E-Learning Development on Basic Chemical Law Materials in Senior High School (SMA/MA) to Improve High Order Thinking Skill Ability

This research aims to develop e-learning for learning Chemistry, Law of Basic Chemistry, for Senior High Schools (SMA/MA). The method used is Borg and Gail. E learning product development using the Moodle 3.75 application. The stage in the development of this research is the contentA voltammetric sensor was developed using multiwalled carbon nanotubes (MWCNTs) paste electrode based zinc/aluminium-layered double hydroxide-clopyralid for simultaneous determination of dopamine (DA), acetaminophen (ACT), and bisphenol A (BPA). Several experimental conditions such as percent of modifier, pH of the solution, and square wave voltammetry parameters were optimized. The effective surface area of the electrodes was determined by chronocoulometry studies. The sensor demonstrated a linear plot of 7.0 × 10-6 – 5.0 × 10-4 M for DA, 3.0 × 10-5 – 5.0 × 10-4 M for ACT, and 3.0 × 10-6 – 5.0 × 10-4 M for BPA, with detection limit of 1.7 × 10-7 M, 1.8 × 10-7 M, and 1.4 × 10-7 M respectively. The interferences from 10 to 40-fold concentration of ascorbic acid, sodium salicylate, glucose, sucrose, glutamic acid, and captopril were negligible. The electrode also applicable for DA, ACT, and BPA determination in urine, pharmaceutical tablets, and plastic products samples with recoveries between 92.3 % and 109.7 %. and construct validity of the product being developed. The result obtained is an e-learning product of Basic Chemistry Laws which has very high content and construct validity. From the results of the content validation, it was obtained 0.98 each for Guidelines and information; 0.88 for Content / material; and 0.87 for Evaluation. From this section, it can be seen that the content validity has a very high interpretation. From the results of the construct validity includes guidance and information; Program Performance; and Systematics, Aesthetics and Design principles respectively 0.84; 0.84; and 0.76. This section looks very high, except for the systematic, aesthetic and design aspects which are still in the high category. These results conclude that e-learning products have very high validity to be used as learning materials for Chemistry in Senior High Schools (SMA) and Madrasah Aliyah (MA), especially in the material of Basic Chemistry Laws.