Jurnal Pena Sains
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ADSORBENT SYNTHESIS FROM Penaeus monodon CHITOSAN AS COPPER ABSORPTION IN ELECTROPLATING LIQUID WASTE
Full text linkChitosan in Penaeus monodon is a chitin compound removed from the acetyl group leaving a polysaccharide amine group and is polycationic through the chitin deoxidation process. The purpose of this study was to identify the potential use of chitosan adsorbent from Penaeus monodon (Chi-ShSW) on decreasing levels of copper (Cu) in electroplating industrial wastewater and to analyze the effect of variations in flow rate using chitosan adsorbents on reducing levels of copper (Cu) in electroplating industrial sewage. Chi-ShSW can be an adsorbent to reduce Cu (II) metal ions in the Metal Coating Industry wastewater. The adsorption test was carried out with a continuous flow system with different debits. The highest reduction in Cu waste in the study occurred at a flow rate of 215 ml/minute with a time of 84 minutes with a Cu content in the Metal Coating Industry wastewater of 1.227 mg/l and a reduction efficiency of 75.86%. The utilization of chitosan from Penaeus monodon was successfully synthesized as an adsorbent for the wastewater treatment of the metal coating industry. It can be concluded that Penaeus monodon can be used as an adsorbent to degrade Cu(II) metal ions contained in electroplating wastewater
DETERMINATION OF VITAMIN C IN SPINACH (Amaranthus sp.) USING TITRATION METHOD
Full text linkVitamin C is a compound that is included in the group of water-soluble vitamins. The human body really needs vitamin C intake because it can act as an antioxidant which is closely related to collagen formation and iron absorption. Vitamin C is an organic compound that the human body needs in small amounts to maintain the body metabolic functions. Vitamin C is also one of the most important vitamins in increasing the body immunity This compound is very easy to find in fruits and vegetables, one of which is spinach. Spinach is a vegetable which generally contain vitamin C with an average of 158.54 mg/100 g. The research aims to analyze vitamin C levels in spinach using a titration method or also known as iodometric titration. This research method is included in an experimental study. The sample used in this research was obtained from Kotagede Market, Yogyakarta. The titration results for each spinach will be analyzed using Microsoft Excel, where the results have shown that the levels of vitamin C contained in snapper spinach (18.95 mg/100 g), picked spinach (46.39 mg/100 g), thorn spinach (14.52 mg /100 g) and red spinach (15.42 mg/100 g). Therefore, it can be concluded that this titration method can be used to accurately measure the vitamin C content in spinach. The iodometric titration method was chosen to analyze vitamin C levels because this application is very simple when compared to other methods. Ascorbic acid or vitamin C is known as a strong reducing agent and can simply be titrated using iodine solution
NEED ANALYSIS IN THE DEVELOPMENT OF MINI RESEARCH-BASED GENERAL PHYSIOLOGY LEARNING SETS
Full text linkThe general physiology course prepares prospective junior high school science teachers to master the content and science process skills. Skills used to acquire or apply science concepts, laws, theories including mental, physical and social skills are called science process skill. Science process skill is the basis for making rational and correct decisions about controversial issues. Science learning, including at the Junior High School level, should ideally not only be memorized knowledge but also a research process using science process skills, so that students are able to gain science knowledge from new phenomena in nature. To improve the students’ science process skills, the learning sets used by lecturers should be implemented effectively, so it is necessary to analyze the needs of learning sets. The research aims to explain the need analysis in the development of mini research-based general physiology learning sets. The research method used is a qualitative study with the data analysis technique of the Miles Huberman Model. This research was conducted in January 2022 at the Science Education Study Program, Faculty of Teacher Training and Education, University of Sultan Ageng Tirtayasa, Indonesia. Need analysis of learning sets includes needs in the aspects of students, concepts, assignments, and learning objectives. Needs analysis results are learning sets for general physiology based on mini-research suitable for improving the science process skills of prospective science teachers. Comprehensive and truly needs analysis can apply to the next stage of research and development. It can be concluded that the development of mini research-based general physiology learning sets should be conducted according to the findings of need analysis
DIFFERENCES OF STUDENTS’ CHEMISTRY LEARNING OUTCOMES BASED ON THE 5E LEARNING CYCLE MODEL
Full text linkThe 5E learning cycle model is a learning model that gives opportunities for students to be able to maximize learning by guiding students to be involved in the learning process actively. One of the chemistry concepts that is difficult for students to understand is acid-base topic. This study aims to find out the differences in students' chemistry learning outcomes that apply the 5E learning cycle model by using handouts and PowerPoint-based learning media on acids and bases topic in the eleventh grade of a state senior high school of Medan. This research is included in a quasi-experimental research design with a pretest-posttest control group design. The sample in this study was eleventh grade with experimental class I taught using the 5E learning cycle model assisted by handout media and class experimental II taught using the 5E learning cycle model assisted by PowerPoint-based learning media. Sampling was completed using a random sampling technique. The instrument used in this study was an objective question in the form of multiple choice of 20 questions which had been tested for validity, difficulty level, discriminating, and reliability. The handout media used in this research has been validated by three expert validators and is suitable for use. The result of this research indicates that there are differences between the two classes with the average student learning outcome in experimental class I which was 85,33 compared with the average student learning outcome in experimental class II which is 80,67. Thus, it can be concluded that the 5E learning cycle model using handout media can be applied to the learning process, especially in acid-base topic
IMPLEMENTATION OF STAD-BASED LEARNING MODEL IN IMPROVING STUDENTS’ LEARNING OUTCOMES
Full text linkThis research was conducted with the aim of increasing student learning outcomes using the STAD learning model on the topic of human digestive system at Payeti Christian Middle School. This research is included in a Class Action Research designed by the Khemis Mc Tanggart model for this study which consists of cycle I and cycle II. Of the four stages, namely planning, implementation, observation, and reflection. The research subjects were 28 grade VIII students. The results showed that the application of the student teams achievement divisions model could improve student learning outcomes in science subjects at Payeti Christian Middle School. The enhancement of students’ learning achievements can be seen from the pre-cycle, cycle I, and cycle II through the learning carried out. This enhancement of student learning outcomes in the cognitive domain at the pre-cycle stage average value of 47.8 cycle I average value of 72.2, experienced an increase in cycle II average value of 80%. In the psychomotor aspects of the first cycle, the average value is 75, with a percentage of 80%. Meanwhile, the psychomotor aspects of cycle II averaged 89.75 with a percentage of 94%. Thus, it can be concluded that the implementation of the student teams achievement divisions model can improve student learning outcomes in biology subjects on the topic of the human digestive system at Payeti Christian Middle School
MACRONUTRIENT ANALYSIS OF ORGANIC FERTILIZER FROM THE MIXTURE OF Casuarina equisetifolia LEAF LITTER AND Ananas comosus RIND WASTE WITH EFFECTIVE MICROORGANISM BIOACTIVATOR
Full text linkThis study aims at analyzing macronutrients of organic fertilizer from the mixture of Casuarina equisetifolia leaf litter and Ananas comosus rind waste with effective microorganism bioactivator. Research on making and analyzing the nutrient content of organic fertilizers has been carried out using a mixture Casuarina equisetifolia leaf litter and Ananas comosus rind waste which consists of three variations of the composition with two repetitions. The process of making compost is conducted by mixing small pieces of pineapple litter and rind and mixed with effective microorganism (EM4) in a container. The composting process occurs for a maximum of 31 days based on the temperature measurement of the fertilizer. In the degree of acidity test using digital pH meter, it shows that the pH level is classified as acidic, the pH variations of the fertilizer P0U1, P0U2, P1U1, P1U2, P2U1, and P2U2 are 5.029 respectively; 5,026; 4,934; 4,047; 5,452; and 4,551. The results of the analysis of the elemental nitrogen content (%) of various fertilizers P0U1, P0U2, P1U1, P1U2, P2U1, and P2U2 were 0.27; 0.38; 0.39; 0.41; 0.36; and 0.39. The results of the C-organic element analysis (%) were 25.87; 29.12; 35.58; 30.77; and 29.66. The phosphorus content (%) obtained was 0.147; 0.137; 0.138; 0.136; 0.139; and 0.142. Potassium content (%) of 0.32; 0.25; 0.56; 0.78; 1.23; and 1.79. The C / N ratio of each fertilizer variation was sequential, namely 95.81; 76.63; 83.23; 86.78; 85.47; and 76.05. The analysis parameters for C, P, and K show conformity with the National standard provisions
ANALISIS RESPON MAHASISWA TERHADAP PENGGUNAAN E-MODUL INTERAKTIF BERBASIS KOMUNIKASI SAINS
No full textThe science learning process in the 21st century era, especially at the tertiary level requires prospective science teachers to have science communication skills. Science communication skills are part of the science process skills that direct students to be able to express ideas, knowledge which contains data and facts that can be expressed in oral or written form. Science communication skills are considered as a source for developing and creating knowledge in the science learning process which are needed to act as a link so that students can share their experiences and understanding. Apart from that, the lack of availability of teaching materials in biotechnology lectures is a concern in this research. This research aims to describe student responses toward the science communication-based interactive e-module that has been developed and implemented in the Biotechnology course. This research is a quantitative descriptive study using a survey method. The samples involved in the research were 37 students from the sixth semester of the Science Education Study Program, class B, where practical tests were carried out on a limited scale. The research sample was taken using random sampling. The instrument used was a student response questionnaire sheet consisting of 40 statements. The data obtained includes practical results through student responses toward the e-module being developed. Student response questionnaires were analyzed quantitatively using descriptive analysis. The research results showed that student responses were very positive from all respondents with an overall average percentage reaching 82%. It can be concluded that the science communication-based interactive e-modules can be well received by science students as users.Penelitian ini dilatarbelakangi oleh perubahan proses pembelajaran IPA di era abad 21 khususnya di tingkat Perguruan Tinggi yang menuntut calon guru IPA untuk memiliki keterampilan komunikasi sains. Selain itu kurang tersedianya bahan ajar dalam perkuliahan bioteknologi menjadi perhatian dalam penelitian ini. Penelitian ini bertujuan untuk mengetahui gambaran respon mahasiswa terhadap e-modul interaktif berbasis komunikasi sains yang telah dikembangkan dan diimplementasikan dalam mata kuliah Bioteknologi. Penelitian ini merupakan deskriptif kualitatif dengan metode survey. Sampel yang dilibatkan dalam penelitian adalah mahasiswa Prodi Pendidikan IPA semester VI kelas B dengan jumlah 37 orang dimana uji kepraktisan dilakukan dalam skala terbatas. Pengambilam sampel penelitian dengan cara random sampling. Instrument yang digunakan adalah lembar kuisioner respon mahasiswa yang terdiri dari 40 pernyataan. Data yang diperoleh meliputi hasil praktikalitas melalui respon mahasiswa terhadap e-modul yang dikembangkan. Angket respon mahasiswa dianalisis secara kuantitatif dengan menggunakan analisis deskriptif. Hasil penelitian menunjukkan bahwa respon mahasiswa sangat positif dari seluruh responden dengan rata-rata keseluruhan persentase mencapai 82%. Hal ini menunjukkan bahwa keberadaan e-modul interaktif berbasis komunikasi sains dapat diterima baik oleh mahasiswa IPA sebagai pengguna.
ASSESSMENT OF PROBLEM-SOLVING SKILLS IN THE TOPIC OF ENVIRONMENT: ITS VALIDITY AND RELIABILITY
Full text linkThis study aims to determine the validity and reliability of the instrument for assessing problem-solving skills in the topic of environment. This research includes in a research and development of test instruments with the ADDIE model, namely analysis, design, development, implementation, and evaluation. The instrument that had been made was then tested on 31 students at the Islamic Boarding School of Jagad 'Alimussirry, Surabaya. The data were analyzed for its validity and reliability. The validity was measured using the Pearson product-moment correlation coefficient test. The reliability test used Cronbach's alpha test. The results of the study show that all items are valid and reliable in the high category. The percentage of eligibility from experts (material experts, education experts, and education practitioners) is 89% with a very decent category so this instrument is declared suitable to be used to measure problem-solving skills. This instrument contains five stages of problem-solving, namely identifying problems, determining solutions, planning solutions, implementing solutions, and evaluating the results of problem-solving. The problems identified consist of two kinds, namely social problems and physical problems in Islamic boarding schools. To conclude, the problem-solving skills assessment can be used by students to improve the abilities in analyzing problems
GAME-BASED LEARNING MEDIA AND ITS EFFECT TOWARD STUDENTS’ LEARNING ACHIEVEMENT
Full text linkThis study aims to determine the effect of game-based learning media toward students’ learning achievement. The game-based learning media implemented during this study was Quizziz. This research design used a Non-equivalent control group design with Quasi Experiment method. The research sample comprised 20 students, ten from class XI MIPA 5 as an experimental class and ten from class XI MIPA 6 as a control class. The research instrument is a learning achievement test in the form of a pretest and posttest with as many as 15 questions numbers. Based on the game-based learning media analysis result, it shows that implementing learning using Quizizz game-based learning media is better than conventional learning methods. It can be seen from the calculation of the quizizz game media t-test shows that the sig t count is 0.000 0.05, then H1 is accepted, and H0 is rejected. The results of the score analysis averaged the completeness of the experimental class reached 76.40 with high criteria, while the conventional learning method in the control class of 65.90 with medium criteria. All in all, game-based learning media is proved that it affects in the students’ learning achievement on digestive system topic
