Combined Science (A) J250,09 Higher November 2020, OCR GCSE Past Papers with Mark Schemes

The June 2020 OCR Science GCSE Paper 9 focuses on key chemistry concepts, including reaction energetics, electrolysis, and stoichiometry. Topics covered include covalent and ionic bonding, atomic structure, pH curves, and acid-base neutralization. Students are assessed on their ability to interpret energy profiles, calculate moles, and write balanced chemical equations. Practical applications such as preparing pure salts, analyzing perfume compositions, and evaluating the properties of diamond and chlorine are included. Keywords: GCSE Chemistry, reaction energetics, electrolysis, bonding, stoichiometry, pH, neutralization, material properties.