AQA 2022// GCSE COMBINED SCIENCE: TRILOGY Foundation Tier Chemistry Paper 2F

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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 Foundation Tier Chemistry Paper 2F F 2 *02* IB/M/Jun22/8464/C/2F 0 1 This question is about the Earth’s atmosphere. 0 1 . 1 The Earth’s atmosphere contains 21% oxygen. Draw the bar for oxygen on Figure 1. [1 mark] Figure 1 0 1 . 2 What is used to test for oxygen gas? [1 mark] Tick () one box. A burning splint A glowing splint Damp litmus paper Limewater Do not write outside the box 3 *03* Turn over ► IB/M/Jun22/8464/C/2F Do not write outside the The Earth’s early atmosphere was very different from the Earth’s atmosphere today. box Figure 2 shows the composition of the Earth’s early atmosphere and of the Earth’s atmosphere today. Figure 2 0 1 . 3 The percentages of nitrogen and oxygen in the Earth’s atmosphere today are different from the Earth’s early atmosphere. Complete the sentences. Choose answers from the box. Use Figure 2. Each answer can be used once, more than once or not at all. [2 marks] decreased increased stayed the same Since the Earth’s early atmosphere, the percentage of nitrogen in the Earth’s atmosphere has . Since the Earth’s early atmosphere, the percentage of oxygen in the Earth’s atmosphere has . 4 *04* IB/M/Jun22/8464/C/2F Do not write outside the 0 1 box . 4 The Earth’s atmosphere today contains a small amount of carbon dioxide. Why has the percentage of carbon dioxide decreased since the Earth’s early atmosphere? [2 marks] Tick () two boxes. Dissolved in oceans Formation of sedimentary rocks Industrialisation Respiration Volcanic activity 5 *05* Turn over ► IB/M/Jun22/8464/C/2F Do not write outside the box 9 Oxides of nitrogen are produced when nitrogen reacts with oxygen in car engines. Figure 3 shows the concentration of oxides of nitrogen in the atmosphere during one day in a city. Figure 3 0 1 . 5 Which two times have the highest concentrations of oxides of nitrogen in the atmosphere? [2 marks] 1 2 0 1 . 6 Suggest why there are the highest concentrations of oxides of nitrogen at these times. [1 mark] 6 *06* IB/M/Jun22/8464/C/2F Do not write outside the box 0 2 This question is about fuels. Coal deposits were formed from the remains of trees. 0 2 . 1 Name the process in the leaves of trees that uses carbon dioxide. [1 mark] 0 2 . 2 How is coal formed after trees die? [1 mark] Tick () one box. The trees are burned. The trees are compressed. The trees are melted. Coal contains small amounts of sulfur. 0 2 . 3 Name the gas produced when sulfur burns in oxygen. [1 mark] 0 2 . 4 Give two problems caused by the gas produced when sulfur burns in oxygen. [2 marks] 1 2 7 *07* Turn over ► IB/M/Jun22/8464/C/2F Do not write outside the box 8 0 2 . 5 Figure 4 shows the relative amount of electricity generated from different fuel sources in the UK from 2012 to 2018. Figure 4 Describe what happens to the amounts of fuels used to generate electricity in the UK from 2012 to 2018. [3 marks] Turn over for the next question 8 *08* IB/M/Jun22/8464/C/2F Do not write outside the box 0 3 This question is about ammonia and its compounds. A student heated a sample of ammonium chloride. The equation for the reaction is: NH4Cl ⇌ NH3 + HCl ammonium chloride ammonia 0 3 . 1 One product is ammonia. What is the name of the product with the formula HCl? [1 mark] 0 3 . 2 Ammonia is a gas. What is the state symbol for ammonia? [1 mark] Tick () one box. (aq) (g) (I) (s) 0 3 . 3 How does the equation show that the reaction is reversible? [1 mark] 0 3 . 4 Complete the sentence. [1 mark] The forward reaction is endothermic, so the reverse reaction is . 9 *09* Turn over ► IB/M/Jun22/8464/C/2F Do not write outside the box 0 3 . 5 Complete the sentence. Choose the answer from the box. [1 mark] concentration rate temperature Equilibrium is reached when the forward and reverse reactions happen at exactly the same . Question 3 continues on the next page 10 *10* IB/M/Jun22/8464/C/2F Do not write outside the The industrial process to produce ammonia uses a catalyst. box 0 3 . 6 Figure 5 shows the reaction profile for the reaction with and without a catalyst. Figure 5 Which letter represents the activation energy for the reaction with a catalyst? [1 mark] Tick () one box. A B C D 11 *11* Turn over ► IB/M/Jun22/8464/C/2F Do not write outside the box 8 0 3 . 7 Give one reason why using a catalyst reduces costs. Do not answer in terms of activation energy. [1 mark] 0 3 . 8 Ammonia is in a mixture that is used as a household cleaner. What is a mixture that has been designed as a useful product called? [1 mark] Turn over for the next question 12 *12* IB/M/Jun22/8464/C/2F Do not write outside the box 0 4 A student investigates the effect of concentration on the rate of the reaction between sodium thiosulfate solution and hydrochloric acid. Figure 6 shows the experiment. The experiment was done in a fume cupboard. [Show More]

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