bluuebunny/crossref_metadata_2025_split huggingface dataset:
Examining Indonesian pre-service chemistry teachers’ views of nature of science and technology (VNOST)
Authors: Mustikasari D , Muzakir A , Yuliani G 
Published: May 2020

Abstract
This study aims to examine the views of the nature of science and technology (VNOST) of the pre-service chemistry teacher. The participants comprised 23 6th semester students at one of the state universities in Semarang, Indonesia. This study utilized a questionnaire and qualitative approach to gathering data. The NOST questionnaire consists of eight multiple-choice items, comprising of four aspects: definitions of science and technology, the epistemology, the internal sociology of science, and the external sociology of science. It was found that 78% of students had incomplete but legitimate views on the definition of science. They only viewed science as a study of principles, laws, and theories in biology, physics, and chemistry or body of knowledge without considering the scientific process behind it. Meanwhile, the remaining 22% consider science includes an investigative process and the process of resulting knowledge. Generally, the majority of the pre-service chemistry teachers still have lack comprehension of defining science and technology both epistemologically and sociologically. Thus, the results showed that pre-service chemistry teachers still need to improve their views of the nature of science and technology.
The application of scaffolding augmented reality (AR) media in the sharing task learning of electrolyte and non-electrolyte solutions
Authors: Nurrohmah S , Supriatna A , Fatimah S S , Setiaji B 
Published: May 2020

Abstract
This research is based on the difficulty of students in understanding the abstract concept of electrolyte and non-electrolyte solutions. The aim of this study is to evaluate the improvement of students’ understanding concepts with the scaffolding of augmented reality (AR) media in the sharing task learning of electrolyte and non-electrolyte solutions. This research was conducted at one of the high schools in Bandung, Indonesia. Data were obtained through questionare understanding the concept of electrolyte and non-electrolyte solutions and student’s worksheets. Data were analysed quantitatively and qualitatively. The results define students’ conceptual understanding from each question indicator obtaining positive results. It can be concluded that the application of scaffolding augmented reality (AR) media in the sharing task learning of electrolyte and non-electrolyte solutions enhances understanding of student’s concepts.
Pre-service chemistry teachers’ learning obstacles in understanding the relationship between the chemical structures and physicochemical properties of ionic liquids
Authors: Venessa D M , Hernani  , Halimatul H S 
Published: May 2020

Abstract
The purpose of this study was to determine the difficulties faced by pre-service chemistry teachers in correlating the structures with the physicochemical properties of ionic liquids. The descriptive research method used quantitative and qualitative approaches The participants in this study were 23 pre-service chemistry teachers from one of the universities in Indonesia. Data collected using an instrument in the form of a description test guided by the discourse on ionic liquid technology. In general, the results of the study indicate that more than half of the students have difficulties in applying chemical concepts related to the context of the relationship of structures with the physicochemical properties of ionic liquids. The result also reveals that the most dominant difficulty experienced by pre-service chemistry teachers is difficult to determine the right chemical concepts to explain the tendency of melting point differences of molten salt and ionic liquids. The results findings will be used as the basis for developing didactic designs that are oriented to resolve learning obstacles by pre-service chemistry teachers in understanding the relationship of structures with physicochemical properties of ionic liquids
Development of STEM-based practicum on making toothpaste from chicken eggs
Authors: Pratiwi D R , Sholihin H , Arifin M 
Published: May 2020

Abstract
One challenge in the science learning in industrial revolution 4.0 includes the development of a practical laboratory work that combines science, technology, engineering and through STEM-based learning. This study aims to develop a practical method based on STEM in the manufacture of toothpaste from the chicken in the egg shells as one example of colloid material. Eggshell was chosen because it is regarded as waste material that may create problems on its disposal. However, eggshell contained high amount of calcium, hence it may be utilized as starting material for toothpaste production. The research methods used Research and Development (R&D) comprised of the development of STEM-based worksheet and its validation by experts. Participants of this study were students of class XI, teacher and validator. Data collected included validator sheets and questionnaires responses. This research resulted in the design of a viable practical methods such as lesson plans and worksheets.
Analysis of Technological Pedagogical and Content Knowledge (TPACK) of Prospective Chemistry Teachers through Lesson Study
Authors: Paristiowati Maria , Yusmaniar  , Fazar Nurhadi M , Imansari Anisa 
Published: May 2020

Abstract
This study aims to analyze the profile of technological pedagogical and content knowledge (TPACK) for prospective chemistry teachers when taking teaching practice courses through Lesson Study activities. This research was conducted in the Chemistry Education Study Program of Jakarta State University and several schools in Jakarta. The method used in this study was a qualitative descriptive research method. The technique of collecting data results was conducted using TPACK questionnaires, lesson plan (RPP) assessment, content assessment, observation of the learning process, and reflective journal. The stages of research were in accordance to the modified Lesson Study stage, consisting of RPP preparation training that integrates TPACK components, implements RPP in learning, observes the learning process and reflects it. TPACK overview was obtained from the questionnaire. Observations showed that prospective chemistry teachers can make or use video, interactive power points in studying chemical balance and acid-base materials. Prospective chemistry teacher can also vary various methods such as demonstrations, discussions, games in the delivery of material and evaluating through online games. The result of the study indicated that the ability of TPACK from prospective chemistry teachers can be developed during the learning process from the perception levels to the Cn-Conception level category through lesson study.
Conception, threshold concept, and troublesome knowledge in redox reaction
Authors: Delisma D , Wiji  , Widhiyanti T 
Published: May 2020

Abstract
This study aims to analyze the conception, threshold concept, and troublesome knowledge in redox reactions. This research used a descriptive qualitative method which included analyzing several journal articles about conception and conducting interviews with five chemistry teachers to get information about threshold concepts and troublesome knowledge. Based on a journal analysis related to the conception for redox reactions, the majority of students correctly answered questions about the concept of defining oxidation numbers based on the binding and releasing of oxygen, determining reducing and oxidizing agents. Conversely, most students experienced misconceptions on the concepts of oxidation and electron transfer, such as in assuming the charge on polyatomic molecules and ions is an oxidation number, changes in ion charge and polyatomic molecules to identify the oxidation and reduction reaction species. Meanwhile, the threshold concept for redox reactions comprised of the symbol of elements, chemical formulas, nomenclature, chemical materials, the constituent particles, and electronegativity. Whereas troublesome knowledge for redox reactions included complexity in determining oxidation numbers, complexity in using definitions, and language use.
Investigating pre-service chemistry teachers’ view of the nature of science and technology for organic light-emitting diodes learning
Authors: Marsya R F , Mudzakir A , Khoerunnisa F 
Published: May 2020

Abstract
This study aims to investigate the pre-service chemistry teachers’ (PCTs’) views of the nature of science and technology (VNOST) for organic light-emitting diodes (OLED) learning. VNOST is used to explain the phenomena of science and technology, and to explore the relation of science, technology, and society. It was proposed that the investigation of teachers’ VNOST is critical to improve the effectivity of classroom learning. OLED technology is one of the newest technology that contained application of chemistry concepts and VNOST aspects, hence can be used in chemistry learning. The quantitative method was used in this study. The participants were 86 pre-service chemistry teachers (PCTs) at Universitas Negeri Padang (UNP) and Universitas Pendidikan Indonesia (UPI). The investigation of VNOST used a questionnaire from Aikenhead, consisted of eight questions. The PCTs’ VNOST was classified into three categories, namely: realistic (R), has merit (HM), and naïve (N). The results showed that there were many PCTs VNOST that categorized in HM and N categories. Identification of chemical concepts related to OLED suggested that OLED may be used in chemistry learning.
Identifying pre-service chemistry teachers’ view of the nature of science and technology’ for ionic liquids as cellulose solvent
Authors: Anggraini F , Mudzakir A , Halimatul H S 
Published: May 2020

Abstract
This research aims to indentify the views of pre-service chemistry teachers about the nature of science and technology. This research was conducted using descriptive methods with participants consisting of 28 students of the Universitas Lampung. Data was collected using a view of the nature of science and technology (VNOST) questionnaire consisting of 4 aspects: Definition of science and technology, Epistemology of science, Sociology of Internal science, and external sociology of science. The results of this study indicate that pre-service teachers define science as a concept and technology as a science application. In the epistemology of science, they view scientific models as genuine objects and there are many ways to calcify. In internal science sociology, scientific decisions are based on previous theories and technological decisions based on their impact on society. For external sociology of science, pre-service teachers who agree with science-technology-society influence and influence each other. In general, the results also revealed that most of them had a good view. The results of this research will be made didactic design in the context of ionic liquids as cellulose solvents to improve the ability of VNOST pre-service chemistry teacher.
Jambolan fruit peels (syzygium cumini l. skeels) as substitute for synthetic acid base indicators: implementation of the ESD concept
Authors: Stephanie M M , Moersilah  , Paristiowati M 
Published: May 2020

Abstract
Implementation of Education for Sustainable Development (ESD) can be done by implementing several strategies such as integrating the three pillars of ESD to learning material and adopting the principles of green chemistry in learning. In this study, the use of renewable materials with safe solvents to extract jambolan fruit peels as a substitute for synthetic indicators has been carried out. The results of measuring the absorbance value at wavelength 507-528 showed that the jambolan fruit peels was extracted optimally in the solvent mixture double distilled water : ethanol with a ratio of 1 : 2 at pH 2. Under these conditions, maceration was carried out 24 h three times and then evaporated and extracted using n-hexane and chloroform solvents. Extracts that have been tested under various pH, ranging from 1 to 14, and titration methods were then used in learning activities to determine the level of CH3COOH in food vinegar on the topic of acid-base titration. The data generated in this study indicates that the natural indicator of jambolan fruit peels can be used as a substitute for synthetic indicators. Its use in learning provides knowledge to students regarding the chemicals that are more economical and environmentally friendly and support implementation of ESD concept in school.
Empowering students’ engagement in organic chemistry learning through integration of dilemma stories with number head together
Authors: Istianah  , Rahmawati Y , Kurniadewi F 
Published: May 2020

Abstract
This paper portrays research into an innovative curriculum project of dilemma stories which was conducted at a secondary school in Jakarta, with 44 students of year 12. The research focused on the development and implications of a dilemma stories approach with the Numbered Heads Together method in Organic Chemistry learning. The dilemmas stories on the topics of formaldehida, alcoholic drinks, paracetamol drugs, and butter and margarine were developed in this research study. A qualitative approach was implemented with multiple methods including interviews, reflective journals, and classroom observations. Data analysis was conducted based on the themes found throughout the learning process. The results of the research showed the effects of this innovative approach on students’ development of higher order thinking skills, argumentation skills, collaboration skills, problem solving skills, personal values reflection, and responsibility. Students learnt to solve the dilemma problems in real situations which related to chemistry learning. The teacher became involved in this innovative approach for engaging students and improving their learning quality. In conclusion, the dilemmas stories approach has engaged the teacher and students in meaningful chemistry learning experiences.
Developing 22nd century skills through the integration of STEAM into smoke absorber project
Authors: Ridwan A , Rahmawati Y , Mardiah A , Rifai A 
Published: May 2020

Abstract
This study aimed to develop 22nd century skills through the integration of STEAM (Science, Technology, Engineering, Art, and Mathematics) project in chemistry learning. The study involved the thirty-three students of 11 year. The STEAM integration was implemented in the teaching of colloidal system through a project-based learning. The study employed qualitative approach to explore the integration of STEAM in chemistry and students’ 22nd century skills development. Data were collected through classroom observations, interviews, reflective journals, and chemistry concept test. Students designed an innovation project with the integration of STEAM in developing smoke absorber as the solution of the smoke pollution. The data were then analysed based on the themes pattern found in multiple data sources. It shows that STEAM improved students’ critical thinking, creativity, collaboration and communication skills, and caring of environmental problems (5C), in addition to information, media, and technology skills. However, this study remains challenging since STEAM integrated chemistry learning requires more empowering student, time resources, and learning contexts in order to explore and to raise the students’ environmental awareness.
Pre-service chemistry teachers’ conceptions of ionic liquids as ionic solvents on the cellulose dissolution process
Authors: Damayanti L A , Fatimah S S , Widhiyanti T 
Published: May 2020

Abstract
This study examines pre-service chemistry teachers’ understanding of concepts related to ionic liquids as cellulose solvents which include knowledge of cellulose, ionic compounds, and ionic liquids. This study used a descriptive method and involved 35 pre-service chemistry teachers from 6th semester who enrolled in the High School Chemistry unit. The research instruments of an open-ended questions which related to the concepts of ionic compounds, ionic liquids and cellulose. The results show that pre-service chemistry teachers have limited conceptions about of the concepts related to the dissolution of cellulose in ionic liquids. Based on the analysis of student answers to open-ended questions, students’ conceptions about definition of cellulose are quite good, but student have no sufficient knowledge about the structure and benefits of cellulose. Furthermore, students’ conceptions related to ionic compounds and ionic liquids are not good enough because student have not been able to mention the differences between ionic compounds and ionic liquids based on the structure, properties, and the constituent particles. This is because ionic liquids as cellulose solvents and the concepts related are not taught directly in the classroom so that it becomes an unfamiliar concept to student.
Students’ preconceptions of the context of magnetic media lubricants and the related chemical contents
Authors: Nurhadi A R , Hernani  , Musthapa I 
Published: May 2020

Abstract
This study aims to analyze students’ preconceptions regarding the context of magnetic media lubricants and chemical content related to the context, as the basis for didactic design development that can teach technological aspects in high school chemistry learning. Descriptive research methods are used in explaining the results of the research obtained. This study involved 40 students from one of the high schools in the city of Bandung. The preconception test questions are based on a magnetic media lubrication enrichment book that was previously developed by researchers, which contains the context of magnetic media lubricants with chemistry contents are transition metals, chemical bonds, and intermolecular forces. Student answers are analyzed using a frequency distribution to categorize the criteria of conceptual understanding of each question and the answers are analyzed for errors to show learning obstacles that might arise in learning. In general, the results show that students still have a limited understanding. Therefore, it is necessary for educators to develop a didactic design based on the findings of student learning obstacles so as to be able to integrate technology in science learning comprehensively and optimally.
Project based learning to develop student’s creativities and characters in designing experiments
Authors: Sari S , Rohmah S , Sobandi O , Nasrudin D 
Published: May 2020

Abstract
This study aims to analyze creativities and characters of students through project-based learning in designing experiments. Through the quasi-experimental method this research was conducted on 20 students who took experimental design courses. Through worksheets, product assessment sheets and attitude observation sheets the creativities and characters of students can be analyzed. The results showed that students creativities in making experimental designs in the form of flowcharts, to present, to create storyboards, to develop products from designing experiments had an average of 77.3, with good category. Meanwhile the characters developed were discipline with observable behavior that always came to the class punctually, spoke honestly, and remained confident even though the task that was doing was not satisfactory, the characters of responsibility with observable behavior was able to do the task without the help of others and diligently working on the task until it was finished.
Ethnoscience knowledge of indigenous community in Sigi District-Central Sulawesi
Authors: Ningsih P , Hamzah B , Said I 
Published: May 2020

Abstract
This study aimed to find out how the understanding of indigenous community in Sigi district (Ongulero and Wiapore villages) that related to ethnoscience knowledge and its application in the daily lives. This study was a descriptive qualitative study using interview and documentation methods. Based on the results of the research, it was obtained that the indigenous community in Sigi district has the scientific knowledge that related to food and the processing, agriculture, and treatment for some diseases (medicines).
Students’ critical thinking skills comparison in discovery learning based on constructing concept mapping and mind mapping
Authors: Suardana I N , Redhana I W , Yunithasari N P M 
Published: May 2020

AbstractThis research focused at analyzing the differences of students’critical thinking skills who learned Basic Chemistry II via discovery learning based on constructing concept mapping and based on mind mapping. This quasi-experimental research used non-equivalent pre-test post-test control group design. The subject was students in Science Education Study Program, the Ganesha University of Education on 2ndsemester, consists of 34 students who were divided equally into two groups (A and B). Class A and class B correspond to a group who learned Basic Chemistry II through discovery learning based on concept mapping and mind mapping construction, respectively. A test was conducted to examined students’ critical thinking skills. The results demonstrated that there is no significant differences in critical thinking skills of both groups. However, there are differences in their indicators i.e. interpretation, analysis, evaluation, inference, and explanation indicators.
The influence of mobile–NOS model on students understanding on Nature of Science (NOS) and scientific literacy
Authors: Khery Y , Nufida B A , Suryati  
Published: May 2020

Abstract
The aim of this research was to evaluate the influence of mobile-NOS model of learning on students’ understanding of Nature of Science (NOS) and scientific literacy on general chemistry course. The method employed in this research was quasi-experimental method carried out by post-test only control group design. The research subjects were 75 students participating in the General Chemistry course for the academic year of 2018-2019 selected by the saturated sampling method. Subjects were distributed into two groups, which were experiment and control groups. The experimental group was subjected to Mobile - NOS Model of Learning and the control group to NOS Oriented Learning. Data were collected by analysing the NOS questionnaire and scientific literacy test results. Data was analysed by independent samples t test. Research result showed that there are influence of Mobile - NOS Model of Learning to Students Understanding of Nature of Science (NOS) and Scientific Literacy.
Students’ mental models in acid-base topic
Authors: Redhana I W , Sudria I B , Suardana I N , Suja I W , Putriani V D 
Published: May 2020

Abstract
This study aims to describe the profiles of students’ mental models of SMA Negeri 1 Singaraja on the topic of acid-base. The study was a survey research. The population consisted of 279 people of the eleventh-grade students of Mathematics and Natural Sciences Classes of SMA Negeri 1 Singaraja in Buleleng Bali Indonesia in a school year of 2018/2019. In this study, all members of the population became members of the samples. The data needed in this study were the student’s mental model scores. Data were collected by a diagnostic test. Data were analyzed descriptively by grouping students’ mental models into three types, including scientific, synthetic, and initial mental models. The results showed that students had scientific, synthetic, and initial mental models of 2.69%, 61.766%, and 35.56% respectively.