AQA AQA GCSE CHEMISTRY 8462/2F Paper 2 Foundation Tier Version: 1.0 Final *JUN2384622F01* IB/M/Jun23/E15 8462/2FQUESTION PAPER & MARKING SCHEME/ [MERGED] Marl( scheme June 2023

AQA GCSE CHEMISTRY 8462/2F Paper 2 Foundation Tier Version: 1.0 Final *JUN2384622F01* IB/M/Jun23/E15 8462/2F For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 10 TOTAL Tuesday 13 June 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 Foundation Tier Paper 2 F 2 *02* IB/M/Jun23/8462/2F 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/Jun23/8462/2F Do not write outside the 0 1 box This question is about oxygen. Scientists think that there was little or no oxygen in the Earth’s early atmosphere. 0 1 . 1 Which planet today has an atmosphere that is similar to the Earth’s early atmosphere? [1 mark] Tick () one box. Jupiter Mars Neptune Saturn 0 1 . 2 Which is the approximate percentage of oxygen in the Earth’s atmosphere today? [1 mark] Tick () one box. 20% 50% 80% 100% Question 1 continues on the next page 4 *04* IB/M/Jun23/8462/2F Do not write outside the box 0 1 . 3 Which two of the following increased the percentage of oxygen in the Earth’s atmosphere? [2 marks] Tick () two boxes. Active volcanoes emitted gases Algae and plants evolved Animals evolved Carbonate sediments formed in oceans Photosynthesis took place 5 *05* Turn over ► IB/M/Jun23/8462/2F Do not write outside the 0 1 box . 4 Some scientists think that 1100 million years ago the Earth’s atmosphere contained: • 16% oxygen • 4% carbon dioxide. Complete Figure 1. You should: • complete the y-axis scale • plot the percentage of oxygen in the Earth’s atmosphere 1100 million years ago. [2 marks] Figure 1 Question 1 continues on the next page 6 *06* IB/M/Jun23/8462/2F Do not write outside the Oxygen is produced when manganese dioxide is added to hydrogen peroxide box solution. The equation for the reaction is: hydrogen peroxide → water + oxygen A student investigated the effect of changing the temperature on the decomposition of hydrogen peroxide. This is the method used. 1. Add 5 cm3 of hydrogen peroxide solution to three test tubes labelled A, B and C. 2. Place each test tube in a water bath at a different temperature. 3. Add 0.2 g of manganese dioxide to each test tube. Figure 2 shows the results. Figure 2 7 *07* Turn over ► IB/M/Jun23/8462/2F Do not write outside the 0 1 box . 5 Which test tube contained hydrogen peroxide solution at the highest temperature? [1 mark] Tick () one box. Test tube A Test tube B Test tube C 0 1 . 6 The student tested the gas produced. What is used to prove that the gas is oxygen? [1 mark] Tick () one box. A glowing splint Bromine water Damp litmus paper 0 1 . 7 Manganese dioxide does not appear in the chemical equation for this reaction. Which is a correct statement about manganese dioxide in this reaction? [1 mark] Tick () one bo