Chemistry 7404 Paper 2 June 2020, AQA AS-Level Past Papers with Mark Schemes

AQA AS Level Chemistry (7404) Jun 2020

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The exam emphasizes organic and physical chemistry, addressing reaction mechanisms, thermodynamic calculations, and molecular properties. Key topics include nucleophilic substitution in halogenoalkanes, elimination reactions for alkenes, and isomeric distinctions. Practical applications involve percentage yield, atom economy in synthesis, and Kc expressions for equilibria. Analytical tasks explore structural formulas, intermolecular forces, and energy changes in polymerization. Quantitative evaluations focus on enthalpy of formation, calorimetry, and gas laws. Trends in molecular interactions, stereochemistry, and hydrocarbon combustion are examined, emphasizing theoretical understanding and experimental accuracy. Sustainability considerations are integrated through biofuel analysis and atom economy optimization.