Chemistry > QUESTION PAPER (QP) > OCR Oxford Cambridge and RSA Friday 27 May 2022 - Morning GCSE (9—1) Chemistry B (Twenty First Cen (All)

OCR Oxford Cambridge and RSA Friday 27 May 2022 - Morning GCSE (9—1) Chemistry B (Twenty First Century Science) J258/03 Breadth in Chemistry (Higher Tier) Time allowed: 1 hour 45 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 90. • The marks for each question are shown in brackets [ ]. • This document has 28 pages. ADVICE • Read each question carefully before you start your answer. *J25803* You must have: • a ruler (cm/mm) • the Data Sheet for GCSE (9–1) Chemistry B (inside this document) You can use: • an HB pencil • a scientific or graphical calculator Friday 27 May 2022 – Morning GCSE (9−1) Chemistry B (Twenty First Century Science) J258/03 Breadth in Chemistry (Higher Tier) Time allowed: 1 hour 45 minutes *8997957703* © OCR 2022 [601/8605/7] DC (CJ/CT) 300230/3 2 © OCR 2022 Answer all the questions. 1 Mia investigates the rate of reaction when zinc reacts with dilute sulfuric acid. She adds zinc pieces to dilute sulfuric acid at room temperature. Fig. 1.1 shows the apparatus she uses: Gas syringe Zinc Dilute sulfuric acid Fig. 1.1 (a) Complete the symbol equation for the reaction. Include a state symbol. Zn(s) + H2SO4(aq) ZnSO4(aq) + ..................... [2] (b) Mia measures the volume of gas in the gas syringe every two minutes. Fig. 1.2 shows a graph of her results: Volume (cm3) Time (minutes) 0 0 10 20 30 40 50 2 4 6 8 10 12 Fig. 1.2 3 © OCR 2022 Turn over (i) Calculate the rate of reaction during the first minute, using Fig. 1.2. Give your answer in cm3 / s. Rate of reaction = .............................................. cm3 / s [3] (ii) Explain why the mass of the flask and its contents decreases during the reaction. ........................................................................................................................................... ..................................................................................................................................... [1] 4 © OCR 2022 (c) Mia repeats the experiment at the same temperature. She adds a few drops of blue copper sulfate. Her results show that: • more gas is produced in the first minute, than in the first experiment. • the blue colour changes to colourless during the reaction. Mia makes a statement about the results: The results show that copper sulphate is affecting the rate but is not acting as a catalyst. Mia How do the results support Mia’s statement? Explain your answer. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [3] 5 © OCR 2022 Turn over (d) Mia repeats the experiment at a higher temperature. Which statements explain why the reaction is faster at a higher temperature? Tick (✓) two boxes. The particles move faster. There are more frequent collisions. The yield is higher at a higher temperature. The particles are closer together. The zinc breaks down into smaller pieces. [2] 6 © OCR 2022 2 The table shows some properties of metals, polymers and clay ceramics: Type of material Effect of force on material Electrical conductivity Hardness Metals malleable good hard Polymers flexible poor soft Clay ceramics snaps ........................................ ........................................ (a) Complete the table by adding the two missing properties of clay ceramics. [2] (b) Layla has three different water jugs. The jugs are made from aluminium, poly(ethene) and pottery (clay ceramic). Draw lines to connect each material with its correct property. Material Property of jug Softens easily when heated. Aluminium Goes out of shape if dropped. Poly(ethene) Breaks if dropped. Pottery Rusts quickly. [3] 7 © OCR 2022 Turn over (c) Poly(ethene) is made from ethene. Complete the equation by drawing the structure of the repeating unit of poly(ethene). C Ethene Poly(ethene) H H H H n C [1] (d) Genes are made from the natural polymer DNA. Which monomers make DNA? Tick (✓) one box. Cellulose Nucleotides Sugars Unsaturated hydrocarbons [1] 8 © OCR 2022 3 The Earth’s early atmosphere contained mostly carbon dioxide and water vapour. (a) As the Earth cooled, the oceans formed. Water vapour condensed from gas to liquid. The particle model can explain properties of gases and liquids. Which statement is correct? Tick (✓) one box. Liquids are difficult to squash because the particles are tightly packed. Gases have pressure because gas particles rarely collide with each other. Liquids expand when heated because atoms expand when heated. Gases are easy to squash because gas atoms get smaller when squashed. [1] (b) The particle model assumes molecules of water and carbon dioxide are inelastic spheres. This is a limitation of the particle model. Water changes state at 100 °C. Carbon dioxide changes state at –79 °C. Which statement explains another limitation of the particle model in relation to changes of state? Tick (✓) one box. In real life, all molecules are the same size. In real life, the molecules of water and carbon dioxide attract each other. In real life, molecules become smaller during evaporation. In real life, evaporation happens when bonds are broken in molecules. [1] (c) Gradually, plants began to grow on Earth. Explain how this affected the composition of the atmosphere. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [2] 9 © OCR 2022 Turn over (d) The graph shows how the percentage of carbon dioxide in the atmosphere has changed over time: Millions of years ago Percentage of carbon dioxide (%) 450 400 350 300 250 200 150 100 50 0 0.0 0.2 0.4 0.6 0.8 Ling and Ali discuss the graph: This graph shows that we don’t need to worry about carbon dioxide levels as they are much lower than they used to be. Carbon dioxide levels are still a Ling big problem. Ali Explain why Ling is wrong and Ali is correct. Ling ............................................................... [Show More]

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