Titanium dioxide nanoparticles are commonly used in sunscreens to block ultraviolet radiation. A typical titanium dioxide nanoparticle has a diameter of 250 nm250 \text{ nm}250 nm.
What is 250 nm250 \text{ nm}250 nm in metres in standard form?
2.5×10−7 m2.5 \times 10^{-7} \text{ m}2.5×10−7 m
2.5×10−8 m2.5 \times 10^{-8} \text{ m}2.5×10−8 m
2.5×10−9 m2.5 \times 10^{-9} \text{ m}2.5×10−9 m
2.5×10−11 m2.5 \times 10^{-11} \text{ m}2.5×10−11 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.
