Engineering Chemistry course for the first-year undergraduate students is designed to link theoretical concepts with their practical applications. The book is structured keeping in view the objective of the Engineering Chemistry course for the first semester students. It is strictly as per the syllabus of Anna University (affiliated colleges) regulation 2017. The book aims to impart an in-depth understanding of chemistry as applied to engineering. It deals with advanced and industrially useful topics, such as Water and its Treatment, Surface Chemistry and Catalysis, Alloys and Phase Rule, Fuels and Combustion and Energy Sources and Storage Devices.