Titanium dioxide (TiO2TiO_2TiO2) nanoparticles are widely used in sunscreens due to their exceptional ability to block ultraviolet radiation while remaining transparent on the skin. An engineered cubic nanoparticle of TiO2 TiO_2\,TiO2 has a side length of 25 nm25\text{ nm}25 nm. What is the surface area to volume ratio (SA:VSA:VSA:V) of this cubic nanoparticle in metres−1^{-1}−1 (m−1\text{m}^{-1}m−1), expressed in standard form?
2.4×107 m−12.4 \times 10^7\text{ m}^{-1}2.4×107 m−1
2.4×108 m−12.4 \times 10^8\text{ m}^{-1}2.4×108 m−1
2.4×109 m−12.4 \times 10^9\text{ m}^{-1}2.4×109 m−1
4.0×107 m−14.0 \times 10^7\text{ m}^{-1}4.0×107 m−1
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.
