OCR 2023 Chemistry B H433/01: Fundamentals of chemistry A Level Question Paper & Mark Scheme (Merged)

2 OCR 2023 Section A You should spend a maximum of 40 minutes on this section. Write your answer to each question in the box provided. 1 Which row is correct for the properties of substances with the bonding types shown? Bonding type Melting point Electrical conductivity Solid Molten A covalent network low poor poor B ionic high good good C metallic high poor good D simple molecular low poor poor Your answer [1] 2 Helium-4 is formed by a nuclear fusion reaction. 2 3He 4He + .................... 2 2 What is needed to complete the equation? A 1 electron B 1 neutron C 1 proton D 2 protons Your answer [1] 3 Your answer [1] OCR 2023 Turn over 3 Which molecule is the most polar? A CCl 4 B CF4 C CHF3 D CHCl 2F Your answer [1] 4 One of the principles of green chemistry in industrial processes involves the use of a selective catalyst. Which of the following makes a selective catalyst ‘green’? A It speeds up the process. B It improves the atom economy. C It minimises the use of organic solvents. D It reduces energy usage and minimizes waste product.