Engineering Chemistry Materials, Energy and Environment provides a comprehensive introduction to chemical principles and their practical relevance across engineering disciplines. The book covers foundational chemistry, water treatment, electrochemistry, corrosion, fuels, energy storage, polymers, composites, smart materials, nanotechnology, environmental chemistry, green chemistry, and sustainable waste management. Each chapter combines clear explanations with industrial applications, numerical problems, case studies, review questions, and project activities. Designed for engineering students, the book connects scientific fundamentals with contemporary technologies such as lithium-ion batteries, hydrogen systems, advanced materials, pollution-control methods, recycling, and circular economy practices.