2023 AQA GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Question Paper & Mark scheme (Merged) June 2023 [VERIFIED]

2023 AQA GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Question Paper & Mark scheme (Merged) June 2023 [VERIFIED] Materials For this paper you must have: • a ruler • a scientific calculator • the periodic table (enclosed). Instructions • Use black ink or black ball-point pen. • Pencil should only be used for drawing. • Fill in the boxes at the top of this page. • Answer all questions in the spaces provided. • If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s). • Do all rough work in this book. Cross through any work you do not want to be marked. • In all calculations, show clearly how you work out your answer. For Examiner’s Use Question Mark 1 2 3 4 5 6 TOTAL Information • The maximum mark for this paper is 70. • The marks for questions are shown in brackets. • You are expected to use a calculator where appropriate. • You are reminded of the need for good English and clear presentation in your answers. *JUN238464C2H01* IB/M/Jun23/E7 8464/C/2H 2 There are no questions printed on this page DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED *02* IB/M/Jun23/8464/C/2H Do not write outside the box 3 0 1 The combustion of fuels is a source of atmospheric pollutants. 0 1 . 1 Methane is a fuel. Balance the equation for the combustion of methane. [1 mark] CH4 + O2 → CO2 + H2O 0 1 . 2 Many fuels are mixtures. Petrol and diesel are mixtures of hydrocarbons. Table 1 shows properties of petrol and of diesel. Table 1 Petrol Diesel Range of number of carbon atoms in 4 to 12 12 to 20 a hydrocarbon molecule Range of boiling points in °C 40 to 205 250 to 350 Compare the properties of petrol and diesel. Use Table 1. Do not write outsiide the box *03* [2 marks] Turn over ► IB/M/Jun23/8464/C/2H 4 0 1 . 3 The gases released when a fuel is burned in car engines may include: • oxides of nitrogen • carbon monoxide • water vapour. Which chemical element do all these gases contain? [1 mark] Tick () one box. Carbon Hydrogen Nitrogen Oxygen 0 1 . 4 When diesel burns in car engines, oxides of nitrogen are produced. Where does the nitrogen come from? [1 mark] 0 1 . 5 When diesel burns, particulates may be produced. What environmental effect do particulates from burning diesel cause? [1 mark] Do not write outside the box *04* IB/M/Jun23/8464/C/2H 5 0 1 . 6 Carbon monoxide may be produced when diesel burns. Give one reason why carbon monoxide is difficult to detect. [1 mark] 0 1 . 7 Explain why water vapour and not liquid water is produced when diesel burns. [2 marks] 0 1 . 8 Sulfur is a common impurity in diesel. Explain why this causes an environmental problem. Do not write outside the box *05* [3 marks] Turn over ► IB/M/Jun23/8464/C/2H 12 6 0 2 Chromatography is used to separate mixtures. Chromatography involves a mobile phase and one other phase. 0 2 . 1 What is the other phase in chromatography? [1 mark] Tick () one box. Moving phase Recycled phase Stationary phase Viscous phase 0 2 . 2 Why do the substances in the mixture separate in the mobile phase? [1 mark] 0 2 . 3 How many spots will be produced on the chromatogram of a pure compound? [1 mark] Number of spots = Do not write outside the box *06* IB/M/Jun23/8464/C/2H 7 0 2 . 4 In a chromatography experiment, a blue colour moved 4.77 cm. The solvent moved 5.30 cm. Calculate the Rf value for the blue colour.