Development Electronic Student Worksheet based on Relating, Experiencing, Applying, Cooperating, and Transferring (REACT) in Introduction to Chemistry and Laboratory

This research aims to development a REACT-based e-worksheet that is feasible to use to stimulate the critical thinking, creativity, collaboration, communication (4C) skills and determine student response. The challenges of a dynamic era require students to have a 4C skills set critical thinking and problem-solving skills; creativity and innovation; communication; and collaboration. One of the tools that can be used in online learning to achieve this goal is to use the electronic Student Worksheet (E-Worksheet) which includes the student's 4C skill values with REACT strategies: Relating, Experiencing, Applying, Cooperating, and Transferring. The research chooses one of the topics in chemistry, which is introduction to chemistry and laboratories. This REACT-based e-worksheet was developed using the ADDIE development model which consists of five stages those are analysis, design, development, implementation, and evaluation. In addition, the study used a sample of 10 students of mathematic and natural science 12th grade MAN 4 Tangerang. Based on the results of validation and student response questionnaires, REACT-based e-worksheet to stimulate students' 4C skills was declared valid and obtained an average percentage of 91.8% with very good criteria.

Exploring Scientific Literacy of Chemistry Education Pre-Service Teachers Through Socio-Scientific Issues Approach

Scientific literacy is an ability that must be had by pre-service teachers. This research aimed to find out the scientific literacy's ability of pre-service teachers in chemistry education. This research was descriptive with quantitative approach. Participants were taken by simple random sampling techniques, the participants are chemistry education students. The data source comes from scientific literacy tests with socio-scientific issues and open-ended question description tests. The validity of the data was tested using a data triangulation technique, in which researchers compare data obtained through test instruments and interview results. The results of the data analysis showed the scientific literacy of chemistry education students was dominant in the nominal and functional categories with a percentage of 33.2% and 24.2%, conceptual and multidimensional categories 13.7%; 4.4%; and 24.5% of students did not give answers the tests.

The Effectiveness of E-Module on Buffer Solutions to Improve Students' Higher-Order Thinking Skills and Self-Regulated Learning

This study aims to determine the difference between Higher Order Thinking Skills (HOTS) and Students Self Regulated Learning (SRL) before and after using e-module based on the 7E (elicit, engage, explore, explain, elaborate, evaluate, and extend) learning cycle on the buffer solution material, and to determine the percentage of its effectiveness. The research use a quasi experiment with one-group pretest-posttest design. The subjects of this research were students of natural science 11th grade in one of senior high schools in Yogyakarta. The instrument used were test in the form of HOTS pretest-posttest description question and non-test in the form of self-regulated learning questionnaire. The data analysis technique used is Hotteling's T2 test. The results showed that the significance value was 0.000 < = 0.05, then H0 was rejected. There were differences in students' HOTS and SRL before and after using e-module based on the 7E learning cycle. The effectiveness of using e-module show by HOTS and SRL simultaneously (36.8%), HOTS (25.2%), and SRL (20.5%).

Development of Integrated Assessment Instrument to Measure Critical Thinking Skills and Self-Efficiency in Acid-Base Concept

The purpose of this research is to describe the stages of developing and validating a product which includes content validity and constructs validity. The method used is Research and Development (R&D) with define, design, develop, and disseminate (4D) model. The initial product was validated by material and learning evaluation expert lecturer. The suitability of the items evaluated by chemistry teacher based on indicators of competency achievement. The sample selection was determined by stratified random sampling of 170 students of 11th grade senior high school in Yogyakarta City. Content validity was analyzed using Aiken's V formula. The results of data analysis show that all components of the test instrument are valid with Aiken's V value greater than 0.80 with a significance of 0.05. Verification of construct validity was analyzed using exploratory factor analysis with the help of the SPSS version 21.0 program. The results prove that all components in the integrated assessment instrument are suitable to be used to measure the critical thinking skills and self-efficacy of students on acid-base concept.

Development of Inorganic Molecular Shape Model Using 3D Printer to Strengthen Student's Conceptual Understanding

This research aims to develop a product in the form of an inorganic molecular shape model using a 3D printer, analyze the validity, practicality, effectiveness of the product, and strengthen students' conceptual understanding using the product. The method is Research and Development (R&D) based on the Analysis, Design, Development, Implementation and Evaluation (ADDIE) model. The supporting instruments for this research are product and instrument validation sheets, product readability questionnaires, pretest-posttest questions, question during the trial, observation sheets for students' conceptual understanding, and student response questionnaire to the product. The results showed that the product developed was following the ADDIE model because the five stages were carried out systematically; the product being developed has very high validity with an average percentage of 96.88%; the average percentage of practicality is 95.17% which is categorized as very practical, and the average percentage of effectiveness is 94.69% which is categorized as very effective; the product developed can strengthen students' conceptual understanding shown on the average percentage of conceptual understanding indicators achievement during the trial was 90.61% and the observation result was 94.69%, both of which belong to very high category. There was an increase in the average pretest value of 33.93 and post-test of 63.99. The results of the Rasch analysis after using this product showed that the consistency of students' answers was 0.71 (quite good), the quality of the items was 0.93 (very good), and the interaction between the consistency of students' answers was 0.68 (quite good). The product can be used to strengthen students' conceptual understanding on the topic of molecular shape.

Development of Interactive E-Module on Oxidation-Reduction Concept

This research aims to develop an interactive e-module on redox concept. Research and Development (R&D) method was used in this study with a Plomp model. This model included three phases: preliminary, prototype or development, and assessment. Validation sheets and response questionnaires were used as research instruments. Six expert lecturers, consisting of three media and materials experts each, assessed the validity sheets. A small-scale test was carried out utilizing two approaches; a one-to-one test and a small group test. A one-to-one test was given to three students who had high, medium, and low abilities; while the small group test was conducted on three teachers and 30 students from three different schools, which are MAN 2 Pekanbaru, MAN 1 Pekanbaru, and SMA IT Al-fitiyah. The results showed that the interactive e-module was very valid and could be used in learning activities. This is indicated by the percentage of validation from material experts 89.27% and media experts 88.76%. In a small-scale trial for a one-on-one test, the teacher's response 95.83% with very practical criteria; and student response test 87.73% with interesting criteria.

Needs Analysis: Development of Web-Based Learning Media on Chemical Bond Concepts

The study aims to explain the need for developing web-based learning media on chemical bonding concepts. This research is descriptive research with a survey method. The sample of this research is the teacher of chemistry subject who teaches chemical bonding concepts at Senior High School in Langsa city. Data collection techniques using questionnaires, interviews, and documentation. The data collected is data on needs on aspects of teacher readiness, student needs, and support. Data analysis uses descriptive qualitative and quantitative descriptive analysis techniques. The results showed that teachers of chemistry subjects at Senior High School in Langsa City had the readiness to use web-based learning media that would be developed. Based on the teacher's response, the development of web-based learning media on chemical bonding material is strongly needed by teachers and students. The support of facilities and human resources at Senior High School in Langsa City on web-based learning media apply is adequate. These results concluded that the development of web-based learning media on chemical bonding material is strongly needed in chemistry lessons at senior high school in Langsa city.

Implementation of Problem-based Learning Model to Enhance Students Learning Outcomes in Buffer Solutions Topic

This research aims to determine the improvement of the process and learning outcomes of the buffer solutions topic by applying the Problem-based Learning (PBL) model. This research is based on Classroom Action Research (CAR) takes place in two cycles, with several stages including planning, implementing, observing, and reflecting. Our present study used 17 students of natural science 11th grade SMA Advent Manokwari. The data was obtained from teachers and students. The data collection method used cognitive learning outcomes and observation. The data analysis uses descriptive analytic techniques. Our findings showed that the application of the PBL model can improve the quality of the learning process on the buffer solutions topic; the application of the Problem-based Learning (PBL) learning model has increased from cycle I with an average grade of 65.36 and a percentage of passing grades of 41% and cycle II with an average grade of 83.66 and a percentage of passing grades of 88%.

PENGEMBANGAN E-LEARNING BERBASIS SCHOOLOGY PADA MATERI KESETIMBANGAN ION DAN pH LARUTAN PENYANGGA KELAS XI SMA/MA

This study aims to develop a Schoology-based e-learning media and to find out the validity and response of users (teachers and students). The method used in this research was Research and Development (R&D) with the Analysis, Design, Development, Implementation, and Evaluation (ADDIE) model. The implementation stage was not carried out due to the limitations of the research. Validation tests carried out by material and media experts as well as limited trials on students and teachers were obtained using a questionnaire. The data analysis technique used was descriptive analysis. The validation results from material and media expert showed the percentage of 93.23% and 90.69% in the valid category. The results of trial by student and teacher responses showed the percentage of 94.40% and 93.12% in good category. The Schoology-based e-learning media on ion equilibrium and buffer solutions is valid and suitable for use in online learning.