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This study was conducted at the Chemistry Education Study Program, Faculty of Teacher Training and Education, Khairun University. This study aims to develop the GREATER-2T learning tool and its implementation to students' understanding of concepts in basic chemistry 1 course & teaching and learning strategies of chemistry. The population and sample in this study were all students of the chemistry education study program who programmed chemistry teaching and learning planning courses and chemical research methodology, the odd semester of the 2021/2022 academic year. Sample selection using saturated sampling technique. The method used in this research is research and development ( research and development ). The products to be developed are learning tools in the form of lecture program units (SAP), learning implementation plans (RPP), and teaching materials. The development model used by Plomp consists of 5 stages, namely: 1) initial investigation, (2) design, (3) realization/construction, (4) evaluation and revision, and (5) implementation. The research instruments were in the form of validation sheets for learning tools and teaching materials, student response assessment sheets, and concept mastery assessment instruments. Data analysis used descriptive and inferential analysis, using the SPSS software.

Tujuan dari penelitian ini untuk melihat pengetahuan laboratorium siswa kelas XI SMA se kecamatan Jailolo dan melihat perbedaan pengetahuan laboratorium kimia dari masing-masing sekolah SMA di kecamatan Jailolo. Jenis penelitian ini yaitu penelitian deskriptif dengan teknik pengambilan sampel menggunakan cluster sampling pada tahap pertama dan dilanjutkan dengan simple random sampling pada tahap kedua, metode pengumpulan data dengan menggunakan tes tertulis dan penyebaran angket. Hasil dari penelitian ini didapat bahwa pengetahuan laboratorium siswa SMA di kecamatan Jailolo berdasarkan konversi skala lima didapat 4 (17%) siswa dari SMA Negeri 1 Halmahera Barat yang masuk dalam kategori Sangat Tinggi sedangkan untuk SMA Swasta Islam Jailolo dan SMA Swasta Advent Pioneer Akediri tidak ada siswa yang termasuk dalam kategori sangat tinggi yaitu pada skor nilai 27 ke atas dan terdapat perbedaan pengetahuan Laboratorium kimia siswa kelas XI IPA di kecamatan Jailolo karena analisis Kruskall-Wallis mendapat nilai sig. 0,000 sehingga Ho ditolak dan Ha diterima.

The COVID-19 pandemic has forced major changes in the world of education. The application of social distancing to learning from home makes educators must be more creative in learning. The use of appropriate media in learning is very important to overcome these problems. One of the media used is android-based learning media. This research is continuation research of android application design in the subject of structure and function of amino acids and proteins. This research is limited to media validation. The instrument validation test stated that the instrument was valid with rcount greater than rtable at the number of N = 34 and a significance value of 5%. The reliability test of the validation instrument shows the rcount value of 0.880 and is greater than rtable 0.339 at the number of N = 34 and a significance value of 5%. The score of the questionnaire instrument was 3,196 obtained by averaging the scores from each category. It is in the range of 2.9-3.4 with a high category so that it can be interpreted that the application can be used as a learning media of the structure and function of the molecule.

Mathematical abilities are very important in building students' abilities in all aspects. Mathematical abilities are needed not only as numeracy skills but the ability to use mathematical logic in solving problems. Mathematical concepts are needed even for other scientific fields. This algebra concept electronic pocket book was created to help students during basic chemistry learning. The focus of the material chosen in basic chemistry learning is stoichiometry that applies algebraic concepts. This pocket book is useful for streamlining basic chemistry learning, especially on stoichiometry materials that use algebraic concepts in their operations. This algebra concept electronic pocket book has been tested on stoichiometric material. This book was tested on first semester students for basic chemistry courses.The test results on the first semester students showed a significance value of less than 0.05, which indicates that there was a difference in the average between group A and group B