Article Per Year (5 Year)
p-Index From 2020 - 2025
0
P-Index
This Author published in this journals
All Journal Jurnal Penelitian Saintek Jurnal Inovasi Pendidikan IPA
Crys Fajar Partana
Universitas Negeri Yogyakarta
Agriculture, Biological Sciences & Forestry Decision Sciences, Operations Research & Management Education Mathematics

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
SYNTHESIS DIBENZIL IS REGISTERED THROUGH THE POLYMERIZED POLYMERYLENE AS ALTERNATIVE RECYCLE PLASTIC RECYCLE Suwardi Suwardi; Crys Fajar Partana; Agus Salim
Jurnal Penelitian Saintek Vol 10, No 1: April 2005
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7275.627 KB) | DOI: 10.21831/jps.v10i1.5552

Abstract

Synthesis  dibenzyl terephathalate were done through PET softdrinkbottles   degradation   by   refluxing   in   benzyl   alcohol   at   14~C temperature for 20, 24. and 28 hours in the presence  of zinc acetate catalyst. The result of degradation was purified  by recristalization in methanol and then melting point  (mp), FTIR, I H NMR spectra, and TLC spot were determined. The melting point of product degradation.for   28   hours  was  98-99  "c.  Based   FTIR  spectra   known  thatcompounds  of  product   degradation  have   OH,  C=O,  C-O,  CH,monosubstituted benzene, disubstituted benzene groups,  while on IH NMR spectra showed chemical shift at 8.2 ppm  (s, IO H of monosubtituted benzene), 7.5 ppm (s, 9 H consist of 4 H disubstituted benzene and 5 H of aromatic benzyl alcohol), 5.4 ppm  (s, 1 H from OH benzyl alcohol), 4.8 ppm (s, 4 H of methylene), and 2.9 ppm (s. 7H of other traces). The single spot ofTLC plate indicated that productdegradation for  28 hours might be a single compound. Based these characterization  concluded  that  compound  of product  degradation was dibenzyl terephthalate contains benzyl alcohol and other traces.
Pengaruh penggunaan media pembelajaran berbasis android terhadap kemampuan pemecahan masalah kimia Arina Diana Fatma; Crys Fajar Partana
Jurnal Inovasi Pendidikan IPA Vol 5, No 2: October 2019
Publisher : Faculty of Mathematics and Natural Sciences, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jipi.v5i2.26035

Abstract

Penelitian ini bertujuan untuk menghasilkan media pembelajaran berbasis android dan mengidentifikasi peningkatan kemampuan pemecahan masalah kimia siswa. Prosedur penelitian pengembangan diadaptasi dari pengembangan ADDIE, terdiri dari lima tahap: analisis, desain, pengembangan, penerapan, dan evaluasi. Validasi produk dilakukan oleh ahli media dan ahli materi. Penilaian produk dilakukan oleh 5 guru kimia, 20 siswa untuk uji coba kelompok kecil, dan 56 siswa untuk uji coba lapangan. Evaluasi uji lapangan dilakukan untuk menentukan pengaruh media pembelajaran berbasis android terhadap kemampuan pemecahan masalah kimia. Instrumen yang digunakan dalam penelitian ini meliputi kuisioner penilaian media dan soal tes. Kuisioner penilaian diberikan kepada ahli media, ahli materi, guru, dan siswa. Soal tes diberikan kepada siswa setelah proses pembelajaran selesai. Hasil penelitian menunjukkan bahwa media pembelajaran berbasis android yang dikembangkan dapat meningkatkan kemampuan pemecahan masalah kimia siswa SMA. Learning with android application to improve chemical problem-solving ability AbstractThis research aimed to produce an Android-based learning media and to identify improvement in students' chemistry problem-solving ability. The development research procedure were adapted from the ADDIE development, consist of five phases: analysis, design, development, implementation, and evaluation. Product validations were conducted by media experts and material experts. The product assessment were conducted by five chemistry teachers and 20 students for small group trials. The product evaluations were conducted by 56 students for field trials. Field test evaluations were carried out to determine the effect of android-based learning media on the ability to solve chemical problems. The instruments used in this study include media assessment questionnaires and test questions. Assessment questionnaires are given to media experts, material experts, teachers, and students. Test questions are given to students after the learning process is complete. The results showed that the Android-based learning media developed can improve chemical problem-solving ability of high school students.
Co-Authors Agus Salim Arina Diana Fatma Suwardi Suwardi