This research aimed to develop and measure the usability of the Augmented Reality App used for learning Chemistry, focusing on the concept of molecular geometry. AGILE model of development was employed to step by step development, starting from the analysis of the curriculum and need assessment, followed by design, development, deployment and evaluation. Some computer software such as Vuforia (database), unity (App generator) and blender (3D object maker) used at the development stage of the app. 17 students took part in the testing phase of the app. The students evaluated the ease of use of the app using the System Usability Scale (SUS). The SUS score of the app was 92,7, which means the app is easy to use, and most of them would recommend the app for other students. The result indicated that the app is user-friendly, light, and useful to learn the concept of molecular geometry.
This research aims to determine the effect of alkaline activation on the zeolite binding properties toward dissolved irons. Natural zeolite was activated by reflux using NaOH with various concentrations (2 N, 4 N, and 6 N). Furthermore, the activated zeolite was mixed into a solution of FeSO4.7H2O 0.5 M. Zeolite-Fe then characterised using FTIR, XRD, and SEM. The optimum contact time and the adsorption of irons by activated zeolite were studied. The result shows that alkaline activation in zeolite caused a change in structure zeolite as evidenced by FTIR spectra. The data from XRD result have also identified diffraction patterns of alkaline activated zeolites run into differences in the peak characteristics of their constituent and changing the degree of crystallinity of the mineral structure in zeolites. Besides, it also observed that NaOH activation of zeolites increased the amount of Fe bound to zeolite as evidenced by changes in colour and SEM results. The optimum contact time is 2 minutes and the adsorption kinetics of irons were fitted well with the pseudo-second-order kinetic model.
Telah dilakukan penelitian tentang pengembangan instrumen penilaian psikomotorik untuk praktikum kimia dasar di Lingkungan dan Laboratorium Pendidikan Kimia Fakultas Keguruan dan Ilmu Pendidikan (FKIP) Unsyiah. Penelitian ini bertujuan untuk mengembangkan dan mengetahui respon validator dan uji coba terbatas terhadap instrumen yang dikembangkan. Produk yang dihasilkan berupa instrumen penilaian dalam bentuk rubrik dengan skala 1-4. Penelitian ini terdiri atas tiga tahapan yaitu: 1) perencanaan; 2) pengembangan; dan 3) evaluasi. Hasil penelitian menunjukkan bahwa validasi instrumen menunjukkan persentase rerata sebesar 92,86% dengan kategori sangat layak. Sedangkan hasil respon angket dosen pengampu mata kuliah praktikum, asisten laboratorium, dan mahasiswa praktikan mendapatkan tanggapan sangat baik dengan persentase masing-masing sebesar 100%, 100%, dan 99,13%.
A biodegradable film made of taro starch and chitosan plasticized by castor oil was created through a casting solvent method. This study examined the influence of taro starch and chitosan composition on the thermo-mechanical and morphological properties of the film. We have successfully obtained a film with a smooth surface and compact structure of taro starch. The results showed that the higher proportion of chitosan in the polymer matrix succeeded in increasing the tensile strength and thermal stability of the film. The addition of chitosan into taro starch samples resulted in reducing the water uptake of the film. The film with a balanced ratio of taro and chitosan starch had excellent water resistance, its absorption of water is the lowest of all compositions.
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