Chemistry > QUESTION PAPER (QP) > OCR Oxford and RSA Friday 27 May 2022 — Morning GCSE (9—1) Combined Science (Chemistry) A (Gatew (All)

OCR Oxford and RSA Friday 27 May 2022 — Morning GCSE (9—1) Combined Science (Chemistry) A (Gateway Science) J250/09 Paper 9 (Higher Tier) Time allowed: 1 hour 10 minutes

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INSTRUCTIONS • Use black ink. You can use an HB pencil, but only for graphs and diagrams. • Write your answer to each question in the space provided. If you need extra space use the lined page... s at the end of this booklet. The question numbers must be clearly shown. • Answer all the questions. • Where appropriate, your answer should be supported with working. Marks might be given for using a correct method, even if your answer is wrong. INFORMATION • The total mark for this paper is 60. • The marks for each question are shown in brackets [ ]. • Quality of extended response will be assessed in questions marked with an asterisk (*). • This document has 20 pages. ADVICE • Read each question carefully before you start your answer. Friday 27 May 2022 – Morning GCSE (9–1) Combined Science (Chemistry) A (Gateway Science) J250/09 Paper 9 ( Higher Tier) Time allowed: 1 hour 10 minutes © OCR 2022 [601/8687/2] DC (LK/CT) 300255/6 2 © OCR 2022 SECTION A Answer all the questions. You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. 1 A molecule of glucose has the molecular formula C6H12O6. What is the empirical formula of glucose? A CHO B CH2O C C6H12O6 D (CO)6H12 Your answer [1] 2 The equation shows the reaction between carbon dioxide, CO2, and hydrogen, H2. CO2 + H2 CO + H2O What has been reduced in this reaction? A CO B CO2 C H2 D H2O Your answer [1] 3 © OCR 2022 Turn over 3 Which statement describes the isotopes of an element? A Atoms that have different numbers of protons but the same number of electrons. B Atoms that have different numbers of protons but the same number of neutrons. C Atoms that have the same number of protons but different numbers of electrons. D Atoms that have the same number of protons but different numbers of neutrons. Your answer [1] 4 Which substance is an example of a formulation? A A macromolecule B A metal C An alloy D An ionic compound Your answer [1] 4 © OCR 2022 5 The diagram shows a chromatogram produced by paper chromatography. Solvent front Base line 15 cm 10cm What is the Rf value? A –10 B –5 C 0.67 D 1.5 Your answer [1] 6 The table shows some information about four different acids. Acid Number of particles per cm3 of acid solution Degree of ionisation (%) A high 1 B low 1 C high 100 D low 100 Which acid is a dilute solution of a strong acid? Your answer [1] 5 © OCR 2022 Turn over 7 The ionic equation shows the reaction of chlorine, Cl 2, with sodium bromide, NaBr. Cl 2 + 2Na+ + 2Br – Br2 + 2Na+ + 2Cl – What is the simplest ionic equation for this reaction? A Cl 2 + 2NaBr Br2 + 2NaCl B Cl 2 + Na+ + Br – Br2 + Na+ + Cl – C Cl 2 + Br – Br2 + Cl – D Cl 2 + 2Br – Br2 + 2Cl – Your answer [1] 8 The diagram shows the reaction of hydrogen, H2, and oxygen, O2, to make water, H2O. H H H H + O O H H O H H O The energy required to break all the H–H and O=O bonds is 1368 kJ / mol. The energy change for the reaction is –484 kJ / mol. What is the bond energy for the O–H bond? A 463 kJ / mol B 884 kJ / mol C 926 kJ / mol D 1852 kJ / mol Your answer [1] 6 © OCR 2022 9 A solution has a pH of 3. The solution is diluted with water by a factor of 1000. What is the pH of the solution after dilution? A 2 B 4 C 5 D 6 Your answer [1] 10 What is the definition of the mole? A One mole contains 1 g of atoms. B One mole contains 6.022 × 1023 particles. C One mole is equal to the relative atomic mass of an element. D One mole is the number of atoms contained in one molecule. Your answer [1] 7 © OCR 2022 Turn over BLANK PAGE PLEASE DO NOT WRITE ON THIS PAGE 8 © OCR 2022 SECTION B Answer all the questions. 11 Fullerenes are allotropes of carbon that have many uses. Fig. 11.1 shows a molecule of a fullerene. Fig. 11.1 (a) (i) Which group of allotropes contain this fullerene? Tick one (✓) box. Inorganic Organic Physical [1] (ii) What is the approximate size of a molecule of this fullerene? Tick one (✓) box. 1 × 10–15 m 1 × 10–10 m 1 × 10–5 m [1] 9 © OCR 2022 Turn over (b) The carbon atoms in fullerenes are joined by covalent bonds. (i) Explain how two atoms of carbon form a covalent bond. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ..................................................................................................................................... [2] (ii) How many covalent bonds does one atom of carbon form in a molecule of fullerene, as shown in Fig. 11.1? ..................................................................................................................................... [1] (c) The model used to show the molecule of fullerene in Fig. 11.1 has limitations. The table shows some statements about the model. Which statements about this model are true, and which are false? Tick one (✓) box in each row. True False It shows the length of the covalent bonds. It shows the size of the carbon atoms. It shows the three-dimensional shape of the molecule. [2] 10 © OCR 2022 (d) Fullerenes can be used as lubricants. Lubricants reduce the friction between moving parts. Fig. 11.2 shows a lubricant being sprayed onto the chain of a motorbike. Fig. 11.2 (i) Explain why fullerenes can be used as lubricants. Use ideas about the structure and bonding of the fullerene shown in Fig. 11.1 in your answer. .......................................................................... [Show More]

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