The GCSE Chemistry J248/02 (June 2019) paper focuses on environmental chemistry, reaction rates, and material properties. Section A assesses foundational knowledge on water types, transition metals, hydrocarbons, and catalytic effects. Section B explores topics such as rust prevention, fractional distillation, the Haber process, and global warming. Key areas include reaction mechanisms, equilibrium, nanoparticle applications, and life-cycle assessments. The paper emphasizes practical applications, critical evaluation of data, and environmental sustainability, enhancing analytical skills and understanding of chemistry in real-world contexts.