Chemistry 7405/3 June 2021

AQA A Level Chemistry (7405) Jun 2021

معلم موافق رایگان بودن است.

The exam evaluates advanced chemistry topics, emphasizing practical and theoretical applications. Topics include titration of sodium ethanedioate with potassium manganate(VII), polyester synthesis, and ligand substitution in iron complexes. Analytical techniques such as thin-layer chromatography for amino acid identification and purification of ketone derivatives are assessed. Reaction mechanisms include nucleophilic addition with cyanides and Group 7 reactions. Equilibrium questions address buffer solutions and Kc calculations. Additional areas cover organic synthesis, propanoic acid yield calculations, and isomer identification using NMR and IR spectroscopy. The paper integrates quantitative problem-solving, experimental techniques, and data analysis across chemistry domains.