Combined Science: Synergy > QUESTION PAPER (QP) > OCR Oxford Cambridge and RSA Wednesday 15 June 2022 — Morning GCSE (9—1) Combined Science B (Twe (All)

OCR Oxford Cambridge and RSA Wednesday 15 June 2022 — Morning GCSE (9—1) Combined Science B (TwentyFirst Century Science) J260/08 Combined Science (Higher Tier)

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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 75. • 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 24 pages. ADVICE • Read each question carefully before you start your answer. H *J26008* You must have: • a ruler (cm/mm) • the Data Sheet for GCSE (9-1) Combined Science B (inside this document) You can use: • an HB pencil • a scientific or graphical calculator *9001721171* Wednesday 15 June 2022 – Morning GCSE (9–1) Combined Science B (Twenty First Century Science) J260/08 Combined Science (Higher Tier) Time allowed: 1 hour 45 minutes 2 © OCR 2022 Answer all the questions. 1 Sundip observed her teacher reacting five different metals with water and dilute hydrochloric acid. (a) Suggest one safety precaution the teacher should have taken when demonstrating these reactions. ............................................................................................................................................. [1] (b) The table shows Sundip’s observations. Metal Reaction with water Reaction with dilute hydrochloric acid A lots of bubbles and fizzing fizzing and caught fire B no reaction no reaction C no reaction a few bubbles formed D caught fire explosion E one bubble formed lots of bubbles formed (i) Write the letters of the metals in the boxes to show the correct order of reactivity. The first one has been done for you. least reactive most reactive B [3] (ii) Sundip predicts that the bubbles given off by these reactions are hydrogen. To test for this she blows out a splint and places it at the top of the test tube used for each reaction. Will this test show whether the gas is hydrogen? Explain your answer. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ..................................................................................................................................... [2] (c) Sodium (Na) is a metal that reacts vigorously with hydrochloric acid (HCl ) to give off hydrogen (H2). Complete the balanced symbol equation for the reaction of sodium with hydrochloric acid. ….....… Na + ….....… HCl ….....… NaCl + H2 [3] 3 © OCR 2022 Turn over BLANK PAGE PLEASE DO NOT WRITE ON THIS PAGE 4 © OCR 2022 2 The diagram shows a food web from a garden. lettuce snail caterpillar hedgehog blackbird owl fox spider vole rabbit greenfly grasshopper grass (a) (i) Which two organisms from the list below are secondary consumers in the food web diagram? Tick (✓) two boxes. Greenfly Hedgehog Lettuce Owl Rabbit Spider [1] (ii) How many organisms are there in the longest food chain in the food web diagram? .......................................................... [1] 5 © OCR 2022 Turn over (iii) A disease reduced the number of caterpillars in the garden. What could happen to the number of snails in the garden? Explain your answer. Number of snails ............................................................................................................... ........................................................................................................................................... Explanation ....................................................................................................................... ..................................................................................................................................... [2] (b) One food chain from the garden food web is grass grasshopper vole fox On average the transfer of biomass between organisms is 10% efficient. The biomass of grass in the vole’s food chain is 37.5 kg. Calculate the expected biomass of voles in the food chain. Expected biomass of voles = .................................................... kg [2] 6 © OCR 2022 3 (a) James is looking at cells taken from the root tips of broad beans under a light microscope. The cells are shown in the image. (i) James counts 76 cells in the image. Calculate the percentage of cells undergoing mitosis in James’ image. Percentage = ..................................................... % [3] (ii) Suggest why James is looking at the cells in the root tips of the broad bean roots. ........................................................................................................................................... ..................................................................................................................................... [1] 7 © OCR 2022 Turn over (iii) Mitosis is the process of producing new cells so the broad bean plant can grow. Draw one line from each word to its correct description about mitosis and growth. Word Description Differentiation Cells in the bean plant that can form any type of cell. Interphase A group of bean cells that have the same function. Meristem cells The stage in the cell cycle before the bean cells begin mitosis. Tissue The process of newly formed bean cells becoming root hair cells. [3] (b) Meiosis is another form of cell division. Complete the sentences to explain the role of meiosis. Use the words and numbers. You can use each word and each number once, more than once or not at all. cells gametes genes nucleus 23 once tissues twice 46 Meiosis is a process where the cells divide ................................. . The cells produced are called ................................. . In humans these cells have ................................. chromosomes in preparation for fertilisation. [3] 8 © OCR 2022 4* The picture shows a goods lorry. When the lorry is empty, it has a mass of 1.45 × 104 kg. The lorry can carry a maximum load of 2.95 × 104 kg. The lorry is travelling at a velocity of 25 m / s on a motorway. Explain why the stopping distance of the lorry is different when the lorry is empty compared to when it is fully loaded. Include calculations in your answer. Use the equation momentum (kg m / s) = mass (kg) × velocity (m / s) and ideas about change in momentum in your answer. .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .................................................................................................................................................... [6] 9 © OCR 2022 Turn over BLANK PAGE PLEASE DO NOT WRITE ON THIS PAGE 10 © OCR 2022 5 (a) (i) Draw lines to connect each electrical component to its correct symbol. Electrical Component Symbol Diode Light dependent resistor (LDR) Thermistor Variable resistor [3] (ii) Sarah is planning to make a series circuit to investigate the effect of changing the temperature of a thermistor on the current and potential difference in the circuit. The diagram shows the circuit Sarah plans to use. A V Describe two improvements she needs to make to the circuit to get valid results. 1 ........................................................................................................................................ ........................................................................................................................................... 2 ........................................................................................................................................ ........................................................................................................................................... [2] 11 © OCR 2022 Turn over Sarah’s results at a constant room temperature can be seen in the table. Potential difference (V) Current (mA) 0.5 1.4 0.9 2.2 1.6 3.4 2.1 4.3 3.1 7.1 3.8 8.4 4.5 10.9 (iii) Plot Sarah’s results from the table and draw a line of best fit. The first two have been plotted for you. 0 0 2 4 6 8 10 12 1 3 5 7 9 11 1 2 3 4 Potential difference (V) Current (mA) 5 [3] 12 © OCR 2022 (b) Sarah repeated the experiment at different temperatures. She heated the thermistor in a water bath to increase the temperature. Which of these graphs shows how the resistance of the thermistor changes as the temperature increases? Tick (✓) one box. Resistance (Ω) Temperature (°C) Resistance (Ω) Temperature (°C) Resistance (Ω) Temperature (°C) Resistance (Ω) Temperature (°C) [1] 13 © OCR 2022 Turn over BLANK PAGE PLEASE DO NOT WRITE ON THIS PAGE 14 © OCR 2022 6 (a) Amir is planning an electrolysis investigation. (i) Which two substances could be separated by electrolysis? Tick (✓) two boxes. Diamond Graphite Lead bromide Potassium chloride Silicon dioxide [2] (ii) Amir uses a sodium chloride solution and wants to collect the gases given off at the electrodes. The diagram shows the equipment he plans to use. test tube beaker/ container NaCl solution carbon electrode connecting wire (DC) power supply Give two improvements Amir could make to his equipment. 1 ........................................................................................................................................ ........................................................................................................................................... 2 ........................................................................................................................................ ..................................................................................................................................... [2] 15 © OCR 2022 Turn over (iii) Name the gas formed at each electrode during the electrolysis of sodium chloride solution. Anode ................................................................................................................................ Cathode ............................................................................................................................. [2] (b) During the electrolysis of a molten ionic compound the reaction taking place at each of the electrodes is either oxidation or reduction. Write the balanced half equation for the reduction reaction in the electrolysis of molten sodium chloride. 2Na+ + ….....… ….....… [Show More]

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