Gold nanoparticles are widely used in lateral flow diagnostic tests (such as rapid pregnancy or COVID-19 tests) because of their unique optical properties.
A single gold atom has a diameter of approximately 3.0 × 10-10 m (0.3 nm0.3\text{ nm}0.3 nm).
Which of the following values is a realistic estimate for the diameter of a gold nanoparticle?
3.0×10−11 m3.0 \times 10^{-11}\text{ m}3.0×10−11 m
3.0×10−10 m3.0 \times 10^{-10}\text{ m}3.0×10−10 m
3.0×10−8 m3.0 \times 10^{-8}\text{ m}3.0×10−8 m
3.0×10−4 m3.0 \times 10^{-4}\text{ m}3.0×10−4 m
Practise Edexcel GCSE Chemistry Bulk and surface properties of matter including nanoparticles with exam-style questions for Foundation and Higher tier. 63 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
