Chemistry Education Postgraduate Program, Medan State University, Jl. W. Iskandar Psr V, Medan, North Sumatra 20221, Indonesia b) Lecturer of Chemistry Education Undergraduate and Postgraduate Program, Medan State University, Jl. W. Iskandar Psr V, Medan, North Sumatra 20221, Indonesia Abstract Guided inquiry model is a learning model whose implementation, Guided inquiry model is a learning model whose implementation, the teacher provides guidance that is broad enough to students. In addition to choosing a learning model, a teacher must be able to choose the right learning media. In this study, the media focusky can make students more interested in participate in classroom learning. This research aims to- (1) to determine effect of guided inquiry learning model use the Focusky media on the learning of high school students- (2) to determine effect of learning activities on learning of high school students and- (3) to determine effect of the interaction between guided inquiry learn use Focusky and learn activities of high school students. The sample of this research was high school students class XI MIPA 1 SMAN 1 Tanjung Pura in the academic year 2020/2021. The design in this study is a single group pretest-posttest (one group pretest-posttest design). Testing in this study was carried out only in one class, no control group or comparison group was used as the measurement. The technique in this study was carried out in two stages, first collecting data about student learning activities and second collecting data about high school student learning outcomes. The conclusion in this study, there is an effect of guided inquiry learning model using focusky media on the learning outcomes of high school students. There is an increase in learning activities towards high school student learning outcomes, and an increase in the interaction between inquiry learning using focusky media Keywords: Guided Inquiry- Focusky- Learning Activation- Learning Outcomes- Share Link | Plain Format | Corresponding Author (rona rezky mentari)

99	Chemistry Education	ABS-418
THE IMPLEMENTATION OF PERFORMANCE ASSESMENT BY ANDROID BASED VIRTUAL LABS TO IMPROVE STUDENTS^ SCIENCE PROCESS SKILLS DURING THE LEARNING ACTIVITIES IN COVID-19 PANDEMIC Molani Paulina Hasibuan(a), Ratih Permana Sari(a*), Seprianto(a), Nahadi(b), Syaeful Anwar(b) (a)Department of Chemistry Education, Faculty of Teacher Training and Education, Samudra University (b)Department of Chemistry Education, Faculty of Teacher Training and Education, Indonesian Education University Abstract This study aims to determine the effect of implementing performance assessment through android-based virtual lab learning in improving students^ science skills during online learning. The research method used a quasi-experimental design with the Nonequivalent Control Group Pretest-posttest Design. The study involved two classes, namely XI IPA 6 as the experimental class and XI IPA 11 as the control class. The data used is descriptive quantitative. The results showed that the application of performance assessment through android-based virtual laboratory learning for the experimental and control classes was in a good percentage. However, several indicators need to be improved. The experimental class experienced a better improvement after implementing performance assessments for each indicator of science skills. The application of formative assessment to science skills showed a significant relationship. There is an increase in science skills in the high category (0.70) after implementing performance assessments through android-based virtual labs. Also, the student response to android-based virtual labs learning is quite good at 85%. Furthermore, there was an increase in student learning outcomes with a class average of 88. These outcomes showed that the implementation of performance assessment through android-based virtual labs had a positive impact even though it was carried out in a covid19 pandemic. Keywords: Virtual Lab- Science Procces Skill- Performance assesment- Android Based Share Link | Plain Format | Corresponding Author (Ratih Permana Sari)

100	Chemistry Education	ABS-424
THE USE OF CONCEPTUAL CHANGE TEXT (CCT) BASED TEACHING MATERIALS TO IMPROVE MULTIPLE ABILITY OF PHARMACEUTICAL CHEMICAL REPRESENTATION STUDENTS Wati Sukmawati, Asep Kadarohman,Omay Sumarna, Wahyu Sopandi Universitas Muhammadiyah Prof.DR. HAMKA Universitas Pendidikan Indonesia Abstract The study analyzes the effect of text-based concept-based teaching (CCT) on first-semester pharmaceutical students^ concept changes in understanding various chemical representations of the concepts of reduction and oxidation (redox). In the initial stage, Performed diagnostic tests on students, interviews with ten first-semester students, and data obtained from these interviews and related literature were used to develop CCT-based redox teaching materials. In this study, a concept understanding test was used. This test is given to 50 first-semester pharmacy students. The experimental group consisted of 25 students who received CCT-based teaching materials, and the control group consisted of 25 students who received conventional teaching materials. Before instruction, students in both groups were pre-tested to determine their prior understanding of redox. The results showed that students in both groups had the same redox knowledge. After the study, the data were analyzed using a two-way analysis of covariance using multiple representations of student scores as covariates. The results showed that some student representations of chemical redox concepts developed with CCT-based teaching materials were able to reduce what students experienced, resulting in a much more significant understanding of redox concepts when compared to the control class. Keywords: Conceptual Change Text (CCT), Multiple Representations, Oxidation-Reduction Share Link | Plain Format | Corresponding Author (Wati Sukmawati)

101	Chemistry Education	ABS-425
Application of Online Student Activity Sheet (SAS) to Measure Student Performance in Learning Science-Islamic of Food Additive Cucu Zenab Subarkah (a*), Uus Ruswandi (b), Kasmadi Imam Supardi (c), Chaerul Rochman (d) a). Postgraduate Program at UIN Sunan Gunung Djati jalan Soekarno Hatta, Bandung *zenabsc[at]uinsgd.ac.id b). Postgraduate Program at UIN Sunan Gunung Djati jalan Soekarno Hatta, Bandung c). Chemical Department FMIPA UNNES Sekaran Gunungpati Semarang 50229 d). Physical Education Department UIN Sunan Gunung Djati jalan Soekarno Hatta, Bandung Abstract The purpose of this study is to describe the performance of Chemistry students at UIN SGD Bandung during online learning process of Science-Islamic of food additive. The method used was a pre-experiment with one shot case study research design, using SAS as a measure of performance during the learning process. The average score of performance based on SAS for Chemistry Education Study Program students is 62.05 and the Chemistry Department is 64.72. The result of the t test calculation shows that the t value is 1.095 (using absolute value) with a significance level of 0.275. This significance value is greater than the significant level of 0.05 so it means there is no difference in the average performance between students of Chemistry Education Study Program and Chemistry Department. This shows that SAS can measure the performance of chemistry students during the online learning process. Keywords: Performance- Worksheet- Science-Islamic- Food additives Share Link | Plain Format | Corresponding Author (Cucu Zenab Subarkah)

102	Chemistry Education	ABS-170
Needs Analysis on Phenomenon Based Learning Media in Higher Education Asyti Febliza(a*), Zul Afdal (b), Jimmi Copriyadi (c) and Dedi Futra (c) a) Departemen Pendidikan Kimia, Universitas Islam Riau, Jl. Kaharuddin Nst No. 113, Pekanbaru 28284, Indonesia b)Departemen Pendidikan Ekonomi, Universitas Negeri Padang, Jl. Prof. Dr. Hamka No. 1, Padang 25171, Indonesia c)Departemen Pendidikan Kimia, Universitas Riau, Jl. H.R. Subrantas KM 12,5, Pekanbaru 28293, Indonesia *asytifebliza[at]edu.uir.ac.id Abstract The phenomenon-based learning (PhenoBL) is a multidisciplinary instructional approach that is learner-centred and based on student inquiry and problem-solving. PhenoBL challenges students to find out why and how things occur, then apply their knowledge to real-world problems. Lecturers can introduce the phenomenon by using media to help students recall their experiences. Therefore, the needs of students and lecturers are essential to consider for producing appropriate media. This research aimed to identify the needs of students and lecturers toward phenomenon-based learning media in general chemistry subjects. This survey recruited 383 students and 21 lectures of science programs from various universities in Indonesia. Data collected by using an online semi-structured questionnaire designed in a google form survey. In the questionnaire, a brief description of the PhenoBL approach explained. The findings revealed that both students and lecturers needed PhenoBL media to reach the chemistry concept and solve various daily life problems from diverse aspects. The majority of students and lecturers chose interactive multimedia and video as appropriate media types to integrate PhenoBL. Researchers also surveyed compatible the general chemistry topics taught by PhenoBL and selected issues by respondents: acids and bases, electrolyte and non-electrolyte, and colloidal mixture. In addition, lecturers gave contention that PhenoBL could direct students to think critically. Finally, both students and lecturers agreed about PhenoBL media development to help learners gain information about daily life phenomena. Keywords: Need Analysis, Phenomenon-based learning, General Chemistry, Video, Interactive multimedia Share Link | Plain Format | Corresponding Author (Asyti Febliza)

103	Chemistry Education	ABS-427
Development and Validation of Performance Assessment Instrument in Making Standart Solutions for Titration Nadya Rahmania (a), Harry Firman (b), Nahadi (c) Indonesia University of Education (a,b,c) Abstract Performance assessment in the instrument laboratory had been required to identify the students^ competency objectively. This research aimed to provide a performance assessment instrument in making standart solutions for titration. The method was the development and validation through 4 stages: planning, development, validation, and evaluation. The validation results collected by the expert team described that among 23 valid assessments, the 18 were valued CVR 1, and the rest were invalid with value CVR below the critical point (0.736). Meanwhile, the overall Assessment validations were valid with a CVI value of 0.83. Based on questionnaires on several analitical chemistry teacher instruments, they all agreed that performance assessment, which had been developed, was effective and feasible to use. Keywords: Performance Assessment, Task and Rubric, Standart Solutions, Titration Share Link | Plain Format | Corresponding Author (Nadya Rahmania)

104	Chemistry Education	ABS-174
Development of Animated Video-Based Learning Media on Electrolyte and Non-Electrolyte Solution Material for Senior High School Students Putri Novira (a*), Saronom Silaban, and Albinus Silalahi Departemen Pendidikan Kimia, Universitas Negeri Medan, Jl. Willem Iskandar Pasar. V, Medan 20221, Indonesia *putrivira2[at]gmail.com Abstract This study aims to develop an animated video-based learning media on electrolyte and non-electrolyte solution material for senior high school students. This study is a development research that used the ADDIE approach. The research subjects consisted of material experts, media experts, and students class X of SMAN 1 Tanah Jambo Aye as many 26 students as respondents. The instrument used was a questionnaire. Data analysis using descriptive quantitative. The result shown that the animated video based-learning media validation of the material aspects carried out by two experts obtained an average score of 3.77 with a percentage of 94.31% is very feasible. validation of media aspects carried out by media experts obtained an average score of 3.7 with a percentage of 92.5% is very fesible.The result of the percentage of practicality of animated video-based learning media is 93.46% with the category is very practical. Therefore, animated video-based learning media are declared valid and practical to use in the classroom. Further research is needed to investigate the effect of media use in the classroom and the correlation between motivation and learning outcomes. Keywords: Development- Learning Media- Animated Video Share Link | Plain Format | Corresponding Author (Putri Novira)

105	Chemistry Education	ABS-441
Using Virtual Reality as a Learning Media: Advantages and Challenges Indah Sari(a,c*), Parlindungan Sinaga(a), Hernani Hernani(a), and Ahmad Mudzakir(b) a) Program Studi Pendidikan Ilmu Pengetahuan Alam, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia b) Departemen Pendidikan Kimia, FPMIPA, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia c)Program Studi Pendidikan Kimia, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Sultan Ageng Tirtayasa, Jl. Ciwaru Raya No.25, Serang 42121, Indonesia Abstract This study addresses advantages and challenges of using VR technology as a learning media. An investigation has been made to find out the opinions of teachers about the difficulties of teaching and the advantages of using VR on learning activities based on their experience. Participants who elaborate in this study are 20 teachers (11 male teachers and 9 female teachers) who are taking the VR Ambassador Program. The items consist of 15 questions that have been already analyzed by Rasch analysis. Rasch analysis explains the difficulties experienced by teachers and the advantages of using VR as learning media. The result shows that most teachers experience difficulties when teaching only orally without adequate learning media. Almost all teachers agree that the use of VR as a learning media can help students gain knowledge, understanding, applying their knowledge to new situations, analytical skills, evaluating abilities, and VR can also help increase students^ engagement, motivation, and attention. This study also discusses the challenges: costs and teacher^s capability of VR technology. Keywords: virtual reality, learning media, rasch analysis, Millea Lab Share Link | Plain Format | Corresponding Author (Indah Sari)

106	Chemistry Education	ABS-443
AN INTERACTIVE MULTIMEDIA OF HPLC: ENHANCING STUDENT ANALYTICAL THINKING SKILLS Yulina Indah Karina, Permanasari Anna, Hernani, Setiawan Wawan Universitas Pendidikan Indonesia Abstract An Interactive Multimedia of HPLC was developed as an alternative media to assist for understanding concepts and enhance students analytical thinking skills. The purpose of this study was to see learning outcomes, the results of analytical thinking skills, and student perceptions in HPLC Practicum using Interactive Multimedia assisted by HPLC simulators. The research method is Quasi-experiment, One group pre-test, and post-test design. The instruments in this study were test and non-test instruments in the form of student satisfaction questionnaires and observation of learning outcomes. The results showed that the use of interactive multimedia HPLC with the help of the HPLC simulator improved student learning outcomes with an average N-gain of 0.44 (moderate), and the students^ analytical thinking skills increased as follows, matching (90%), classifying (86%), analyzing error (80%), generalizing (76%), and specifying (83%). Meanwhile, the results of the student perception questionnaire showed that student satisfaction with the use of MMI HPLC was 86%, the meaningfulness of the material was 88%, and the suitability of the media to the student^s condition was 90%. The limitations of learning methods during the Covid-19 Pandemic made MMI HPLC an alternative learning that attracts student interest and motivation because in addition to containing material and videos, it is also equipped with practice questions that can immediately determine the results. To see the effectiveness of media use more broadly, implementation can be carried out in other universities. Keywords: HPLC, Interactive Multimedia HPLC, Simulator HPLC, Analytical Thinking Skills Share Link | Plain Format | Corresponding Author (Indah Karina yulina)

107	Chemistry Education	ABS-449
Students Competence in Linking Chemical Representations on Acid-Base Concepts: A Preliminary Study Hazmi Fauzi (a*), Sri Mulyani (a), Wiji (a) a) Departemen Pendidikan Kimia, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229, Bandung, 40154, Indonesia *hazmy.fauzy[at]gmail.com Abstract As in other chemical concepts, Acid-base concept involves phenomena related to three levels of chemical representation including macroscopic, submicroscopic and symbolic. This study aims to determine the description of students competence in linking various chemical representations on acid-base concept. The method used is descriptive qualitative by conducting a semi-structured interview with 11th grade students. Various representations of the three types are given to students and they are asked to explain and link to each other. The interconnection patterns that may emerge from this research can be: 1) Macroscopic, Submicroscopic, Symbolic 2) Macroscopic, Symbolic, Submicroscopic 3) Submicroscopic, Macroscopic, Symbolic 4) Submicroscopic, Symbolic, Macroscopic 5) Symbolic, Macroscopic, Submicroscopic 6) Symbolic, Submicroscopic, Macroscopic. The results showed that the 11th grade students competence in linking the three levels of chemical representation was quite low, especially in linking submicroscopic representations to symbolic representations. In general, the competence in linking various types of representations is still a tough task for students so that efforts are needed to overcome this. The results of this study then can be used as a basis for developing supporting teaching materials in increasing the linking competence toward chemical representations, one of which is electronic module. Keywords: representational linking competence, three levels of chemical representation, acid-base, electronic module Share Link | Plain Format | Corresponding Author (Hazmi Fauzi)

108	Chemistry Education	ABS-203
Innovation Teaching Material Based on Project Based Learning (PjBL) on Hydrolysis Material Retno Widiastuti (a*), Marham Sitorus (b), Iis Siti Jahro (b) a) State University Of Medan, Jalan Willen Iskandar Pasar V Medan Estate, Medan 20221, Indonesia humas[at]unimed.ac.id b) Faculty of Math and Science, Chemistry education Abstract This study aims (1) To design and implement project-based learning innovation based on hydrolysis material for Class XI at SMA Cerdas Murni. (2) To find out the student^s response to the innovation of teaching materials based on Project Based Learning on the hydrolysis material of Class XI at SMA Cerdas Murni. The research method used in this research is research and development. with the ADDIE development model. The subjects of this study were students of class XI at SMA Cerdas Murni 2020/2021 academic year. To find out student responses to teaching materials obtained by using a questionnaire method. The results showed that: 1) The results of the design and implementation of teaching materials that have been developed on the hydrolysis material for class XI students using the Project Based Learning learning model in SMA Cerdas Murni were declared successful based on several tests carried out. 2) The results of the student response data analysis showed that the percentage of students who gave very good responses was 20%, the percentage of students who gave good responses was 80%, and there were no students who gave sufficient, insufficient, or very poor responses. Keywords: Teaching Material, Hydrolysis, Projec Based Learning (PjBL) Share Link | Plain Format | Corresponding Author (RETNO WIDIASTUTI)

109	Chemistry Education	ABS-208
How Does Chemistry of Rare Earth Metals Coordination Complexes Can Enhance System Thinking Ability? A Qualitative Content Analysis Study Banu Kisworo (a)(b), Ahmad Mudzakir (c*), Liliasari (c) a) Doctorate Program of Science Education, School of Post Graduate Studies, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia b) Department of Chemistry Education, Universitas Muhammadiyah Cirebon, Jl. Tuparev No. 70, Cirebon 45153, Indonesia c) Department of Chemistry Education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia *mudzakir.kimia[at]upi.edu Abstract Chemistry of rare earth metals coordination complexes has a potential as a material for teaching and learning sustainable chemistry principles. These principles consider environmental, society and economic aspects. System thinking has an important role to linking the chemistry of rare earth metals coordination complexes to the principle of sustainability. This study was conducted to obtain scientist conception about chemistry of rare earth metals coordination complexes as sustainable material that emphasized enhancement students system thinking ability. The Method used is qualitative content analysis (inductive literature review type). It is includes the collection of research articles, descriptive analysis, category selection and material evaluation based on didactical view. In inductive approach, determining definitions and coding for each category can be developed after the materials have been analyzed. The instrument used is a content analysis format related to the concept of rare earth metals coordination complexes. The results showed that the scientist^s conception of rare earth metals coordination complexes can be analyzed to qualitative with used inductive approach. The scientist^s conception was obtained which are important concepts such as synthesis, characterization, and application of material based on rare earth metals. The synthesis of coordination complexes is carried out using central atoms in the form of metals and/or rare earth ions with several of ligands. The characterization of complexes compound conducted to determine their solubility, compositions, crystal structure, and physicochemical properties. The materials of the rare earth metals coordination complexes are widely used in the manufacture of electronic equipment because its ability is more long time, easy to recharging and recycling. Based on its application reviewed, chemistry of coordination complexes showed environmentally safe properties, safe to society, and increase economic value. Keywords: Chemistry of coordination complexes- Rare earth metals- Sustainability- System thinking Share Link | Plain Format | Corresponding Author (Banu Kisworo)

110	Chemistry Education	ABS-214
The Validity and Reliability of Analytical Thinking Skill Instrument for The Material of Chemical Equilibrium Fatika Fani Rahayu (a*) Isana Supiah Yosephine Louise (b) a) Master of Chemistry Education, Faculty Mathematics and Natural Science, Universitas Negeri Yogyakarta Jl. Colombo No. 1, Karang Malang, Caturtunggal, Depok, Sleman, Daerah Istimewa Yogyakarta 55281, Indonesia *fatikafanirahayu16[at]gmail.com b) Department of Chemistry Education, Faculty Mathematics and Natural Science, Universitas Negeri Yogyakarta Jl. Colombo No. 1, Karang Malang, Caturtunggal, Depok, Sleman, Daerah Istimewa Yogyakarta 55281, Indonesia Abstract This study aims to determine the quality of the analytical thinking ability instrument for the material of chemical equilibrium. The analytical thinking ability instrument is an instrument to determine the level of students^ analytical thinking skills which includes 20 items essay questions. Analytical thinking skills are viewed from three aspects, namely connecting, differentiating, and organizing. This study used a quantitative descriptive method with the following steps: (1) Examine aspects of analytical thinking skills in the material of chemical equilibrium, (2) Develop a test instrument design that refers to the aspects of analytical thinking skills, basic competencies, and competency achievement indexes, (3) Perform content and construct validation, and (4) Test the instrument in a limited scope. Data analysis using the Rasch model with the QUEST application. Data analysis result of this instrument trial on 85 students showed that there were 18 valid items and 2 invalid items, with a cronbach-alpha value of 0.71, which indicates that the questions are in the reliable category. Keywords: Validity, Reliability, Instruments, Analytical thinking skill, Chemical equilibrium Share Link | Plain Format | Corresponding Author (Fatika Fani Rahayu)

111	Chemistry Education	ABS-470
Development of Contextual Teaching Materials Based on the Project Based Learning model in the process of making Mg(OH)2 from seawater Geby Ayu Fadhilah (a*), Omay Sumarna (a), Sjaeful Anwar (a) a) Departemen Pendidikan Kimia, Universitas Pendidikan Indonesia, Jl. Dr. Setia Budhi No. 229, Bandung 40154, Indonesia *ayugeby[at]upi.edu Abstract Conventional learning which is one-way process and the insufficient availability of contextual teaching materials makes chemistry difficult for students. One of the contexts in society that can be used as material in chemistry learning is the manufacture of Mg(OH)2 from seawater. Seawater is sustainable and it is potential source to produce the compounds of Mg(OH)2 because the content of seawater Mg2+ is relatively high. Mg(OH)2 is a compound that plays an important role in human life, it can be used in various industrial fields, such as pharmaceutical field as the ingredients of material for making gastric medicine. That^s compounds used as antacids to neutralize stomach acid. This research aimed to produce contextual chemistry teaching materials in learning using a project-based learning model in the process of making Mg(OH)2 from seawater. The research used R & D (Research and Development) method with 4D teaching material development model that is modified into 3D (define, design, develop). The research instruments used a validated questionnaire and observation sheet. The results of the validation of teaching materials which include four aspects, they are- the feasibility of the material, content, language, and graphics show a CVI of 0.95. The valid categories are found in all of criteria such as content, language, and content aspects, on the other hand the invalid category are founded in one of the five criteria in the material aspect with a CVR value of 0.34, namely the content criteria for cognitive, psychomotor, and affective aspects of the material presented. It can be concluded that the application of teaching materials in learning can be done after correcting invalid criteria. Keywords: Seawater, Mg(OH)2, contextual teaching materials, sustainability, project based learning Share Link | Plain Format | Corresponding Author (Geby Ayu Fadhilah)

112	Chemistry Education	ABS-218
Perceptions of pre service teacher of online learning during the COVID19 pandemic: a case chemistry learning Yudha Febriyanto (a*), Jaslin Ikhsan (b) Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta Abstract This study aims to analyze the perceptions of pre-service teachers of online learning (elearning) during the pandemic. This research uses descriptive quantitative. The sample consisted of 175 pre service teachers in Riau province who were selected using purposive technique sampling. Data were collected using a questionnaire via google form. The data analysis was performed in quantitative percentages. The result of analysis shows that pre service teachers have a negative perception about online learning (elearning). They prefer face-to-face learning to online learning. Keywords: Pre service teacher- Online learning- Perception- Chemistry education Share Link | Plain Format | Corresponding Author (Yudha Febriyanto)

113	Chemistry Education	ABS-479
Exploration of mental models of high school students on acid-base theory material Dwi Novita Putri (a) , Antuni Wiyarsi (b) (a) Master of Chemistry Education Study Program, Faculty Mathematics and Natural Science, Universitas Negeri Yogyakarta, Indonesia dwinovita.2019[at]student.uny.ac.id (b) Chemistry Education Department, Faculty Mathematics and Natural Science, Universitas Negeri Yogyakarta, Indonesia Abstract This study aimed to explore students^ mental models of acid-base theory (Arhenius, Brønsted-Lowry, and Lewis). This research was conducted in semester of the 2020/2021 academic school year. Qualitative research with phenomenology involved 25 students of class XI as participants. The technique of collecting data with a depth interview was guided by 10 questions in an open-ended question. Content analysis techniques with interpretive or inductive coding were used to analyze the data that ended with an FGD. The results showed that the students had five classifications of mental models regarding the sub-concept of acid-base theory, namely the True Scientific Mental Model (MMBI)- Partially Correct Mental Model (MMBS)- Mixed Mental Model (MMC)- Primitive Mental Model (MMP)- and the Unexplored Mental Model (MMTT). Many students use primitive concepts in representing the concept of a reaction equation based on the Brønsted-Lowry theory. The factors that cause students difficulty in representing the concept are a) half-hearted understanding- b) tend to memorize material- and c) misconceptions originating from the wrongful arrest of participants. This has implications for the importance of an active chemistry learning system that trains students to think scientifically. Keywords: Mental model, acid-base concepts Share Link | Plain Format | Corresponding Author (Dwi Novita Putri)

114	Chemistry Education	ABS-483
The Effect of POGIL (Process Oriented Guided Inquiry Learning) Learning Model on Students^ Concept Mastery on Colloid Material Ivi Nurafiah (a*), Wiji (a), Sri Mulyani (a) a) Departemen Pendidikan Kimia, Universitas Pendidikan Indonesia, Jl. Dr. Setabudhi No. 229, Bandung, 40154, Indonesia *ivinurafiah[at]upi.edu Abstract POGIL is a student-centered technique, POGIL exercises are carefully designed to facilitate students in exploration, whether it is a picture, diagram, a set of chemical structures, a table, or something specific. POGIL offers a way for teachers to assist students as they develop accurately mental images of abstract chemical phenomena. POGIL also helps students to link their understanding of macroscopic and submicroscopic chemical phenomena to their symbolic representations. Colloids are the dispersion of particles from one substance (dispersed phase) across a dispersing medium made of other materials. The colloidal properties of the engineered nanoparticles directly influence their use in a variety of applications and also control the fate and mobility of their environment. The sand particles are first suspended but then gradually settle at the bottom, this is an example of a heterogeneous mixture. The purpose of this study is to improve students^ mastery of concepts by following a 3-phase learning cycle, logically developing students through exploration, concept discovery, and application. The method used in this research is to collect various relevant articles. The data were collected through observation, interviews, and questionnaires taken from several relevant articles. The results showed that the effect of the POGIL learning model on students^ mastery of concepts showed a significant increase. Keywords: colloid, abstract chemistry, mastery of concepts, POGIL (process-oriented guided-inquiry learning). Share Link | Plain Format | Corresponding Author (Ivi Nurafiah)

115	Chemistry Education	ABS-231
Application of The Edutok Method (Education By Tiktok) in Osmosis Pressure Learning Ani Dahliana (a*), Sari (b), Cucu Zenab Subarkah (b) a) Chemistry Education, Islamic University of Sunan Gunung Djati Bandung Jalan A.H. Nasution 105, Bandung 40614, Indonesia *anidahliana99[at]gmail.com b) Chemistry Education, Islamic University of Sunan Gunung Djati Bandung Jalan A.H. Nasution 105, Bandung 40614, Indonesia Abstract The purpose of this research for describing student performance learning of osmosis pressure material by online learning assisted by social media in TikTok Apps hereinafter referred to as the EduTok method (Education by TikTok). The method of this research use pre-experiment with the research design of the One-Shot Case Study. The method of this research use pre-experiment with the research design of the One-Shot Case Study. The subject of this research is 39 students of Chemistry Education Study students 3rd semester in the Capita Selecta Chemistry 1 course. Data were collected by instrument using performance sheets. The result shows that learning activities at the pre-virtual class meet session, students make a resume of material from the learning video. In the virtual meet class, students conduct discussions and work on practice questions. Students design the EduTok video project at the out-of virtual class meet session. The proportion of student performance in the pre-class virtual meeting session was 88%, the virtual class meeting session was 100%, while out-of virtual class meeting was 98% so that the average proportion of student performance, in general, was 95% classified as a very good category. Thus, the EduTok Method can be used in learning chemistry online and can measure student performance. Keywords: Osmosis Pressure- TikTok- Chemistry Learning Share Link | Plain Format | Corresponding Author (Ani Dahliana)

116	Chemistry Education	ABS-247
E-Module Teaching Materials Innovation Oriented Lesson Study in Learning Mol Concepts Doli Fadly Harahap(a*), Prof. Dr. Retno Dwi Suyanti, M.Si (b), Dr. Ayi Dermana, M.Si (b) a) students in master of chemistry education, post graduate program, universitas negeri medan, jl. willem Iskandar, medan 20221 b) Lecturer in Master of Chemistry Education, Postgraduate Program, Universitas Negeri Medan, medan, Indonesia Abstract During the Covid-19 pandemic, the learning process must continue as it should be in accordance with the 2013 curriculum that the teaching and learning process is student-centered via the internet network. For this reason, teaching materials are needed that are in accordance with current conditions that can make it easier for students to understand online learning. This study aims to analyze the teaching materials used in chemistry learning in the mole concept material, whether it is feasible and can be used at this time. The results obtained are an initial description of existing teaching materials for further development into innovative chemical teaching material products in the form of e-modules based on the 2013 curriculum. The research method uses Development Research with the stages of Analysis, Design, Development, Implementation and Evaluation (ADDIE). The research instrument was a feasibility questionnaire for teaching materials. The feasibility of using chemical teaching materials was analyzed based on the feasibility of content data, language feasibility, presentation feasibility and graphic feasibility. The results of the analysis of the teaching materials used are overall feasible but difficult for students to use to support the learning process online, so it is necessary to develop electronic teaching materials, more innovative e-modules Keywords: e-modules, ADDIE, lesson study Share Link | Plain Format | Corresponding Author (doli fadly harahap)

117	Chemistry Education	ABS-504
Students^ concepts mastery at electrolyte and non electrolyte solution for developing with intertextual learning strategies based on guided inquiry : A review Raissa Elvia Dini (a*), Sri Mulyani(a), Tuszie Widhiyanti (a) a) Departemen Pendidikan Kimia, Universitas Pendidikan Indonesia,, Bandung, Indonesia *raissaelviadini[at]upi.edu Abstract The concept mastery of chemistry is closely related to the existence of multirepresentations which are also called chemical triplets. The three level of chemical reprenstations, namely macroscopic, submicroscopic and symbolic. Abstract chemical concepts are still a difficulty faced by students in the learning process. Hence, gaps in learning outcomes occur due to a lack of multirepresented chemical knowledge and low mastery of concepts that must be considered. Particularly on the concept which is related to submicroscopic which involves good imagination and visualization skills. This article was compiled with a literature review design, which was collected from articles published in 2010 until 2020. Based on the article, it was found that intertextual is a learning that can connect the three levels of chemical representation as a whole and improve concept mastery and other skills. Suggestions for further research are to reveal the mastery of chemistry concept, espessially for representation of submicroscopic level. Keywords: multirepresentation, intertextual, mastery of concepts, submicroscopic, electrolytes Share Link | Plain Format | Corresponding Author (Raissa Elvia Dini)

118	Computer Science	ABS-520
Index Suggestion based on Log Analysis Widya Wilhelmina Simbolon (a*), Sonya Ahnela Pardosi (b), Elisabeth Jesica Gurning (b) a) Information System, Del Institute of Technology Sitoluama, Lagu Boti, Kabupaten Toba Samosir, Sumatera Utara 22381, Indonesia *widyawilhelmina[at]gmail.com b) Information System, Del Institute of Technology Sitoluama, Lagu Boti, Kabupaten Toba Samosir, Sumatera Utara 22381, Indonesia Abstract SELECT operations are the most frequent operations in the database. This operation performs a scan on the table to find the record corresponding to the executed query. Optimization of queries with indexing can enhance the record search process by forming a data structure to find one or a group of records efficiently without having to scan all records in the table. The analysis of log file queries on the database is one of the ways to define the records that need to be indexed. This is because a log query records all the queries executed in the database. In this research, the query log file need to be parsed to find statistical information access to the attributes in the database. Then, the statistical information will be used in forecasting process to estimate the growth of access on that attribute. The forecasting method used in this research is Support Vector Regression (SVR). The SVR method with the RBF (Radial Basis Function) kernel can provide indexing suggestions based on the statistical information of each attribute obtained from the query log file. From the results of the index suggestion development, the parsing process takes a long time to produce the necessary statistical information. Keywords: Database- Indexing- Log File- Forecasting- SVR. Share Link | Plain Format | Corresponding Author (Widya Wilhelmina Simbolon)

119	Computer Science	ABS-521
Binary Obfuscator Development Sarah Rosdiana Tambunan (a), Tennov Simanjuntak (b*), Ariansyah Nugroho (b), Naomi Nainggolan (b) Del Institute of Technology St. P.I. Del, Sitoluama, Lagu Boti, Kabupaten Toba Samosir, Sumatera Utara 22381, Indonesia sarah.tambunan[at]del.ac.id Abstract Many companies indicate that their system had been successfully modified by irresponsible people. That because the source code on the system was readable. This research would develop a Binary Obfuscator tool that could be secure the source code using obfuscation techniques. Obfuscation is a technique to transform a program code into different forms but has the same meaning. Several methods could be used to make an obfuscator, namely polymorphism, metamorphism, and packing. The binary obfuscator only works on portable executable files with the packing method uses the symmetric AES algorithm to change all sections in a portable executable file. The binary Obfuscator will be run in three processes namely Packing Process, Unpacking Process, and Hollowing Process. The Packing process is used to encode the executable file by modifying the algorithm, the Unpacking Process is used to decode the executable file so that it can be run normally. The Hollowing Process is used to inject executable files resulted from Obfuscator to the host process. With this binary obfuscator, an application will be more secure and avoid reverse engineering. Keywords: Obfuscation- executable file- packing Share Link | Plain Format | Corresponding Author (Sarah Rosdiana Tambunan)

120	Computer Science	ABS-278
Seismic Exposure on Human Settlements- Case Study: West Bandung Regency A Fakhrurrozi1*, A M Sari1, D Sarah1, B Setiadi1, M R Daryono1, A J Syahbana1,2, R A Bakar3, and J C Lee4 1Pusat Penelitian Geoteknologi, Lembaga Ilmu Pengetahuan Indonesia LIPI, Bandung, Indonesia 2Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung ITB, Bandung, Indonesia 3Universiti Kebangsaan Malaysia UKM, Kuala Lumpur, Malaysia 4Institute of Earth Science, Academia Sinica, Taipei, Taiwan Abstract An important key to determine the disaster risk is exposure. It is truly dynamic in space and time due to the expansion and change of the settlements. A seismic hazard is an earthquake disaster that able to deliver damage to the physical environments. Hence, it required to analyse the objects exposed by an active earthquake source in the Bandung Basin. The exposed objects that experience the most impact due to the shock of the earthquake are residential buildings. The West Bandung Regency was opted as our study area due to the high-risk zone for earthquake waves based on the calculation of seismic hazard. This paper tried to analyse the seismic exposure as the impact of earthquake waves around the Bandung Basin on residential housing in the West Bandung Regency using a geospatial analytics approach. The result shows that the settlements areas that heavily prune to earthquake shocks are located in the Tanjung Jaya. The Tanjung Jaya area has a high population density. Due to this, the appropriate disaster risk reduction mitigation strategies can be achieved. Keywords: Seismic exposure, human settlement, geospatial analytics, disaster risk reduction. Share Link | Plain Format | Corresponding Author (Afnindar Fakhrurrozi)

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