Chemistry 7404 Paper 1 June 2019, AQA AS-Level Past Papers with Mark Schemes

AQA AS Level Chemistry (7404) Jun 2019

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The exam emphasizes inorganic and physical chemistry concepts, including atomic structure, periodic trends, and chemical bonding. Topics include ion sizes, electronegativity, and bond enthalpy calculations. Analytical techniques such as time-of-flight mass spectrometry and isotopic abundance are explored. Quantitative tasks address equilibrium constants, molar mass determination of diprotic acids, and percentage uncertainties in experimental titrations. Reaction mechanisms involve oxidation-reduction equations and Group 2 reactivity trends. Practical applications include magnesium-based titanium extraction, heat transfer in combustion, and distinguishing compounds via chemical tests. Theoretical knowledge is assessed through electron configurations, ionization energy patterns, and molecular geometry with lone pairs.