OCR 2023 GCSE Combined Science Chemistry A Gateway Science J250/03: Paper 3 (Foundation Tier) Question Paper & Mark Scheme (Merged)

2 © OCR 2023 Section A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. 1 What is the part of the atom labelled X called? X A Core B Ion C Nucleus D Shell Your answer [1] 2 The table shows the properties of four different substances. Which substance is a metal? Substance Appearance at room temperature Melting point and boiling point Conducts heat? A green gas low no B colourless solid high no C shiny red-orange solid high yes D white solid high no Your answer [1] 3 © OCR 2023 Turn over 3 Which is an example of a neutralisation reaction? A A metal reacting with an acid B A non-metal reacting with oxygen C A salt dissolving in water D An acid reacting with an alkali Your answer [1] 4 Lead has a melting point of 328°C. Mercury has a melt