NANOTECHNOLOGY – PAST PAPER QUESTIONS – CHEMISTRY
(b) Silver particles of size 1 to 100 nanometres (nm) are used to kill bacteria in wound dressings.
(i) Explain what you understand by a nanometre. [1]
(b) (i) 1 *10–9 m or other suitable idea of length, e.g. 1 10–6 mm [1]
(ii) Describe one risk which has been associated with the use of silver particles of this size. [1]
(ii) unknown effects/absorbed through skin/discolour skin/allergic reaction/damage organs [1]
1 Nanoparticles have been widely researched in recent years. Carbon nanotubes are made from
graphite and have a wide range of applications in medicine.
(a) State the size of a nanoparticle. [1]
1 (a) 1–100 nm [1]