This research is a descriptive study that describes the learning of chemistry during the Covid-19 pandemic. The respondents in this study were 127 high school students from the West Java and Banten provinces. A Google Form questionnaire was used to collect the data. The results showed that the most widely used online class applications were WhatsApp Group feature, Google Classroom, and Zoom. Students also used printed textbooks, e-books, and student worksheets as learning media. Students did laboratory practice at home using easily found tools and materials. However, a small portion of the respondents ( 11 %) used materials purchased from a chemical store, and another small portion of the respondents ( 14 %) used virtual laboratories. They reported the results of their practice by making a laboratory practice report as well as through video activities and Microsoft PowerPoint for presentation. Students learn from home with varying durations. Most students experienced obstacles during the learning process so that they prefer learning face-to-face in class as usual. Therefore, the teacher must prepare a variety of strategies for distance learning so that the students can learn chemistry from home with fun. Some strategies that can be applied are providing audio-visual learning media or computer/android-based games for chemistry, using the online class application that accommodates interactions similar to face-to-face learning, providing laboratory practice using tools and materials that can be easily found around the house, providing virtual lab application, and providing more opportunities for students to ask questions about chemistry topics that they do not understand.

In Indonesia, STEM education has been implemented in the learning process since 2014. The number of researches on the implementation of STEM education are increasing from year to year. Therefore, this research was conducted to map the all articles published online with the theme of STEM education implementation in Indonesia. The scoping review was carried out following the framework from Arksey & O'Malley (2005), with the following steps: (1) formulating research questions, (2) exploring research results on Google Scholar database from 2015-2020 with the keyword “implementation” + "STEM education" + “Indonesia”, (3) sorting the collected articles with predetermined criteria and selecting them according to the PRISMA model, (4) discussion, and (5) conclusion. Found 597 articles that match to these keywords and 154 articles that meet the criteria as research data. The results showed that the STEM education is implemented as a learning strategy and approach, integrated with other learning models, used as a learning assessment, and developed into teaching materials, modules, and learning media. Additionally, teachers implement STEM to improve entrepreneurship skills, learning motivation, and various 21st-century skills in their students. Furthermore, research on STEM has been conducted in 19 provinces in Indonesia, which are dominated by West Java and East Java provinces. Beside that, the STEM education has been studied at all levels of education and high school is the most widely used research subject and STEM education has grown in small units and has proven to be capable of developing many student skills. The implementation of STEM education can be a trigger for renewal in the world of education.

Students' creative thinking skills are needed in chemistry learning, because some chemistry is contextual. Students' creative thinking skills in Indonesia tend to be low. This research aimed to improve students' creative thinking skills on the concept of colloids by implementing the PBL model. This research used the pre-experimental method with pretestposttest one group design. The sample in this research was all students in one class of XI IPA taken using purposive sampling method. The instrument was used containing 10 valid and reliable essay questions. Data collection techniques were carried out through tests and observation sheets. Data analysts was done descriptively and statitically including n-gain and one sample t test. The results showed that the n-gain value with the medium category on 5 indicators of students' creative thinking skills namely, fluency indicator (0.45), flexibility (0.50), authenticity (0.47), decomposition (0.50), reformulation (0.58). These results were supported with one sample t test obtaining a significance value of 0,00 <0,05 which indicated that H 1 was accepted and H 0 was rejected. From the results of this research, it could be seen that the application of the PBL model might improve students' creative thinking skills on the concept of colloids. The implication of this research was needed for a Problem based learning module that will be able to stimulate students' creative thinking skills.

The utilization of rice husk ash as an adsorbent has not been studied even though it has been used in various purposes. Therefore, it is important to research on the reaction rate absorption capacity of the adsorbent rice husk ash. By seen the chemical kinetics of rice husk, a study was identified the character of rice husk ash on its absorption capacity. The research was conducted by testing methods to two kinetics adsorption equations i.e Langmuir and Freundlich on changes in NaOH concentration. The experimental results show that process of absorption NaOH follows the Langmuir and Freundlich equations with r equal to 0.973. The suitable equation for determining the maximum adsorption capacity is to follow the Langmuir equation. The optimum concentration of NaOH adsorbed by active rice husk ash is 22,163 mg/L with an adsorption capacity of 4,433 mg/g.

Pembelajaran bermakna dalam kimia perlu memperhatikan karakter konten kimia dan peserta didik. Problem Based Learning (PBL) memberikan lingkungan belajar yang erat kaitannya dengan kehidupan sehari-hari sehingga dapat mendukung tercapainya pembelajaran  kimia yang bermakna bagi peserta didik. Penelitian ini bertujuan untuk mendeskripsikan keaktifan, kreativitas dan prestasi belajar kimia siswa pada implementasi problem based learning (PBL) untuk topik struktur atom. Penelitian ini merupakan penelitian best practice yang dilakukan di kelas X MIPA disalah satu SMA di kota Serang. Penelitian ini menggunakan metode kuantitatif deskriptif. Instrumen penelitian terdiri dari lembar observasi keaktifan siswa, lembar penilaian proyek dan 30 soal tes struktur atom. Analisis data dilakukan dengan mengkonversi skor penilaian kedalam nilai persentase kelas dan selanjutnya dikategorisasikan. Hasil penelitian menunjukkan bahwa rata-rata 78% siswa aktif selama pembelajaran dan kreativitas siswa terukur dalam kategori tinggi dengan skor rata-rata 78. Implementasi PBL juga memberikan pengaruh pada peningkatan prestasi belajar kimia siswa yang lebih baik dibandingkan pembelajaran sebelumnya.