What size are nanoparticles?
1-100 nm
500-1000 nm
1000-2000 nm
What do nanoparticles have compared to the same material in bulk?
lower density
very large surface to volume ratio
higher melting and boiling point
Which of the following is not a benefit of nanoparticles used in sun creams?
nicer appearance
poorer skin coverage
more effective skin protection
What is the surface area to volume ratio of a cube with side length 2 cm?
1:3
1:2
3:1