Universitas Negeri Manado, Jurusan Kimia: Open Journal Systems
Not a member yet
270 research outputs found
Sort by
Analisis Miskonsepsi Siswa Pada Materi Hukum Dasar Kimia Menggunakan Two-Tier Diagnostic Test Di SMA Negeri 1 Tatapaan
Get PDFMisconception is a concept that is not in accordance with the scientific understanding or concepts recognized by experts. Student misconceptions are found while at school when learning in class, from experience, and their observations in society or in everyday life. Students' misconceptions are also obtained through their knowledge at the previous school level. This research aims to analyzing students' misconceptions on basic chemical law material at SMA Negeri 1 Tatapaan. Data collection was in the form of two-tier diagnostic test questions, which were tested on 13 students. The data analysis used in this study is the Rasch model. From the results of the study it was concluded that 62% of students who understood the concept, and 23% of students who experienced misconceptions, while 15% of students who did not understand the concept of basic chemistry law material.Miskonsepsi merupakan suatu konsep yang tidak sesuai dengan pengertian ilmiah atau konsep yang diakui oleh para ahli. Ketika berada di sekolah, ketika belajar di dalam kelas, siswa dapat mengalami miskonsepsi, maupun dari pengalaman dan pengamatan mereka di masyarakat atau dalam kehidupan sehari-hari. Miskonsepsi pada siswa bisa juga didapatkan melalui pengetahuan mereka di jenjang sekolah sebelumnya. Penelitian ini bertujuan untuk menganalisis miskonsepsi siswa pada materi hukum dasar kimia di SMA Negeri 1 Tatapaan. Pengumpulan data berbentuk soal tes diagnostik two-tier, yang diujikan kepada 13 siswa. Peneliti menggunakan Rasch Model untuk analisis data pada penelitian kali ini. Dari hasil penelitian disimpulkan bahwa siswa yang memahami konsep 62%, dan siswa yang mengalami miskonsepsi sebanyak 23% sedangkan siswa yang tidak paham konsep 15% pada materi hukum dasar kimia
Pengembangan Video Pembelajaran Materi Ikatan Kimia Dengan Model ADDIE Sebagai Penunjang Pembelajaran Di Masa Pandemi COVID-19
Get PDFThe purpose of this study was to develop a Learning Video for Chemical Bonding Materials with the Addie Model as Learning Support during the Covid-19 Pandemic. This research is research and development (Research and Development). This research is a research that refers to the ADDIE model (Analysis, Design, Development or Production, Implementation or Delivery and Evaluations). By following the fifth stage of the ADDIE model, because this is a Video Development research, this research only reaches the fourth stage, namely the Implementation stage. Data collection techniques in this study used a Validation Questionnaire (validation of media experts and validation of material experts) and Student Response Questionnaires. The results of the first material expert validation are included in the "very feasible" criteria with a percentage of 80%. The results from the second validation questionnaire are included in the 'very feasible' criteria with a percentage of 100%, the results from the first media expert validation questionnaire with the 'very feasible' criteria with a percentage of 95.12%, the results from the second validation questionnaire are included in the 'very feasible' criteria with a percentage 86.66% and the results of the student response questionnaires are included in the "very feasible" criteria with a percentage of 90%. Learning videos are declared very suitable for use in the learning process.Tujuan dari penelitian ini adalah untuk mengembangkan Video Pembelajaran Materi Ikatan Kimia Dengan Model Addie Sebagai Penunjang Pembelajaran Dimasa Pandemi Covid-19. Penelitian ini adalah penelitian pengembangan (Research and Development). Penelitian ini merupakan penelitian yang mengacuh pada model ADDIE (Analysis, Design, Development or Production, Implementation or Delivery and Evaluations). Dengan mengikuti kelima tahap pada model ADDIE, karena ini adalah penelitian Pengembangan Video maka penelitian ini hanya samapai pada tahap yang keempat yaitu tahap Implementasi. Teknik pengumpulan data pada penelitian ini menggunakan Angket Validasi (validasi ahli media dan validasi ahli materi) dan Angket Respon siswa. Hasil dari angket validasi ahli materi pertama termasuk dalam kriteria “sangat layak†dengan persentase 80%. Hasil dari angket validasi kedua termasuk dalam kriteria “sangat layak†dengan persentase 100%, hasil dari angket validasi ahli media pertama kriteria “sangat layak†dengan persentase 95.12%, hasil dari angket validasi kedua termasuk dalam kriteria “sangat layak†dengan persentase 86.66% dan hasil dari angket respon siswa termasuk dalam kriteria “sangat layak†dengan presentase 90%. Video pembelajaran dinyatakan sangat layak digunakan dalam proses pembelajaran
Pengaruh Penerapan Video Pembelajaran Melalui Google Classroom Pada Materi Larutan Elektrolit dan Non Elektrolit Terhadap Hasil Belajar Siswa di SMA N 1 Langowan
Get PDFThe purpose of this study was to determine the effect of the application of learning videos through Google Classroom on the learning outcomes of X Mipa 4 students at SMA N 1 Langowan. This research is a quantitative research using experimental method using One-Group pretest-posttest design. The population taken is all class X MIPA SMA N 1 Langowan, the sample consists of 1 class, namely X MIPA 4 as an experimental class, totaling 32 students. Data collection was done by giving a pretest before the learning process was carried out, and a posttest after the learning process. Data The results obtained in the form of the difference between the pretest and posttest in the experimental class are 40.4 and the average pretest is 47.7, while the posttest average is 88.1. get that the data is normally distributed. Furthermore, the test through t-test, the results obtained between the experimental class are significant, namely tcount = 18.60 > ttable = 1.998. Thus, it can be concluded that the Google Classroom learning media which contains video can affect student learning outcomes.Tujuan dari Penelitian ini adalah untuk mengetahui Pengaruh Penerapan Video Pembelajaran melalui Google Classroom Terhadap Hasil Belajar siswa X Mipa 4 di SMA N 1 Langowan. Penelitian ini adalah penelitian kuantitatif menggunakan metode experiment dengan menggunakan desain One-Group pretest-posttest design. Populasi yang diambil adalah seluruh kelas X MIPA SMA N 1 Langowan sampel terdiri dari 1 kelas yaitu X MIPA 4 Sebagai kelas eksperimen yang berjumlah 32 orang siswa. Pengambilan data dilakukan dengan memberikan pretest sebelum proses pembelajaran dilaksanakan, dan posttest setelah proses pembelajaran. Data Hasil penelitian yang diperoleh berupa selisih pretest dan posttest pada kelas eksperimen 40,4 dan rata-rata pretest yaitu 47,7, sedangkan rata-rata posttest yaitu 88.1, Sebelum di lakukan uji one sample t test terlebih dahulu di lakukan uji normalitas dan di dapatkan bahwa data terdistribusi normal. Selanjutnya uji melalui uji-t, hasil yang didapat antara kelas eksperimen signifikan yaitu thitung thitung = 18,60 > ttabel = 1,998. Dengan demikian dapat disimpulkan bahwa media pembelajaran Google Classroom yang berisikan Video dapat berpengaruh pada hasil belajar siswa
Hubungan Proses Belajar Daring Masa Pandemi Covid-19 Dengan Prestasi Belajar IPA Siswa Kelas X SMA Negeri 2 Tondano
Get PDFThis study aims to determine the relationship between the online learning process during the Covid-19 pandemic and the science learning achievement of class X SMA Negeri 2 Tondano students. The online learning process is a teaching and learning process that is carried out online and interactively by utilizing information and communication technology, such as computer media with the internet as the delivery and recipient of the material. The research design used is correlational, with data collection techniques in the form of questions (statements) questionnaires and the average value of report cards using 20 students as samples. Tests carried out to prove the hypothesis were carried out by simple linear regression analysis, Pearson Product Moment correlation and t-test. The results of the regression equation obtained are Y = 0.2634x + 68.519 with a correlation value of r = 0.693 in the level of strong relationship, and the results from the t-test are tcount = 4.080 and ttable = 2.100, meaning tcount > ttable at = 0,05, the correlation between variables X and Y is significant, meaning that there is a strong and significant relationship between the online learning process during the Covid-19 pandemic and the science learning achievement of class X SMA Negeri 2 Tondano students.Penelitian ini bertujuan untuk mengetahui adanya hubungan proses belajar daring masa pandemi Covid-19 dengan prestasi belajar IPA siswa kelas X SMA Negeri 2 Tondano. Proses belajar daring merupakan proses belajar mengajar yang dilakukan secara online dan interaktif dengan memanfaatkan teknologi informasi dan komunikasi, seperti media komputer dengan internetnya sebagai penyampaian maupun penerima materi. Desain penelitian yang digunakan adalah korelasional, dengan teknik pengumpulan data berbentuk soal (pernyataan) angket dan nilai rata-rata raport dengan menggunakan 20 orang siswa sebagai sampel. Pengujian yang dilakukan untuk membuktikan hipotesis dilakukan dengan analisis regresi linier sederhana, korelasi Pearson Product Moment dan uji-t. Hasil persamaan regresi yang didapatkan yaitu Y = 0,2634x + 68,519 dengan diperoleh nilai korelasi sebesar r = 0,693 dalam tingkat hubungan kuat, dan didapatkan hasil dari uji-t sebesar thitung = 4,080 dan ttabel = 2,100 artinya thitung ttabel pada = 0,05 maka korelasi antara variabel X dengan Y adalah signifikan, artinya terdapat hubungan yang kuat dan signifikan antara proses belajar daring masa pandemi Covid-19 dengan prestasi belajar IPA siswa kelas X SMA Negeri 2 Tondano
Identifikasi Mineral Pasir Tiga Warna Pantai Puntaru Kabupaten Alor-NTT
Get PDFPuntaru beach is famous for its three-colored sand that is mixed into one of them reddish-brown, black, and white sand. Research on the mineral composition of the tricolor sand has been conducted so that the use of three-colored sand is still done traditionally. This study aims to obtain information on the silica content and other mineral compositions of the three-colored sand of Puntaru Beach as initial data for further development. The three-color sand preparation process is carried out by the method of milling / crushing sand samples then sieving and washing with H2O. Stages of characterization of silica in three-colored sand were carried out using X-ray fluorescence (XRF), X-ray powder diffraction (XRD), and Fourier-transform infrared (FTIR). The analysis showed that the percentage of Si was the most dominant 45.28%, followed by Fe 25.94% and other minor elements. XRD results show that the three-colored sand contains quartz mineral (SiO2) identified at the main peak with 2 with in the 24.34 ° area. The black color of the sand is influenced by Fe content of 25.94% with hematite metal oxide (Fe2O3) 15.80% and reddish-brown influenced by the presence of sulfur (3.25%) in the form of mineral SO3 4.32%.
 
Karakterisasi Asap Cair Hasil Pirolisis Sampah Styrofoam Dengan Katalis Zeolite
Get PDFThe purpose this achieved in this research is 1.To get a few percent of liguid smoke products acquired from the pyrolysis of Styrofoam waste. 2.To know the effect of using zeolite in the waste pyrolysis process styrofoam to the speed of formation of liquid smoke product .3. To characterize the physical and chemical properties of liquid smoke from pyrolysis of syrofoam wast. The research method used to convert Styrofoam waste into liquid smoke is the pyrolisis method. For characterize of liquid smoke from pyrolysis using equipment: a set of pyrolysis tools, Fenske Viscometer Oswald, Picnometer, Boilling Point Meter and a set of KG-SM alloy. The results showed that the pyrolysis of 100 grams of Styrofoam wa ste using zeolite catalyst produced an average of 69,33% liquid smoke whereas the pyrolysis of Styrofoam waste without using a catalyst produces average 61,67 % liquid smoke. Time and temperature of pyrolysis have the same influence, the higher value, the more liquid smoke is produced. the length of ime for pyrolysis of styrofoam waste uing zeolite catalyst laste for 4,5 hours, while the pyrolysis of Styrofoam without a catalyst laste for 3,5 hours. Based of the physical ang chemical properties of liquid smoke, the pyrolysis of Styrofoam waste using a catalyst or without using a catalyst can both be classified into gasoline
Pengaruh Inkuiri Terbimbing Berbantuan Multimedia Interaktif Terhadap Kemampuan Kognitif Siswa Pada Materi Larutan Penyangga dan Sistem Koloid
Get PDFGuided inquiry learning model is a student centered learning model, namely stundents formulate problems, design experiments, collect and analyze data to make their own decision. In the study the guided inquiry learning model combined with iteractive multimedia, interactive multimedia is a fun and learning medium that supports educational development and plays an important role in chemical learnig activities which are still abstract in nature. This study aims to determine how the cognitive abilities of students after learning with guided inquiry assisted by interactive multimedia at SMA Negeri 1 kakas in the 2019/2020 school year. The population in this study was class XI IPA and the sample taken was class XI IPA 1 with a total of 25 students. The research instrument used was a test on students at the end of the lesson. The instrument in this study was a test of students cognitive abilities. Based on data analysis,in the buffer solution material there were 5 out of 25 students who did not reach the KKM standard and on the colloid system material there were 3 out of 25 students who did not reach the KKM standardModel pembelajaran Inkuiri Terbimbing adalah model pembelajaran yang berpusat pada siswa, yaitu siswa merumuskan masalah,mendesaina eksperimen,mengumpulkan dan menganalisis data sampai mengambil keputusan sendiri. Pada penelitian ini model pembelajaran inkuiri terbimbing dikombinasikan dengan multimedia interaktif, multimedia interakti merupakan media pembelajaran yang sifatnya menyenangkan yang menunjang perkembangan pendidikan dan berperan penting dalam kegiatan pembelajaran kimia yang masih bersifat abstrak. Penelitian ini bertujuan untukmengetahui bagaimana kemampuan kognitif siswa setelah pembelajaran dengan inkuiri terbimbing berbantuan multimedia interaktif di SMA Negeri 1 Kakas pada tahun ajaran 2019/2020. Populasi dalam penelitian ini adalah kelas XI IPA dan sampel yang diambil yaitu kelas XI IPA 1 dengan jumlah siswa sebanyak 25 orang. Instrumen penelitian yang digunakan berupa tes pada siswa diakhir pembelajaran. Instrumen pada penelitian ini berupa tes kemampuan kognitif siswa. Berdasarkan analisis data,pada materi larutan penyangga ada 5 dari 25 siswa yang tidak mencapai KKM dan pada materi sistem koloid ada 3 dari 25 siswa yang tidak mencapai standar KKM
Pengaruh Jenis Larutan Pemasak Terhadap Kualitas Pulp Daun Pisang
Get PDFThe need for paper continues to increase, indicating that there is an alternative wood material that can be used as a base for making pulp. Materials that can be used are dried banana leaves which contain cellulose. The quality of the pulp can be obtained by the characteristics of the pulp produced. This study was conducted to determine the effect of the type of solvents on the pulp quality of banana leaves. The pulp has been made using delignification process with addition of 3% NaOH or 3% Na2CO3 3% and heating up to 120 minutes, at 105 °C. Pulp quality was obtained from the results of pulp analysis, cellulose content, water content, physical appearances and qualitative analysis by FTIR. From the analysis of cellulose content, water content and FTIR instruments, pulp made with 3% NaOH solution are better suited to 3% Na2CO3 where the resulting pulp has a water content of 4.96%, a smooth and fibrous texture, a rich color, and produces a cellulose hydroxyl absorption band that is stronger than the pulp made of 3% Na2CO3. However, the pulp made from 3% NaOH solution has a lower yield (56.5%) and cellulose content (26.07%) than Na2CO3 3%. Dried banana leaves can be used as an alternative in pulp making.
Keywords: pulp making; banana leaves; solvent
Pembuatan dan Pengujian Pupuk Organik Cair (POC) dari Limbah Pasar dengan Menggunakan Bioaktivator EM4
Get PDFOrganic waste from market rubbish can be utilized as liquid organic fertilizer. In general, liquid organic fertilizers contain nutrients such as Nitrogen, Phosphorus, Potassium, and C-Organic that are needed by plants. The objective of this research are to manufacture liquid organic fertilizer through anaerobic fermentation from market rubbish with the addition of an EM4 bio activator and to determine the optimum time. The nutrients content were determined using the Kjeldahl method, UV-VIS Spectrophotometry, and Atomic Adsorption Spectroscopy. Liquid Organic Fertilizer that had the best quality among all types is from non-green vegetable. It has 0,45% of nitrogen, 0,08% of phosphorus, 0,34% of potassium, and 2,8% of C-organic respectively. The optimum time for POC fermentation occurred on the 14th day. The nutrient levels of all types of liquid organic ferilizer produced have not meet the minimum technical requirements of the quality of liquid organic fertilizers based on the Decree of the Minister of Agriculture of the Republic of Indonesia Number 261/Kpts/Sr.310/M/4/201
Analisis Kandungan Oksida Logam Clay Alam Kabupaten Pangkep Provinsi Sulawesi Selatan sebagai Bahan Dasar Pembuatan Keramik Berpori Gelcasting
No full textThe purpose of this study was to analyze the metal oxide content in natural clay in Pangkep Regency, South Sulawesi Province, which will be used as the basic material for making gelcasting porous ceramics. One of the basic ingredients for making ceramics is alumina silica metal oxide. This metal oxide is found in several minerals, one of which is clay minerals. The sample used in this study was natural clay in Pangkep Regency, South Sulawesi Province. The parameters studied were alumina silica content before and after natural clay was used in the synthesis of porous ceramics. The synthesis method used is the gelcasting method. The metal oxide content was analyzed using XRF and to observe the morphology of the ceramic body using SEM. The results showed that the metal oxide content for the main ceramic material in the form of alumina silica did not change significantly before and after sintering, Al2O3 was 11.98% before sintering and 11.32% after sintering while SiO2 content was 71.12% before sintering and 73.32% after sintering. It is supported by the results of the morphology of the ceramic body, natural clay that has undergone curing in the ceramic body