A cubic titanium dioxide nanoparticle, commonly used in sunscreens due to its high surface area to volume ratio, has a side length of 15 nm15\text{ nm}15 nm.
What is the surface area to volume ratio of this nanoparticle in m−1\text{m}^{-1}m−1?
4.0×10−10 m−14.0 \times 10^{-10}\text{ m}^{-1}4.0×10−10 m−1
4.0×105 m−14.0 \times 10^5\text{ m}^{-1}4.0×105 m−1
6.7×107 m−16.7 \times 10^7\text{ m}^{-1}6.7×107 m−1
4.0×108 m−14.0 \times 10^8\text{ m}^{-1}4.0×108 m−1
48 exam-style questions on OCR GCSE Chemistry Properties of materials. Each one has a worked solution and a mark scheme showing where the marks go.