Remazol is a reactive dye that is widely used in the textile industry with functional groups that can be well covalently bonded to textile fibres, but difficult to decompose, carcinogenic, and harmful to the health and ecosystems. This study specifically aims to analyse the adsorption power of activated carbon on three types of Remazol dyes using batch experiment method as an effective way to reduce the concentration of these dyes in textile industry wastewater. Using activated carbon with the same treatment, Remazol Red dye had the best interaction and was adsorbed in the highest amount on the activated carbon surface (125.16 mg/g), followed by Remazol Blue (16.23 mg/g) and finally Remazol Black dye (11.07 mg/g). The three adsorption processes that occur are in accordance with the Langmuir adsorption isotherm model, with color removal percentage of 74.4 % (Remazol Red), 49.5 % (Remazol Blue), and 48.1 % (Remazol Black). These results are in accordance with the structural studies conducted on the three types of Remazol synthetic dyes, in which Remazol Black with the bulkiest structure has the weakest physical interaction with carbon atoms on the activated carbon surface thus absorbed in the least amount on the adsorbent surface.

Good facilities, effective and efficient chemical laboratory management must be applied so that chemistry practicum activities can be carried out properly. Previous research has shown that the management of chemical laboratories in several high schools has not been carried out properly, so it is necessary to conduct this study at SMA Negeri 1 Tapaktuan, South Aceh. The purpose of this study was to determine the effectiveness of chemical laboratory management at SMA Negeri 1 Tapaktuan, South Aceh. This research was conducted qualitatively accompanied by descriptive analysis. Subjects in this study; principal, person in charge/head of chemical laboratory, laboratory staff and chemistry teacher. Collecting data by observation, interviews and documentation. Next, the research results are classified into 4 aspects of laboratory management which consist of planning, organizing, implementing and monitoring which are divided into 28 criteria. The results obtained are the management of the chemistry laboratory which is well implemented 75%, less good 10.72% and not good 14.28%. The conclusion of this study is that the chemical laboratory management at SMA Negeri 1 Tapaktuan South Aceh has not been effective because it has not reached 80% of all aspects of chemical laboratory management.

The Covid-19 pandemic has changed our activities, including activities in the learning process. Previously, the learning process was carried out directly in the classroom, but the pandemic has changed into online learning such as e-learning. The implementation of e-learning in schools should be followed by an analysis of the level of e-learning readiness (ELR). This study aims to determine the readiness level of State Senior High Schools (SMA Negeri) Banda Aceh, namely SMA Negeri 1, SMA Negeri 3 and SMA Negeri 4. The method used in this study was descriptive qualitative with the number of research subjects as many as 94 students and 2 teachers in each school. The instrument used in this study was a questionnaire compiled and validated based on the Aydin & Tasci ELR model. The results showed that the three schools obtained ELR scores respectively, SMA Negeri 1 () = 3.53, SMA Negeri 3 () = 3.54. The score showed that these schools are ready but need a few improvements in applying e-learning at school. Aspects that must be improved are humans, technology, innovation, and development.

The use of local culture in the community can be used as a source of learning science in schools. This is one of the characteristics of the 2013 curriculum. However, the availability of local culture-oriented or ethnoscience-oriented chemistry books is not yet available in several schools in Pekalongan. This research aims to develop an ethnoscience-oriented chemical enrichment book by raising the typical food culture of Pekalongan. This research uses the Research and Development (R & D) method and the ADDIE (Analyze, Design, Development, Implement, and Evaluate) model. Data collection techniques use interviews, validation, and questionnaires. The results of data validation processing used the Guttman scale, and the response data used a Likert scale. This study produced an ethnoscience-oriented chemical enrichment book by raising the typical food culture of Pekalongan consisting of 5 special food items and 7 chemical materials and validation by 4 validators with a percentage of 100% from material experts and 93.33% from media experts. In addition, the responses of teachers and students of SMA Islam YMI and SMA PGRI 2 Kajen were obtained with an average percentage of 90.25% from teachers and 88.54% from students. Thus, this book is included in the very good category and is suitable for use as additional chemical teaching materials. Keywords: enrichment book; ethnoscience; typical Pekalongan food