Foundations of Chemistry is a free, open-source textbook designed for Grade 9 and 10 students worldwide. Created by Ethiopian student and educator Zemen G/egzabher, this book offers a complete chemistry curriculum with clear explanations, extensive visual support, real-life applications, interdisciplinary links, experiments, and embedded practice exercises. Every topic is presented with step-by-step clarity, supported by original diagrams, 3D molecular models, and infographics created by the author. The book is designed to work in classrooms and for independent learners, including those in underserved settings with limited resources. This First Edition was developed using AI-assisted drafting under full human editorial control. Published under a CC BY-NC-SA 4.0 license, it is free to share and adapt for non-commercial educational purposes.