Pengembangan Buku Ajar Dengan Model Inkuiri Berbasis Strategi Konflik Kognitif Untuk Meningkatkan Keterampilan Berpikir Kritis Siswa

Chemical bonding contains basic concepts that are used to understand almost any topic in chemistry. Several research results show that there are still many misconceptions. Therefore, teaching materials are needed that can provide a correct understanding of the basic concepts in chemical bonding materials. This study aims to produce inquiry model chemistry teaching materials with cognitive conflict strategies for Muallimat NW Pancor high school. The development method used definne, design, development and dissemination. Data analysis was conducted in the form of product validity tests and students' critical thinking skills tests. However, in this development research, it only stopped at the third stage. The data obtained were quantitative and qualitative. The results is (1) the feasibility of the material was 84% (very feasible); (2) the systematic feasibility of the presentation is 85% (very feasible); (3) language feasibility is 85.33% (very feasible). So that overall the teaching materials produced are categorized as very feasible and can be used in chemistry learning.

Pengembangan Digital Flipbook untuk Menfasilitasi Kebutuhan Belajar Multiple Representation pada Materi Sel Volta

The voltaic cell teaching materials used in high school are still in the form of textbooks that do not present multiple representations of chemistry, namely the macroscopic, submicroscopic, and symbolic levels. The three levels of chemical representation can be visualized using flipbook teaching materials so that students are expected to understand the voltaic cell material. Teaching materials are used to support the learning process. Current learning still uses conventional learning models that only focus on teachers. Constructivist-based active learning is needed because it involves students so that learning is more meaningful. One of the constructivist learning models is the guided inquiry learning model which includes observing, asking questions, compiling hypotheses, gathering information, testing hypotheses, and concluding. The purpose.of this development.is to.produce a proper guided inquiry-based flipbook teaching material. The flipbook teaching.materials were developed.using the Four-D model (define, .design, .develop,and.disseminate) but the disseminated stage was not carried out. Media and material validation was carried out by five chemistry lecturers. The legibility test was carried out by 50 high school alumni with a specialization in Science. The assessment uses a Likert scale accompanied by comments, suggestions from the validator, and audience. The data obtained from the analysis questionnaire to determine the feasibility level of the product using the percentage technique. The validation of the flipbook teaching materials development product in terms of material obtained an average score of 85.4%, validation in terms of media.obtained.an.average percentage of 85.5%, while the readability test results obtained.an.average.percentage of 87%. Based on the results.of material validation, media, and legibility tests, it can be concluded that the flipbook teaching materials guided inquiry-based voltaic cells are very suitable as a learning resource.

Pengaruh Volume Minyak Sumbawa Sebagai Antibakteri dalam Pembuatan Sabun Mandi Cair

Soap is a necessity for daily life, such as for bathing, washing, and cleaning other necessities. Normally various kinds of bacteria and fungi can live permanently on the skin, for example, such as thebacteria Staphyloccocus aureus. Antibacterial soap is used as a solution to this bacterial problem. Sumbawa oil is a natural ingredient that has the potential to be antibacterial in body wash. Sumbawa oil contains geraniol and citronellal, flavonoids, polyphenols and also contains saponins and tannins. The research objective was to find out what volume of Sumbawa oil is used to obtain the quality of liquid bath soap which has antibacterial content and meets SNI standards. This research is an experimental research in a laboratory by varying the volume of Sumbawa oil. The parameters measured in this study were the effect of variations in the volume of Sumbawa oil on antibacterial properties and pH of liquid bath soap. The findings in this study that the best antibacterial properties were found in the addition of 15 ml volume of Sumbawa oil with an average inhibition zone of 19.5-22.3 mm and a pH of 5 ml of Sumbawa oil volume with an average pH of 6.1. Based on the above findings, it can be concluded that the addition of Sumbawa oil has an effect on the antibacterial properties and pH of liquid bath soap.

Pengembangan Multimedia Interaktif Kimia Berbasis PBL (Problem Based Learning) untuk Meningkatkan Keterampilan Generik Sains Siswa

Most of the students had difficultyin understanding the concept of chemistry which is abstract and cannot connect the concepts studied with the phenomena in everyday life.This is because the instructional media and learning models used by the teacher do not pay attention to submicroscopic representations and do not link chemistry with the environment around students.This study aims to develop Chemical Interactive Multimedia (CIM) based on PBL (Problem Based Learning) to improve students' Generic Science Skills (GSS). PBL-based CIM was developed on the concept of salt hydrolysis in a tutorial format. This study was a Research and Development using the ADDIE design. The research procedure consists of five stages, namely Analyze, Design, Development, Implementation, and Evaluation. The PBL-based CIM effectiveness test against the GSS of MA Darul Habibi NW Paok Tawah students was carried out at the implementation stage using a one-group pretest-posttest design. The instrument used was in the form of a questionnaire to obtain eligibility data and student responses, as well as a description test to obtain KGS data. CIM based on PBL feasibility data will be analyzed using a five-scale absolute norm, student responses were analyzed descriptively, and GSS data were analyzed using a normalized gain score (N-gain). The validation results show that PBL-based MIK has an average score of 92% which means it was very feasible.The limited trial of 12 students stated that PBL-based CIM met the aspects of appearance, readability, language, and ease of use very well.The results of PBL-based CIM trials in learning can increase students' GSS which is indicated by an average N-gain score of 58% in the moderate category.Therefore, it can be concluded that PBL-based MIK was successfully developed in the very feasible category and could improve students' GSS.

Identifikasi Kemampuan Berpikir Kritis Siswa dengan Menggunakan Five-Tier Multiple Choice pada Materi Hidrolisis Garam

This study aims to determine the critical thinking skills of high school students on salt hydrolysis. This research is quantitative descriptive. The population used in this study were all class XI IPA SMA in Gorontalo with a total sample of 64 respondents. Collecting data using a five-level multiple choice test instrument on salt hydrolysis material with an instrument validity value of 100%. The data analysis technique used in this research is descriptive quantitative. The results obtained the percentage of indicators of critical thinking skills, namely the focus criteria or Q1 level an average of 77.60%, the Reason criteria or Q2 level of 23.95%, the inference criteria or Q3 level of 8.85%, at Situation criteria or the Q4 level of 4.34% and the Clarity criteria or the Q5 level of 3.12%. Based on the results of the study it can be concluded that the ability of high school students to think critically on salt hydrolysis is 51.56% of students are in the very low category, 46.87% of students are in the low category and 1.56% of students are in the moderate category.

Limbah Cangkang Telur Ayam Ras (Gallus Domesticus) Sebagai Bahan Pupuk Untuk Memperbaiki Sifat Kimia Tanah

Degradation of soil quality caused by the use of chemical fertilizers is a serious problem in agriculture. The use of environmentally friendly fertilizers is an important step to increase soil quality. One of them is by utilizing chicken eggshell waste as organic fertilizer. This study aims to utilize chicken eggshells with the right dose to improve soil quality. This research is a quantitative study using a completely randomized design. The results showed that the eggshell waste had the potential as an organic fertilizer to improve soil chemistry. Application of 6.25 gram egg shell/planting-hole can increase soil pH, C-Organic and N-total levels.

Pemanfaatan Potensi Lokal Jombang Berupa Bunga Pacar Air Sebagai Indikator Alami

Acid base properties can be easily observed based on the difference in color when using indicators. The use of indicators is very rare at the secondary school. Natural indicator are needed to support acid-base learning at the secondary school. This study aims to determine the effectiveness of local potency extract of jombang in the form of henna flowers as a natural indicator and the effectiveness of HVS paper and filter paper as indicator paper. Natural indicator paper was obtained by immersing HVS paper and filter paper in the extract of red and purple henna flowers using water solvent. The test result in acid and base solution showed that the red and purple henna flower extract had the same effectiveness as a natural indicator, as well the red and purple henna flower extract indicator paper made from HVS paper and filter paper.

Pengaruh Keterampilan Proses Sains Melalui Model Inkuiri Terbimbing terhadap Hasil Belajar Siswa pada Materi Larutan Asam Basa

Chemistry learning has so far emphasized macroscopic and symbolic aspects as a result of misconceptions and students' low understanding of chemistry. This study aims to determine the influence of science process skill through guided inquiry model on student learning outcomes on acidic-basicsolution topic. The type of research is experimental research with Posttest-Only Control Design. Sampling was done by using Purposive Sampling technique. The sample of research for the experimental class and control class were 31 students, respectively. Data collection using objective test as an instrument that contains test about acidic acid material. Data analysis technique used to test the research hypothesis is t-test. Based on the statistical results obtained the average value of post-test experimental class is 58.55 while for the control class the average post-test value is 39.68. Result of data analysis for learning result show that in significant level 0,05 obtained tcount> t table (6,22> 1,671), then H0 rejected or accepted H1. Thus it can be concluded that there is the influence of process skills of science through guided inquiry model on student learning outcomes on acidic acid solution materials.The positive effects are also discussed in this study.

PENENTUAN NILAI SPF DAN UJI ANTIBAKTERI Staphylococcus aureus EKSTRAK DAUN DAN KULIT BATANG TANAMAN BANGKAL (Nauclea Subdita)

Tanaman bangkal adalah tanaman khas kalimantan selatan. Umumnya masyarakat kalimantan selatan menggunakan kulit tanaman bangkal untuk kosmetik dan daun tanaman bangkal untuk pengobatan tradisional. Penelitian ini bertujuan untuk mengetahui kemampuan tabir surya yang ditentukan melalui penentuan nilai SPF (Sun Protection Factor) dan uji antibakteri Staphylococcus aureus pada ekstrak etanol daun dan kulit batang tanaman bangkal (Nauclea subdita). Penentuan nilai SPF dilakukan menggunakan spektrofotometer UV-Vis dan uji antibakteri ekstrak terhadap Staphylococcus aureus dilakukan menggunakan metode difusi cakram. Klindamisin sebagai kontrol positif digunakan untuk menjadi pembanding aktivitas antibateri. Berdasarkan data yang diperoleh diketahui bahwa nilai SPF meningkat sesuai dengan meningkatnya konsentrasi ekstrak, baik untuk ekstrak daun maupun ekstrak kulit batang tanaman bangkal. Secara keseluruhan nilai SPF ekstrak daun lebih tinggi dibandingkan ekstrak kulit batang tanaman bangkal. Uji antibakteri pada ekstrak daun dan kulit batang tanaman bangkal menunjukkan bahwa zona hambat yang terbesar dihasilkan oleh aktivitas antibakteri ekstrak daun tanaman bangkal dengan konsentrasi 300 ppm dan kekuatan antibakterinya termasuk kategori sedang, sedangkan ekstrak kulit batang tanaman bangkal tidak menunjukkan ada zona hambat.

Dampak Process-Oriented Guided-Inquiry Learning (POGIL) terhadap Pengetahuan Metakognitif Siswa pada Topik Asam-Basa

Aim of this research is to investigate different impact of Process-Oriented Guided-Inquiry Learning (POGIL) and verification as learning approach at senior high school students’ metacognitive knowledge grade XI program IPA on acid-base topic. Research design used was quasi experimental. Hypothesis testing uses t-test with 5% (0,05) significance utilizing SPSS 21 application. Results show that (1) there is significance difference of students’ metacognitive knowledge that is taught by POGIL approach and verification, and (2) students that are taught by POGIL approach give better answer’s pattern of declarative, procedural, and conditional knowledge than students that are taught by verification approach.