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OCR MERGED QUESTION PAPER AND MARK SCHEME GCSE (9–1) Combined Science B(Twenty First Century Science)J260/06 Chemistry (Higher Tier)FOR MAY 2024$11.99
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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
, 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
Particle of Particle of
Nanoparticle
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.
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