Some sports socks and wound dressings contain nanoparticles of silver.
Give the property of silver nanoparticles that makes them useful in wound dressings.
State how the size of a nanoparticle compares with the size of an atom.
State what happens to the surface area to volume ratio of a particle as the particle gets smaller.
A silver nanoparticle has a diameter of 60 nm. A silver atom has a diameter of 0.30 nm. Calculate how many times larger the diameter of the nanoparticle is than the diameter of the atom. Use the equation: number of times larger=diameter of nanoparticlediameter of atom\displaystyle \text{number of times larger} = \frac{\text{diameter of nanoparticle}}{\text{diameter of atom}}number of times larger=diameter of atomdiameter of nanoparticle
Silver nanoparticles are washed out of the socks when they are cleaned. Suggest one risk to the environment.
Give one reason why scientists are not yet sure about the risks of nanoparticles.
36 exam-style questions on Edexcel GCSE Chemistry 10.5 Bulk and surface properties of matter including nanoparticles, covering 10.5.1 Nanoparticles: size, uses and risks and 10.5.2 Comparing and selecting materials. Each one has a worked solution and a mark scheme showing where the marks go.