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OCR 2024 GCSE Combined Science B Twenty First Century Science J260/06: Chemistry (Higher Tier) with Marking Scheme Merged.
OCR 2024 GCSE Combined Science B Twenty First Century Science J260/06: Chemistry (Higher Tier) with Marking Scheme Merged. COMBINED SCIENCE B Oxford Cambridge and RSA Friday 17 May 2024 – Morning GCSE (9–1) Combined Science B (Twenty First Century Science) J260/06 Chemistry (Higher Tier) Time allowed: 1 hour 45 minutes 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 * J H 2 6 0 0 6 * Please write clearly in black ink. Do not write in the barcodes. Centre number First name(s) Last name INSTRUCTIONS Candidate number • 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 24 pages. ADVICE • Read each question carefully before you start your answer. 2 1 (a) Table 1.1 shows the diameters of some particles. Table 1.1 Particle Diameter (m) Carbon atom 1.54 × 10–10 Fullerene molecule 1.10 × 10–9 Silver atom 2.88 × 10–10 Platinum nanoparticle 1.00 × 10–8 (i) Which two particles have diameters with the same order of magnitude? ....................................................................... and ....................................................................... [1] (ii) Write down the particles in order of diameter. Smallest........................................ ........................................ ........................................ Largest........................................ [2] (b) Nanoparticles make effective catalysts because they have a high surface area to volume ratio. Table 1.2 shows the surface area to volume ratio of some different sized particles. Table 1.2 Nanoparticle Particle of Particle of Fine Powder Coarse Powder Size of Particle (nm) 60 600 6000 Surface Area to 0.1 0.01 0.001 Volume Ratio Describe the relationship between the size of a particle and its surface area to volume ratio. .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... ..................................................................................................................................................... [2] © OCR 2024 3 (c) The nanoparticle shown is a cube. This nanoparticle has a volume of 1000 nm3 . h l w NOT TO SCALE Calculate the surface area of the nanoparticle.
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