Garuda - Garba Rujukan Digital

KOMPARASI MODEL CONTEXTUAL TEACHING AND LEARNING (CTL) MENGGUNAKAN MEDIA LABORATORIUM DAN LINGKUNGAN TERHADAP PRESTASI DAN MOTIVASI BELAJAR PADA MATERI POKOK SISTEM KOLOID SISWA KELAS XI IPA SMA NEGERI 4 SURAKARTA TAHUN PELAJARAN 2011/2012 Ratri, Monica Cahyaning; Redjeki, Tri; Nugroho C. S., Agung
Jurnal Pendidikan Kimia Vol 2, No 1 (2013)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (474.595 KB)

Penelitian ini bertujuan untuk mengetahui perbedaan: (1) pengaruh penggunaan media laboratorium dan lingkungan pada pembelajaran materi sistem koloid dengan model CTL terhadap prestasi belajar aspek kognitif, (2) pengaruh penggunaan media laboratorium dan lingkungan pada pembelajaran materi sistem koloid dengan model CTL terhadap prestasi belajar aspek afektif, (3) pengaruh penggunaan media laboratorium dan lingkungan pada pembelajaran materi sistem koloid dengan model CTL terhadap motivasi belajar siswa. Sampel adalah siswa kelas XI IPA sebanyak dua kelas, yang diambil dengan teknik cluster random sampling. Teknik pengumpulan data prestasi belajar kognitif menggunakan metode tes, prestasi belajar afektif menggunakan angket dan lembar observasi, sedangkan motivasi menggunakan angket. Teknik analisis data menggunakan analisis variansi satu jalur multivariat. Kesimpulan penelitian ini adalah: penggunaan media laboratorium dan lingkungan pada pembelajaran materi koloid dengan model CTL memberikan pengaruh yang sama terhadap prestasi belajar aspek kognitif, aspek afektif dan motivasi belajar siswa.

ANALYSIS STUDENTSâ€™ SCIENCE PROCESS SKILLS IN SENIOR HIGH SCHOOL PRACTICUM BASED ON SMALL SCALE CHEMISTRY (SSC) Harta, Johnsen; Pamenang, Fransisca Ditawati Nur; Listyarini, Risnita Vicky; Wijayanti, Lucia Wiwid; Hapsari, Natalia Diyah; Ratri, Monica Cahyaning; Asy'ari, Maslichah; Lee, Wonkoo
Unnes Science Education Journal Vol 8 No 3 (2019): December 2019
Publisher : Department of Integrated Science, Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang in Collaboration with Perkumpulan Pendidikan IPA Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/usej.v8i3.31857

Experiment is integral part of chemistry. Through experiments, everyone can verify and or find something new as an alternative solution to attract interest in meaningful chemistry learning. Innovative experimental packaging can be done with Small Scale Chemistry (SSC) to establish the importance of understanding and application related to the use of small amounts of reagents and reduce waste produced during chemistry practicum. This study aims to explore and analyze the science process skills of the second semester students of Chemistry Education Study Program, Sanata Dharma University, which focused for chemistry grade 12 in water electrolysis using straws and mini test tubes as physical chemistryâ€™s experiment and formation reaction of silver mirror uses vial bottle and mirror media as experiment of organic chemistry. The results show that studentsâ€™ science process skills which includes observation skills with good average score, prediction skills with good enough average score, skills in interpreting data with good average scores, and communication skills with good average score for two kind of experiments conducted. In general, students were enthusiastic in carrying out the two SSC experiments. The students also evaluate the experiments to be able to help develop and improve their soft skills in chemistry learning. Keywords: science process skills, senior high school practicum, small scale chemistry

PENCEMARAN SODIUM DODECYLBENZENE SULFONATE (SDBS) PADA IKAN AIR TAWAR: PENENTUAN AKUMULASI DAN MONITORING PENCEMARAN Monica Cahyaning Ratri
Jurnal Farmasi Sains dan Komunitas (Journal of Pharmaceutical Sciences and Community) Vol 14, No 1 (2017)
Publisher : Sanata Dharma University

The research for accumulation determination and monitoring of Sodium Dodecylbenzene Sulfonate (SDBS) contamination in freshwater fish has been conducted. The aims of this research were to determine the interference of protein and ions in analysis, the parameters of validation, the correlation of SDBS concentration in the basin and SDBS accumulation in catfish followed by SDBS analysis in freshwater fish that sold in market in the area of Yogyakarta city. This research was started by isolating SDBS from freshwater fish using soxhlet extraction method and then followed by analysis of SDBS using spectrophotometer UV-Vis with acridine orange (AO) reagent. The results showed that the presence of proteins might be interferre the analysis process, Ca2+ and Mg2+ ions might interfere the analysis process at concentrations 12 mg/L and 6 mg/L. Analytical method validation was performed and showed correlation coefficient values (r) was 0,9981, limit of detection was 0,089 mg/L, limit of quantification was 0,0296 mg/L, RSD 2% and % recovery between 83-107%. The content of the SDBS in fish increased with increasing concentrations of SDBS in water and caused the decrease of Bio-concentration Factor (BCF) value. The concentration of SDBS in the analysis of fish in the market were between 0,0012-0,0029 mg/g, 0,0038-0,0077 mg/g and 0.0008-0,0026 mg/g for catfish, red tilapia and carp, respectively.

Appropriate Technology-Based Project-Based Learning: 3D Printing Utilization for Learning Media Class Monica Cahyaning Ratri
International Journal of Applied Sciences and Smart Technologies Volume 04, Issue 02, December 2022
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v4i2.5308

Indonesia has more than ten thousand islands, making it an archipelago; therefore, the distribution of learning media and facilities over the country is difficult. This condition may affect the learning material delivery and the student's understanding. Thus, the do-it-yourself (DIY) learning media helps to overcome this condition. We investigated the usefulness of applying appropriate technology through the 3D printing technique to fabricate learning media inspired by local wisdom to meet the needs of learning media. The students were guided by a project-based learning (PjBL) method to find the problem, design their learning media, fabricate it using a 3D printer, and expected to be applied to deliver the teaching material in the class. This study aimed to observe the implementation of the designing process based on theory to reality. A qualitative method and questionnaire were used to measure student's responses. We found that PjBL learning based on a 3D printing project increases students' motivation through creativity and effectiveness in delivering the teaching materials. Furthermore, 3D printed-based learning media can easily be fabricated, producing less waste.

PELATIHAN PRAKTIKUM KIMIA SKALA KECIL ELEKTROLISIS AIR UNTUK GURU KIMIA DI WAE NAKENG, LEMBOR, NUSA TENGGARA TIMUR Pamenang, Fransisca Ditawati Nur; Harta, Johnsen; Ratri, Monica Cahyaning; Wijayanti, Lucia Wiwid; Octaviani, Laurensia; Anggreni, Viktoria Cosinta; Surianti, Yosefina Ermi
ABDIMAS ALTRUIS: Jurnal Pengabdian Kepada Masyarakat Vol 6, No 2 (2023): Oktober 2023
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/aa.v6i2.5520

Practicum is an activity that cannot be separated from chemical learning. Chemistry learning can be more meaningful through attractive practicum activities. One obstacle that arises in the implementation of the practicum is the availability of adequate practicum materials and tools. Small-scale chemistry practicum can overcome this obstacle, which is in the form of the use of materials that are environmentally friendly and available in the surrounding environment, as well as simple practicum tools that can be used. One of the small-scale chemistry practicums trained is the water electrolysis practicum. Simple practicum using sodium sulfate and water, able to explain the electrolysis of water well. Through this small-scale chemistry practicum training, teachers are expected to have the skills to carry out simple practicums and develop other practicum topics while still paying attention to the scientific field. Through this small-scale-based chemical practicum training, there is an increase in the mastery of the concept shown by an increase in the average score from 30.67 to 73.33. The teachers give a positive response regarding the implementation of this training activity.

Green Synthesis of Silver Nanoparticle using Anthurium andraeanum Leaves Extract for High School Practicum Module Ratri, Monica Cahyaning; Verina, Amadea Agnes
Orbital: Jurnal Pendidikan Kimia Vol. 8 No. 1 (2024): Orbital: Jurnal Pendidikan Kimia
Publisher : Chemistry Education Department of Education and Teaching Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19109/ojpk.v8i1.22249

Nanotechnology is a new subject in the Merdeka Curriculum that presents challenges in the chemistry learning process. Teachers need help delivering nanotechnology material due to a lack of understanding of the material and teaching materials. Therefore, a practicum module for synthesizing silver nanoparticles based on green chemistry was developed. The objectives of this study were (1) to know the quality of the practicum module in terms of feasibility and (2) to know the teacher's response to the developed module. The results of this study indicate that (1) Anthurium andraeanum leaves have the potential as a bioreductor for the synthesis of silver nanoparticles based on the color change of the silver nanoparticles solution and based on the absorption of UV-Vis spectrophotometer light at a wavelength of 438 nm which shows the characteristics of silver nanoparticles. (2) The developed practicum module has met the criteria of being highly valid, with a percentage of 93% in terms of media and 88% in terms of material. (3) The teacher's response to the developed product is very good, with a percentage of 98%. The developed practicum module is suitable for use in learning nanotechnology.

A Novel Synthesis Pathway for Silver Nanoparticles Using Anthurium Bipinnatifidum Ratri, Monica Cahyaning; Ipung, Kadek Erland Puba; Darmawan, Bobby Aditya
Walisongo Journal of Chemistry Vol. 7 No. 2 (2024): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v7i2.23862

The field of nanomaterial synthesis has grown substantially in recent years. However, many existing synthesis methods have significant drawbacks, such as the use of organic solvents that are harmful to the environment and the high cost of inorganic reducing agents. To address these issues, we developed a simple and cost-effective method for synthesizing silver nanoparticles (AgNPs) using Anthurium bipinnatifidum extract as a reducing agent and water as a green solvent. This green chemistry approach offers a quick and straightforward synthesis process, with the optimum incubation time and volume were 1 hour and 0.5 mL, respectively. The results of this new method show promising characteristics, as demonstrated by SEM, UV-Vis spectrophotometry, and FTIR analyses. Additionally, the surface plasmon resonance (SPR) of the synthesized AgNPs was observed at 431 nm, which aligns with the typical SPR for AgNPs. The particles formed were spherical, with sizes ranging from approximately 40 to 80 nm. This research establishes an efficient new procedure for AgNPs synthesis with excellent outcomes.

PELATIHAN PRAKTIKUM KIMIA SKALA KECIL: PEMBUATAN INDIKATOR ASAM BASA BERUPA BOLA ALGINAT UNGU UNTUK GURU-GURU KIMIA DI SMA SANTA FAMILIA Harta, Johnsen; Nur Pamenang, Fransisca Ditawati; Wijayanti, Lucia Wiwid; Ratri, Monica Cahyaning; Anggreni, Viktoria Cosinta; Surianti, Yosefina Ermi; Octaviani, Laurensia
ABDIMAS ALTRUIS: Jurnal Pengabdian Kepada Masyarakat Vol 6, No 1 (2023): April 2023
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/aa.v6i1.5490

The practicum management of chemistry teachers at senior high school on the topic of acid-base is quite good, although the majority are monotonous in testing acid-base properties using large amounts of solution. Some schools only limit the practical use of extracts from various flowers with certain color pigments, then tested on several samples and used as natural indicators, but have not paid attention to the number of reagents and estimated waste generated. The purpose of this activity is to improve the quality of classical practicum and the attractiveness of acid-base indicators from materials that refer to the principles of green chemistry. Service activities are carried out in training through the practicum method of making acid-base indicators using purple cabbage extract, sodium alginate, and 1% CaCl2 solution. This training provides a new and innovative description of the formation of purple cabbage extract gel as an acid-base indicator in the form of red balls under acidic conditions and green under alkaline conditions. Chemistry teachers were very happy and felt that this practicum was simple and interesting to be packaged and brought to the routine practicum conducted at schools.

A Novel Synthesis Pathway for Silver Nanoparticles Using Anthurium Bipinnatifidum Ratri, Monica Cahyaning; Ipung, Kadek Erland Puba; Darmawan, Bobby Aditya
Walisongo Journal of Chemistry Vol. 7 No. 2 (2024): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v7i2.23862

The field of nanomaterial synthesis has grown substantially in recent years. However, many existing synthesis methods have significant drawbacks, such as the use of organic solvents that are harmful to the environment and the high cost of inorganic reducing agents. To address these issues, we developed a simple and cost-effective method for synthesizing silver nanoparticles (AgNPs) using Anthurium bipinnatifidum extract as a reducing agent and water as a green solvent. This green chemistry approach offers a quick and straightforward synthesis process, with the optimum incubation time and volume were 1 hour and 0.5 mL, respectively. The results of this new method show promising characteristics, as demonstrated by SEM, UV-Vis spectrophotometry, and FTIR analyses. Additionally, the surface plasmon resonance (SPR) of the synthesized AgNPs was observed at 431 nm, which aligns with the typical SPR for AgNPs. The particles formed were spherical, with sizes ranging from approximately 40 to 80 nm. This research establishes an efficient new procedure for AgNPs synthesis with excellent outcomes.

Development of innovative electronic student worksheet (E-LKPD) based on somatic auditory visual intellectual (SAVI) on salt hydrolysis topic Ratri, Monica Cahyaning; Tina, Elisabeth Patricia Ito
Jurnal Pendidikan Kimia Vol. 16 No. 3 (2024): J. Pendidik. Kim : December 2024
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i3.65191

A low understanding of salt hydrolysis and a lack of mastery of mathematics in the calculation section is a problem in learning chemistry. Therefore, this research aim is to produce a good electronic student worksheet (E-LKPD) based on SAVI learning model by determining the quality of LKPD in terms of (1) feasibility and (2) student response. This research and development (R&D) used a 4D development model that was modified to 3D. The research instruments used were interview and validation sheets, test items in the E-LKPD, and student response questionnaires. The research sample consisted of 10 students of class XI MIPA. The results showed that (1) the developed E-LKPD has good quality because it met valid criteria with a percentage of 90% in terms of material and 87% in terms of media. The average score of E-LKPD effectiveness is 78 (high criteria), and practically average score of E-LKPD based on students' response questionnaire is 94.4%; (2) students said that E-LKPD can help them learn and the material is exposed clearly (92.5%), can be used for independent study (97.5%), and the design of the E-LKPD is attractive (95%). Based on the research results, SAVI-based innovative E-LKPD can be used in chemistry learning on salt hydrolysis topics.

Title

Found 10 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 10 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 10 Documents
Search