OCR Oxford and RSA Monday 20 June 2022 — Morning GCSE (9—1) Combined Science (Chemistry) A (Gateway Science) J250/04 Paper 4 (Foundation 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 pag... es 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 24 pages. ADVICE • Read each question carefully before you start your answer. Monday 20 June 2022 – Morning GCSE (9–1) Combined Science (Chemistry) A (Gateway Science) J250/04 Paper 4 (Foundation Tier) Time allowed: 1 hour 10 minutes *J25004* *8994703457* © OCR 2022 [601/8687/2] DC (MB/CGW) 300264/7 You must have: • a ruler (cm/mm) • the Data Sheet for GCSE (9–1) Combined Science (Chemistry) A (inside this document) You can use: • a scientific or graphical calculator • an HB pencil 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 Supplies of crude oil are running out. Which word describes crude oil? A Finite B Renewable C Reusable D Sustainable Your answer [1] 2 A student heats four different metals using a Bunsen burner. The table shows their observations. Metal Observation when metal is heated W bursts into flames X slowly goes dull Y no reaction Z glows brightly What is the order of reactivity of the metals from most reactive to least reactive? A W, X, Z, Y B W, Z, X, Y C Y, X, Z, W D Z, Y, W, X Your answer [1] 3 © OCR 2022 Turn over 3 A teacher investigates the rate of reaction between magnesium and dilute hydrochloric acid. The diagram shows the equipment they use. Trough of water Dilute hydrochloric acid Conical flask Magnesium X What is the name of the piece of equipment labelled X? A Burette B Gas syringe C Measuring cylinder D Test tube Your answer [1] 4 Nitrogen, N2, reacts with hydrogen, H2, to make ammonia, NH3. N2 + 3H2 2NH3 What is the name of this type of reaction? A Combustion B Electrolysis C Neutralisation D Reversible Your answer [1] 4 © OCR 2022 5 Which toxic gas is produced from burning fossil fuels? A Carbon dioxide B Carbon monoxide C Nitrogen D Oxygen Your answer [1] 6 Alkanes are hydrocarbons with the formula CnH2n+2. Which compound is an alkane? A C6H8 B C7H12 C C8H16 D C9H20 Your answer [1] 7 A student has four different solids. • One of the solids is a catalyst. • The student tests 1g of each solid in a chemical reaction. The table shows the student’s observations for each solid. Solid Observation Mass of the solid at the end of the reaction (g) A disappears 0 B fizzes and disappears 0 C changes colour 1 D same colour 1 Which solid is the catalyst? Your answer [1] 5 © OCR 2022 Turn over 8 The diagram shows the fractional distillation of crude oil. Crude oil X The table shows the boiling point ranges of four different fractions. Fraction Boiling point range (°C) A below 20 B 20–80 C 180–260 D 260–320 Which fraction is collected at X? Your answer [1] 6 © OCR 2022 9 A student investigates the rate of reaction between magnesium and an excess of dilute sulfuric acid. Which graph shows how the rate of reaction changes with time? Time Time Rate of reaction A Time Rate of reaction B Rate of reaction C Time Rate of reaction D Your answer [1] 7 © OCR 2022 Turn over 10 In the UK, one person produces about 9.5 × 103 kg of carbon dioxide per year. One tree can take in 15kg of carbon dioxide per year. Approximately how many of these trees are needed to reduce one person’s yearly carbon dioxide output to zero? A 15 B 650 C 1600 D 140000 Your answer [1] 8 © OCR 2022 SECTION B Answer all the questions. 11 The diagram shows how the composition of the Earth’s atmosphere has changed over time. Water vapour and other gases Earth’s early atmosphere Earth’s atmosphere today Carbon dioxide Nitrogen Oxygen Water vapour and other gases (a) What produced the gases present in the Earth’s early atmosphere? Tick (3) one box. Earthquakes Thunderstorms Volcanoes [1] (b) What is the percentage of oxygen in the Earth’s atmosphere today? ............................................................................................................................................. [1] 9 © OCR 2022 Turn over (c) The amounts of carbon dioxide and water vapour in the Earth’s early atmosphere decreased over time. Draw lines to connect each gas with the correct description of how it decreased over time. Gas How it decreased over time Condensed to form the oceans Carbon dioxide Reacted with bacteria Water vapour Reacted with metals in rocks Absorbed by plants during photosynthesis [2] (d) The Earth’s atmosphere today contains gases from Group 0 in the Periodic Table. (i) The table shows the amounts of the gases from Group 0 in the Earth’s atmosphere today. Gas Amount of gas (%) Helium 0.000524 Neon 0.00182 Argon 0.934 Krypton ................................ The total amount of the gases from Group 0 is 0.938%. Complete the table by calculating the exact amount of krypton in the Earth’s atmosphere today. Write your answer in the box in the table. [2] (ii) What is a property of the Group 0 gases? Tick (3) one box. They are coloured. They are unreactive. They exist as molecules [Show More]

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