AQA GCSE COMBINED SCIENCE: TRILOGY 8464/C/1H Chemistry Paper 1H Version: 1.0 Final *JUN238464C1H01* IB/M/Jun23/E5 8464/C/1HQUESTION PAPER & MARKING SCHEME/ [MERGED] Marl( scheme June 2023

GCSE COMBINED SCIENCE: TRILOGY 8464/C/1H Chemistry Paper 1H Version: 1.0 Final *JUN238464C1H01* IB/M/Jun23/E5 8464/C/1H For Examiner’s Use Question Mark 1 2 3 4 5 6 7 TOTAL Monday 22 May 2023 Morning Time allowed: 1 hour 15 minutes 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. 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. Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. GCSE COMBINED SCIENCE: TRILOGY Higher Tier Chemistry Paper 1H H 2 *02* IB/M/Jun23/8464/C/1H Do not write outside the There are no questions printed on this page box DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED 3 *03* Turn over ► IB/M/Jun23/8464/C/1H Do not write outside the 0 1 box This question is about carbon dioxide. Carbon dioxide is soluble in water and forms an acidic solution. 0 1 . 1 Which ion makes the solution acidic? [1 mark] 0 1 . 2 Name an indicator that could be used to test if the solution is acidic. Give the result of the test. [2 marks] Indicator Result Question 1 continues on the next page 4 *04* IB/M/Jun23/8464/C/1H Do not write outside the Figure 1 shows the mass of carbon dioxide that will dissolve in 1 dm3 of water box at different temperatures. Figure 1 0 1 . 3 How does the solubility of carbon dioxide change as the temperature of the water increases? [1 mark] Tick () one box. The solubility decreases The solubility does not change The solubility increases 5 *05* Turn over ► IB/M/Jun23/8464/C/1H Do not write outside the 0 1 box . 4 Carbon dioxide dissolves in water to form an acidic solution. How does the pH of the solution change as the temperature of the water increases? Use Figure 1. [1 mark] Tick () one box. pH of the solution decreases pH of the solution does not change pH of the solution increases Calcium carbonate reacts with hydrochloric acid to produce carbon dioxide. The equation for the reaction is: CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + CO2(g) + H2O(x) 0 1 . 5 What is the state symbol (x) in the equation? [1 mark] Tick () one box. (aq) (g) (l) (s) Question 1 continues on the next page 6 *06* IB/M/Jun23/8464/C/1H Do not write outside the 0 1 box . 6 Figure 2 shows equipment a student used for an investigation. Figure 2 7 *07* Turn over ► IB/M/Jun23/8464/C/1H Do not write outside the box 12 The student investigated the volume of carbon dioxide produced when different masses of calcium carbonate react with hydrochloric acid. Describe a method the student could use. [6 marks] Turn over for the next question 8 *08* IB/M/Jun23/8464/C/1H Do not write outside the 0 2 box Lithium hydroxide reacts with sulfuric acid to produce lithium sulfate. The equation for the reaction is: 2 LiOH + H2SO4 → Li2SO4 + 2 H2O 0 2 . 1 What type of reaction is this? [1 mark] 0 2 . 2 Calculate the relative formula mass (Mr) of sulfuric acid (H2SO4). Relative atomic masses (Ar): H = 1 O = 16 S = 32 [2 marks] Relative formula mass (Mr) = 9 *09* Turn over ► IB/M/Jun23/8464/C/1H Do not write outside the box 10 0 2 . 3 Calculate the percentage by mass of oxygen in lithium sulfate (Li2SO4). Relative atomic mass (Ar): O = 16 Relative formula mass (Mr): Li2SO4 = 110 Give your answer to 2 significant figures. [4 marks] Percentage by mass of oxygen (2 significant figures) = % 0 2 . 4 A solution of lithium sulfate contains 0.30 g of lithium sulfate in 25 cm3. Calculate the concentration of lithium sulfate in g/dm3. [3 marks] Concentration = g/dm3 10 *10* IB/M/Jun23/8464/C/1H Do not write outside the 0 3 Sodium is in Group 1 of the periodic table. box Sodium reacts with oxygen to produce sodium oxide. 0 3 . 1 Balance the equation for the reaction. [1 mark] Na + O2 → Na2O 0 3 . 2 Explain what happens to sodium atoms and to oxygen atoms when sodium reacts with oxygen to produce sodium oxide (Na2O). Answer in terms of electrons