AQA GCSE CHEMISTRY 8462/1H Paper 1 Higher Tier Version: 1.0 Final *JUN2384621H01* IB/M/Jun23/E15 8462/1H QUESTION PAPER & MARKING SCHEME/ [MERGED]

AQA GCSE CHEMISTRY 8462/1H Paper 1 Higher Tier Version: 1.0 Final *JUN2384621H01* IB/M/Jun23/E15 8462/1H For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 10 TOTAL Monday 22 May 2023 Morning Time allowed: 1 hour 45 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. Do not write outside the box around each page or on blank pages. • 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 100. • 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 CHEMISTRY Higher Tier Paper 1 H 2 *02* IB/M/Jun23/8462/1H Do not write outside the 0 1 Discoveries in chemistry led to a better understanding of atomic structure. box 0 1 . 1 Atoms were originally thought to be tiny spheres that could not be divided. The plum pudding model of the atom was then developed. Figure 1 represents the plum pudding model of the atom. Figure 1 Describe the plum pudding model of the atom. [2 marks] 0 1 . 2 Atoms contain electrons, neutrons and protons. Write these three particles in order of their discovery. [1 mark] Earliest Latest 3 *03* Turn over ► IB/M/Jun23/8462/1H Do not write outside the Very few atoms of the element tennessine (Ts) have ever been identified. box The atomic number of tennessine is 117 0 1 . 3 Predict the number of outer shell electrons in an atom of tennessine. Give one reason for your answer. Use the periodic table. [2 marks] Number of outer shell electrons Reason 0 1 . 4 Tennessine was first identified by a small group of scientists in 2010. Suggest one reason why tennessine was not accepted as a new element by other scientists until 2015. [1 mark] Question 1 continues on the next page 4 *04* IB/M/Jun23/8462/1H Do not write outside the 0 1 box . 5 The discovery of isotopes explained why some relative atomic masses are not whole numbers. Element R has two isotopes. Table 1 shows the mass numbers and percentage abundances of the isotopes of element R. Table 1 Mass number Percentage abundance (%) 6 7.6 7 92.4 Calculate the relative atomic mass (Ar) of element R. Give your answer to 1 decimal place. [3 marks] Relative atomic mass (1 decimal place) = 9 5 *05* Turn over ► IB/M/Jun23/8462/1H Do not write outside the Turn over for the next question box DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED 6 *06* IB/M/Jun23/8462/1H Do not write outside the 0 2 box This question is about temperature changes. A student investigated the change in temperature of a solution when different masses of ammonium nitrate were dissolved in water. This is the method used. 1. Measure 200 cm3 of water into a polystyrene cup. 2. Measure the temperature of the water. 3. Add 4.0 g of ammonium nitrate to the water. 4. Stir the solution until all the ammonium nitrate has dissolved. 5. Measure the lowest temperature reached by the solution. 6. Repeat steps 1 to 5 with different masses of ammonium nitrate. 0 2 . 1 Give the independent variable and the dependent variable in the investigation. [2 marks] Independent variable Dependent variable Table 2 shows the results. Table 2 Mass of ammonium nitrate added in grams Lowest temperature of solution in ºC 4.0 18.2 8.0 16.2 12.0 15.2 16.0 13.6 20.0 12.4 24.0 10.6 7 *07* Turn over ► IB/M/Jun23/8462/1H Do not write outside the 0 2 box . 2 Plot the data from Table 2 on Figure 2. Draw a line of best fit. [3 marks] Figure 2 0 2 . 3 Determine the initial temperature of the water. You should extend your line of best fit on Figure 2. [2 marks] Initial temperature of the water = °C 0 2 . 4 How do the results show that dissolving ammonium nitrate in water is endothermic? [1 mark] 8 *08* IB/M/Jun23/8462/1H Do not write outside the The student repeated the experiment three more times. box Table 3 shows the results for 8.0 g of ammonium nitrate. Table 3 Trial 1 Trial 2 Trial 3 Trial 4 Mean Lowest temperature of solution in ºC 16.2 16.6 16.8 16.4 16.5 0 2 . 5 The student recorded the mean lowest temperature of the solution for 8.0 g of ammonium nitrate as 16.5 ± 0.3 ºC. Explain why the student included ± 0.3 ºC after the mean lowest temperature. [2 marks] 0 2 . 6 What type of error is shown by the results in Table 3? [1 mark] Tick () one box. Random error Systematic error Zero error 11 9 *09* Turn over ► IB/M/Jun23/8462/1H Do not write outside the 0 3 This question is about making a soluble salt. box 0 3 . 1 Plan a method to make pure, dry crystals of zinc chloride from zinc carbonate and a dilute acid. [6 marks] 0 3 . 2 Name two other substances that can each be reacted with a dilute acid to make zinc chloride. Do not refer to zinc carbonate in your answer. [2 marks] 1 2 8 10 *10* IB/M/Jun23/8462/1H Do not write outside the 0 4 box This question is about hydrogen and compounds of hydrogen. Figure 3 shows the displayed formulae for the reaction between hydrogen and chlorine. Figure 3 Table 4 shows the bond energies. Table 4 Bond Bond energy in kJ/mol 0 4 . 1 Which expression shows how to calculate the overall energy change for the reaction in Figure 3? Use Table 4. [1 mark] Tick () one box. 436 + 346 + 432 kJ/mol 436 + 346 + (2 × 432) kJ/mol 436 + 346 − 432 kJ/mol 436 + 346 − (2 × 432) kJ/mol 11 *11* Turn over ► IB/M/Jun23/8462/1H Do not write outside the The reaction between hydrogen and chlorine is exothermic. box 0 4 . 2 Explain why this reaction releases energy to the surroundings. [2 marks] 0 4 . 3 Figure 4 shows part of a reaction profile for the reaction between hydrogen and chlorine. Complete the reaction profile in Figure 4. You should: • label the activation energy • label the overall energy change. [3 marks] Figure 4 Question 4 continues on the next page 12 *12* IB/M/Jun23/8462/1H Do not write outside the 0 4 box . 4 Draw a dot and cross diagram for a molecule of hydrogen chloride (HCl). Show the outer shell electrons onl