2025 GCSE (9–1) Chemistry A (Gateway Science) J248/04 (Higher Tier) (Verified Question Paper With Mark Scheme Combined June 2025)

Friday 13 June 2025 – Morning GCSE (9–1) Chemistry A (Gateway Science) J248/04 (Higher Tier) Time allowed: 1 hour 45 minutes (Verified Question Paper With Mark Scheme Combined June 2025) INSTRUCTIONS •Use black ink. You can use an HB pencil, but only for graphs and diagrams. •Write your answer to each question in the space provided. If you need extra space use the lined page at the end of this booklet. The question numbers must be clearly shown. •Answer all the questions. •Where appropriate, your answer should be supported with working. Marks might be given for using a correct method, even if your answer is wrong. INFORMATION •The total mark for this paper is 90. •The marks for each question are shown in brackets [ ]. •Quality of extended response will be assessed in questions marked with an asterisk (*). •This document has 28 pages. ADVICE •Read each question carefully before you start your answer. Section A You should spend a maximum of 30 minutes on this section. Write your answer to each question in the box provided. 1Which row in the table shows the change in the percentage of each gas in the Earth’s atmosphere today compared to the Earth’s early atmosphere? Carbon dioxide Oxygen A decreased decreased B decreased increased C increased decreased D increased increased Your answer [1] 2An iron nail is left in a test tube containing water. Iron nail Water The iron nail rusts. Which graph shows how the mass of the iron nail changes? A Mass 0 0 Time B Mass 0 0 Time C Mass 0 0 Time D Mass 0 0 Time Your answer [1] 3The alkanes are a homologous series of molecules. Which statement about different alkane molecules is correct? AThe molecular formula of the molecules differs by CH3. BThe molecules all contain a double bond. CThe molecules all have the same general formula. DThe molecules all have the same physical properties. Your answer [1] 4Which row in the table shows a property of a Group 1 metal and of a transition metal? Group 1 metal Transition metal A forms white compounds low density B high melting point conducts electricity C low density forms coloured compounds D very reactive low density Your answer [1] 5The theoretical yield of a product in a reaction is 71 g. The actual yield is 60 g. What is the percentage yield? A 15.5% B 18.3% C 84.5% D 118.3% Your answer [1] 6Which type of bond is found in butene? ACovalent BElectrostatic CIonic DMetallic Your answer [1] 7Which equation shows the relationship between: •the mass of a solute •the volume of a solution •the concentration of the solution? concentration of solution volume of solution Bconcentration of solution = mass of solute Cvolume of solution = concentration of solution Dconcentration of solution = volume of solution Your answer [1] 8What is a disadvantage of a hydrogen/oxygen fuel cell? AElectricity is generated directly from the reaction. BGreenhouse gases are not produced. CHydrogen gas is produced from hydrocarbons. DThere are no moving parts. Your answer