The exam paper addresses foundational chemistry concepts and their applications. Key topics include water purification, the role of catalysts, properties of hydrocarbons, the Haber process, and the greenhouse effect. It examines polymer production, corrosion of metals, and practical techniques like fractional distillation and identifying ions. Emphasis is placed on chemical reactions, energy changes, and environmental chemistry, including renewable fuels and atmospheric composition. Practical skills are tested through data interpretation, experimental design, and calculations involving reaction rates, molar relationships, and material properties. Keywords: water purification, hydrocarbons, Haber process, polymers, corrosion, catalysts, fractional distillation, environmental chemistry, reaction rates.