Combined Science (A) J250,03 Foundation June 2019, OCR GCSE Past Papers with Mark Schemes

The past paper evaluates foundational chemistry concepts, including physical and chemical changes, stoichiometry, atomic structure, and chemical bonding. It covers the periodic table, reactions (e.g., neutralization, combustion, and decomposition), empirical and molecular formulas, and states of matter. Key areas include practical applications like chromatography, thermal energy changes, and the reactivity series. Keywords such as “relative atomic mass,“ “ionic and covalent bonding,“ “melting point,“ “exothermic vs. endothermic,“ and “neutralization reaction“ dominate, reflecting the exam’s emphasis on applied chemistry and critical thinking in experimental contexts.