<![CDATA[The topic of reaction rates encompasses concepts of reaction rates, collision theory, factors affecting reaction rates, as well as rate equations and reaction orders that involve abstract concepts and mathematical calculations. Mastering this material requires flexible, engaging, and accessible independent learning resources outside regular classroom hours. The social media platform Instagram serves as a viable medium because it integrates dynamic visual content, infographics, and instructional videos into a single accessible interface. This study aims to develop and validate an Instagram-based independent learning resource on reaction rates for Phase F senior high school students. The study employed Educational Design Research (EDR) utilizing the Plomp development model, limited to the expert review and one-to-one evaluation stages to produce Prototype III. The research subjects consisted of three Chemistry lecturers from UNP, two chemistry teachers, and three students from SMAN 1 Salimpaung. Data were collected using needs analysis questionnaires, expert validation sheets, and one-to-one evaluation sheets, which were subsequently analyzed using Aiken’s V index. The results demonstrate that the developed learning resource is categorized as valid, achieving a content validity index of V = 0.92 and a construct validity index of V = 0.91. The one-to-one evaluation indicated that the media was perceived as very clear, engaging, and easy to operate, although low-ability students still required additional guidance on mathematical calculation problems. In conclusion, this Instagram-based independent learning resource is feasible and ready for broader trials to facilitate autonomous chemistry learning. ABSTRAK Materi laju reaksi mencakup konsep laju reaksi, teori tumbukan, faktor-faktor yang memengaruhi laju reaksi, serta persamaan dan orde reaksi yang sarat akan pemahaman abstrak dan kalkulasi matematis. Untuk mendukung penguasaan materi tersebut, diperlukan sumber belajar mandiri yang fleksibel, menarik, dan mudah diakses kapan saja oleh peserta didik di luar jam tatap muka. Media sosial Instagram menjadi platform yang potensial karena mampu mengintegrasikan konten visual dinamis, infografis, dan video pembelajaran dalam satu wadah. Penelitian ini bertujuan untuk mengembangkan dan memvalidasi sumber belajar mandiri materi laju reaksi berbasis Instagram untuk peserta didik Fase F SMA/MA. Jenis penelitian yang digunakan adalah Educational Design Research (EDR) dengan model Plomp, yang dibatasi hingga tahap expert review dan one-to-one evaluation untuk menghasilkan Prototipe III. Subjek penelitian terdiri atas tiga orang dosen Kimia UNP, dua orang guru kimia, dan tiga orang peserta didik SMAN 1 Salimpaung. Data dikumpulkan melalui angket analisis kebutuhan, lembar validasi ahli, dan lembar one-to-one evaluation, kemudian dianalisis menggunakan indeks Aiken’s V. Hasil penelitian menunjukkan bahwa sumber belajar mandiri yang dikembangkan dinyatakan valid dengan indeks validitas konten V=0,92 dan validitas konstruk V=0,91. Hasil one-to-one evaluation menunjukkan bahwa media ini dinilai sangat baik, mudah dipahami, menarik, serta praktis digunakan, meskipun peserta didik dengan kemampuan kognitif rendah masih memerlukan pendalaman pada soal perhitungan stoikiometri laju reaksi. Dengan demikian, sumber belajar mandiri berbasis Instagram ini layak digunakan sebagai media alternatif untuk mendukung pembelajaran mandiri peserta didik pada materi laju reaksi. ]]>
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