83 research outputs found
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DEVELOPMENT OF LEARNING MEDIA BASED ON ANIMATION VIDEO IN LEARNING HYDROCARBON MATERIAL AT GRADE XI SENIOR HIGH SCHOOL
Full text linkThe impact of technological developments in education on learning process is significant. To be effective and efficient, the learning process must be developed, implemented, analyzed, and monitored. There are several students find it difficult to understand the terms, theories, and structures of carbon chain structures until they make an error; students mark in hydrocarbon quiz, with 0% student that have mark up from 61 to 100. Majority of student have mark in range 31 to 40 (39%) and least in range 51 to 60 at 4%. Teaching the structure of the carbon chain requires clear visualization, which would be helped by the teacher's exposure. It needs a proper media for teaching and visualizing how the chain's structure are. This research uses the ADDIE development model. This research begins by analyzing the problems and limitations faced in learning chemistry. The quality of animated video learning media with an assessment percentage of 84% by media experts, 91% by material experts. Based on the results of a questionnaire for 30 students, the percentage of assessment based on responses was 91% in the very good category. Based on test results on 30 students, with tcountgreater than ttable; 22.75166617 greater than 2.045 with the Ha hypothesis accepted. Class XI SMA Class XI Animation Based Learning Videos are declared valid based on expert and practitioner assessments. The results of the experts' assessments consistently categorize the animated videos being developed. The general assessment of this video is very good and usable
ANALYSIS OF THE IMPLEMENTATION OF STEM-BASED MODULES ON PERCEPTIONS OF TEACHER AND STUDENT READINESS DURING THE INDEPENDENT CURRICULUM PERIOD (a Case study at High School No. 2 Kesuma Bangsa)
Full text linkThis research aims to determine the readiness of teachers and students in the implementation of STEM-based modules for class X SMA Negeri 2 Kesuma Bangsa in chemistry subjects. The type of research used is qualitative descriptive research. The population in This research is all class X students at SMA Negeri 2 Kesuma Bangsa, while the sampling technique in this research is saturated sampling. Study This will be implemented in the odd semester of the 2023/2024 academic year. Data collection techniques are in the form of interviews, observations, questionnaires, and documentation. Data analysis determines the level of teacher readiness and student learning readiness in following the chemistry learning process by implementing STEM-based modules and calculating percentage values. The questionnaire then describes the results of the interviews and observations that have been carried out. The results showed that the class X chemistry teacher at SMA Negeri 2 Kesuma Bangsa is ready to teach by obtaining an average score of 95.49, included in the very good category; this is proven by the results of the interviews showing that teachers are capable of developing curriculum and competency standards graduates, and development of learning tools. Class X students' learning readiness in SMA Negeri 2 Kesuma Bangsa obtained an average score of 81.12, included in the very good category. This is proven by observation results, showing that students are ready based on physical, psychological, and material readiness indicators. It can be concluded that the readiness of chemistry teachers and class X students of SMA Negeri 2 Kesuma Bangsa are ready to implement STEM-based modules
PROCESSING AND CHARACTERIZATION OF OIL PALM LOOSE FRUITS AS A RAW MATERIAL FOR BIODIESEL
Full text linkThe main product of oil palm plantations is oil palm fresh fruit bunches, however there is oil palm loose fruits which is detached from the ripe fresh fruit bunch or found during the process of cutting at harvest. Biodiesel could be obtained by processing crude palm oil (CPO) with trans-esterification process, however CPO is an important source of food, especially for cooking oil. Biodiesel production as a source of new renewable energy increases, hence it could threat the food security programs. The oil palm loose fruits as an industrial waste were investigated for renewable energy sources to overcome the conflict between the renewable energy program and food security. This research found that oil palm loose fruits consisted about 55% of mesocarp (flesh of fruit) and around 45% of the seed. Increasing delay on processing of oil palm loose fruits led to decreasing of the oil, and processing delay for 12 days resulted in a significant reduction extract yield. Increasing processing delay reduced the iodine value and the study showed that oil palm loose fruits after 12 days have a high level of oil saturation and free fatty acid of CPO was 37%. Esterification followed by transesterification was conducted to synthesis biodiesel. The biodiesel was obtained with yield of 14.5%, and free fatty acid of 1.3%, while fatty acid methyl ester was achieved 70.24%. Hence, we could convert oil palm loose fruits into biodiesel as a strategy to meet the renewable energy requirement produced from non-food crop
DESCRIPTION OF STUDENTS' MENTAL MODELS ON BUFFER SOLUTION MATERIALS USING FOUR-TIER DIAGNOSTIC TESTS
Full text linkMental models are very important to know because they can describe the level of students' understanding of chemical phenomena related to certain materials, one of which is a buffer solution that emphasizes the interconnection understanding of the three levels of chemical representation. This study aims to describe the mental model of students in buffer solution materials. The research method used is quantitative descriptive. The sampling technique was purposive sampling, with a sample of 35 students. The research instruments used were a four-tier multiple choice diagnostic test based on mulltire, chemical presentations, and interviews.The results showed that the mental models of students on the buffer solution material were diverse, namely: Scientific Model with a percentage of 18.05%, Synthesis-Partial Understanding A of 5.35%, Synthesis-Partial Understanding B of 32.34%, Synthesis-Misconception of 26.27%, and Initial Model of 21.54%. The percentage of agreement between the test answers and the interview answers was 75% which showed that the answers given in the test and the interview were correct from the students' own understanding
ANALYSIS OF STUDENTS CHEMICAL BONDING MISCONCEPTIONS USING TWO-TIER DIAGNOSTIC TEST
Full text linkThis study aims to identify the misconceptions of 10th-grade students of a Senior High School (SMA N 1) Ciawi Bogor on chemical bonding by using a two-tier diagnostic test consisting of nine questions. The research method that was carried out was quantitative research with adescriptive approach. The participants of this study were classes X-2, X-4, and X-8 of SMAN 1 Ciawi in the academic year 2023/2024, with a total sample of 96 students taken from three classes using purposive sampling. Moderate misconceptions concerning ionic bonding have been discovered in the responses provided by the students for questions 1 and 2, with percentages of 37.50 and 34.38%, respectively. In Question 3, which covered lattice and intermolecular forces on silicon carbide, misconceptions among students were found to be 72.92%, indicating a high level of misconception. The percentage of students experiencing misconceptions about ionic bonding in question 4 (58.33%) was considered moderate. Students' misconceptions about bonding and intermolecular forces on magnesium oxide were determined to be relatively low, at 30.21%. Students who experienced misconceptions about the conductivity of graphite (Question 6) were 43.75%, which can be categorized as moderate misconceptions. In Question 7 about sulfur, student misconceptions were observed at 15.63%, but there were 47.92% who did not have prior knowledge about sulfur as a simple molecular compound. When asked about the differences in intermolecular forces on water and hydrogen sulfide, the percentage of students who had misconceptions was observed at 50.00%, then on the concept of lattice and intermolecular forces on macromolecules at 25.00%. These results are also influenced by students' prior knowledge of macromolecules, which is quite limited. Teachers and educators can employ some potential futuristic instructional methods to help students understand chemical bonding more efficiently, such as implementing VR and AR simulations, integration of gamification and game-based learning, andvirtual field trips and interactive demonstrations
THE DEVELOPMENT OF INNOVATIVE LEARNING MATERIAL WITH A PROJECT TO IMPROVE STUDENT'S CRITICAL THINKING SKILLS IN THE TEACHING OF REDOX TITRATION
Full text linkSelf-directed learning has become popular in higher education worldwide in recent years. As a result, students may have difficulty understanding higher education standards. Therefore, innovative learning materials that are relevant and easy to understand by students and provide opportunities for developing student's character so that they are competent in developing their knowledge capacity independently through high-level thinking skills such as critical thinking. Through the research and development method using the ADDIE Model, teaching materials are created by integrating the PjBL learning model to measure product feasibility scores, students' critical thinking abilities, and know student responses and learning outcomes. Based on the validation results, the average value of the validation results obtained was 89% (valid). After testing the product, it was discovered that the student response was 87.68% (good), the average critical thinking ability score was 87.36, indicating an increase and the average learning outcomes obtained by students were from 56.80 to 87.38, indicating an increase. Overall, the integrated teaching materials for the PjBL learning model on Redox Titration material are suitable
FUZZY DELPHI METHOD FOR DESIGNING AND DEVELOPING ACID BASE Et-PBL MODULE TO IMPROVE PROBLEM-SOLVING SKILLS
Full text linkInnovative and creative techniques and materials for teaching and learning are required to stay up with the advancements of globalization. The purpose of this study is to reach expert consensus on the precise and relevant components that should be used while designing and developing an acid-base Et-PBL module to improve problem-solving skills.This study's design is quantitative and employs the Fuzzy Delphi method.Thirty-three items made up the questionnaire instrument used to gather research data. Twelve experts from 10 different colleges who specialize in chemistry education and Islamic education participated in the study.Based on the expert consensus value over 75%, the fuzzy score (A) - cut value = 0.5, and the threshold value (d) 0.2, the data analysis results indicated that the experts accepted all these items. Consequently, it demonstrates that these components have been agreed upon by experts and are required for the design and development of the acid-based Et-PBL modul
THE INFLUENCE OF THE PROJECT-BASED LEARNING MODEL ON STUDENT LEARNING OUTCOMES ON THE ACID-BASE CONCEPT (A Case study at Senior High School No. 2 Medan)
Full text linkThe research aims to determine the effect of the project-based learning model on learning outcomes and students' responses to acid-base material. Based on observations and interviews with students and teachers, the background of this study is that chemistry education remains teacher-centered and lacks practical activities, partly due to the COVID-19 pandemic. It is hoped that this model will engage students more actively in the learning process and improve their learning outcomes. This experimental research employs a pretest-posttest control group design. The research samples were students from class XI IPA 2, who experienced the project-based learning model (experimental class), and class XI IPA 1, who followed the conventional model (control class). The instruments used in this study were tests to measure student learning outcomes and questionnaires to assess student responses to the implemented learning model. The normality test results showed a significant value of 7 for both the experimental and control classes at an alpha level of 0.05. The homogeneity test indicated a value of 1.08 at an alpha level of 0.05, suggesting the data are normally distributed and have homogeneous variance. The results of the right-sided t-test showed a significant value of 7.35, which is greater than the critical value of 1.669, indicating that t_count is greater than t_table, leading to the rejection of the null hypothesis (H0) and the acceptance of the alternative hypothesis (Ha)
DEVELOPMENT OF TEACHING MATERIALS TO SUPPORT THE MERDEKA CURRICULUM IN REDOX REACTIONS AND ELECTROCHEMISTRY FOR PHASE F SENIOR HIGH SCHOOL
Full text linkAbstractThe research aims to evaluate the development of teaching materials that incorporate multiple representations of chemical concepts, specifically on the topic of redox and electrochemistry, to support the Merdeka Curriculum and enhance students mental models in Phase F of senior high school. Educational Design Research (EDR) was the chosen methodology and the study involved three university chemistry lecturers, two chemistry teachers, and nine students. Data collection was carried out using validity and practicality questionnaires. The results revealed that the average construct validity score of 0.87 and the average content validity score of 0,86 classified the materials as valid. Furthermore, the practicality assessment showed that this teaching material received a high practicality score, with a score of 97% from teachers and 92% from students indicating ease of application in learning. In conclusion, the teaching materials developed for redox and electrochemistry lessons, incorporating multiple chemical representations, were proven to be both valid and highly practical, supporting the goals of the Merdeka Curriculum in fostering deeper student understanding
EFFECT OF SOLVENT AND EXTRACTION TIME VARIATION ON THE COFFEE OIL EXTRACTION RESULTS
Full text linkThe traditional coffee with the greatest taste is called arabica. One of the ingredients made from coffee beans and used for air freshener is coffee oil. The Soxhlet extraction method, a separation technique that is often used to separate one or more compounds from a solid or liquid by adding a solvent, is one of the processes for making coffee oil. This research has been done before, but a comparison of different types of solvents and inclusion of differences in extraction time has not been done. The purpose of this research is to understand how the difference in extraction time and the comparison of solvent types affect the yield, density, and acid number produced. Extraction of hexane and ethanol by distillation for 120 minutes is a research technique. Extraction times were 90, 120, 150 and 180 minutes. In this study, the largest extraction with ethanol solvent was produced within 120 minutes of 25.75%, while the highest percent yield of coffee oil with hexane solvent was obtained within 120 minutes of 17.3%. The maximum specific gravity for 180 minutes with ethanol solvent is 0.94 gr/ml, while for 180 minutes with hexane solvent is 0.91 g/mL. Coffee oil with hexane solvent produced an acid value between 3.2 and 7 mg KOH/g, while coffee oil with ethanol solvent produced an acid value between 4.6 and 11.2 mg KOH/g