OCR 2023 GCSE CHEMISTRY A (GATEWAY SCIENCE) J248/01: PAPER 1 (FOUNDATION TIER) QUESTION PAPER & MARK SCHEME (MERGED

2 © OCR 2023 Section A You should spend a maximum of 30 minutes on this section. Write your answer to each question in the box provided. 1 Where is most of the mass found in an atom? A Electrons B Neutrons C Nucleus D Protons Your answer [1] 2 Sodium fluoride has the formula NaF. The formula of the sodium ion is Na+ . What is the formula of the fluoride ion? A F + B F – C F 2+ D F 2– Your answer [1] 3 Which row of results shows that the pH of a solution is acidic? pH Universal indicator colour A 3 orange B 10 blue C 3 blue D 10 orange Your answer [1] 3 © OCR 2023 Turn over C B A D 4 Thomson discovered the first sub-atomic particle. Which sub-atomic particle did Thomson discover? A Atom B Electron C Neutron D Proton Your answer [1] 5 What is the relative formula mass of iron chloride, FeCl 3? Relative atomic mass (Ar ): Cl = 35.5 Fe = 55.8.