Combined Science (A) J250,04 Foundation June 2019, OCR GCSE Past Papers with Mark Schemes

The document is a GCSE (9–1) Combined Science (Chemistry) A past paper, covering fundamental chemistry concepts. Key topics include reaction rates, the reactivity series, periodic trends, reversible reactions, and chemical equilibria. It assesses understanding of organic chemistry (alkanes, fractional distillation), environmental chemistry (sulfur dioxide, greenhouse gases), and practical skills in experiment design and data interpretation. Emphasis is placed on applying theoretical knowledge, such as calculating densities, balancing equations, and interpreting graphical data. The questions demand analytical thinking and problem-solving, focusing on foundational concepts like intermolecular forces, atomic structure, and chemical bonding.