1,721,023 research outputs found
ELEKTRODA PEMBANDING (REFERENCE ELECTRODE) DAN KARAKTERISASINYA DALAM ELEKTROANALISIS
Get PDFElektroda pembanding mempunyai potensial yang sudah tertentu, diketahui dengan pasti dan
tidak mempengaruhi larutan sampel. Elektroda pembanding sebagai salah satu instrumen dalam analisis
secara elektrokimia mempunyai peranan yang penting disamping elektroda indikator. Berdasarkan
jenisnya dibedakan atas elektroda pembanding primer dan sekunder. Pemilihan dan pemakaian jenis
elektroda pembanding sangat diperlukan terutama bagi para peneliti yang menggunakan instrumen
atau metode analisis secara elektrokimia seperti potensiometri, polarografi, konduktometri, dan lain
sebagainya
Analisis Pemahaman Konsep Siswa Kelas XI IPA SMAN 1 Malang Pada Topik Bentuk Molekul
Get PDFAnalisis Pemahaman Konsep Siswa Kelas XI IPA SMAN 1 Malang pada Topik Bentuk Molekul. The purpose of research is to identify: (1) student’s understanding level about molecular shape, (2) student’s misconception about molecular shape, and (3) student’s ability to fulfill the problems in Indonesian language and English language about molecular shape. Research uses quantitative descriptive design. Populations are 11th Grade Science Students of SMAN 1 Malang in 2010/2011 academic year that consist of 6 classes. Samples are students of 11th Grade Science 1, 3, and 4. Sampling technique is simple random sampling, which takes the sample member randomly without concern in population’s strata. Instrument in research is 20 problems objective test; consist of 10 problems in Indonesian language and 10 problems in English language. Instrument’s reliability is 0.73 and the validity is 98.3%. Every problem has 5 alternative answers that are supported by reason of answer and interview result. Research result indicates that (1) Student’s understanding level about molecular shape is medium (54.5%). If regarded from aspects those are measured, student’s understanding about bond angle is medium (53.7%); students’ understanding about stability of molecule based on lone pair placement is medium (54.9%); prediction of molecular shape is high (60.1%); students’ understanding about the polarity of molecule is medium (40.7%); hybrid orbital is high (70.6%); and students’ understanding about hybridization process is medium (46.7%). (2) The student’s misconceptions are: (a) fewer amount of bonding pair, the value of bond angle is bigger (3.9%); (b) double bond donate two bonding pair (2.9%); (c) lone pair is not has effect in molecular shape prediction (25.5%). (3) Student’s ability to fulfill the problems in Indonesian language (55.78%) is equal with student’s ability to fulfill the problems in English language (56.07%)
Chemistry Teachers’ Perspectives to Enchancing Representational Competence in Learning Thermochemistry
Get PDFRepresentational competence is very essential for students because it is associated with the students' ability to use, interpret, translate and integrate chemical representations to understand chemical concepts properly. In this case, implementation of the various representations utilization is required in learning Thermochemistry to improve students' representational competence to fully understand Thermochemistry. Therefore, this study aims to analyze teachers' perceptions towards the understanding and implementation of chemical representations in chemistry learning to improve students' representational competence in thermochemistry. This research is a descriptive quantitative research conducted using survey method that involved 30 chemistry teachers. The sample in this study was taken by purposive random sampling at public and private high schools in East Java. The data were collected through a questionnaire using google form application. According to the results of the study 63.3% of teachers still have difficulty in teaching students the concept of thermochemistry using submicroscopic representations. The majority of teachers only use symbolic representations, even though the other two representations are very important. Although 77% of teachers have understood chemical representations, in teaching and measuring concept understanding, teachers have not integrated chemical representations. This is due to their lack of self-awareness about the importance of using various representations in improving students’ representational competence. Thus, training on representations is necessary in improving teachers’ understanding on chemical representations. The findings of the study stated that teachers’ understanding of representation and teachers’ experience in participating in the trainings contributed to the effectiveness of the implementation of various chemical representations utilization to improve students’ representational competence on the concept of thermochemistry. Keywords: representational competence, chemical representation, and thermochemistry.DOI: http://dx.doi.org/10.23960/jpmipa/v25i3.pp1559-157
Development and Validation of Higher Order Thinking Skills Based Instrument on Reaction Rate Subject
No full textThis development aims to produce a product in the form of a HOTS-based instrument on the reaction rate subject. The development model used refers to the ADDIE development model carried out in three stages: analysis, design, and development. The developed question instruments were validated by the expert validator and then ran a small-scale test. Data analysis obtained value validation of instruments at 93.33% and included very good criteria. The 15 items developed were declared valid and reliable with the Cronbach's Alpha value equal to 0.805. As much as 10 items are classified as moderate, 1 item is classified as easy, and 4 items are classified as difficult and 3 items out of 15 items have an ineffective distracting effect. Based on these results, it can be concluded that the question instrument is suitable for use
Five-Tier Diagnostic Test Instrument Validation on Reaction Rate Materials: To Identify the Causes of Misconception and Student Representation
Get PDFThis study aims to determine the validity of the five-tier diagnostic instrument. Empirical validation tests were carried out to identify the items' difficulty level, the different power of the items, the percentage of distractor effectiveness, and test the validity and reliability of the items. The results show that the five-tier diagnostic test instrument is feasible and valid to use by looking at the test difficulty level, discriminating power, distractor effectiveness, item validity, empirical validity, and reliability test. The difficulty level of the questions is included in the average level of easy difficulty at Tier A and Tier R. In contrast, and the Multiple representatives are included in the medium level of difficulty. The average results at Tier A, Tier R, and Multiple Representative in the differential power test have sufficient differential power
Analisis tembaga dalam mineral sulfida tertentu melalui pemisahan kromatografi penukar kation
No full textEnglish
No full textArgumentation skills are needed to prepare the generation to face the industrial era 5.0. This research aims to find out whether the SMART-Problem Solving strategy can improve students' scientific argumentation skills in the context of LSSI "Batu Malin Kundang" which is integrated in chemistry learning to encourage students to make good scientific arguments. This research is a quasi-experimental research with Pretest Posttest Control Group design, involving 101 class XI students at one of the State High Schools in Padang City. The research sample was selected using a convenience sampling technique, namely sampling based on availability in the field or samples that have easy access to researchers. Scientific argumentation skills were measured through pretest and posttest using scientific argumentation skills test instrument in the form of an essay (N=4). The data analysis used in this research is parametric (one way ANOVA). The results of the study showed that there was a significant difference in the average students' scientific argumentation abilities between the SMART-Problem Solving class (average score of 74.09), ADI (average score of 62.94) and the control class (average score of 43. 35), where learning SMART-Problem Solving with the LSSI context can improve argumentation skills effectivel
Research Trends of Virtual Laboratory in Science Learning to Improve Affective Domain: a Systematic Literature Review
Get PDFA virtual laboratory is a simulated environment that enables users to conduct various experiments anytime and anywhere without the need for a physical laboratory. Its main goal is to identify trends (such as publication year, education level, publication journal, keywords used, and academic disciplines) and map the platforms and affective domains related to virtual laboratories in science education. This systematic review utilizes 41 articles found in the scopus database from 2013 to 2023 using pre-determined criteria. The method applied is a systematic literature review following PRISMA guidelines. The results show that publication trends have fluctuated over time, with a significant increase in the last four years. Most studies were conducted at the higher education level, with the journal of chemical education being the most dominant publication outlet. Chemistry emerged as the most frequently explored discipline, and "virtual laboratory" appeared as a commonly used keyword. Various virtual laboratory platforms were employed in these studies, and most of the reported affective domains related to positive attitudes towards the learning proces
The Application of Instagram Social Media to Qualitative Analysis Materials for Groups I and II to Increase Student Interest in Learning
Get PDFThis study aims to determine the effectiveness of the application of Instagram media on students' interest in learning group I and II cation analysis materials. The data collection method used qualitative analysis with a descriptive approach. The results of the media validation get an average score of 84.27%, so the media is very feasible to be used in this study. Respondents in this study were students who followed the @kimiafun2022 Instagram account and interacted in answering questions and responses on Instagram. The study results show that the Instagram application can effectively increase student interest in learning about group I and II cation analysis materials, which is considered problemati
Chemistry Learning Media Based on Social Media: Students’ View
Get PDFChemistry learning should be able to integrate contextual chemistry problems and present the sophistication of 21st-century learning technology. Social media, as a product of 21st-century technology, has the potential to be used as chemistry learning media. Therefore, this study aims to investigate students’ views toward the potential use of social media as chemistry learning media. The survey method involved 791 students. A total of 40 question items were developed and distributed online using a Google form to respondents. Based on the results of a survey conducted, it is known that respondents are accustomed to using Instagram and TikTok as the most frequently used social media. Other results reveal that most respondents have the same screen time, more than 4 hours daily. This screen time is used by respondents for entertainment and looking for news information on social media. With the length of screen time not used for this learning process, it can be a promising opportunity to utilize social media as a medium for learning chemistry. This study is expected to be a reference for developing social media-based chemistry learning to increase student motivation and achievement
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