Combined Science (A) J250,09 Higher June 2018, OCR GCSE Past Papers with Mark Schemes

The exam paper comprises structured questions in chemistry, focusing on chemical bonding, reactions, and properties of substances. Topics include the periodic table, molecular and ionic bonding, balancing chemical equations, and energy changes in reactions. Advanced concepts like activation energy, exothermic reactions, and material properties (e.g., carbon nanotubes, polymers) are assessed. Practical applications include acid-base reactions, pH calculations, and experiment evaluations. Graphical interpretation and problem-solving skills are emphasized, with calculations on mole concepts, bond energies, and density comparisons. Historical atomic models, Rutherford’s experiment, and Bohr’s contributions are explored. Keywords: GCSE Chemistry, atomic structure, chemical reactions, material science, periodic trends.