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All Journal Jurnal Kimia (Journal of Chemistry) TRANSPUBLIKA INTERNATIONAL RESEARCH IN EXACT SCIENCES (TIRES)
Devi Wisudawan
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Mathematics Physics

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INTERKALASI TETRAETIL ORTOSILIKAT (TEOS) PADA LEMPUNG TERAKTIFASI ASAM SULFAT DAN PEMANFAATANNYA SEBAGAI ADSORBEN WARNA LIMBAH GARMEN P. Suarya; A. A. Bawa Putra; Devi Wisudawan
Jurnal Kimia (Journal of Chemistry) Vol. 4, No. 1 Januari 2010
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (135.786 KB)

Abstract

Interchalation of Tetraethyl orthosilicate (TEOS) with acid activated clay has been studied. As forcharacterization of the modified clay. Acid-base titration methode was used to determine the surface acidity.Methylen blue method was used to determine the surface area while spectrophotometer UV-Vis was used todetermine the amount of dye adsorbted by the modified clay.The results showed that activation of clay with sulphuric acid and interchalat ion with TEOS increased thesurface acidity of the clay. The value of surface acidity of S0-0(without activation); Sa-0(interchalated with TEOS 0%);Sa-5 (interchalated with TEOS 5%); Sa-10(interchalated with TEOS 10%); Sa-15 (interchalated with TEOS 15%) were0.5064; 0.8733; 0.8486; 1.0005; and 0.8926 mmol/gadsorbent respectively. The specific surface area of S0-0; Sa-0; Sa-5;Sa-10; Sa-15 were27.2391 m2/g; 28.4019 m2/g; 28.2767 m2/g; 29.2220; m2/g dan 29.1621 m2/g, respectively. Furthermore, it was shown that, acid actived clay interchalated with 10% TEOS was the best adsorbent which adsorbed83,64% of the dye indicated by the change of the colour from dark yellow to light yellow.
THE EFFECT OF INTEGRATED CHEMISTRY PRACTICE LEARNING IMPLEMENTATION ON STUDENT LEARNING OUTCOMES Wisudawan, Devi
TRANSPUBLIKA INTERNATIONAL RESEARCH IN EXACT SCIENCES Vol. 1 No. 2 (2022): APRIL
Publisher : Transpublika Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1206.544 KB) | DOI: 10.55047/tires.v1i2.147

Abstract

This research aims to determine the effect of integrated chemistry practice implementation on student learning outcomes. This research is a quasi-experimental and unbalanced control experiment design. The population for this research was students in class X for the academic year 2020/2021, totaling 165 students divided into six classes of 24-29 students each. A random sample of 58 pupils from the population was drawn and divided into two classes using a random sampling procedure. The test is included into the data collection procedure utilized in this investigation. Analyze the prerequisites using the normality and homogeneity tests. The descriptive statistical analysis and t-test were utilized to analyze the data for the one-party Separated variant model. The outcomes of the analysis are given a significance level of 5%. The findings reveal that, students who complete comprehensive exercises using integrated practicum approaches achieve higher basic chemistry learning values when compared to students who complete cooperative learning in chemistry (control classes). Integrated practice learning approaches, as demonstrated here, have a significant influence on the educational accomplishment of students at SMK PGRI 3 Malang.
Co-Authors A. A. Bawa Putra P. Suarya