OCR 2023 GCSE Combined Science B Twenty First Century Science J260/06: Chemistry (Higher Tier) Question Paper & Mark Scheme (Merged)

OCR 2023 GCSE Combined Science B Twenty First Century Science J260/06: Chemistry (Higher Tier) Question Paper & Mark Scheme (Merged) COMBINED SCIENCE B Please write clearly in black ink. Do not write in the barcodes. Centre number Candidate number First name(s) Last name Oxford Cambridge and RSA Monday 22 May 2023 – Morning GCSE (9–1) Combined Science B (Twenty First Century Science) J260/06 Chemistry (Higher Tier) Time allowed: 1 hour 45 minutes 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 pages 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 95. • 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 28 pages. ADVICE • Read each question carefully before you start your answer. © OCR 2023 [601/8690/2] DC (CJ/CGW) 326974/4 OCR is an exempt Charity Turn over H You must have: •a ruler (cm/mm) •the Data Sheet for GCSE (9-1) Combined Science (Chemistry) B (inside this document) You can use: •an HB pencil •a scientific or graphical calculator 2 © OCR 2023 Incomplete combustion of fossil fuels 1 The combustion of fossil fuels for energy produces harmful substances. (a) (i) Draw lines to connect each harmful substance with the description of its major source. Harmful substance Major source [2] (ii) Explain one problem caused by increased amounts of sulfur dioxide in the atmosphere. ............................................................................................................................. .............. ............................................................................................................................. .............. ............................................................................................................................. .............. . ................................ ................................ ................................ ................................ .. [2] (iii) Describe one method that is used to decrease the amount of harmful substances put into the atmosphere by petrol cars. ............................................................................................................................. .............. . ................................ ................................ ................................ ................................ .. [1] Carbon monoxide Combustion of sulfur impurities in fossil fuels Nitrogen oxides Oxidation of nitrogen at high temperatures. Sulfur dioxide Particulates 3 Turn over © OCR 2023 BLANK PAGE PLEASE DO NOT WRITE ON THIS PAGE